ZnO Photocatalysts for the Treatment of Wastewater: History
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Subjects: Biochemical Research Methods
Contributor:
Afzal Shah

The presence of contaminants in wastewater, surface water, groundwater, and drinking water is a serious threat to human and environmental health. Their toxic effects and resistance towards conventional water treatment methods have compelled the scientific community to search for an environmentally friendly method that could efficiently degrade toxic contaminants. In this regard, visible light active photocatalysts have proved to be efficient in eliminating a wide variety of water toxins. A plethora of research activities have been carried out and significant amounts of funds are spent on the monitoring and removal of water contaminants, but relatively little attention has been paid to the degradation of persistent water pollutants. In this regard, nanoparticles of doped ZnO are preferred options owing to their low recombination rate and excellent photocatalytic and antimicrobial activity under irradiation of solar light. 

  • visible light active photocatalyst
  • doped ZnO
  • water contaminants
  • wastewater treatment
  • antimicrobial activity

1. Introduction

Semiconducting nanomaterials have received the utmost attention of researchers owing to their applicability in electronic devices, solar energy harvesting devices, drug delivery, water purification, pharmaceutical industries, biosensors, and ceramics [1][2]. Among nanomaterials, ZnO is of special interest for researchers due to its environmentally benign nature. Its band gap is 3.4 eV and it is commonly doped with elements of group I and V in an attempt to make p-type ZnO for use as a visible light active photocatalyst. The literature survey reveals that oxygen deficient sites, Zn centres, and hydrogen bond ability facilitate electron doping in ZnO [3][4][5][6][7]. Doped zinc oxides are used as visible light active photocatalysts for the degradation of emerging pollutants (EPs), which demand special attention owing to their health hazardous effects.

2. Use of ZnO for the Breakdown of Dyes

Zinc oxide is extensively used for the breakdown of potentially harmful water pollutants. The majority of commonly used water treatment methods such as chemical treatment, adsorption, and membrane filtration are useful, but inadequate for complete removal of pollutants from wastewater [8]. Additionally, these approaches produce by-products such as sludge as solid waste and toxic gases that need further treatment. Therefore, for effective water clean-up, visible light active zinc-oxide-based photocatalysis is receiving special attention. Photocatalysis uses photoexcited charge carriers for the breakdown of organic contaminants. The photoactivity of ZnO is utilized for destroying such water toxins [9].
Shinde et al. [10] investigated two methods of dye degradation. In one method, the transport of electron into CB of photocatalyst occurs by photon having energy equal to or greater than the band gap of nanoparticles. The excited electrons result in the formation of holes in valence band. The generated electrons and holes leads to free radical formation [11]. The oxidation of pigments is triggered by the holes present in the valence band.
                                                             h+VB + dye → dye * → dye degradation
The second method involves dye sensitization, where dye on the water surface absorbs visible radiation. The absorbed photon excites electrons of dye molecules from HOMO to LUMO. The electron present in LUMO shifts to the conduction band of ZnO. On reaction with O2, this electron yields O2−, which causes the breakdown of pollutants present in water. The schematics of both methods can be seen in Figure 1.
/media/item_content/202202/620dbb23a37denanomaterials-12-00486-g005.pngFigure 1. Schematics of the photoexcitation of the dye followed by its photocatalytic degradation under solar irradiation.
T. Bora et al. [12] reported the potential antibacterial activity of ZnO nanorods and their photocatalytic activity towards the breakdown of methylene blue and phenol (Figure 2). The rate constant for photocatalytic breakdown of methylene blue dye and phenol was found to be 0.032 and 0.094 min−1, respectively, at 250 °C. Similarly, ZnO doped with Ag degrades organic dyes by the prevention of hole and electron recombination, which enhances the photocatalytic activity, as expected [13]. The degradation efficiency of ZnO doped with silver was found to be 99.64% against rhodamine B.
/media/item_content/202202/620dbb479ff12nanomaterials-12-00486-g006.pngFigure 2. Mechanism of antibacterial and photocatalytic activity of ZnO nanorods. Adapted with permission from [12]. Copyright 2017, Elsevier.
Kumar et al. [14] also discovered that the photocatalytic activity of ZnO is increased on doping with Ag. Nanoparticles of Ag-ZnO developed with 0.02, 0.04, and 0.06 percent of Ag showed 3.03 eV, 3.01 eV, and 2.96 eV band gaps, respectively. As discussed earlier, doping lowers the energy required to shift an electron from valence band to conduction band [15]. William et al. [16] used Ag-doped ZnO thin film for the degradation of methylene blue. The results of their experiments revealed that silver-doped ZnO degrades dye more effectively (45.1%) than a pure ZnO (2.7%) film under irradiation of VL. In the same area of study, Sabry et al. [17] carried out some modification in Ag-doped ZnO nanostructure by introducing stearic acid for the breakdown of methylene blue and achieved 93% breakdown efficiency after 80 min exposure to visible light. Liu et al. [18] also used doped Ag-ZnO and found it to be effective for the degradation of Congo Red. Figure 3 presents the optical properties of doped ZnO by photoluminescence and UV/Vis absorption spectroscopy. Using the W Xe lamp, Congo Red, Methyl Orange, and Methylene Blue were photocatalytically broken down. A 0.25 M Ag-doped ZnO showed maximum photocatalytic activity of 91.9% in 120 min under a solar light simulator.
/media/item_content/202202/620dbb715f72dnanomaterials-12-00486-g007.pngFigure 3. (a) Room temperature PL spectra of samples synthesized by electrolytes containing different concentrations of Ag+. (b) UV/Vis absorption spectra of bare ZnO and Ag-ZnO submicrometer rods. Adapted with permission from [18]. Copyright 2019, ACS.
Saffari et al. [19] prepared pure ZnO and P-containing ZnO for Rhodamine B degradation. Using a halogen lamp, visible light in the wavelength range of 375–1000 nm was employed. A lowering in the electrons and holes recombination rate in the sample containing 1.8% of phosphorus resulted in complete breakdown of RhB dye in 180 min. Kuriakose et al. [20] applied Cu-doped ZnO for the degradation of methyl orange and methylene blue dyes. Furthermore, 5% Cu doping in ZnO led to 92% and 80% degradation of methylene blue and methyl orange, respectively, in 30 min. Vaiano et al. [21] used ZnO doped with Cu for photocatalytic oxidation of As (III) to As (V). Here, 52% photocatalysis was observed after VL exposure of 180 min for ZnO doped with 1.08% of Cu. Similarly, Kamlesh et al. [22] employed Cu-doped ZnO nanoparticles for methyl green degradation and, under irradiation of VL, noticed a 3.5-fold enhancement in photocatalytic activity against methyl green as compared with undoped ZnO.
Vinodkumar et al. [23] studied the impact of Mg doping on the photocatalytic performance of ZnO. Compared with ZnO, 0.1% MgZnO showed a twofold higher photocatalytic efficiency. Adam et al. [24] also synthesized Mg-doped ZnO nanoparticles and investigated their role for the degradation of methylene blue. ZnO on doping with 0, 3, 5, and 7% of Mg resulted in approximately 55, 65, 77, and 96% decolouration of MB dye, respectively. The improved photocatalytic performance by Mg-doped ZnO can be attributed to the role of Mg in the ZnO lattice that enhances the hydroxyl ions’ absorption at the nanoparticle surface and works as trap sites to increase the photodegradation as well as to lower the electron–hole pair recombination. Adeel et al. [25] investigated ZnO doped with Co to remove methyl orange from wastewater. Figure 4 shows that ZnO doped with 10% Co causes 93% methyl orange degradation. The authors ascribed the increase in photocatalysis to the prevention of electron–hole recombination.
/media/item_content/202202/620dbbc3e80a0nanomaterials-12-00486-g008.pngFigure 4. Photodegradation of methyl orange with pure ZnO and doped ZnO with 5% Co, 10% Co, and 15% Co. Adapted with permission from [25]. Copyright 2019, ACS.
Hernandez et al. [26] compared the photocatalytic efficiency of undoped and Eu doped ZnO. A 99.3% breakdown of methylene blue dye was achieved with doped nanoparticles. Similary, Tb- and Eu-doped ZnO NPs showed 100% photodegradation of methylene blue and facilitated reduction of CO2 and production of H2 [27]. Petronela et al. [28] synthesized Ni-Co codoped ZnO NPs to check their efficiency towards the removal of Rhodamine B dye from contaminated water in the presence of visible light, which was found to be 42% for 0.69% of both of the dopants. Similarly, Shanmugam et al. [29] probed the photocatalysis of ZnO/Cu/Sn nanoparticles and found these to have much better photocatalytic activity towards methylene blue, which was completely degraded in 180 min under visible light irradiation.
Qin et al. [30] observed the ability of ZnO-graphene nanocomposites for the removal of methylene blue from wastewater. High absorptivity of the dye and charge separation process led to enhanced photocatalytic degradation efficiency of the nanocomposites. Ruhullah et al. [31] prepared Mn-doped ZnO and found these to be effective for the breakdown of basic aniline dye and methylene blue dye. In another study, carbon nanotubes supported Mn-doped ZnO NPs efficiently photodegraded >95% malachite green in water under irradation of VL [32]. Similarly, Labhne et al. reported photodegradation of rhodamine B (99% in 140 min) and congo red (100% in 160 min) using Mn-doped ZnO supported with reduced graphene [33]. Maline Ghosh et al. [34] used a bimetallic photocatalyst, which resulted in 90% breakdown of caffeine with a rate constant of 0.024 min−1. Subhan et al. [35] prepared a trimetallic oxide nanocomposite ZnO.CuO.CeO2, which exhibited 97% photocatalytic dye degradation activity. ZnO nanorods doped with Nd and Gd were also reported for methylene blue degradation under illumination of VL. A 1.5% Nd-Gd codoped ZnO resulted in 93% photocatalytic breakdown of MB in 180 min [36]. The photocatalytic efficiency of other doped zinc oxides for the degradation of various dyes can be seen in Table 1 [37][38][39][40][41][42][43][44][45][46]. Thus, it can be concluded that doping increases the photocatalytic characteristics of ZnO nanostructures.
Table 1. Percentage degradation of various dyes using doped ZnO photocatalysts.
Sr. No. Doped ZnO Pollutants % Degradation Light Source References
1. Sn/ZnO Methyl blue dye 81 150 W Xe lamp [37]
2. La/ZnO Methyl orange dye 85.86 Visible light [38]
3. Ir/ZnO Malachite green >90 9 W fluorescent visible lamp [39]
4. Sr/ZnO Methylene blue 50 500 W Xe lamp [40]
5. V/ZnO Malachite green >99 Osram Lumilux daylight lamp [41]
6. Co/ZnO Methylene blue 98 % 500 W halogen lamp [42]
7. Cu/ZnO Direct blue 15 dye 70 Visible light [43]
8. Ag/ZnO Cibacron brilliant yellow 3G-B 65 400 mW·cm−2 Xe lamp [44]
9. Al/ZnO Naphthol green B 100 25 W·cm−2 sunlight [45]
10. Nd/ZnO Congo red 93.7 Visible light [46]

3. Water Disinfection with Visible Light Active ZnO-Based Photocatalysts

Booming industrialization has led to water quality deterioration. Chlorination and ozonization methods are frequently used for disinfecting water. However, these methods are not free from limitations; for example, various carcinogenic by-products are produced during chlorination and ozonization [47][48][49]. Photocatalysts hold great promise for effectively treating contaminated water. Among the photocatalysts, ZnO has received enormous attention as a disinfectant thanks to its stable nature under severe processing environments [50]. Moreover, it does not cause secondary pollution. Its phase composition, particle size distribution, defective surface, and specific surface area play their role in antibacterial/antimicrobial activity. ZnO nanoparticles adopt different ways for their antimicrobial activity, such as release of oxygen species and Zn2+, which can kill microorganisms by damaging their DNA and cell membrane. ZnO also exerts antimicrobial activity when it comes in direct contact with the cell membrane of microbes [50][51][52][53]. Gancheva and colleagues [54] utilized zinc oxide powder for disinfecting water. The azo dye of Malachite Green was removed from water in 180 min using ZnO powder in the presence of visible light during the disinfection procedure. Mahamuni et al. [55] found that ZnO particles had varying degrees of antibiofilm and antibacterial action against Gram-negative and Gram-positive Staphylococcus and Proteus vulagaris. The antibacterial and antibiofilm activity of ZnO nanoparticles was found to vary inversely with particle size. At a concentration of about 50 μg/mL, it inhibited 32.67 percent of Staphylococcus aureus and 22.38 percent of Proteus vulgaris, respectively. The greatest biofilm resistance against Staphylococcus aureus and Proteus was 67.3 percent and 58.18 percent, respectively, for 250 μg/mL concentration of ZnO. In one particular study, Haque et al. [56] reported that ZnO prepared by the biological method degraded methylene blue dye up to 80% in 20 min, compared with 68 percent by ZnO produced by the sol–gel approach. So, according to this study, ZnO prepared by the biosynthetic approach outperforms ZnO prepared via the sol–gel method in terms of water disinfection. Working in this area, Ogunyemi, et al. [57] found the maximum antibacterial activity of ZnO NPs produced via using olive leaves compared with chamomile flower and red tomato fruit. Olea europaea ZnONPs had the maximum inhibitory zone of 2.2 cm at 16.0 μg/mL. The authors attributed this excellent activity to the small crystallite size of ZnO NPs.
Similarly, J. Suresh et al. [89] also synthesized zinc oxide NPs in combination with Costus Pictus D. leaf extracts. Biosynthesized zinc oxide nanoparticles showed greater antimicrobial activity against fungal and bacterial species. The zone of inhibition for B. subtilis, S. aureus, S. paratyphi, and E. coli was found to be 17, 10, 12, and 10 mm, respectively. Inhibition and cell survival were found to increase with the increasing concentration of ZnO nanoparticles. Working in this area, Panchal et al. [90] mixed seed extract from Ocimum tenuiflorum to Ag/ZnO NPs and observed improved antimicrobial activity in comparison with pure NPs and Ag/ZnO. In 15 min, bacteria with a density of 1 × 108 cfu were killed by 1.0% Ag/ZnO nanocomposite.

This entry is adapted from the peer-reviewed paper 10.3390/nano12030486

References

  1. Rahman, B.; Viphavakit, C.; Chitaree, R.; Ghosh, S.; Pathak, A.K.; Verma, S.; Sakda, N. Optical Fiber, Nanomaterial, and THz-Metasurface-Mediated Nano-Biosensors: A Review. Biosensors 2022, 12, 42.
  2. Zafar, N.; Madni, A.; Khalid, A.; Khan, T.; Kousar, R.; Naz, S.S.; Wahid, F. Pharmaceutical and Biomedical Applications of Green Synthesized Metal and Metal Oxide Nanoparticles. Curr. Pharm. Des. 2020, 26, 5844–5865.
  3. Annu, A.A.; Ahmed, S. Green synthesis of metal, metal oxide nanoparticles, and their various applications. Handb. Ecomater. 2018, 1–45.
  4. Musa, I.; Qamhieh, N. Study of optical energy gap and quantum confinement effects in zinc oxide nanoparticles and nanorods. Dig. J. Nanomater. Biostruct. 2019, 14, 119–125.
  5. Kim, K.J.; Kreider, P.B.; Choi, C.; Chang, C.H.; Ahn, H.G. Visible-light-sensitive Na-doped p-type flower-like ZnO photocatalysts synthesized via a continuous flow microreactor. RSC Adv. 2013, 3, 12702–12710.
  6. Fortunato, E.; Gonçalves, A.; Pimentel, A.; Barquinha, P.; Gonçalves, G.; Pereira, L.; Ferreira, I.; Martins, R. Zinc oxide, a multifunctional material: From material to device applications. Appl. Phys. A 2009, 96, 197–205.
  7. Ates, T.; Tatar, C.; Yakuphanoglu, F. Preparation of semiconductor ZnO powders by sol–gel method: Humidity sensors. Sens. Actuators A Phys. 2013, 190, 153–160.
  8. Balcha, A.; Yadav, O.P.; Dey, T. Photocatalytic degradation of methylene blue dye by zinc oxide nanoparticles obtained from precipitation and sol-gel methods. Environ. Sci. Pollut. Res. 2016, 23, 25485–25493.
  9. Irani, M.; Mohammadi, T.; Mohebbi, S. Photocatalytic degradation of methylene blue with ZnO nanoparticles; a joint experimental and theoretical study. J. Mex. Chem. Soc. 2016, 60, 218–225.
  10. Shinde, D.R.; Tambade, P.S.; Chaskar, M.G.; Gadave, K.M. Photocatalytic degradation of dyes in water by analytical reagent grades ZnO, TiO2 and SnO2: A comparative study. Drink. Water Eng. Sci. 2017, 10, 109–117.
  11. Rakibuddin, M.; Ananthakrishnan, R. Novel nano coordination polymer based synthesis of porous ZnO hexagonal nanodisk for higher gas sorption and photocatalytic activities. Appl. Surf. Sci. 2016, 362, 265–273.
  12. Bora, T.; Sathe, P.; Laxman, K.; Dobretsov, S.; Dutta, J. Defect engineered visible light active ZnO nanorods for photocatalytic treatment of water. Catal. Today 2017, 284, 11–18.
  13. Yang, X.; Qiu, L.; Luo, X. ZIF-8 derived Ag-doped ZnO photocatalyst with enhanced photocatalytic activity. RSC Adv. 2018, 8, 4890–4894.
  14. Kumar, S.; Singh, V.; Tanwar, A. Structural, morphological, optical and photocatalytic properties of Ag-doped ZnO nanoparticles. J. Mater. Sci. Mater. Electron. 2016, 27, 2166–2173.
  15. Ashebir, M.E.; Tesfamariam, G.M.; Nigussie, G.Y.; Gebreab, T.W. Structural, optical, and photocatalytic activities of Ag-doped and Mn-doped ZnO nanoparticles. J. Nanomater. 2018, 2018, 9425938.
  16. Vallejo, W.; Cantillo, A.; Díaz-Uribe, C. Methylene blue photodegradation under visible irradiation on Ag-Doped ZnO thin films. Int. J. Photoenergy 2020, 2020, 1627498.
  17. Sabry, R.S.; Rahmah, M.I.; Aziz, W.J. A systematic study to evaluate effects of stearic acid on superhydrophobicity and photocatalytic properties of Ag-doped ZnO nanostructures. J. Mater. Sci. Mater. Electron. 2020, 31, 13382–13391.
  18. Liu, J.; Li, J.; Wei, F.; Zhao, X.; Su, Y.; Han, X. Ag–ZnO submicrometer rod arrays for high-efficiency photocatalytic degradation of Congo red and disinfection. ACS Sustain. Chem. Eng. 2019, 7, 11258–11266.
  19. Saffari, R.; Shariatinia, Z.; Jourshabani, M. Synthesis and photocatalytic degradation activities of phosphorus containing ZnO microparticles under visible light irradiation for water treatment applications. Environ. Pollut. 2020, 259, 113902.
  20. Kuriakose, S.; Satpati, B.; Mohapatra, S. Highly efficient photocatalytic degradation of organic dyes by Cu doped ZnO nanostructures. Phys. Chem. Chem. Phys. 2015, 17, 25172–25181.
  21. Vaiano, V.; Iervolino, G.; Rizzo, L. Cu-doped ZnO as efficient photocatalyst for the oxidation of arsenite to arsenate under visible light. Appl. Catal. B Environ. 2018, 238, 471–479.
  22. Chandekar, K.V.; Shkir, M.; Al-Shehri, B.M.; AlFaify, S.; Halor, R.G.; Khan, A.; Al-Namshah, K.S.; Hamdy, M.S. Visible light sensitive Cu doped ZnO: Facile synthesis, characterization and high photocatalytic response. Mater. Charact. 2020, 165, 110387.
  23. Etacheri, V.; Roshan, R.; Kumar, V. Mg-doped ZnO nanoparticles for efficient sunlight-driven photocatalysis. ACS Appl. Mater. Interfaces 2012, 4, 2717–2725.
  24. Adam, R.E.; Alnoor, H.; Pozina, G.; Liu, X.; Willander, M.; Nur, O. Synthesis of Mg-doped ZnO NPs via a chemical low-temperature method and investigation of the efficient photocatalytic activity for the degradation of dyes under solar light. Solid State Sci. 2020, 99, 106053.
  25. Adeel, M.; Saeed, M.; Khan, I.; Muneer, M.; Akram, N. Synthesis and characterization of Co–ZnO and evaluation of its photocatalytic activity for photodegradation of methyl orange. ACS Omega 2021, 6, 1426–1435.
  26. Hernández-Carrillo, M.; Torres-Ricárdez, R.; García-Mendoza, M.; Ramírez-Morales, E.; Rojas-Blanco, L.; Díaz-Flores, L.; Sepúlveda-Palacios, G.; Paraguay-Delgado, F.; Pérez-Hernández, G. Eu-modified ZnO nanoparticles for applications in photocatalysis. Catal. Today 2020, 349, 191–197.
  27. Ahmad, I.; Akhtar, M.S.; Ahmed, E.; Ahmad, M.; Keller, V.; Khan, W.Q.; Khalid, N. Rare earth co-doped ZnO photocatalysts: Solution combustion synthesis and environmental applications. Sep. Purif. Technol. 2020, 237, 116328.
  28. Pascariu, P.; Tudose, I.V.; Suchea, M.; Koudoumas, E.; Fifere, N.; Airinei, A. Preparation and characterization of Ni, Co doped ZnO nanoparticles for photocatalytic applications. Appl. Surf. Sci. 2018, 448, 481–488.
  29. Shanmugam, V.; Jeyaperumal, K.S. Investigations of visible light driven Sn and Cu doped ZnO hybrid nanoparticles for photocatalytic performance and antibacterial activity. Appl. Surf. Sci. 2018, 449, 617–630.
  30. Qin, J.; Zhang, X.; Yang, C.; Cao, M.; Ma, M.; Liu, R. ZnO microspheres-reduced graphene oxide nanocomposite for photocatalytic degradation of methylene blue dye. Appl. Surf. Sci. 2017, 392, 196–203.
  31. Ullah, R.; Dutta, J. Photocatalytic degradation of organic dyes with manganese-doped ZnO nanoparticles. J. Hazard. Mater. 2008, 156, 194–200.
  32. Mohamed, R.; Shawky, A. CNT supported Mn-doped ZnO nanoparticles: Simple synthesis and improved photocatalytic activity for degradation of malachite green dye under visible light. Appl. Nanosci. 2018, 8, 1179–1188.
  33. Labhane, P.; Patle, L.; Sonawane, G.; Sonawane, S. Fabrication of ternary Mn doped ZnO nanoparticles grafted on reduced graphene oxide (RGO) sheet as an efficient solar light driven photocatalyst. Chem. Phys. Lett. 2018, 710, 70–77.
  34. Ghosh, M.; Manoli, K.; Shen, X.; Wang, J.; Ray, A.K. Solar photocatalytic degradation of caffeine with titanium dioxide and zinc oxide nanoparticles. J. Photochem. Photobiol. A Chem. 2019, 377, 1–7.
  35. Subhan, M.A.; Uddin, N.; Sarker, P.; Azad, A.K.; Begum, K. Photoluminescence, photocatalytic and antibacterial activities of CeO2· CuO· ZnO nanocomposite fabricated by co-precipitation method. Spectrochim. Acta Part A Mol. Biomol. Spectrosc. 2015, 149, 839–850.
  36. Akhtar, J.; Tahir, M.; Sagir, M.; Bamufleh, H.S. Improved photocatalytic performance of Gd and Nd co-doped ZnO nanorods for the degradation of methylene blue. Ceram. Int. 2020, 46, 11955–11961.
  37. Arshad, M.; Qayyum, A.; Abbas, G.; Haider, R.; Iqbal, M.; Nazir, A. Influence of different solvents on portrayal and photocatalytic activity of tin-doped zinc oxide nanoparticles. J. Mol. Liq. 2018, 260, 272–278.
  38. Nguyen, L.T.; Nguyen, L.T.; Duong, A.T.; Nguyen, B.D.; Hai, N.Q.; Chu, V.H.; Nguyen, T.D.; Bach, L.G. Preparation, characterization and photocatalytic activity of La-doped zinc oxide nanoparticles. Materials 2019, 12, 1195.
  39. Babajani, N.; Jamshidi, S. Investigation of photocatalytic malachite green degradation by iridium doped zinc oxide nanoparticles: Application of response surface methodology. J. Alloy. Compd. 2019, 782, 533–544.
  40. Yousefi, R.; Jamali-Sheini, F.; Cheraghizade, M.; Khosravi-Gandomani, S.; Saáaedi, A.; Huang, N.M.; Basirun, W.J.; Azarang, M. Enhanced visible-light photocatalytic activity of strontium-doped zinc oxide nanoparticles. Mater. Sci. Semicond. Processing 2015, 32, 152–159.
  41. Khezami, L.; Taha, K.K.; Ghiloufi, I.; El Mir, L. Adsorption and photocatalytic degradation of malachite green by vanadium doped zinc oxide nanoparticles. Water Sci. Technol. 2016, 73, 881–889.
  42. Goswami, M. Enhancement of photocatalytic activity of synthesized Cobalt doped Zinc Oxide nanoparticles under visible light irradiation. Opt. Mater. 2020, 109, 110400.
  43. Ebrahimi, R.; Hossienzadeh, K.; Maleki, A.; Ghanbari, R.; Rezaee, R.; Safari, M.; Shahmoradi, B.; Daraei, H.; Jafari, A.; Yetilmezsoy, K. Effects of doping zinc oxide nanoparticles with transition metals (Ag, Cu, Mn) on photocatalytic degradation of Direct Blue 15 dye under UV and visible light irradiation. J. Environ. Health Sci. Eng. 2019, 17, 479–492.
  44. Alshamsi, H.A.H.; Hussein, B.S. Hydrothermal Preparation of Silver Doping Zinc Oxide Nanoparticles: Study the Characterization and Photocatalytic Activity. Orient. J. Chem. 2018, 34, 1898.
  45. Saber, O.; El-Brolossy, T.A.; Al Jaafari, A.A. Improvement of photocatalytic degradation of naphthol green B under solar light using aluminum doping of zinc oxide nanoparticles. Water Air Soil Pollut. 2012, 223, 4615–4626.
  46. Zhang, J.; Deng, S.; Liu, S.; Chen, J.; Han, B.; Wang, Y.; Wang, Y. Preparation and photocatalytic activity of Nd doped ZnO nanoparticles. Mater. Technol. 2014, 29, 262–268.
  47. Ibrahim, M.M.; Asal, S. Physicochemical and photocatalytic studies of Ln3+-ZnO for water disinfection and wastewater treatment applications. J. Mol. Struct. 2017, 1149, 404–413.
  48. Yi, G.; Yuan, Y.; Li, X.; Zhang, Y. ZnO Nanopillar Coated Surfaces with Substrate-Dependent Superbactericidal Property. Small 2018, 14, 1703159.
  49. Rahman, A.H.; Misra, A.J.; Das, S.; Das, B.; Jayabalan, R.; Suar, M.; Mishra, A.; Tamhankar, A.J.; Lundborg, C.S.; Tripathy, S.K. Mechanistic insight into the disinfection of Salmonella sp. by sun-light assisted sonophotocatalysis using doped ZnO nanoparticles. Chem. Eng. J. 2018, 336, 476–488.
  50. Dimapilis, E.A.S.; Hsu, C.-S.; Mendoza, R.M.O.; Lu, M.-C. Zinc oxide nanoparticles for water disinfection. Sustain. Environ. Res. 2018, 28, 47–56.
  51. Sultana, K.A.; Islam, M.T.; Silva, J.A.; Turley, R.S.; Hernandez-Viezcas, J.A.; Gardea-Torresdey, J.L.; Noveron, J.C. Sustainable synthesis of zinc oxide nanoparticles for photocatalytic degradation of organic pollutant and generation of hydroxyl radical. J. Mol. Liq. 2020, 307, 112931.
  52. Rambabu, K.; Bharath, G.; Banat, F.; Show, P.L. Green synthesis of zinc oxide nanoparticles using Phoenix dactylifera waste as bioreductant for effective dye degradation and antibacterial performance in wastewater treatment. J. Hazard. Mater. 2021, 402, 123560.
  53. Phan, D.-N.; Rebia, R.A.; Saito, Y.; Kharaghani, D.; Khatri, M.; Tanaka, T.; Lee, H.; Kim, I.-S. Zinc oxide nanoparticles attached to polyacrylonitrile nanofibers with hinokitiol as gluing agent for synergistic antibacterial activities and effective dye removal. J. Ind. Eng. Chem. 2020, 85, 258–268.
  54. Gancheva, M.; Markova-Velichkova, M.; Atanasova, G.; Kovacheva, D.; Uzunov, I.; Cukeva, R. Design and photocatalytic activity of nanosized zinc oxides. Appl. Surf. Sci. 2016, 368, 258–266.
  55. Mahamuni, P.P.; Patil, P.M.; Dhanavade, M.J.; Badiger, M.V.; Shadija, P.G.; Lokhande, A.C.; Bohara, R.A. Synthesis and characterization of zinc oxide nanoparticles by using polyol chemistry for their antimicrobial and antibiofilm activity. Biochem. Biophys. Rep. 2019, 17, 71–80.
  56. Haque, M.J.; Bellah, M.M.; Hassan, M.R.; Rahman, S. Synthesis of ZnO nanoparticles by two different methods & comparison of their structural, antibacterial, photocatalytic and optical properties. Nano Express 2020, 1, 010007.
  57. Ogunyemi, S.O.; Abdallah, Y.; Zhang, M.; Fouad, H.; Hong, X.; Ibrahim, E.; Masum, M.M.I.; Hossain, A.; Mo, J.; Li, B. Green synthesis of zinc oxide nanoparticles using different plant extracts and their antibacterial activity against Xanthomonas oryzae pv. oryzae, Artificial cells. Nanomed. Biotechnol. 2019, 47, 341–352.
  58. Suresh, J.; Pradheesh, G.; Alexramani, V.; Sundrarajan, M.; Hong, S.I. Green synthesis and characterization of zinc oxide nanoparticle using insulin plant (Costus pictus D. Don) and investigation of its antimicrobial as well as anticancer activities. Adv. Nat. Sci. Nanosci. Nanotechnol. 2018, 9, 015008.
  59. Panchal, P.; Paul, D.R.; Sharma, A.; Choudhary, P.; Meena, P.; Nehra, S. Biogenic mediated Ag/ZnO nanocomposites for photocatalytic and antibacterial activities towards disinfection of water. J. Colloid Interface Sci. 2020, 563, 370–380.
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