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Topic Review
Platinum Group Elements Geochemistry and Mineralogy
Platinum (Pt), palladium (Pd), rhodium (Rh), iridium (Ir), ruthenium (Ru) and osmium (Os) are known as the platinum group elements (PGE). These metals are characterized by peculiar physical and chemical properties, such as high melting points, resistance to oxidation and corrosion, strong conductivity and ductility. 
  • 1.3K
  • 21 Dec 2022
Topic Review
Plastics in Agricultural Soils
Plastics, especially microplastics, are a diverse group of polymer-based particles, currently emerging as a global environmental threat—plastic pollution. 
  • 251
  • 18 Oct 2023
Topic Review Video
Plastic Waste Governance in Bangladesh
Plastic, an offer of modernity, is presenting a massive threat in altered forms, to our health and environment. Plastic does not only pollute the surface environment, fresh water, and marine ecosystems, but toxic elements released from plastics also percolate down the surface and contaminate groundwater, which we often use as ‘safe’ drinking water. This probable future risk is deeply rooted in the entire governance infrastructure of plastic waste which could potentially lead to contamination of groundwater. A recent study finds 81% of tap water samples collected worldwide contained plastic pollutants, which means that annually we may be ingesting between 3000 and 4000 microparticles of plastic from tap water.
  • 3.1K
  • 04 Mar 2022
Topic Review
Plastic Sand as a Construction Material
Plastic waste pollution poses a serious environmental concern. At the same time, the cement industry is among the biggest sources of CO2 emissions, which poses another environmental challenge. Plastic sand bricks could be a workable solution for combating issues related to solid waste. The compressive strength decreased with increasing ratios of plastic to sand. Plastic sand bricks weighed less than the conventional bricks.
  • 8.0K
  • 10 Jun 2022
Topic Review
Plastic Pollution
Plastic is a word that initially meant “material that can be easily shaped, formed, molded by providing heat and pressure”. It only recently became a name for a category of materials called synthetic polymers. The polymer means “of many parts” and is a long chain of repeating smaller or larger molecules (monomers) bonded in subunits. Generally, natural polymers and synthetic polymers are used for making plastics. Synthetic polymers differ from natural polymers (such as silk, cellulose, muscle fiber, rubber, hair, and DNA). They are manufactured using raw materials such as oil, coal, and natural gas. There are two other types of plastics that do not fall into the above category of materials (natural or synthetic) and are known as biodegradable plastics and bioplastic materials. Biodegradable plastic is made from petroleum- or biomass-based resources. Bioplastic products are manufactured using biomass-based materials only. Both plastic materials are substitutes for synthetic plastic. 
  • 204
  • 11 Mar 2024
Topic Review
Plastic Packaging Recycling
Today, the scientific community is facing crucial challenges in delivering a healthier world for future generations. Among these, the quest for circular and sustainable approaches for plastic recycling is one of the most demanding for several reasons. Indeed, the massive use of plastic materials over the last century has generated large amounts of long-lasting waste, which, for much time, has not been object of adequate recovery and disposal politics. Most of this waste is generated by packaging materials. Nevertheless, in the last decade, a new trend imposed by environmental concerns brought this topic under the magnifying glass, as testified by the increasing number of related publications. Several methods have been proposed for the recycling of polymeric plastic materials based on chemical or mechanical methods. A panorama of the most promising studies related to the recycling of polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), and polystyrene (PS) is given within this review. 
  • 2.2K
  • 16 Sep 2021
Topic Review
Plastic Food Packaging: Consumer Perspective
The use of plastics for packaging has some advantages, since they are flexible and inexpensive. However, most plastics are of single use, which, combined with low recycling or reuse ratios, contributes substantially to environmental pollution. This work is part of a project studying the habits of Portuguese citizens concerning plastic food packaging and focuses on aspects related to sustainability. The survey was carried out via an online questionnaire about sustainability, recycling, and knowledge of the effects of plastic materials or their residues on the environment. The results were obtained based on a statistical analysis of the data. The participants tend to think about the negative impact of plastic packages on the environment; 39% sometimes do not buy plastic; and 30% try to look for alternatives. A substantial fraction, 81%, support the avoidance of plastic utensils and reduction in the use of plastic bags. Most participants have a good knowledge of recycling and strongly agree with the use of recycled materials, and 87% of respondents practice separation of different types of waste for recycling. Changing plastic consumption habits has not been an easy task. Nevertheless, it is expected that society will increasingly move toward sustainable habits, questioning its actions and considering their impact on the environment.
  • 1.2K
  • 13 Sep 2021
Topic Review
Plastic Bag Restricting Law
With the severe plastic pollution issue worldwide, restrictions or bans on plastic bags have become the most popular policy intervention. As essential participants in reducing plastic consumption, residents and enterprises are vital in implementing the plastic bag restriction law (PBRL). 
  • 533
  • 05 Jul 2022
Topic Review
Plasmon-Assisted Molecular Catalysis
The utilization of plasmonic nanomaterials in catalytic technologies is an emerging research field with foreseeable applications in energy-catalytic technologies. On this front, the coupling of plasmonic nanomaterials with molecular catalysts is a newly approached, thus far unexploited field.
  • 144
  • 11 Jan 2024
Topic Review
Plasmid-Mediated Transfer of Antibiotic Resistance Genes in Soil
Due to selective pressure from the widespread use of antibiotics, antibiotic resistance genes (ARGs) are found in human hosts, plants, and animals and virtually all natural environments. Their migration and transmission in different environmental media are often more harmful than antibiotics themselves. ARGs mainly move between different microorganisms through a variety of mobile genetic elements (MGEs), such as plasmids and phages. The soil environment is regarded as the most microbially active biosphere on the Earth’s surface and is closely related to human activities. With the increase in human activity, soils are becoming increasingly contaminated with antibiotics and ARGs. Soil plasmids play an important role in this process.
  • 432
  • 26 Apr 2022
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