The need for sustainable and environmentally friendly wastewater treatment technologies has become critical in addressing global environmental challenges and supporting industrial growth. Globally, approximately 359 billion cubic meters of wastewater are generated annually, with only about 56% undergoing proper treatment. Meanwhile, industrial wastewater contributes significantly to pollution, with estimates suggesting that up to 80% of wastewater worldwide is discharged untreated into the environment. This Collection, Green Solutions for Wastewater Treatment, focuses on cutting-edge approaches and advanced methodologies that emphasize environmental sustainability, resource recovery, and energy efficiency.

Topics of interest include, but are not limited to:

• Developing eco-friendly adsorbents, catalysts, and membranes for wastewater treatment, with adsorption efficiencies exceeding 90% for heavy metals and dyes.

• Bioremediation strategies leveraging microbial consortia capable of reducing pollutant levels by up to 95%, including nitrogen, phosphorus, and organic compounds.

• Green chemistry principles in designing treatment processes for industrial, municipal, and agricultural wastewater, targeting 30-50% reductions in energy consumption compared to conventional methods.

• Advanced oxidation processes (AOPs) capable of achieving 99% degradation of organic pollutants under optimized conditions.

• Circular economy approaches for resource recovery, enabling recovery rates of up to 85% for valuable nutrients like nitrogen and phosphorus, or energy generation efficiencies of 30-40% through anaerobic digestion.

• Applications of coatings, composites, and nanomaterials with long-term stability and contaminant removal efficiencies exceeding 98% for specific pollutants.

• Nanotechnology-based solutions for improved adsorption, filtration, and catalytic degradation, achieving surface area enhancements of over 500 m²/g for advanced adsorbents.

This Collection invites original research articles, comprehensive reviews, and case studies demonstrating scalable, cost-effective, innovative green solutions. Contributions that explore interdisciplinary applications of coatings, composites, and nanomaterials in wastewater treatment are particularly encouraged, bridging the gap between chemical engineering, material science, and environmental sustainability to pave the way for cleaner water and a healthier planet.

This Collection supports and amplifies research related to SDG 6: Clean Water and Sanitation.

Keywords: Advanced oxidation processes (AOPs); Bioremediation; Catalysts for wastewater treatment; Circular economy; Coatings for water purification; Composites for contaminant removal; Eco-friendly adsorbents; Environmental sustainability; Fouling resistance; Green wastewater treatment; Hybrid nanostructures; Industrial and municipal wastewater; Membrane technology; Nanomaterials in wastewater treatment; Polymer-based solutions; Resource recovery; Sustainable technologies; Techno-economic analysis; Water-energy nexus.

The Advances in Green Polymers collection aims to capture the rapid, interdisciplinary developments at the intersection of polymer science, sustainable chemistry, and chemical engineering. The global imperative for sustainability and decarbonization is driving a massive shift away from conventional, fossil-fuel-derived polymers. Green polymers represent a critical solution, offering materials that are environmentally benign throughout their lifecycle—from synthesis and application to eventual disposal or recycling. This field is essential to achieving a circular economy and reducing the environmental footprint of plastics and other materials across sectors ranging from packaging and textiles to electronics and biomedicine. Original research, reviews, and perspectives that address significant scientific and engineering challenges in the following, but not limited to, areas: Sustainable Polymer Synthesis, Biodegradable and Compostable Materials, Polymer Upcycling and Reprocessing, Mechanical and Physical Recycling, Value-Added Applications (upcycling), Structure-Property Relationships and Applications, High-Performance Bioplastics, Functional Green Materials, sustainable electronics, green coatings, and biomedical devices.

Keywords: Green Polymers, biomaterials, bio-based Polymers, Renewable Resources, Biodegradable Polymers, Compostable Materials, Polymer Upcycling, Mechanical Recycling, Poly(lactic acid) (PLA), Cellulose Derivatives, Lignin-based Materials