Nanotechnology is getting more attention in recent times because of ecofriendly, cost-effective and durable materials production. Scientists are focusing on synthesizing different nano-composites using various agro-waste and clay type materials with established synthetic polymers to enhance their properties in terms of adsorptive capacity for wastewater treatment, conductance, and catalytic efficiency. Polymer based materials are extensively used in our daily life in many ways, due to their low price, ecofriendliness, durability, and ease of handling in many ways, such as paints, varnishes, utensils, electronics, conductors, furniture, clothing, ornaments etc. By combining polymers with agro-waste or clay type materials, novel composites were synthesized by various researchers and applied in different fields of industry on a laboratory scale, for adsorptive removal of contaminants, including organic pollutants, heavy metal ions, cationic and anionic dyes from wastewater. They are also used as antimicrobial agents, drug delivery systems, and electronic devices.

Major hurdles in their synthesis are to find compatible materials and their specific ratios to get the desired properties correctly imparted to that specified nano-composite, along with its own desk characterization. Various materials are used in wastewater treatment for producing recycled water that can be used in safer ways. Depending upon the methodology adopted and the availability of indigenous resources, scientists are exploring a variety of natural and synthetic materials for adsorptive and photocatalytic wastewater treatment. These include agro-waste materials like husk, leaves, seeds, peels, branches, various clays, polymers, resins, metal oxides on an individual basis or in the form of composites for enhancing their adsorptive or catalytic efficiencies.

The main aim of this Special Issue is to welcome original and review articles focusing on new synthetic nano-composites, specifically using agro-waste or clay type materials from indigenous resources and their characterization along with applications for adsorptive and catalytic removal of contaminants like dyes, toxic metal ions, pharmaceutical wastes and tannery residues from wastewater.

Potential topics include but are not limited to the following:

• Synthesis of novel nano-composites using agro-waste or clay type materials
• Use of indigenous resources and green technology (solvent-free methods or microwave assisted assembly for their production)
• Metal oxide composites with agro-waste, such as peels, husk, leaves, seeds, bushes or algae, fungi
• On-desk characterization by physical, chemical, and spectroscopic methods
• Use of these novel nano-composites for biosorptive removal of dyes, toxic metal ions, pharmaceutical wastes, organic pollutants, and tannery residues from wastewater
• Study of their catalytic potential for organic pollutants removal from water by photocatalytic reduction
• Comparison of their synthetic processes with conventional methods
• Comparison of removing contaminants efficiency with reported adsorbents and catalysts