We have recently published how to remove nanoparticles from waste water . It is difficult at the same time remove both positively and negatively charged AgNPs

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Dr Dmitriy Berillo thank you for your contribution to the discussion

In fact the potential benefits of green chemistry, there are also some challenges and barriers that hinder its adoption and development. These include a lack of awareness and education, incentives and regulations, infrastructure and standards, and collaboration and communication. Major findings reveal the complexity in geographical and seasonal distributions of plants and their compositions that green synthesis is limited by time and place of production as well as issues with low purity and poor yield. The main drawback of this method is the production of nanoparticles with imperfect surface structures. Also, it is an expensive and time consuming approach so it is not appropriate for large-scale production. In addition to uncountable advantages green synthesis method have some challenge's for instance lack of raw material and their specific time to harvest, mature and difficult to access the desired raw materials. This review will explain the potential to use the green synthesis NPs and the challenges face in synthesis. Lack of information, no known alternative chemical or raw material inputs no known alternative process technology, uncertainty about performance. Key advantages of using green chemistry to impact business practices include fewer landfills, cleaner ecosystems, and the production of biodegradable products. Disadvantages include the inability to modify some processes and higher costs associated with research, development, and production. Nanomaterials provide many advantages, such as greater sensitivity, real-time detection, smaller sample sizes, portability, and lower cost in environmental remediation. In addition to metals and metal oxide nanomaterials, nanomembranes have found applications in water treatment. These materials can be useful in remediation and cleaning waste sites. Ferrous NP can be applied for disinfection of heavy metal contaminated water as well as heavy metal-containing soil, additionally being effective eco-friendly fertilizers. Environmental applications of nanotechnology include water and wastewater treatment, in which different nanomaterials utilize adsorption and separation processes, as well as a variety of other approaches, to remove pollutants, pathogens, and other hazardous elements. Nanoparticles can absorb organic and inorganic pollutants from wastewater, which are otherwise difficult to remove. Another advantage of using nanoparticles is that during the manufacturing process, harmful by-products are not released. Fate of nanoparticles in the environment. NP in the environment undergoes ageing processes such as chemical transformation, aggregation, and disaggregation. The interplay between these processes and the NP transport determines the fate and ultimately the ecotoxicological potential of NP.