Gold Silver Nanoparticle Adsorbent for Pesticide Removal

The patent uses composite materials by combining bare metal nanoparticles (silver, gold, iron, palladium) with porous substrates (alumina, silica, activated carbon). This composite structure maintains the high catalytic activity of the metal nanoparticles for pesticide degradation while using the porous substrate to provide mechanical support, increase surface area, and facilitate easy separation and system integration, thus reducing overall system complexity.

The porous substrate acts as an intermediary carrier that supports the metal nanoparticles. This intermediary structure allows the nanoparticles to maintain their catalytic function while being easily separated from the water stream through filtration mechanisms, simplifying system operation and reducing complexity compared to using nanoparticles alone.

The patent employs inexpensive metal nanoparticles (particularly iron and palladium on carbon) that can be easily manufactured and replaced. These nanoparticles serve as effective catalysts for degrading halogenated organic pollutants and can be regenerated or replaced at low cost, simplifying the manufacturing process compared to using precious metals alone.

The patent modifies the physical and chemical parameters of iron particles by creating nanoscale structures and combining them with carbon supports. This parameter change (reducing size to nanoscale and adding carbon coating) dramatically improves the degradation capability of halogenated organics while maintaining ease of manufacture through standard nanoparticle synthesis methods.

The patent creates composite materials by combining carbon-based adsorbents (activated carbon, carbon blocks) with metal nanoparticles (silver, gold, iron, palladium). This composite structure leverages the high adsorption capacity of carbon materials for diverse pesticides while the metal nanoparticles provide catalytic degradation pathways, together achieving both effective removal and broad adaptability across different pesticide types.

The composite system achieves universality by combining materials with different functions: carbon materials provide general adsorption for diverse pesticides, while metal nanoparticles provide catalytic degradation for various chemical structures. This multi-functional approach enables the system to effectively handle a wide range of pesticide contaminants that would be difficult to address with a single material type.