Photodegradation of Organophosphorus Pesticides on Magnetically Recyclable Core-Shell Nanocatalyst

• Published in: Journal of water chemistry and technology Vol. 46; no. 4; pp. 331 - 338
• Main Authors: Satam, Jitendra R, Disale, Shamrao T
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.08.2024; Springer Nature B.V
• Subjects: Aquatic Pollution; Batch reactors; Catalysts; Catalytic activity; Chemical oxygen demand; Chemical reactions; Chemical synthesis; Chromatography; Earth and Environmental Science; Electron microscopy; Emission spectroscopy; Environment; Gels; Glyphosate; Heavy metals; High performance liquid chromatography; HPLC; Hydrogen peroxide; Inductively coupled plasma; Industrial Chemistry/Chemical Engineering; Iron oxides; Liquid chromatography; Malathion; Measurement techniques; Mineralization; Nanocatalysis; Nanoparticles; Organic compounds; Organic pesticides; Organophosphorus pesticides; Oxidants; Oxidizing agents; Oxygen requirement; Performance degradation; Pesticides; Photocatalysis; Photodegradation; Physical Chemistry of Water Treatment Processes; Salts; Silica; Silicon dioxide; Silver; Sol-gel processes; Spectroscopy; Titanium dioxide; Transmission electron microscopy; Treated water; Ultraviolet radiation; Waste Water Technology; Water analysis; Water Industry/Water Technologies; Water Management; Water Pollution Control; Water Quality/Water Pollution; Water sampling; X rays; X-ray diffraction; magnetic; nanoparticles; photodegradation; pesticides; core-shell
• ISSN: 1063-455X; 1934-936X
• DOI: 10.3103/S1063455X2404009X

Magnetically recyclable nanoparticle catalysts, in particular, Fe 3 O 4 , TiO 2 @Fe 3 O 4 , SiO 2 @Fe 3 O 4 , TiO 2 –SiO 2 @Fe 3 O 4 and silver doped TiO 2 –SiO 2 @Fe 3 O 4 (Ag–TiO 2 –SiO 2 @Fe 3 O 4 ) were synthesized by sol-gel and modified sol-gel synthesis methods. These nanoparticle catalysts were prepared from metal salts and alkoxide precursor salts. Photocatalytic activity of these catalysts was studied in the degradation of organophosphorus pesticides Glyphosate, and Malathion in water. A detailed study of photodegradation of these organic compounds under UV radiation was performed. The physicochemical characterization of the synthesized nanoparticles was performed using TEM (Transmission electron microscopy), EDX (energy dispersive X-ray), ICP-AES (inductively coupled plasma−atomic emission spectroscopy), XRD (X-ray diffraction) and BET surface area measurement techniques. The degradation reactions of organic pesticides were performed in a specially designed photo-batch reactor. The use of H 2 O 2 as an oxidant in the reaction was found to enhance the catalytic performance towards degradation and subsequent mineralization of the organophosphorus pesticides. Silver-doped nanocatalyst exhibits high recycling efficiency and stability over several subsequent runs. The course of the reactions was studied using COD (chemical oxygen demand) removal and HPLC (high-performance liquid chromatography) methods of water before and after the photodegradation reactions. More than 95% reduction in the COD was observed in the treated water sample using Ag–TiO 2 –SiO 2 @Fe 3 O 4 .