Photodegradation of Organophosphorus Pesticides on Magnetically Recyclable Core-Shell Nanocatalyst

IF 0.5 4区化学 Q4 CHEMISTRY, ANALYTICAL Journal of Water Chemistry and Technology Pub Date : 2024-07-31 DOI:10.3103/s1063455x2404009x

Jitendra R. Satam, Shamrao T. Disale

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Abstract

Magnetically recyclable nanoparticle catalysts, in particular, Fe₃O₄, TiO₂@Fe₃O₄, SiO₂@Fe₃O₄, TiO₂–SiO₂@Fe₃O₄ and silver doped TiO₂–SiO₂@Fe₃O₄ (Ag–TiO₂–SiO₂@Fe₃O₄) 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 H₂O₂ 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–TiO₂–SiO₂@Fe₃O₄.

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磁性可回收核壳纳米催化剂对有机磷农药的光降解作用

摘要采用溶胶-凝胶合成法和改良溶胶-凝胶合成法合成了可磁化回收的纳米颗粒催化剂，特别是Fe3O4、TiO2@Fe3O4、SiO2@Fe3O4、TiO2-SiO2@Fe3O4和掺银TiO2-SiO2@Fe3O4（Ag-TiO2-SiO2@Fe3O4）。这些纳米颗粒催化剂由金属盐和氧化烷烃前驱盐制备而成。研究了这些催化剂在降解水中有机磷农药草甘膦和马拉硫磷时的光催化活性。对这些有机化合物在紫外线辐射下的光降解进行了详细研究。使用 TEM（透射电子显微镜）、EDX（能量色散 X 射线）、ICP-AES（电感耦合等离子体原子发射光谱）、XRD（X 射线衍射）和 BET 表面积测量技术对合成的纳米粒子进行了物理化学表征。有机农药的降解反应是在专门设计的光批式反应器中进行的。研究发现，在反应中使用 H2O2 作为氧化剂可提高有机磷农药的降解和矿化催化性能。掺银纳米催化剂在随后的多次运行中表现出较高的回收效率和稳定性。在光降解反应前后，使用去除 COD（化学需氧量）和 HPLC（高效液相色谱法）方法对水的反应过程进行了研究。在使用 Ag-TiO2-SiO2@Fe3O4 处理过的水样中，观察到 COD 降低了 95% 以上。

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来源期刊

Journal of Water Chemistry and Technology CHEMISTRY, APPLIED-CHEMISTRY, ANALYTICAL

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0.00%

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>12 weeks

期刊介绍： Journal of Water Chemistry and Technology focuses on water and wastewater treatment, water pollution monitoring, water purification, and similar topics. The journal publishes original scientific theoretical and experimental articles in the following sections: new developments in the science of water; theoretical principles of water treatment and technology; physical chemistry of water treatment processes; analytical water chemistry; analysis of natural and waste waters; water treatment technology and demineralization of water; biological methods of water treatment; and also solicited critical reviews summarizing the latest findings. The journal welcomes manuscripts from all countries in the English or Ukrainian language. All manuscripts are peer-reviewed.