Department of Chemistry, National Institute of Technology Silchar, 788010, Assam, India.
Department of Chemistry, National Institute of Technology Silchar, 788010, Assam, India.
Chemosphere. 2024 Jul;359:142343. doi: 10.1016/j.chemosphere.2024.142343. Epub 2024 May 14.
The current research highlights the fabrication of a novel SnS/CO@Ni-Co LDH (SnS/NCL) by precipitating Ni-Co LDH over hydrothermally synthesized SnS nanoparticles for the enhanced degradation of thiamethoxam (THM) insecticide through the advanced oxidation process. The effect of several reaction parameters was optimized, and a maximum degradation of 98.1 ± 1.2 % with a rate constant of 0.0541 min of 10 ppm THM was reached at a catalyst loading of 0.16 gL using 0.3 mM of HO within 70 min of visible light irradiation. The effect of metal cations, inorganic anions, dissolved organic matter, organic compounds and water samples on the photodegradation performance of SnS/NCL nanocomposite was also examined to evaluate the prepared photocatalyst's suitability for use in actual wastewater conditions. The metal cations blocked the active sites of the photocatalyst and reduced the degradation efficiency except for Fe ions, since it is a Fenton reagent and increased the production of hydroxyl radicals. Inorganic anions are the scavengers of hydroxyl radicals and hinder photocatalytic activity. Meanwhile, lake water containing varying degrees of co-existing ions shows the lowest degradation efficiency among other water samples. The SnS/NCL nanocomposite could be reused for five cycles while maintaining a photocatalytic efficiency of 83.6 ± 0.3 % in the fifth run. The prepared SnS/NCL nanocomposite also showed excellent photodegradation of several other emerging organic pollutants with an efficiency of over 80 % under optimum conditions. Incorporating Ni-Co LDH with SnS helped to delocalize photoinduced charges, leading to increased photocatalytic activity and a slower electron-hole recombination rate. The present research highlights the photocatalytic activity of SnS/NCL photocatalysts for the photocatalytic degradation of emerging contaminants from wastewater.
目前的研究强调了一种新型 SnS/CO@Ni-Co LDH（SnS/NCL）的制备方法，即将 Ni-Co LDH 沉淀在水热合成的 SnS 纳米粒子上，以通过高级氧化过程增强噻虫嗪（THM）杀虫剂的降解。优化了几种反应参数的影响，在可见光照射 70 分钟内，催化剂用量为 0.16 g/L 时，HO 用量为 0.3 mM，达到了 10 ppm THM 的最大降解 98.1 ± 1.2%，速率常数为 0.0541 min -1 。还研究了金属阳离子、无机阴离子、溶解有机物、有机化合物和水样对 SnS/NCL 纳米复合材料光降解性能的影响，以评估所制备的光催化剂在实际废水条件下的适用性。金属阳离子会堵塞光催化剂的活性位点，降低降解效率，除了 Fe 离子，因为它是一种芬顿试剂，会增加羟基自由基的产生。无机阴离子是羟基自由基的清除剂，会阻碍光催化活性。同时，含有不同程度共存离子的湖水在其他水样中显示出最低的降解效率。SnS/NCL 纳米复合材料在第五次运行时可重复使用五次，保持 83.6 ± 0.3%的光催化效率。在最佳条件下，制备的 SnS/NCL 纳米复合材料还表现出对几种其他新兴有机污染物的优异光降解效率，超过 80%。将 Ni-Co LDH 与 SnS 结合有助于使光生电荷离域，从而提高光催化活性和较慢的电子-空穴复合率。本研究强调了 SnS/NCL 光催化剂在废水处理中对新兴污染物的光催化降解的光催化活性。
