Key Laboratory for Palygorskite Science and Applied Technology of Jiangsu Province, National & Local Joint Engineering Research Centre for Deep Utilization Technology of Rock-salt Resource, Faculty of Chemical Engineering, Huaiyin Institute of Technology, Huai'an, 223003, China.
Institute of Chemical Sciences, University of Peshawar, Khyber Pakhtunkhwa, 25120, Pakistan.
Environ Res. 2022 Oct;213:113722. doi: 10.1016/j.envres.2022.113722. Epub 2022 Jun 18.
Employing dyes in different industrial sectors has produced a serious threat to the environment and living organisms of water bodies and land. For the decontamination of such toxic dyes, efforts have been made to develop an efficient, feasible, and low maintenance processes. In this context, chitosan-zinc selenide (CS-ZnSe) nanoparticles were prepared through chemical reduction method as the efficient photocatalysts for the decontamination of toxic dyes through photocatalysis. Photocatalyst's synthesis was confirmed with the help of FTIR spectroscopy. XRD indicated the hexagonal crystal structure of the CS-ZnSe with a crystallite size of 12 nm. SEM micrographs showed the average nano photocatalyst size as 25 nm. EDX analysis was employed to determine the elemental composition of the CS-ZnSe. An excellent photocatalytic degradation efficiency for tartrazine and sunset yellow dyes was obtained using CS-ZnSe. The results showed a 98% and 97% degradation efficiency for tartrazine dye and sunset yellow (SY) dye at optimized conditions of time (3 h), pH (5), dye concentration (30 ppm), catalyst dosage (0.09 g and 0.01 g) , and at a temperature of 35 °C. Findings of the photocatalytic degradation process fitted well with first-order kinetics for both the dyes. Rate constant, 'K' value was found to be 0.001362 min and 0.001257 min for tartrazine and SY dyes, respectively. While value for (correlation coefficient, R) was 0.99307 and 0.99277 for tartrazine and sunset yellow dyes, respectively. Recyclability of the photocatalyst was confirmed using it for consecutive cycles to degrade organic dyes. Results showed that the CH-ZnS possesses excellent efficiency in decontaminating organic dyes from industrial wastewater.
在不同的工业领域使用染料对水体和陆地的环境和生物造成了严重威胁。为了去除这些有毒染料，人们努力开发高效、可行且低维护的处理方法。在这种情况下，通过化学还原法制备了壳聚糖-锌硒（CS-ZnSe）纳米粒子作为高效光催化剂，通过光催化来去除有毒染料。通过傅里叶变换红外光谱（FTIR）对光催化剂的合成进行了确认。X 射线衍射（XRD）表明 CS-ZnSe 具有六方晶结构，晶粒尺寸为 12nm。扫描电子显微镜（SEM）照片显示平均纳米光催化剂尺寸为 25nm。能谱分析（EDX）用于确定 CS-ZnSe 的元素组成。CS-ZnSe 对食用柠檬黄和日落黄染料具有优异的光催化降解效率。结果表明，在优化条件下（时间 3 小时、pH5、染料浓度 30ppm、催化剂用量 0.09g 和 0.01g），CS-ZnSe 对食用柠檬黄染料和日落黄（SY）染料的降解效率分别达到 98%和 97%。光催化降解过程的研究结果与两种染料的一级动力学拟合良好。食用柠檬黄染料和 SY 染料的速率常数“K”值分别为 0.001362min 和 0.001257min。而（相关系数，R）的值分别为 0.99307 和 0.99277。通过连续循环使用光催化剂来降解有机染料，证实了其可回收性。结果表明，CS-ZnS 具有高效去除工业废水中有机染料的能力。
