Sodha Veena, Koshti Hardik, Gaur Rama, Ahmad Irfan, Bandyopadhyay Rajib, Shahabuddin Syed
Department of Chemistry, School of Energy Technology, Pandit Deendayal Energy University, Knowledge Corridor, Raisan, Gandhinagar, 382426, Gujarat, India.
Department of Clinical Laboratory Sciences, College of Applied Medical Sciences, King Khalid University, Abha, 61421, Saudi Arabia.
Environ Sci Pollut Res Int. 2023 Apr;30(16):46159-46174. doi: 10.1007/s11356-023-25556-x. Epub 2023 Jan 30.
The generation of wastewater has increased rapidly with the expansion of industries, hence, posing a risk to human health and the environment. The development of novel materials and technologies for textile wastewater treatment is constantly evolving. In this work, the photocatalytic degradation of methylene blue employing ZSM-5 zeolite-doped polyaniline composites is presented. To fabricate ZSM-5-based polyaniline (PANI) composites, the simple approach of in situ oxidative polymerization has been adopted. Different weight ratios of ZSM-5 have been used for the synthesis, and samples have been labelled as PAZe-1, PAZe-5, and PAZe-10. Different characterization techniques were used to characterize the prepared composites, including field-emission scanning electron microscope (FESEM), transmission electron microscope (TEM), Fourier transform infrared (FT-IR), X-ray diffraction (XRD), and thermo-gravimetry analysis (TGA). The photocatalytic performance of polyaniline, ZSM-5, and their composites was assessed by monitoring the degradation of methylene blue in the presence of visible light. Degradation results of the polyaniline-doped composites were found to be better than that of the polyaniline alone. When the photocatalytic efficiencies of different composites were compared, the PAZe-1 showed the best performance, with 99.9% degradation efficiency after 210 min of irradiation, while PANI, PAZe-5, PAZe-10, and ZSM-5 show 38%, 82%, 71%, and 99% removal efficiency. Apart from methylene blue, the composite PAZe-1 was further explored for the degradation of other organic pollutants such as methyl orange, chlorpyrifos, 2,4-dichlorophenoxy acetic acid, and p-nitroaniline. To determine the reactive species involved in the photocatalysis mechanism, scavenger studies were performed.
随着工业的扩张，废水的产生量迅速增加，因此对人类健康和环境构成了风险。用于纺织废水处理的新型材料和技术的开发也在不断发展。在这项工作中，展示了采用ZSM-5沸石掺杂聚苯胺复合材料对亚甲基蓝进行光催化降解的过程。为了制备基于ZSM-5的聚苯胺（PANI）复合材料，采用了原位氧化聚合的简单方法。合成过程中使用了不同重量比的ZSM-5，并将样品标记为PAZe-1、PAZe-5和PAZe-10。使用了不同的表征技术来表征制备的复合材料，包括场发射扫描电子显微镜（FESEM）、透射电子显微镜（TEM）、傅里叶变换红外光谱（FT-IR）、X射线衍射（XRD）和热重分析（TGA）。通过监测可见光存在下亚甲基蓝的降解情况，评估了聚苯胺、ZSM-5及其复合材料的光催化性能。发现聚苯胺掺杂复合材料的降解结果优于单独的聚苯胺。当比较不同复合材料的光催化效率时，PAZe-1表现出最佳性能，辐照210分钟后降解效率达到99.9%，而PANI、PAZe-5、PAZe-10和ZSM-5的去除效率分别为38%、82%、71%和99%。除了亚甲基蓝，还进一步研究了复合材料PAZe-1对其他有机污染物如甲基橙、毒死蜱、2,4-二氯苯氧乙酸和对硝基苯胺的降解情况。为了确定光催化机理中涉及的活性物种，进行了清除剂研究。
