Department of Chemistry, The Gandhigram Rural Institute-Deemed to be University, Gandhigram, 624 302, Tamil Nadu, India.
Sethu Institute of Technology, Department of Chemistry, Kariapatti, Virthunagar District, Tamil Nadu, India.
Environ Res. 2023 Dec 1;238(Pt 1):117032. doi: 10.1016/j.envres.2023.117032. Epub 2023 Sep 4.
Rapid industrial expansion leads to environmental pollution especially in an aqueous environment. Photocatalytic degradation is one of the most efficient and environmentally friendly techniques used to treat industrial pollution due to its complete degradation capability of a variety of water contaminants to their non-toxic state. Graphitic carbon nitride (gCN) and molybdenum disulfide (MoS) provide efficient dye degradation, but MoS has few disadvantages. Hence, chitosan (CS) supported gCN-MoS hybrid nanocomposite was developed in this study to reduce these issues by accelerating the degradation of dye molecules such as rhodamine-B under visible light. The prepared gCN@CS-MoS hybrid nanocomposite was thoroughly characterized using various analytical tools including FTIR, XRD, SEM, EDX, XPS, UV-Visible, and PL spectra. Several influencing parameters such as irradiation time, initial pH, dosage, and initial dye concentration were optimized by batch mode. The photodegradation of rhodamine-B could be induced by the heterogeneous gCN@CS-MoS-water hybrid nanocomposite. The narrow band gap of gCN@CS-MoS (1.80 eV) makes it suitable for effective degradation of rhodamine-B due to more active in the visible region and attained its highest degradation efficiency of 99% after 40 min at pH 8 with minimum dosage of 60 mg. The possible degradation mechanism was tentatively proposed for rhodamine-B dye molecules from aqueous environment. The present work shows a novel photocatalyst for the purification and detoxification of dye molecules as well as other water contaminants found in polluted wastewater.
快速的工业扩张导致环境污染，尤其是在水环境中。光催化降解是处理工业污染最有效和最环保的技术之一，因为它具有将各种水污染物完全降解为无毒状态的能力。石墨相氮化碳 (gCN) 和二硫化钼 (MoS) 提供了高效的染料降解能力，但 MoS 也存在一些缺点。因此，本研究中开发了壳聚糖 (CS) 负载的 gCN-MoS 杂化纳米复合材料，通过加速如罗丹明-B 等染料分子的降解来减少这些问题，该染料分子在可见光下进行降解。通过各种分析工具，包括 FTIR、XRD、SEM、EDX、XPS、UV-Visible 和 PL 光谱，对制备的 gCN@CS-MoS 杂化纳米复合材料进行了彻底的表征。通过批处理模式优化了几个影响参数，如照射时间、初始 pH 值、剂量和初始染料浓度。罗丹明-B 的光降解可以由异质 gCN@CS-MoS-水杂化纳米复合材料诱导。gCN@CS-MoS 的窄带隙 (1.80 eV) 使其适合于有效降解罗丹明-B，因为它在可见光区域更活跃，并在 pH 值为 8 时，剂量为 60 mg 时，40 分钟后达到最高降解效率 99%。从水溶液中提出了罗丹明-B 染料分子的可能降解机制。本工作展示了一种用于净化和解毒水中染料分子以及其他污染废水中发现的水污染物的新型光催化剂。
