Singh Amit Kumar, Giannakoudakis Dimitrios A, Arkas Michael, Triantafyllidis Konstantinos S, Nair Vaishakh
Department of Chemical Engineering, National Institute of Technology Karnataka (NITK), Surathkal, Mangalore 575025, India.
Laboratory of Chemical and Environmental Technology, Department of Chemistry, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece.
Nanomaterials (Basel). 2023 Feb 15;13(4):735. doi: 10.3390/nano13040735.
Textile effluents pose a massive threat to the aquatic environment, so, sustainable approaches for environmentally friendly multifunctional remediation methods degradation are still a challenge. In this study, composites consisting of bismuth oxyhalide nanoparticles, specifically bismuth oxychloride (BiOCl) nanoplatelets, and lignin-based biochar were synthesized following a one-step hydrolysis synthesis. The simultaneous photocatalytic and adsorptive remediation efficiency of the Biochar-BiOCl composites were studied for the removal of a benchmark azo anionic dye, methyl orange dye (MO). The influence of various parameters (such as catalyst dosage, initial dye concentration, and pH) on the photo-assisted removal was carried out and optimized using the Box-Behnken Design of RSM. The physicochemical properties of the nanomaterials were characterized by scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction, thermogravimetric analysis, nitrogen sorption, and UV-Vis diffuse reflectance spectroscopy (DRS). The maximum dye removal was observed at a catalyst dosage of 1.39 g/L, an initial dye concentration of 41.8 mg/L, and a pH of 3.15. The experiment performed under optimized conditions resulted in 100% degradation of the MO after 60 min of light exposure. The incorporation of activated biochar had a positive impact on the photocatalytic performance of the BiOCl photocatalyst for removing the MO due to favorable changes in the surface morphology, optical absorption, and specific surface area and hence the dispersion of the photo-active nanoparticles leading to more photocatalytic active sites. This study is within the frames of the design and development of green-oriented nanomaterials of low cost for advanced (waste)water treatment applications.
纺织废水对水生环境构成巨大威胁，因此，开发可持续的环境友好型多功能修复方法用于降解仍然是一项挑战。在本研究中，通过一步水解合成法制备了由卤氧化铋纳米颗粒，特别是氯氧化铋（BiOCl）纳米片和木质素基生物炭组成的复合材料。研究了生物炭 - BiOCl复合材料对基准偶氮阴离子染料甲基橙染料（MO）的同时光催化和吸附修复效率。使用响应曲面法的Box - Behnken设计对各种参数（如催化剂用量、初始染料浓度和pH值）对光辅助去除的影响进行了研究并进行了优化。通过扫描电子显微镜、能量色散X射线光谱、X射线衍射、热重分析、氮吸附和紫外 - 可见漫反射光谱（DRS）对纳米材料的物理化学性质进行了表征。在催化剂用量为1.39 g/L、初始染料浓度为41.8 mg/L和pH值为3.15时观察到最大染料去除率。在优化条件下进行的实验在光照60分钟后导致MO的100%降解。由于表面形态、光吸收和比表面积的有利变化，以及光活性纳米颗粒的分散导致更多的光催化活性位点，活性生物炭的掺入对BiOCl光催化剂去除MO的光催化性能产生了积极影响。本研究属于设计和开发用于先进（废水）处理应用的低成本绿色导向纳米材料的范畴。
