Department of Mechanical Engineering, Koneru Lakshmaiah Education Foundation, Vaddeswaram, A.P., Green Fields, 522302, India.
Department of Civil Engineering, Koneru Lakshmaiah Education Foundation, Vaddeswaram, A.P., Green Fields, 522302, India.
Environ Sci Pollut Res Int. 2024 Feb;31(9):12748-12779. doi: 10.1007/s11356-024-32021-w. Epub 2024 Jan 24.
The textile industry is responsible for producing large volumes of wastewater that contain a wide variety of dye compounds. This poses a significant environmental hazard and risks harming both ecosystems and living organisms. This review study explores the advancements in adsorption research for dye removal, with a particular emphasis on the development of various adsorbents. The article provides detailed insights into the toxicity and classification of dyes, different treatment techniques, and the characteristics of numerous adsorbents, with special attention to layered double hydroxides (LDH) and clay minerals. A comprehensive list of adsorbents, encompassing natural materials, agricultural by-products, industrial waste, and activated carbon, is discussed for effective removal of different dyes. Furthermore, the review extensively examines the influence of various adsorption variables, such as pH, initial dye concentration, adsorbent dosage, temperature, contact time, ionic strength, and pore volume of the adsorbent. Additionally, the application of response surface methodology for optimizing adsorption variables is elucidated. Commonly, electrostatic attraction, π-π interactions, n-π interactions, van der Waals forces, H-bonding, and pore diffusion play a major role in adsorption mechanism. The review also found that LDH can eliminate a wide range of dyes from wastewater, achieving excellent uptake capacities often exceeding 500 mg/g, with a removal efficiency of 99%. The Langmuir isotherm and pseudo-second-order kinetic equations gave the best fit to most of the adsorption data. Overall, this review serves as a valuable resource for researchers and practitioners seeking sustainable solutions to address the environmental challenges posed by textile dye contamination.
纺织工业负责生产大量含有各种染料化合物的废水。这对环境造成了重大危害,并且有危害生态系统和生物的风险。本综述研究探讨了用于去除染料的吸附研究的进展,特别强调了各种吸附剂的开发。文章详细介绍了染料的毒性和分类、不同的处理技术以及许多吸附剂的特性,特别关注层状双氢氧化物 (LDH) 和粘土矿物。讨论了各种吸附剂的详细列表,包括天然材料、农业副产品、工业废物和活性炭,以有效去除不同的染料。此外,该综述还广泛研究了各种吸附变量的影响,如 pH 值、初始染料浓度、吸附剂用量、温度、接触时间、离子强度和吸附剂的孔体积。此外,还阐述了响应面法在优化吸附变量中的应用。通常,静电吸引、π-π 相互作用、n-π 相互作用、范德华力、氢键和孔扩散在吸附机制中起主要作用。该综述还发现,LDH 可以从废水中去除多种染料,其吸附容量通常超过 500mg/g,去除效率达到 99%。Langmuir 等温线和伪二阶动力学方程最适合大多数吸附数据。总的来说,本综述为研究人员和从业者提供了有价值的资源,以寻求可持续的解决方案来应对纺织染料污染带来的环境挑战。
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