Li Tingting, Yang Xiaohui, Qiao Jiaojiao, Liu Yang, Zhang Ting
School of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou 730050, China.
School of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou 730050, China.
Int J Biol Macromol. 2025 Sep;321(Pt 3):146528. doi: 10.1016/j.ijbiomac.2025.146528. Epub 2025 Aug 4.
In order to improve the adsorption capacity of attapulgite, a novel composite adsorbent EDTA/CS-ATP was synthesized by integrating attapulgite (ATP), chitosan (CS), and ethylenediaminetetraacetic acid (EDTA) by hydrothermal carbonization and grafting method. Under optimized conditions, the composite adsorbent achieved a removal ratio of 92.46 % and an adsorption capacity of 66.31 mg/g for methylene blue (MB) removal. Characterizations revealed that introducing CS and EDTA to ATP enhanced the electrostatic and hydrophobic interactions of ATP, which is beneficial for MB adsorption. Kinetic and thermodynamics studies showed that the adsorption followed pseudo-second-order kinetics and the Langmuir model, indicating a chemisorption-driven monolayer binding mechanism. Hydrogen bonding, electrostatic attraction, and π-π interactions were identified as the key mechanisms contributing to MB capture. Notably, compared to traditional EDTA-based materials mainly used for heavy metal removal, the EDTA/CS-ATP composite has the multifunctional sites to match the cationic and aromatic structure of MB, exhibiting highly selective and efficient MB removal. This work presents an environmentally friendly and scalable strategy for treating wastewater contaminated with cationic dyes, offering a promising solution for practical applications in water purification.
为了提高凹凸棒石的吸附能力，采用水热碳化和接枝法将凹凸棒石（ATP）、壳聚糖（CS）和乙二胺四乙酸（EDTA）整合，合成了一种新型复合吸附剂EDTA/CS-ATP。在优化条件下，该复合吸附剂对亚甲基蓝（MB）的去除率达到92.46%，吸附容量为66.31 mg/g。表征结果表明，将CS和EDTA引入ATP增强了ATP的静电和疏水相互作用，有利于MB的吸附。动力学和热力学研究表明，吸附遵循准二级动力学和朗缪尔模型，表明是化学吸附驱动的单层结合机制。氢键、静电吸引和π-π相互作用被确定为有助于捕获MB的关键机制。值得注意的是，与主要用于去除重金属的传统EDTA基材料相比，EDTA/CS-ATP复合材料具有与MB的阳离子和芳香结构相匹配的多功能位点，表现出对MB的高选择性和高效去除。这项工作提出了一种环境友好且可扩展的策略来处理受阳离子染料污染的废水，为水净化的实际应用提供了一个有前景的解决方案。
