Martwong Ekkachai, Sukhawipat Nathapong, Junthip Jatupol
Division of Science (Chemistry), Faculty of Science and Technology, Rajamangala University of Technology Suvarnabhumi, Phra Nakhon Si Ayutthaya 13000, Thailand.
Division of Polymer Engineering Technology, Department of Mechanical Engineering Technology, College of Industrial Technology, King Mongkut's University of Technology North Bangkok, Bangkok 10800, Thailand.
Polymers (Basel). 2022 May 28;14(11):2199. doi: 10.3390/polym14112199.
The contamination of hazardous agrochemical substances in water caused essential trouble for humans and the environment. The functional textile was used as an effective adsorbent for paraquat removal from an aqueous solution. The coating of anionic cyclodextrin polymer, issued from the cross-linking between 1,2,3,4-butanetetracarboxylic acid and β-cyclodextrin in the presence of poly (vinyl alcohol), on the cotton cord, was firstly investigated. Their physicochemical characteristics were also characterized by gravimetry, acid-base titration, ATR-FTIR, C NMR, TGA, and stereo-microscopy. The BDP5 system revealed 107.3% coating yield, 1.13 mmol/g COOH groups, and 95.1% paraquat removal for 25 mg/L of initial concentration. The pseudo-second-order model was appropriate for kinetics using 6 h of contact time. Langmuir isotherm was suitable with the maximum adsorption of 30.3 mg/g for paraquat adsorption. The weight loss was 10.7% and 7.8%, respectively, for water and 5% / of HCI in ethanol after 120 h of contact time. Finally, the reusability efficiency stayed at 88.9% after five regeneration.
水中有害农用化学物质的污染给人类和环境带来了重大问题。功能性纺织品被用作从水溶液中去除百草枯的有效吸附剂。首次研究了在棉绳上涂覆由1,2,3,4-丁烷四羧酸与β-环糊精在聚乙烯醇存在下交联而成的阴离子环糊精聚合物。还通过重量法、酸碱滴定、ATR-FTIR、C NMR、TGA和立体显微镜对其物理化学特性进行了表征。BDP5体系的涂层产率为107.3%，COOH基团含量为1.13 mmol/g，对于初始浓度为25 mg/L的百草枯去除率为95.1%。使用6小时的接触时间，准二级模型适用于动力学。Langmuir等温线适用于百草枯吸附，最大吸附量为30.3 mg/g。接触120小时后，在水中和乙醇中的5% HCl中的重量损失分别为10.7%和7.8%。最后，经过五次再生后，可重复使用效率保持在88.9%。
