School of Chemistry and Environment, Yunnan Minzu University, Kunming, 650504, PR China; Key Laboratory of Chemistry in Ethnic Medicinal Resources, State Ethnic Affairs Commission & Ministry of Education, Yunnan Minzu University, Kunming, 650504, PR China.
School of Chemistry and Environment, Yunnan Minzu University, Kunming, 650504, PR China.
Environ Res. 2023 Nov 1;236(Pt 2):116778. doi: 10.1016/j.envres.2023.116778. Epub 2023 Jul 28.
The fabrication of an adsorbent with excellent performance has been a focus of attention because of the toxicity, mutagenicity and carcinogenicity of methyl orange (MO)-containing wastewater discharged from the textile, tannery and pharmaceutical industries. In this study, chitosan (CS) membranes were modified with a deep eutectic supramolecular polymer (DESP), and adsorbent membranes with porous structures were prepared with polyethylene glycol (PEG). Microstructural characterization of the CS-DESP-PEG composite membranes with FT-IR, XRD and SEM showed that the membranes had amorphous crystalline structures and that hydrogen bonding interactions weakened the crystallinity and formed loose porous structures. Optimization of the chitosan to β-cyclodextrin ratio, pH, PEG proportion, MO concentration and adsorbent dose significantly improved the adsorption efficiencies of the membranes. The adsorption behaviours of the membranes were fit with pseudo-second-order adsorption kinetics and the Freundlich adsorption isotherm model. Regeneration experiments showed that the membranes were reusable multiple times and maintained good adsorption capacities.
由于纺织、制革和制药等行业排放的含甲基橙（MO）废水具有毒性、致突变性和致癌性，因此制备性能优异的吸附剂一直是研究的重点。本研究采用深共晶超分子聚合物（DESP）对壳聚糖（CS）膜进行改性，并用聚乙二醇（PEG）制备具有多孔结构的吸附剂膜。FT-IR、XRD 和 SEM 对 CS-DESP-PEG 复合膜的微观结构进行了表征，结果表明，膜具有无定形结晶结构，氢键相互作用削弱了结晶度并形成了疏松的多孔结构。优化壳聚糖与β-环糊精的比例、pH 值、PEG 比例、MO 浓度和吸附剂剂量，显著提高了膜的吸附效率。膜的吸附行为符合准二级吸附动力学和 Freundlich 吸附等温线模型。再生实验表明，膜可多次重复使用，并保持良好的吸附能力。
