Multifunctional porous β-cyclodextrin polymer for water purification

IF 12.4 1区 环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL
Lin Sun , Guizhou Xu , Yizhou Tu , Wenrui Zhang , Xuejiao Hu , Pingping Yang , Daishe Wu , Ying Liang , Dongyang Wei , Aimin Li , Xianchuan Xie
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引用次数: 11

Abstract

Keeping water clean is of vital significance for human health and environmental protection. In order to remove organic micro-pollutants and natural organic substances in water bodies and kill pathogenic microorganisms simultaneously, this study synthesized a multifunctional porous β-cyclodextrin polymer with a high specific surface area by introducing quaternary ammonium groups and rigid benzene rings, respectively, which was then polymerized with crosslinking agent-4,4′-bis (chloromethyl)-1,1′-biphenyl (BCMBP) in an ionic liquid system. The grafting of quaternary ammonium groups was beneficial for the removal of negative-charged humic acid (HA) and sterilization. The introduction of numerous rigid structures during benzylation and Friedel-Crafts alkylation reaction could significantly improve the porosity and specific surface area of the polymer, conducive to the exposure of cyclodextrin binding sites and contaminant adsorption. By changing the proportions of quaternization and benzylation, the structure and surface properties of the polymer could be adjusted, thus further regulating the adsorption performance. Compared with activated carbon, the polymer named BQCD-BP with a huge surface area of 1133 m2 g−1 prepared under optimized conditions showed outstanding adsorption performance and sterilization ability. The pseudo-second-order kinetic constant of BQCD-BP reached 1.2058 g·mg−1·min−1, which was approximately 50 times greater than that of activated carbon (0.0256 g·mg−1·min−1) under the same experimental condition. The adsorption capacity of BQCD-BP to HA was twice as high as that to AC, and the antibacterial ability of BQCD-BP was significant, achieving 90% at the dosage of 1g L−1. Moreover, the adsorption process was hardly affected by the hydrochemical conditions, and the polymer was easy to regenerate. In addition, the excellent adsorption and antibacterial performance of the polymer were also identified by natural water treatment. COD was almost completely removed, and the removal efficiency of TP reached 92% after contact with BQCD-BP. The sterilization rate of BQCD-BP to viable bacteria in complex water bodies reached 82%. Undoubtedly, BQCD-BP is a potential multifunctional water treatment material with reasonable design in the actual water purification.

Abstract Image

水净化用多功能多孔β-环糊精聚合物
保持水的清洁对人类健康和环境保护具有重要意义。为了同时去除水体中的有机微污染物和天然有机物,同时杀灭致病微生物,本研究分别通过引入季铵盐基团和刚性苯环,合成了具有高比表面积的多功能多孔β-环糊精聚合物,并与交联剂-4,4′-双(氯甲基)-1,1′-联苯(BCMBP)在离子液体体系中聚合。季铵基团的接枝有利于去除带负电荷的腐植酸(HA)和杀菌。在苄基化和Friedel-Crafts烷基化反应过程中引入大量刚性结构,可以显著提高聚合物的孔隙度和比表面积,有利于环糊精结合位点的暴露和污染物的吸附。通过改变季铵化和苄基化的比例,可以调节聚合物的结构和表面性能,从而进一步调节吸附性能。与活性炭相比,在优化条件下制备的聚合物BQCD-BP具有1133 m2 g−1的巨大表面积,具有优异的吸附性能和杀菌能力。BQCD-BP的伪二级动力学常数达到1.2058 g·mg−1·min−1,是相同实验条件下活性炭的伪二级动力学常数(0.0256 g·mg−1·min−1)的约50倍。BQCD-BP对HA的吸附量是AC的2倍,抑菌能力显著,在1g L−1的用量下达到90%。吸附过程几乎不受水化学条件的影响,且聚合物易于再生。此外,通过对天然水体的处理,也证实了该聚合物具有优异的吸附和抗菌性能。与BQCD-BP接触后,COD几乎被完全去除,TP的去除率达到92%。BQCD-BP对复杂水体中活菌的灭菌率达82%。BQCD-BP设计合理,在实际的水净化中无疑是一种极具潜力的多功能水处理材料。
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来源期刊
Water Research
Water Research 环境科学-工程:环境
CiteScore
20.80
自引率
9.40%
发文量
1307
审稿时长
38 days
期刊介绍: Water Research, along with its open access companion journal Water Research X, serves as a platform for publishing original research papers covering various aspects of the science and technology related to the anthropogenic water cycle, water quality, and its management worldwide. The audience targeted by the journal comprises biologists, chemical engineers, chemists, civil engineers, environmental engineers, limnologists, and microbiologists. The scope of the journal include: •Treatment processes for water and wastewaters (municipal, agricultural, industrial, and on-site treatment), including resource recovery and residuals management; •Urban hydrology including sewer systems, stormwater management, and green infrastructure; •Drinking water treatment and distribution; •Potable and non-potable water reuse; •Sanitation, public health, and risk assessment; •Anaerobic digestion, solid and hazardous waste management, including source characterization and the effects and control of leachates and gaseous emissions; •Contaminants (chemical, microbial, anthropogenic particles such as nanoparticles or microplastics) and related water quality sensing, monitoring, fate, and assessment; •Anthropogenic impacts on inland, tidal, coastal and urban waters, focusing on surface and ground waters, and point and non-point sources of pollution; •Environmental restoration, linked to surface water, groundwater and groundwater remediation; •Analysis of the interfaces between sediments and water, and between water and atmosphere, focusing specifically on anthropogenic impacts; •Mathematical modelling, systems analysis, machine learning, and beneficial use of big data related to the anthropogenic water cycle; •Socio-economic, policy, and regulations studies.
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