文献类型：期刊文献

英文题名：Ultra-high efficient pH induced selective removal of cationic and anionic dyes from complex coexisted solution by novel amphoteric biocomposite microspheres

作者：Wang, Bingjie[1];Yang, Xiaoyong[1];Ma, Liang[1];Zhai, Linlin[1];Xuan, Jin[2];Liu, Changjun[1];Bai, Zhishan[1]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, State Environm Protect Key Lab Environm Risk Asse, Shanghai 200237, Peoples R China;[2]Loughborough Univ, Dept Chem Engn, Loughborough LE11 3TU, Leics, England

年份：2020

卷号：231

外文期刊名：SEPARATION AND PURIFICATION TECHNOLOGY

收录：;EI(收录号：20193307311671);WOS:【SCI-EXPANDED(收录号:WOS:000486133700018)】；

基金：This work is supported by National Key Research and Development Program of China (2016YFCO204500), National Natural Science Foundation of China (51578239, 21878099, 51608203) and the Scientific Research Projects of Shanghai, China (17DZ1202802).

语种：英文

外文关键词：Dyestuff wastewater treatment; Amphoteric carboxymethyl chitosan/gelatin microspheres (CCGMs); pH induced selective removal; Adsorption mechanism

摘要：The substandard discharge of highly toxic dyestuff wastewater will pose a serious threat to the environment and human beings, even causing unimaginable irreversible damages. In the current study, novel amphoteric carboxymethyl chitosan/gelatin microspheres (CCGMs), synthesized by a facile inverse suspension route with two-step successive crosslinking process, were evaluated as a potential adsorbent for high efficient pH induced selective removal of azo-dyes. The as-prepared CCGMs were characterized using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), thermogravimetry analysis (TGA) and X-ray photoelectron spectroscopy (XPS). Various influential factors such as solution pH, temperature, and contact time were employed to ascertain the optimal condition for representative azo-dyes adsorption, including methyl orange (MO) and methylene blue (MB). The maximal adsorption of MO and MB on the CCGMs at pH values of 3 and 11 were 383.142 mg g(-1) and 584.795 mg g(-1), respectively. The adsorption mechanism were demonstrated as the synergistic effect of electrostatic interaction and pi-pi stacking between dyes and CCGMs. Besides, the outstanding and stable regeneration of as-prepared CCGMs were also verified with five consecutive recycling. Thus, the newly developed CCGMs could be a highly promising candidate for dyestuff wastewater treatment.