文献类型：期刊文献

英文题名：Evaluation of renewable pH-responsive starch-based flocculant on treating and recycling of highly saline textile effluents

作者：Wang, Kaixiang[1];Ran, Tingmin[1];Yu, Pai[1];Chen, Long[1];Zhao, Jigang[1,3];Ahmad, Ayyaz[4];Ramzan, Naveed[5];Xu, Xiaolin[1];Xu, Yisheng[1,2];Shi, Yulin[1]

机构：[1]Shihezi Univ, Key Lab Green Proc Chem Engn Xinjiang Bingtuan, Sch Chem & Chem Engn, Shihezi 832003, Peoples R China;[2]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[3]East China Univ Sci & Technol, Int Joint Res Ctr Green Energy Chem Engn, Shanghai 200237, Peoples R China;[4]Muhammad Nawaz Sharif Univ Engn & Technol, Dept Chem Engn, Multan 60000, Pakistan;[5]Univ Engn & Technol, Dept Chem Engn, Lahore 54890, Pakistan

年份：2021

卷号：201

外文期刊名：ENVIRONMENTAL RESEARCH

收录：;EI(收录号：20241015684737);WOS:【SCI-EXPANDED(收录号:WOS:000713794100005)】；

基金：This work was supported by the National Natural Science Foundation of China [grant numbers 51764049, 21676089] ; International Scientific and Technological Cooperation Project of Xinjiang Bingtuan [grant number 2018BCE001] ; and Transformation of Technological Achieve-ments in Shihezi University [grant number CGZH201715] .

语种：英文

外文关键词：pH-responsive; Starch-based flocculant; Flocculant sequential regeneration; Saline wastewater reuse; Resource recovery

摘要：Herein, we report a novel renewable pH-responsive starch-based flocculant (CIAT-ST) via etherifying 2-chloro-4,6-isopropylamino-[1,3,5]-triazine (CIAT) onto the starch backbones for decontamination and reuse of highly saline effluents. The obtained CIAT-ST shows a unique pH-sensibility and reversibility in response to a subtle pH change due to a pH-controllable surface charge density of polymer chains. The level of residual CIAT-ST in the solution can be facilely monitored by using UV-vis detection. The dye flocculation performance of CIAT-ST was evaluated by using a batch experiment. The results exhibited that the dye removal was highly dependent on the solution pH (optimal pH was 2), the flocculation equilibrium can be achieved within 5 min, and the maximum flocculation capacity of CIAT-ST for K-2BP and KN-B5 were calculated to be 2452.6 +/- 23.9 and 792.7 +/- 14.1 mg/g, respectively. The multiple flocculation mechanisms, including charge neutralization, bridging and charge patching, may participate in the flocculation process. Adjustment in pH-mediated hydrophilicity-hydrophobicity switch of flocculant facilitates readily recovery and then sequentially reused three times while retaining satisfying flocculation efficiency. A significant contribution was also confirmed that the highly saline effluents after flocculation and sedimentation were reused in three successive dyeing processes without sacrificing fabric quality (Delta E* < 1) due to relatively low polymer residuals, and the efficiency of salt reuse for consecutive regeneration processes could be achieved above 85%. The present work could provide alternative thoughts for the reutilization of spent flocculant and clarified saline wastewater, which is also an efficient and sustainable strategy for textile wastewater management.