文献类型：期刊文献

英文题名：Experimental and theoretical study on removal of organic contaminants with various function groups via suspension freezing separation

作者：Chen, Peng[1];Liu, Xie[1];Lu, Zhihao[3];Jin, Liang[1];Cai, Lankun[1];Zhang, Lehua[1,2,4];Wang, Hualin[1,2];Yan, Ying[1,2,4]

机构：[1]East China Univ Sci & Technol, Natl Engn Lab Ind Wastewater Treatment, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Resources & Environm Engn, State Environm Protect Key Lab Environm Risk Asse, Shanghai 200237, Peoples R China;[3]Chinese Acad Sci, Fujian Inst Res Struct Matter, State Key Lab Struct Chem, Fuzhou 350002, Fujian, Peoples R China;[4]Shanghai Inst Pollut Control & Ecol Secur, Shanghai 200092, Peoples R China

年份：2021

卷号：259

外文期刊名：SEPARATION AND PURIFICATION TECHNOLOGY

收录：;EI(收录号：20205209680497);WOS:【SCI-EXPANDED(收录号:WOS:000605006000003)】；

基金：This work was supported by the National Key R&D Program of China, Highefficient Development and Utilization of Water Resource (2019YFC0408202), the National Natural Science Foundation of China (NSFC) (21876050).

语种：英文

外文关键词：Hydrogen bond; Suspension freezing; Functional group; Ice purity; Quantum computation

摘要：Attention is drawn to the freezing method for separating organic contaminants from industrial wastewater and simultaneously recovering valuable materials, but the mechanism regarding functional group of organic contaminants how affect ice purity remains unclear. In this work, four types of organics, including hexane, hexanoic acid, N-hexanol and N-hexanal, with various oxygen functional groups were selected as organic contaminants and studied to be separated from aqueous solutions by the suspension freezing method. Experimental results revealed that their separation efficiencies were 67.07%, 87.75%, 94.71% and 95.32%, respectively, after freezing 30 min at 200 rpm and -0.9 degrees C. The presented theoretical work reveals that hexane, as a non-polar organic contaminant without function group, unable to form hydrogen bonds with water clusters, making it more readily to precipitate and stick on ice surface during freezing, which significantly increased ice impurities with the lowest separation efficiency. Presence of functional group promotes organics to solute in concentrate via forming H-bond with water clusters, and thus improves ice purity by avoiding of precipitation. Hexanoic acid with the largest absorption energy with ice crystal tend to adsorb on ice surface but not stay in concentrate and showed the highest ice impurity corresponding to lowest separation efficiency. This work provides new sight for understanding declination of ice purity and separation efficiency caused by functional group of organic contaminants during freezing.