文献类型：期刊文献

英文题名：Zeta potential on the anti-scalant modified sub-micro calcite surface

作者：Yuan, Pei-Qing[1];Cheng, Zhen-Min[1];Zhou, Zhi-Ming[1];Yuan, Wei-Kang[1];Semiat, Raphael[2]

机构：[1]E China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]Technion Israel Inst Technol, Dept Chem Engn, Rabin Desalinat Lab, Grand Water Res Inst, IL-32000 Haifa, Israel

年份：2008

卷号：328

期号：1-3

起止页码：60

外文期刊名：COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS

收录：;EI(收录号：20083511493762);WOS:【SCI-EXPANDED(收录号:WOS:000260205000010)】；

语种：英文

外文关键词：Zeta potential; Anti-scalants; Molecular simulation; Sub-micro calcite

摘要：With the view of increasing the understanding to the anti-scaling mechanism in the membrane process, zeta potential on the anti-scalant (Calgon and PAA) modified sub-micro calcite surface was measured and was further characterized with a molecular simulation. Experimental results show that the original positively charged calcite in an aqueous solution is reversed to be negatively charged by introducing anti-scalants at a dosage of ppm level. On the basis of theoretical calculation, the observed reversal is resulted from the statistically predominant orientation of negative potential-determining groups in the adsorbed anti-scalant molecules, i.e. P=O and C=O, stretching against the calcite surface. A negative zeta potential prevailing on the calcite surface can effectively prevent the calcite from precipitating on the membrane surface. In the presence of anti-scalants, zeta potential on the sub-micro calcite surface is a sensitive function of calcite content, anti-scalant concentration, salt concentration, and pH of the suspension. (C) 2008 Elsevier B.V. All rights reserved.