Characteristics of nanosized polyaluminum chloride coagulant prepared by electrolysis process
Characteristics of nanosized polyaluminum chloride coagulant prepared by electrolysis process
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电解法制备纳米聚合氯化铝混凝剂的特点
DOI：
10.1016/s0927-7757(02)00542-3
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发表时间：
2003-04-15
影响因子：
5.2
通讯作者：
Zhang, SJ
中科院分区：
文献类型：
--
作者：
Liu, HJ;Qu, JH;Zhang, SJ
聚氯化铝（PAC）由于其优于传统混凝剂的优点，成为混凝研究的热点。本研究提出了一种电解法制备聚丙烯腈的新方法。采用Al-27 NMR、动态光散射（DLS）和透射电子显微镜（TEM）对产物进行了表征。结果表明，在较高的总铝（Al- t）浓度（0.2 ~ 2.0 mol l(-1)）下，电解过程为大量活性物质（Al-13聚合物）的形成提供了有利条件。对于不同浓度的Al- t， OH/Al (n)的摩尔比对Al-13的生成有一定的影响。当n值< 2.0时，Al-13在溶液中稳定6个月以上。然而，在n值高于2.2的溶液中，Al-13逐渐转化为Al-27核磁共振光谱无法检测到的其他多核形式。DLS和TEM结果表明，电解制得的聚丙烯腈中存在纳米级颗粒。(C) 2002 Elsevier Science B.V.版权所有
Polyaluminum chloride (PAC) has become a focus of many studies involving coagulation because of its advantages over traditional coagulants. In this study, a novel method involving an electrolysis process for preparing of PAC was developed. The products were characterized using Al-27 NMR spectroscopy, dynamic light scattering (DLS) and transmission electron micrograph (TEM). Results indicated that the electrolysis process provided favorable conditions for the formation of significant quantities of active species (Al-13 polymer) at relatively high concentrations of total Al (Al-T) (0.2-2.0 mol l(-1)). For each concentration of Al-T, there was an optimum molar ratio of OH/Al (n) for formation of Al-13. The Al-13 species was stable for more than 6 months in solution when the n value was < 2.0. However, in solutions with n values above 2.2, the Al-13 species gradually converted to other polynuclear forms that were not detectable by Al-27 NMR spectroscopy. The results of DLS and TEM showed that the particles existing in PAC prepared by the electrolysis process were in the nanometer size range. (C) 2002 Elsevier Science B.V. All rights reserved.