Coagulation of humic acid by PACl with high content of Al13: The role of aluminum speciation

Coagulation of humic acid by PACl with high content of Al13: The role of aluminum speciation
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高含量 Al13 的PACl对腐植酸的絮凝:铝形态的作用

DOI:
10.1016/j.seppur.2009.09.020
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发表时间:
2009-12
影响因子:
8.6
通讯作者:
Huijuan Liu, Chengzhi Hu, He Zhao, Jiuhui Qu
Huijuan Liu, Chengzhi Hu, He Zhao, Jiuhui Qu
中科院分区:
工程技术1区
文献类型:
--
作者:
Huijuan Liu, Chengzhi Hu, He Zhao, Jiuhui Qu

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采用 27Al NMR 谱、固态 27Al NMR 谱、电喷雾电离质谱 (ESI-MS) 和 Al-Ferron 方法研究了铝形态在高 Al13 含量聚合氯化铝 (PACl) 混凝絮凝腐殖酸 (HA) 中的作用。实验结果表明,在混凝过程中,在酸性pH下,Al13聚合物是主导物种,其中一些在较高pH下转变为Al沉淀。 HA 的去除机理与溶液中铝的形态直接相关。研究发现,HA 的最大去除发生在 pH 值 5.0 至 6.0 范围内,这意味着 Al13 聚合物的电荷中和是微酸性 pH 下混凝的主要机制。絮体的zeta电位和固态27Al NMR光谱的结果也证实了正电聚合物在与HA分子的电荷中和方面非常有效。在 pH>6.0 或过量投加时,无定形 Al(OH)3(s) 对 HA 的吸附和吹扫凝聚发挥着重要作用。
The role of aluminum speciation in coagulation–flocculation of humic acid (HA) by polyaluminum chloride (PACl) with high content of Al13was investigated using27Al NMR spectroscopy, solid-state27Al NMR spectroscopy, electrospray ionization mass spectrometry (ESI-MS) and Al-Ferron method. Experimental results show that, in the coagulation process, the Al13polymers are the dominant species in acidic pH and some of them change to Al precipitates at higher pH. The mechanism of HA removal is directly related to the form of aluminum in solution. The maximum removal of the HA is found to occur in the pH range from 5.0 to 6.0, which means that charge neutralization by Al13polymer is the main mechanism of coagulation at slightly acidic pH. The results of zeta potential and solid-state27Al NMR spectroscopy of the flocs also confirm that positive polymers are very effective in charge neutralizing with HA molecules. Adsorption and sweep coagulation of HA by amorphous Al(OH)3(s) play an important role at pH>6.0 or over dosing.
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