不同分子质量的腐殖酸对溴离子在MIEX树脂上吸附行为的影响

doi:10.12034/j.issn.1009-606X.218160

摘要/Abstract

摘要： 采用静态吸附法研究了不同分子量的腐殖酸对溴离子(Br?)在MIEX树脂上吸附行为的影响. 结果表明，pH为中性时，4种腐殖酸(分子量分别为小于1000, 1000?5000, 5000?10000, 大于10000)使MIEX树脂对Br?的去除率从80.05%分别降至75.39%, 26.32%, 42.67%和49.03%，而酸性(pH<5.0)或碱性(pH>9.0)时，各种腐殖酸则会促进Br?去除，pH为11.0时去除效率增加最明显. 分子量大于10000的腐殖酸可将吸附平衡时间由60 min缩短至20 min，分子质量1000?5000和5000?10000的腐殖酸可将吸附平衡时间缩短至40 min. 但不论有无腐殖酸，MIEX树脂对Br?的吸附过程均符合拟二级反应动力学模型. 不同分子量的腐殖酸均能明显降低Br?在MIEX树脂上的吸附平衡容量，分子量大于10000的腐殖酸影响最大，但均不改变吸附平衡模型类型，吸附平衡规律用Langmuir与Freundlich模型均可很好描述. 不同分子量的腐殖酸对MIEX树脂去除Br?的影响与溶液pH值密切相关，腐殖酸会加速Br?在树脂上的吸附过程，但不改变吸附平衡及动力学模型类型.

关键词: MIEX树脂, 溴离子, 分子质量, 腐殖酸, 吸附

Abstract: The effects of humic acid (HA) with different molecular weights on the adsorption behavior of bromide on magnetic ion exchange (MIEX) resin were investigated by static adsorption test. The results showed that four fractions of humic acid with different molecular weights (<1000, 1000?5000, 5000?10000, >10000) decreased the removal efficiency of bromide by magnetic ion exchange resin from 80.05% to 75.39%, 26.32%, 42.67% and 49.03% at pH 7.0, respectively. However, each fraction of humic acid with different molecular weights mentioned above improved the removal rate of bromide by magnetic ion exchange resin at acidic (pH<5.0) or alkaline (pH>9.0) condition and the increase of removal efficiency was the most obvious when the pH was 11.0. The humic acid with molecular weight >10000 shortened the time needed to attain the equilibrium of bromide adsorbed on magnetic ion exchange resin from 60 min to 20 min, and those with molecular weights 1000?5000, and 5000?10000 reduced the adsorption equilibrium time of bromide to 40 min. The process of bromide adsorbed on magnetic ion exchange resin followed the pseudo-second-order kinetic equation, regardless of whether humic acid existed or not. The adsorption equilibrium capacity of bromide on magnetic ion exchange resin was significantly reduced by various molecular weight humic acid components, which shortened sharply of the humic acid with molecular weight >10000. But the adsorption equilibrium model type of bromine on magnetic ion exchange resin was not changed. Both Langmuir isotherm model and Freundlich isotherm models described the equilibrium of bromide adsorbed on magnetic ion exchange resin well. The effects of humic acids with different molecular weights on the removal of bromide by magnetic ion exchange resin is closely related to pH of solution, and various humic acid components accelerated the adsorption process of bromide on magnetic ion exchange resin, but not change the type of adsorption equilibrium and kinetic models.

Key words: MIEX resin, bromide, molecular weight, adsorption

丁磊高阳贾韫翰钟梅英. 不同分子质量的腐殖酸对溴离子在MIEX树脂上吸附行为的影响[J]. 过程工程学报, 2018, 18(6): 1332-1339.

Lei DING Yang GAO Yunhan JIA Meiying ZHONG. Effects of humic acids with different molecular weights on the adsorption behavior of bromide on MIEX resin[J]. Chin. J. Process Eng., 2018, 18(6): 1332-1339.

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