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Effects of humic acids with different molecular weights on the adsorption behavior of bromide on MIEX resin

  • Lei DING Yang GAO Yunhan JIA Meiying ZHONG
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  • 1. School of Civil Engineering and Architecture, Auhui University of Technology, Ma?anshan, Anhui 243032, China 2. Engineering Research Center of Biomembrane Water Purification and Utilization Technology, Ministry of Education, Ma?anshan, Anhui 243032, China

Received date: 2018-03-23

  Revised date: 2018-07-12

  Online published: 2018-12-19

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.

Cite this article

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]. The Chinese Journal of Process Engineering, 2018 , 18(6) : 1332 -1339 . DOI: 10.12034/j.issn.1009-606X.218160

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