Magnetic Polyacrylic Anion Exchange Resin: Preparation, Characterization and Adsorption Behavior of Humic Acid

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• 作者：Chendong Shuang ; Fei Pan ; Qing Zhou ; Aimin Li ; Penghui Li ; Weiben Yang
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2012
• 出版时间：March 21, 2012
• 年：2012
• 卷：51
• 期：11
• 页码：4380-4387
• 全文大小：408K
• 年卷期：v.51,no.11(March 21, 2012)
• ISSN：1520-5045

文摘

Magnetic polyacrylic resin (R0) was prepared by suspension polymerization in the presence of 纬-Fe₂O₃ and 纬-methacryloxypropyltrimethoxysilane (纬-MPS). The obtained magnetic resin (R0) was modified sequentially by ammonolysis and alkylation to produce a magnetic weakly basic anion exchange resin (R1) and a magnetic strongly basic anion exchange resin (R2). Infrared (IR) spectra, elemental analysis, scanning electron microscopy (SEM), magnetization, Brunauer鈥揈mmett鈥揟eller (BET) surface area and chemical analysis were all determined to characterize these resins. The investigation of humic acid (HA) adsorption on R0, R1, and R2 showed that chemical interactions between the functional groups of the resin and HA were responsible for HA adsorption. The adsorption capacity of HA on R1 was 20%鈥?0% less than that of R2, but the R1 resin was easier to regenerate with NaOH aqueous solution. A mixture of 1% NaCl and 1% NaOH was found to be highly efficient for the regeneration of both R1 and R2 resins, with desorption efficiencies measuring >90%. Pseudo-second-order model and Freundlich equation fit better for HA adsorption onto R1 and R2 than other typical kinetic and thermodynamic models, respectively. The effects of pH, coexisting salts (i.e., NaCl and Na₂SO₄), and recyclability were also assessed.