To address the problem that iron-loaded chitosan cellulose acetate adsorbent (CS/CA-FeOx) is susceptible to pH,a new composite adsorbent CS/CA-FeMnOx was prepared by introducing Mn2+ into the preparation solution,and its removal property and adsorption mechnism toward Sb(Ⅲ) and Sb(Ⅴ) in water was studied.The experimental results showed that the optimum dosages of CS/CA-FeMnOx for adsorption of both Sb(Ⅲ) and Sb(Ⅴ) with initial concentration of 5mg/L was 1.2g/L at pH 4.0,with maximum adsorption capacity of 44.42mg/g and 56.73mg/g,respectively.The increase of pH from 4.0 to 7.0 had little effect on the removal rate of Sb(Ⅲ),but significantly reduced the removal rate of Sb(Ⅴ),which was decreased by 25.3%.Pseudo second order reaction equation could more accurately describe the both adsorption processes of Sb(Ⅲ) and Sb(Ⅴ) by CS/CA-FeMnOx,which indicated that both adsorptions were combinations of physical and chemical adsorption.Freundlich model could better present the adsorption of CS/CA-FeMnOx for Sb(Ⅲ) and Sb(Ⅴ).The XRD spectra didn't show the peak of manganese oxide,indicating that manganese oxide was either in a low content or in amorphous form.XPS spectra and peak fitting results revealed that antimony in water combined with the metal on the adsorbent,and the combination intensity with Sb(Ⅴ) was higher than that of Sb(Ⅲ).In conclusion,manganese doping in small amount could obviously reduce the negative effect of pH on Sb(Ⅴ) removal,which provided technical support for the construction of an antimony removal system with electrostatic enrichment and chemical adsorption.
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基金资助
国家自然科学基金(51708380)
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