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将铁盐与铜盐在碱性条件下共沉淀后,经低温干燥制备了铁铜双金属氧化物。考察投加量、初始浓度、共存阴离子对铁铜双金属氧化物吸附Sb(Ⅲ)性能的影响,并对吸附动力学、等温吸附特征和热力学进行了系统的研究。结果表明:吸附在24 h后达到平衡,在p H为5.0,温度为25℃,0.03 g铁铜双金属氧化物对40 mg/L Sb(Ⅲ)的去除率为81.30%,去除能力达到108.41 mg/g。该吸附过程符合准二级动力学方程和Freundlich等温吸附模型,反应的吉布斯自由能ΔG<0,为自发反应。机理分析表明铁铜双金属氧化物去除溶液中Sb(Ⅲ)主要以物理吸附为主,吸附剂经过4次吸附、解析再生后,对Sb(Ⅲ)去除效果不错。
After iron salts and copper salts were coprecipitated under alkaline conditions, iron-copper bimetallic oxides were prepared by low-temperature drying. The effects of dosage, initial concentration and coexisting anions on Sb (Ⅲ) adsorption on iron-copper bimetallic oxide were investigated. The adsorption kinetics, isothermal adsorption characteristics and thermodynamics were systematically studied. The results showed that the adsorption equilibrium reached at 24 h, and the removal rate of 40 mg / L Sb (Ⅲ) was found to be 81.30% when the concentration of p H was 5.0 and the temperature was 25 ℃. The removal efficiency of 0.03 g iron-copper bimetallic oxide was 108.41 mg / g. The adsorption process accords with quasi-second-order kinetic equation and Freundlich adsorption isotherm model. The Gibbs free energy of reaction, ΔG <0, is a spontaneous reaction. The mechanism analysis shows that Sb (Ⅲ) in the iron-copper bimetallic oxide removal solution mainly consists of physical adsorption. After the adsorbent is adsorbed for 4 times, the removal of Sb (Ⅲ) is good after it is analyzed and regenerated.