水锰矿吸附法去除水中Cr(Ⅲ)的研究  

Research on the Adsorption of Cr(Ⅲ) from Water by Manganite

作　　者：李燕[1] 于化江[1] 孙振满 郑艳[1] 马子川[1] 

机构地区：[1]河北师范大学化学与材料科学学院,河北石家庄050016

出　　处：《河北师范大学学报（自然科学版）》2008年第5期649-652,共4页Journal of Hebei Normal University：Natural Science

基　　金：国家自然科学基金(20477009);河北省自然科学基金(E2005000183)

摘　　要：以合成的水锰矿（γ-MnOOH）为吸附剂，研究了pH、吸附时间、投加量和质量浓度对Cr（Ⅲ）吸附去除效果的影响。并测定了吸附等温线．结果表明：吸附率-pH曲线呈“S”形，当Cr（Ⅲ）初始质量浓度为10mg／L时，发生吸附突跃的pH范围为3．3～6．5，pH〉6．5时容易出现Cr（OH）3沉淀；反应4h时达到吸附平衡；吸附去除率随吸附剂投加量的增加而提高；吸附等温线符合Langmuir方程，在25℃、吸附体系pH=5．0、P（吸附剂）为1g／L的条件下，γ—MnOOH对Cr（Ⅲ）的饱和吸附量为34．01mg／g．With synthetic manganite （γ-MnOOH） as adsorbent, the adsorption of Cr（ Ⅲ ） was investigated as a function of pH, adsorption time, adsorbent dosage and initial concentration of Cr （Ⅲ）, the adsorption isotherm was also determined. The results indicate that the pH-adsorption curve is of S shape, adsorption leaping occurs in the pH scale of 3.3-6.5 at the initial concentration of 10 mg/L,Cr（OH）3 precipitation is apt to occur when pH〉6.5. It takes 4 h to reach the adsorption equilibrium. The removal efficiencies increase with the increase of adsorbent dosage. The adsorption isothermal match to langmuir equation, and the maximum adsorption capacity of Cr（ Ⅲ ） onto γ-MnOOH is 34.01 mg/g under the temperature of 25 ℃, pH of 5.0 and adsorbent dosage of 1.0 g/L.

关 键 词：Γ-MNOOH 吸附 Cr(Ⅲ) 

分 类 号：O647.3[理学—物理化学]