摘要
利用溶液中MnSO4与KMnO4之间的氧化还原反应制备了δ-MnO2。用透射电镜和BET法对δ-MnO2进行了表征。实验结果表明:δ-MnO2比表面积为324.58m2/g,孔体积为0.39cm3/g,孔径为4.82nm。对Cd2+的吸附实验结果表明:δ-MnO2对Cd2+具有很强的吸附能力,吸附作用强烈依赖体系的pH,吸附边界pH为2.50;pH为6.05时Cd2+的吸附率为98.5%。宏观的吸附-解吸热力学实验证明:当pH为3.30时,为可逆吸附;当pH为6.05时,吸附过程存在固体浓度效应,为不可逆吸附。吸附过程主要为一价阳离子的交换吸附。
δ-MnO2 was prepared by oxidation-reduction with MnSO4 and KMnO4 in solution and characterized by TEM and BET. The specific surface of δ-MnO2 is 325 m^2/g, its pore volume is 0.39 mL/g and its pore diameter is 4.8 nm. The results of adsorption experiment indicate that： The adsorption capability of δ-MnO2 to Cd^2＋ is strong and greatly depends on the system pH, and the boundary pH for adsorption is 2. 50; The adsorption rate of Cd^2＋ is 98.5% when the pH is 6.05. The results of macroscopic adsorption-desorption thermodynamic experiment show that： When the pH is 3.30, the adsorption of Cd^2＋ on δ-MnO2 is reversible; When the pH is 6.05, the adsorption is irreversible because of solid concentration effect. The adsorption is mainly the exchange adsorption of monovalence cations.
出处
《化工环保》
CAS
CSCD
北大核心
2007年第3期222-226,共5页
Environmental Protection of Chemical Industry
基金
国家自然科学基金资助项目(20477009)
河北省教育厅科学基金资助项目(2004443)
关键词
二氧化锰
吸附
镉离子
孔体积
孔径
固体浓度
manganese dioxide
adsorption
cadmium ion
pore volume
pore diameter
solid concentration
