Competitive adsorption of Cu(II) and Pb(II) ions from aqueous solutions by Ca-alginate immobilized activated carbon and Saccharomyces cerevisiae
Competitive adsorption of Cu(II) and Pb(II) ions from aqueous solutions by Ca-alginate immobilized activated carbon and Saccharomyces cerevisiae
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DOI：
10.1007/s11771-013-1760-z
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发表时间：
2013-09-01
影响因子：
4.4
通讯作者：
Wang Hui
中科院分区：
文献类型：
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作者：
Lu Ming;Liu Yun-guo;Wang Hui
为了建立同时去除多种重金属的理论基础，研究了海藻酸钙固定化活性炭和酵母（CAS）对Cu（II）和Pb（II）离子的吸附作用。采用扫描电镜（SEM）和傅里叶变换红外光谱（FTTR）对合成的CAS珠进行了表征。系统考察了初始pH、吸附剂用量、接触时间和初始金属离子浓度对吸附过程的影响。Cu（II）和Pb（II）的最大吸收量分别为64.90和166.31 mg/g。拟二阶速率方程和Langmuir等温线模型分别可以很好地解释单组分体系中Cu（II）和Pb（II）离子的动力学和等温线实验数据。Cu（II）和Pb（II）离子在二元体系中的吸附实验数据分别用扩展Freundlich等温线和扩展Langmuir等温线来描述。Cu（II）离子的去除受共存的Pb（II）离子的存在影响较大，而Cu（II）初始浓度的变化对Pb（II）离子的去除影响较小。用1mol /L HNO3溶液成功再生了CAS。
To establish a theoretical foundation for simultaneous removal of multi-heavy metals, the adsorption of Cu(II) and Pb(II) ions from their single and binary systems by Ca-alginate immobilized activated carbon and Saccharomyces cerevisiae (CAS) was investigated. The CAS beads were characterized by Scanning electron microscope (SEM) and Fourier transformed infrared spectroscopy (FTTR). The effect of initial pH, adsorbent dosage, contact time and initial metal ions concentration on the adsorption process was systematically investigated. The experimental maximum contents of Cu(II) and Pb(II) uptake capacity were determined as 64.90 and 166.31 mg/g, respectively. The pseudo-second-order rate equation and Langmuir isotherm model could explain respectively the kinetic and isotherm experimental data of Cu(II) and Pb(II) ions in single-component systems with much satisfaction. The experimental adsorption data of Cu(II) and Pb(II) ions in binary system were best described by the extended Freundlich isotherm and the extended Langmuir isotherm, respectively. The removal of Cu(II) ions was more significantly influenced by the presence of the coexistent Pb(II) species, while the Pb(II) removal was affected slightly by varying the initial concentration of Cu(II). The CAS was successfully regenerated using 1 mol/L HNO3 solution.