Optimization of parameters for adsorption of metal ions onto rice husk ash using Taguchi's experimental design methodology
Optimization of parameters for adsorption of metal ions onto rice husk ash using Taguchi's experimental design methodology
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DOI：
10.1016/j.cej.2007.09.030
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发表时间：
2008-07
影响因子：
15.1
通讯作者：
V. Srivastava;I. D. Mall;I. M. Mishra
中科院分区：
文献类型：
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作者：
V. Srivastava;I. D. Mall;I. M. Mishra
本文论述了优化的各种批参数的同时去除镉（Cd（II）），镍（II）和锌（II））的金属离子从水溶液中的稻壳灰（RHA）使用田口的优化方法。在三个水平上改变各种吸附参数，例如每种金属离子的初始金属浓度（C 0，i）、温度（T）、初始pH（pH 0）、吸附剂剂量（m）和接触时间（t），以观察它们对RHA上金属的总吸附量（qtot）的影响。采用L27正交表进行实验设计，并对实验结果进行信噪比（S/N）和方差分析（ANOVA）。参数m对qtot和S/N比值的贡献率分别为47.38%和37.78%。同时还观察到C 0，i's（即C 0，Cd× C 0，Ni，C 0，Cd× C 0，Zn和C 0，Ni× C 0，Zn）之间的相互作用对RHA同时去除金属离子的原始数据和S/N比数据都有显著贡献。对于预期响应特征qtot，所有考虑的参数及其相互作用在95%置信水平下具有统计学显著性。研究表明，田口的方法是合适的，以优化总金属离子去除实验。当C_0，i=0- 100 mg/l，T=40°C，pH_0 =6，m= 10 g/l，t= 60 min时，对金属离子的吸附效果最佳。结果表明，要使废水中的金属离子达到最低排放标准，需要进行多级吸附处理。
The present paper deals with optimization of various batch parameters for the simultaneous removal of cadmium (Cd(II)), nickel (Ni(II)) and zinc (Zn(II)) metal ions from aqueous solutions by rice husk ash (RHA) using Taguchi's optimization methodology. Various adsorption parameters such as initial metal concentration of each metal ion (C0,i), temperature (T), initial pH (pH0), adsorbent dosage (m) and contact time (t) were varied at three levels to see their effects on the total adsorption of metals onto RHA (qtot). L27orthogonal array (OA) has been used for experimental design, and the results have been analyzed using signal-to-noise (S/N) ratio and Pareto analysis of variance (ANOVA). The parameter m has been found to be the most significant parameter with 47.38 and 37.78% contribution to the qtotand S/N ratio data. It is also observed that the interactions between C0,i's (i.e. C0,Cd×C0,Ni, C0,Cd×C0,Znand C0,Ni×C0,Zn) contribute significantly to both raw and S/N ratio data for simultaneous metal ions removal by RHA. All the parameters and their interactions considered are found to be statistically significant at 95% confidence level for the desired response characteristic, qtot. The study shows that the Taguchi's method is suitable to optimize the experiments for total metal ions removal. The total optimum adsorptive removal of metal ions were obtained with C0,i=0–100mg/l, T=40°C, pH0=6, m=10g/l and t=60min. The results showed that a multi-staged adsorptive treatment is necessary to meet the minimal discharge standards of metal ions in the effluent.