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Biosorption of cadmium (ii) ion from aqueous solution by Afzelia africana

机译：非洲菊对水溶液中镉（ii）离子的生物吸附

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The batch adsorption of cadmium (II) ion from aqueous solution using low-cost adsorbent of biological origin,?Afzelia africana?shell under different experimental conditions was investigated in this study. The influences of initial Cd (II) ion concentration, initial pH, contact times and temperature were reported. Adsorption of Cd (II) was found to be pH dependent and the results indicate that the optimum pH for its removal from aqueous solution was 5. No marginal effect on the biosorption of cadmium was detected for temperatures between 298 and 313K as observed from their Langmuir isotherm constants (qmax) at different temperatures. qmax?values obtained at the different temperatures of 298, 303 and 313K were 13.59, 14.04 and 14.27 mg g-1, respectively. The adsorption equilibrium shows that the process followed both Freundlich and Langmuir models with Freundlich giving a better fit for the adsorption data in comparison to the Langmuir model. The fit of the adsorption data into Freundlich model shows that the adsorption process was predominantly a physisorption. The results reveal that cadmium (ll) was considerably adsorbed on theA. africana?shell and could serve as an economical method for the removal of cadmium from aqueous solutions.
机译：本研究研究了在不同的实验条件下，使用低成本的生物来源的非洲黑非洲贝壳吸附剂从水溶液中批量吸附镉离子的方法。报道了初始Cd（II）离子浓度，初始pH，接触时间和温度的影响。发现镉（II）的吸附与pH有关，结果表明从水溶液中去除镉的最佳pH为5。从Langmuir观察到的温度在298至313K之间，未检测到对镉生物吸附的边际效应在不同温度下的等温常数（qmax）。在298、303和313K的不同温度下获得的q max值分别为13.59、14.04和14.27mg g-1。吸附平衡表明，该过程遵循Freundlich和Langmuir模型，与Langmuir模型相比，Freundlich更适合吸附数据。吸附数据对Freundlich模型的拟合表明吸附过程主要是物理吸附。结果表明，镉（II）被大量吸附在A上。非洲菊壳并且可以用作从水溶液中去除镉的经济方法。

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