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Biosorption of copper ions from aqueous solution using rape straw powders: Optimization, equilibrium and kinetic studies
Ecotoxicology and Environmental Safety ( IF 6.8 ) Pub Date : 2018-01-04 , DOI: 10.1016/j.ecoenv.2017.12.042
Xin Liu , Zhao-Qiong Chen , Bin Han , Chun-Li Su , Qin Han , Wei-Zhong Chen

In this paper, the adsorption behaviors of Cu(II) from the aqueous solution using rape straw powders were studied. The effects of initial Cu(II) concentration, pH range and absorbent dosage on the adsorption efficiency of Cu(II) by rape straw powder were investigated by Box-Behnken Design based on response surface methodology. The values of coefficient constant of the nonlinear models were 0.9997, 0.9984 and 0.9944 for removal Cu(II) from aqueous solution using rape straw shell, seed pods and straw pith core, respectively, which could navigate the design space for various factors on effects of biosorption Cu(II) from aqueous solution. The various factors of pH and biosorbents dosage were the key factors that affecting the removal efficiency of Cu(II) from aqueous solution. The biosorption equilibrium data presented its favorable monolayer adsorption Cu(II) onto shell, seed pods and straw pith core, respectively. The pseudo-second order kinetic model was the proper approach to determine the adsorption kinetics. The biosorption of Cu(II) onto surfaces of rape straw powders were confirmed and ion-exchanged in the adsorption process by energy dispersive spectrometer. The critical groups, —OH, —CH, —NH3+, —CH3, —NH and —C—O, exhibited by the infrared spectra results, changed to suggest that these groups played critical roles, especially —CH3 in the adsorption of copper ions onto rape straw powders. The study provided evidences that rape straw powders can be used for removing Cu(II) from aqueous water.



中文翻译:

油菜秸秆粉末对水溶液中铜离子的生物吸附:优化,平衡和动力学研究

本文研究了强奸稻草粉对水溶液中Cu(II)的吸附行为。Box-Behnken Design基于响应面法研究了初始Cu(II)浓度,pH范围和吸收剂量对菜籽粉对Cu(II)吸附效率的影响。非线性模型的系数常数分别为0.9997、0.9984和0.9944,用于使用强奸稻草壳,种子荚和稻草髓核从水溶液中去除Cu(II),这可以在设计空间中探索各种因素对铁的影响。从水溶液中吸附铜(II)。pH和生物吸附剂用量的各种因素是影响从水溶液中去除Cu(II)效率的关键因素。生物吸附平衡数据表明其有利的单层吸附Cu(II)分别在壳,种子荚和稻草髓核上。准二级动力学模型是确定吸附动力学的正确方法。通过能量分散光谱仪确定了Cu(II)在油菜秸秆粉末表面的生物吸附并在吸附过程中进行了离子交换。关键基团-OH,-CH,-NH红外光谱结果显示的3 +,-CH 3,-NH和-CO发生变化,表明这些基团起着至关重要的作用,尤其是-CH 3在铜离子吸附到油菜秸秆粉末上时起着至关重要的作用。这项研究提供的证据表明,强奸秸秆粉末可用于从水中去除Cu(II)。

更新日期:2018-01-04
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