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首页> 外文期刊>International Journal of Environmental Science and Technology >Separation of Cu2+ and Pb2+ by tetraethylenepentamine-modified sugarcane bagasse fixed-bed column: selective adsorption and kinetics
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Separation of Cu2+ and Pb2+ by tetraethylenepentamine-modified sugarcane bagasse fixed-bed column: selective adsorption and kinetics

机译：四亚乙基五胺改性甘蔗渣固定床柱分离Cu2 +和Pb2 +：选择性吸附和动力学

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摘要

Tetraethylenepentamine-modified sugarcane bagasse (SCB) was prepared to improve its adsorption capacity and selectivity toward Cu2+. Adsorption performances of the modified sorbent for Cu2+ were studied in batch system. Separation of Cu2+ from Pb2+ by the modified sorbent fixed-bed column were studied under dynamic system with initial molar concentration ratio ranging from 1:1 to 1:100. The amount of Cu2+ and Pb2+ adsorbed on the saturated column was calculated by the elution curve. Batch experimental results showed that the adsorption capacity of the sorbent for Cu2+ increased from 0.12 to 0.21 mmol g(-1) after modification. Dynamic adsorption results showed that the modified SCB had higher adsorption affinity toward Cu2+ than Pb2+. 0.07 mmol g(-1) of adsorbed Pb2+ was pushed off by Cu2+ during the competitive adsorption process at The breakthrough curves and adsorption kinetics of Cu2+ in the column could be fitted well by the Yoon-Nelson and modified Yoon-Nelson model, respectively. According to the elution curve, the amount of Cu2+ adsorbed on the fixed-bed column were 0.16, 0.16 and 0.15 mmol g(-1), while that of Pb2+ were 0.0016, 0.0051 and 0.0094 mmol g(-1) when increased from 1:1 to 1:10 and 1:100. Cu2+ could be selectively adsorbed and separated from Pb2+ by using the modified sorbent fixed-bed column.
机译：制备了四亚乙基五胺改性的甘蔗渣（SCB）以提高其吸附能力和对Cu2 +的选择性。分批研究了改性吸附剂对Cu2 +的吸附性能。在动态系统中研究了改性吸附剂固定床柱中Cu2 +与Pb2 +的分离，初始摩尔浓度比为1：1至1：100。通过洗脱曲线计算饱和柱上Cu2 +和Pb2 +的吸附量。批处理实验结果表明，改性后吸附剂对Cu2 +的吸附容量从0.12增加到0.21 mmol g（-1）。动态吸附结果表明，改性SCB对Cu2 +的吸附亲和力高于Pb2 +。在竞争性吸附过程中，Cu2 +吸附了0.07 mmol g（-1）的Pb2 +吸附。Yoon-Nelson模型和改进的Yoon-Nelson模型可以很好地拟合柱中Cu2 +的穿透曲线和吸附动力学。根据洗脱曲线，固定床色谱柱上吸附的Cu2 +量从1增加到0.16、0.16和0.15 mmol g（-1），而Pb2 +的吸附量为0.0016、0.0051和0.0094 mmol g（-1）。 1：1至1:10和1：100。通过使用改良的吸附剂固定床色谱柱，可以选择性地吸附和分离Cu2 +与Pb2 +。

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