Reuse Potential of Carbon Nanotubes in Removing Cadmium from Water

Abdullah Al-Mamun, M. Al-Khatib, R. Danial, A. Salihu, M. Alam
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Abstract

This study was aimed at determining the optimum condition for desorption of cadmium loaded carbon nanotubes (cCNTs) for re-adsorption of the same metal ion. Two independent parameters (contact time and HCl concentrations) were subjected to statistical optimization by face centered central composite design (FCCCD). Maximum desorption cCNT was achieved under the optimized conditions of pH 1.40 and 130 min contact time. The coefficient of determination (R2) of the developed model was found to be 0.988, indicating the fitness of the experimental and predicted responses. Following the desorption experiments, the efficiency of re-adsorption of Cd2+ by the CNT was 61.08%. The reduced re-adsorption capacity of CNT could be linked to modification of its sorption sites based on acid desorption process.
碳纳米管去除水中镉的再利用潜力
本研究旨在确定负载镉的碳纳米管(cCNTs)解吸的最佳条件,以重新吸附相同的金属离子。通过面心中心复合设计(FCCCD)对两个独立参数(接触时间和HCl浓度)进行统计优化。在pH为1.40、接触时间为130 min的优化条件下,cCNT的解吸效果最佳。建立的模型的决定系数(R2)为0.988,表明实验响应与预测响应的拟合性。通过解吸实验,碳纳米管对Cd2+的再吸附效率为61.08%。碳纳米管再吸附能力的降低可能与基于酸解吸过程的吸附位点的修饰有关。
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