羧甲基纤维素-层状双氢氧化物微球的表征及其在去除水溶液中六价铬的应用
Characterization of CMC-LDH beads and their application in the removal of Cr(vi) from aqueous solution.
作者信息
Tan Li, Li Hailong, Liu Mengru
机构信息
State Key Laboratory of Pulp and Paper Engineering, South China University of Technology Guangzhou 510640 China
出版信息
RSC Adv. 2018 Apr 5;8(23):12870-12878. doi: 10.1039/c8ra00633d. eCollection 2018 Apr 3.
In this study, CMC-LDH beads were prepared and characterized using SEM, FTIR and TG analysis. The beads were applied for the removal of Cr(vi) from aqueous solution. The effects of adsorbent dosage, initial pH and initial concentration of Cr(vi) solution on Cr(vi) uptake were investigated in detail. Moreover, adsorption isotherms and adsorption kinetic models were employed to analyze the adsorption process, and a preliminary study of the reusability of the adsorbent was performed. The experimental results showed that the CMC-LDH beads could remove Cr(vi) from aqueous solution efficiently. When the initial concentration of the Cr(vi) solution was 100 mg L and the adsorbent dosage was 12 g L, the removal efficiency of Cr(vi) reached 96.2%. After the CMC-LDH beads were reused 10 times, the removal efficiency of Cr(vi) still remained at 89.6%.
在本研究中，制备了羧甲基纤维素-层状双氢氧化物（CMC-LDH）微球，并通过扫描电子显微镜（SEM）、傅里叶变换红外光谱（FTIR）和热重（TG）分析对其进行了表征。将这些微球用于从水溶液中去除六价铬（Cr(vi)）。详细研究了吸附剂用量、初始pH值和Cr(vi)溶液初始浓度对Cr(vi)吸附量的影响。此外，采用吸附等温线和吸附动力学模型分析吸附过程，并对吸附剂的可重复使用性进行了初步研究。实验结果表明，CMC-LDH微球能够有效地从水溶液中去除Cr(vi)。当Cr(vi)溶液的初始浓度为100 mg/L且吸附剂用量为12 g/L时，Cr(vi)的去除效率达到96.2%。CMC-LDH微球重复使用10次后，Cr(vi)的去除效率仍保持在89.6%。
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