采用新型壳聚糖/聚乙烯醇吸附膜从水溶液中去除 Cu、Cd 和 Ni 离子。
Removal of Cu, Cd and Ni ions from aqueous solution using a novel chitosan/polyvinyl alcohol adsorptive membrane.
机构信息
Department of Petroleum and Chemical Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran.
Department of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, Iran.
出版信息
Carbohydr Polym. 2019 Apr 15;210:264-273. doi: 10.1016/j.carbpol.2019.01.074. Epub 2019 Jan 23.
The chitosan/poly vinyl alcohol membrane was modified by addition of some amine group to the membrane structure utilizing polyethyleneimine (PEI) in order to increase ionic metals adsorbent properties of the membrane. The removal percentage of the modified membranes was compared with the pristine membrane and activated carbon as common adsorbents. The membranes were characterized by FTIR, SEM, swelling degree and porosity measurement. The removal percentage of the membrane containing 0.5 wt.% PEI was more than 60% higher than the activated carbon and more than 40% higher than the pristine membrane. The modified membrane showed excellent adsorption capacity of 112.13, 86.08, and 75.5 mg/g for Cd, Cuand Ni, respectively at 25 °C and pH 6. Adsorption kinetics and equilibrium adsorption isotherm fitted pseudo-second-order kinetic model and Langmuir isotherm model well, respectively. The membrane could be regenerated successfully in NaEDTA aqueous solution with no significant reduction in its adsorption efficiency.
壳聚糖/聚乙烯醇膜通过在膜结构中添加一些胺基来进行改性，利用聚乙烯亚胺（PEI）提高膜对离子金属的吸附性能。将改性膜的去除率与原始膜和常用吸附剂活性炭进行了比较。通过傅里叶变换红外光谱（FTIR）、扫描电子显微镜（SEM）、溶胀度和孔隙率测量对膜进行了表征。含有 0.5wt.%PEI 的膜的去除率比活性炭高 60%以上，比原始膜高 40%以上。改性膜在 25°C 和 pH 6 条件下对 Cd、Cu 和 Ni 的吸附容量分别达到 112.13、86.08 和 75.5mg/g。吸附动力学和平衡吸附等温线分别很好地符合准二级动力学模型和朗缪尔等温线模型。该膜可以在 NaEDTA 水溶液中成功再生，其吸附效率没有明显降低。
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