Department of Chemistry, University of Cyprus, P.O. Box 20537, Cy-1678 Nicosia, Cyprus E-mail:
Water Sci Technol. 2013;68(11):2497-504. doi: 10.2166/wst.2013.535.
The adsorption efficiency of a biomass by-product (cactus fibres) regarding the removal of copper(II) from aqueous solutions has been investigated before and after its chemical treatment. The chemical treatment of the biomass by-product included phosphorylation and MnO2-coating. The separation/removal efficiency has been studied as a function of pH, Cu(II) concentration, ionic strength, temperature and contact time. Evaluation of the experimental data shows that the MnO2-coated product presents the highest adsorption capacity, followed by the non-treated and phosphorylated material. Regarding the effect of ionic strength/salinity on the adsorption, in contrast to the removal efficiency of the phosphorylated product, which is significantly affected, the MnO2-coated and non-treated material don't show any effect, indicating the formation of inner-sphere surface complexes. The adsorption reaction is in all cases endothermic and relatively fast, particularly the adsorption on the MnO2-coated product. The results of the present study indicate that for the removal of bivalent metal-ions from contaminated waters the MnO2-coated material is expected to be the most effective adsorbent and an alternative to MnO2 resins for the treatment of environmentally relevant waters.
研究了一种生物质副产物（仙人掌纤维）在化学处理前后对水溶液中铜（II）的去除的吸附效率。生物质副产物的化学处理包括磷酸化和 MnO2 涂层。研究了分离/去除效率作为 pH、Cu（II）浓度、离子强度、温度和接触时间的函数。实验数据的评估表明，MnO2 涂层产品表现出最高的吸附能力，其次是非处理和磷酸化材料。关于离子强度/盐度对吸附的影响，与磷酸化产物的去除效率显著受影响不同，MnO2 涂层和未处理的材料没有表现出任何影响，表明形成了内球表面络合物。吸附反应在所有情况下都是吸热的且相对较快，特别是在 MnO2 涂层产品上的吸附。本研究的结果表明，对于从受污染的水中去除二价金属离子，MnO2 涂层材料预计将是最有效的吸附剂，并且是 MnO2 树脂处理环境相关水的替代品。
