Abstract
A silica support impregnated with 2-hydroxy-5-nonylacetophenone oxime (LIX 84) was prepared after surface modification by -aminopropyltriethoxysilane. Fixed-bed tests were conducted to investigate the capabilities of the prepared adsorbent with respect to the selective removal of copper ions from multi-metal solutions. Break-through curves were obtained using the modified silica for a solution containing Cu2+, Cd2+, Ni2+, Co2+ and Zn2+, as well as an industrial electronics wastewater sample. The copper adsorption capacities for the multi-metal solution and the wastewater were 0.175 and 0.198 mmolg−1, respectively under the conditions used in this study. The copper recovery ratios for the modified silica treated with the multi-metal solution and the wastewater were 86 and 91%, respectively after treating with 0.1 moldm−3 HNO3. The results show that the modified silica, prepared here, has potential value for the selective removal of copper ions from multi-component aqueous solutions containing multi-metals using a fixed-bed reactor. © 2000 Society of Chemical Industry
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