Department of Chemical and Materials Engineering, "National" I-Lan University, I-Lan 260, Taiwan, China.
J Environ Sci (China). 2011;23(1):44-50. doi: 10.1016/s1001-0742(10)60371-3.
A magnetic adsorbent can be easily recovered from treated water by magnetic force, without requiring further downstream treatment. In this research, amine-functionalized silica magnetite has been synthesized using N-[3-(trimethoxysilyl)propyl]-ethylenediamine (TPED) as a surface modification agent. The synthesized magnetic amine adsorbents were used to adsorb copper ions in an aqueous solution in a batch system, and the maximum adsorption was found to occur at pH 5.5 +/- 0.1. The adsorption equilibrium data fitted the Langmuir isotherm equation reasonably well, with a maximum adsorption capacity of 10.41 mg/g. A pseudo second-order model could best describe the adsorption kinetics, and the derived activation energy was 26.92 kJ/mol. The optimum condition to desorb Cu2+ from NH2/SiO2/Fe3O4 was provided by a solution with 0.1 mol/L HNO3.
一种磁性吸附剂可以通过磁力从处理过的水中轻松回收，而无需进一步的下游处理。在这项研究中，使用 N-[3-(三甲氧基硅基)丙基]-乙二胺（TPED）作为表面改性剂合成了胺功能化硅磁铁矿。合成的磁性胺吸附剂用于在批处理系统中吸附水溶液中的铜离子，发现最大吸附发生在 pH 5.5 +/- 0.1。吸附平衡数据很好地符合朗缪尔等温线方程，最大吸附容量为 10.41mg/g。拟二级模型可以很好地描述吸附动力学，得出的活化能为 26.92kJ/mol。从 NH2/SiO2/Fe3O4 上解吸 Cu2+的最佳条件是 0.1mol/L HNO3 溶液。
