Rengaraj S, Joo Cheol Kyun, Kim Younghun, Yi Jongheop
School of Chemical Engineering, Seoul National University, San 56-1, Shillim-dong, Kwanak-gu, 151-742, Seoul, South Korea
J Hazard Mater. 2003 Aug 29;102(2-3):257-75. doi: 10.1016/s0304-3894(03)00209-7.
The removal of chromium from aqueous solution by an ion exchange resin is described. Ion exchange resins 1200H, 1500H and IRN97H show a remarkable increase in sorption capacity for chromium, compared to other adsorbents. The adsorption process, which is pH dependent show maximum removal of chromium in the pH range 2-6 for an initial chromium concentration of 10mg/l. The metal ion adsorption obeyed linear, Langmuir and Freundlich isotherms. The adsorption of chromium on these cation exchange resins follows first-order reversible kinetics and pseudo-first-order kinetics. The intraparticle diffusion of chromium on ion exchange resins represents the rate-limiting step. The uptake of chromium by the ion exchange resins was reversible and thus have good potential for the removal/recovery of chromium from aqueous solutions. We conclude that such ion exchange resins can be used for the efficient removal of chromium from water and wastewater.
描述了用离子交换树脂从水溶液中去除铬的过程。与其他吸附剂相比，离子交换树脂1200H、1500H和IRN97H对铬的吸附容量有显著提高。吸附过程依赖于pH值，对于初始铬浓度为10mg/l的情况，在pH值2 - 6范围内铬的去除率最高。金属离子吸附符合线性、朗缪尔和弗伦德利希等温线。铬在这些阳离子交换树脂上的吸附遵循一级可逆动力学和准一级动力学。铬在离子交换树脂上的颗粒内扩散是限速步骤。离子交换树脂对铬的吸收是可逆的，因此在从水溶液中去除/回收铬方面具有良好的潜力。我们得出结论，这种离子交换树脂可用于从水和废水中有效去除铬。
