罗非鱼鱼鳞对水中Cd^(2+)的吸附

Adsorption of cadmium ion by Tilapia scales

通过红外光谱、BET、吸附动力学和吸附等温线分析鱼鳞吸附机理,考察Cd^(2+)初始质量浓度和溶液pH等对罗非鱼鱼鳞吸附水中Cd^(2+)性能的影响。结果表明,优化吸附条件:吸附剂2 g/L,pH为3~7,298 K,吸附平衡时间60 min;动力学研究得到的最大吸附容量达159 mg/g;另外,鱼鳞对Cd^(2+)的吸附过程符合Lagergren准二级动力学模型,吸附等温线符合Langmuir吸附等温式。

The adsorption mechanism of Tilapia scale were analyzed by Fourier transform infrared spectroscopy,BET,adsorption kinetics and isotherms.The effects of the initial mass concentration of Cd^(2+) and pH on the adsorption capacity were studied.The results showed that the best absorption conditions were as follows:adsorbent 2 g/L,pH 3~7,298 K,adsorption equilibrium time 60 min.The maximum adsorption capacity of Cd^(2+) was 159 mg/g based on adsorption isotherm study.In addition,the adsorption process of Cd^(2+) on fish scales was in accordance with the Lagergren quasi second order kinetic model,and the adsorption isotherm was in accordance with the Langmuir adsorption isotherm.