改性柿子粉吸附剂对Cd^(2+)的吸附性能  

Adsorption of Cd^(2+) by chemically modified persimmon powder

作　　者：郭学益[1] 肖彩梅[1] 梁莎[1] 田庆华[1] 

机构地区：[1]中南大学冶金科学与工程学院,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2012年第2期412-417,共6页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(50774100)

摘　　要：以柿子粉为基体,经丙酮和硫酸缩合改性处理制备柿子生物吸附剂,并对柿子生物吸附剂和原始柿子粉进行红外光谱分析,考察柿子生物吸附剂吸附Cd2+的影响因素如初始pH、温度、时间等,研究吸附动力学、等温吸附模型以及吸附剂的循环再生性能。研究结果表明:改性处理增加了对重金属离子有吸附作用的活性官能团数目并降低了柿子粉的水溶性;柿子生物吸附剂对Cd2+的吸附过程可以很好地用准二级动力学方程描述;吸附等温线均符合Langmuir和Freundlich方程;改性柿子生物吸附剂对Cd2+的最大吸附量为82.78 mg/g。Persimmon powder was chemically modified by acetone and sulfuric acid to obtain a persimmon absorbent.The absorbent and original persimmon powder were characterized by infrared spectroscopy.The effects of various parameters like initial solution pH,temperature and reaction time on adsorption efficiencies of Cd^2＋ were studied.Adsorption kinetics,equilibrium isotherm and adsorbent recycling were also investigated.The results show that the modification increases the number of active functional groups for binding heavy metal ions and reduces the solubility of original persimmon powder.The adsorption process follows a pseudo-second order equation.The experimental isotherm data fit well both in the Langmuir and Freundlich equations.Maximum adsorption capacity of Cd^2＋ on the chemically modified persimmon absorbent is 82.78 mg/g.

关 键 词：柿子粉 化学改性 Cd2+ 生物吸附 

分 类 号：X703.1[环境科学与工程—环境工程]