皂化交联改性橘子皮生物吸附剂对Cu^(2+)的吸附  

Adsorption of Cu^(2+) by saponified and cross-linked orange peel

作　　者：冯宁川[1,2] 郭学益[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 [2]宁夏医学院基础学院,宁夏银川750004

出　　处：《中南大学学报（自然科学版）》2009年第4期857-862,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：以生物废料橘子皮(OP)为原料,经乙醇、氢氧化钠和氯化钙处理,得到2种改性橘子皮生物吸附剂SOP和SCOP,并将它们用于对Cu2+的吸附。研究溶液pH值、吸附剂用量、吸附时间和Cu2+初始质量浓度对SOP和SCOP吸附性能的影响。结果表明:Cu2+在橘子皮生物吸附剂上的吸附速率快,可以用准二级动力学方程描述。SOP和SCOP对Cu2+的吸附等温线符合Langmuir模型,根据Langmuir模型计算SOP和SCOP饱和吸附量,分别为50.17mg/g和72.73mg/g,高于未改性的OP饱和吸附量(44.28mg/g)。改性后的橘子皮生物吸附剂可以再生重复使用5次以上。橘子皮经过改性处理后,化学稳定性提高,吸附能力增强,是性能良好的Cu2+吸附剂。Two kinds of biosorbents （SOP and SCOP） were prepared by treating orange peel （OP） with ethanol, sodium hydroxide and calcium chloride and were used to adsorb Cu^2＋ from aqueous solution. Equilibrium isotherms and kinetics were obtained and the effects of solutions pH, biosorbent dosage, adsorption time and initial Cu^2＋ concentration were studied in batch experiments. Equilibrium was well described by Langmuir isotherms and kinetics was found to fit pseudo-second order type adsorption kinetics. According to the Langmuir equation, the maximum adsorption capacities of SOP and SCOP for Cu^2＋ are 50.17 and 72.73 mg/g, respectively, which are higher than untreated OP （40.28 mg/g）. The loaded biosorbent is regenerated using HCl solution and can be used repeatedly for five times with little loss of adsorption capacity. The results show that additional chemical treatments of the orange peel by ethanol, sodium hydroxide and calcium chloride increase the adsorption capacity of Cu^2＋.

关 键 词：橘子皮 CU2+ 化学改性 吸附 

分 类 号：X703.1[环境科学与工程—环境工程]