硫酸改性麻黄草废渣生物吸附剂对Pb^(2+)的吸附  

ADSORPTION OF Pb^(2+) BY SULFURIC ACID-MODIFIED CHINESE EPHEDRA RESIDUE

作　　者：吕大雷[1] 温宏春 冯宁川[1] 

机构地区：[1]宁夏医科大学基础医学院,银川750004 [2]宁夏银川市第三人民医院,银川750001

出　　处：《环境工程》2014年第1期50-54,共5页Environmental Engineering

基　　金：宁夏自然科学基金资助项目(NZ1083)

摘　　要：以麻黄草废渣(ER)为原料,经硫酸改性制备了改性麻黄草废渣生物吸附剂(SER),并将其用于水溶液中Pb2+的吸附。考察了溶液pH值、吸附时间、Pb2+初始浓度和温度对SER吸附性能的影响,研究了SER对Pb2+的吸附动力学和吸附热力学特性。结果表明:Pb2+离子在该吸附剂上吸附速率快,吸附过程符合准二级动力学方程;随溶液中Pb2+离子浓度增加,吸附量增大,等温吸附过程符合Langmuir模型,根据Langmuir模型计算SER在298K时对Pb2+的饱和吸附量为1.85 mmol/g,高于改性前(1.0 mmol/g)。热力学参数ΔG<0、ΔH<0、ΔS>0,证实了吸附过程为自发的放热过程。SER对Pb2+的吸附性能优良,具有潜在的应用前景。A biosorbents （SER） was prepared by treating ephedra residue （ER） with sulfuric acid and used to adsorb Pb^2＋ from aqueous solution. Biosorption studies were conducted on function of the solution pH, reaction time, temperature and initial metal ion concentration on the performance and adsorption kinetics and thermodynamics characteristics were evaluated. The adsorption rate is guite high and kinetics was found to fit pseudo-second order kinetic models. The equilibrium could be well described by Langmuir equation with the maximum adsorption capacity （qm） for Pb^2＋ was 1.85 mmol/g at 298K. Thermodynamic parameters, the change of free energy （ AG）, enthalpy （AH） and entropy （AS） of the biosorption were also calculated. The results showed that the biosorption process of Pb^2＋ onto SER biomass was feasible, spontaneous and exothermic. The results suggest that modified ephedra residue have high possibility to be used as effective and economical biosorbent for removal of Pb^2＋.

关 键 词：麻黄草废渣 改性 PB^2+ 生物吸附 

分 类 号：X703[环境科学与工程—环境工程]