Untreated Chinese ephedra residue as biosorbents for the removal of Pb2+ ions from aqueous solutions
The objective of this work was to propose an alternative use for ephedra residue (ER) as untreated biosorbents for the removal of Pb2+ ions from aqueous solutions.Biosorption studies were conducted as a function of the solution pH,contact time and initial metal ion concentration.The biosorption kinetics was determined by fitting second-order kinetic models to the experimental data,being described by the pseudo-second-order model (R2 > 0.99).Both Langrnuir and Freundlich sorption models fit the experimental sorption equilibrium data,with Langmuir providing the best fit (R2 >0.97).According to the Langmuir equation,the maximum uptake capacity for Pb2+ ions was 1.0 mmol/g at 298K.A comparison of the maximum sorption capacity of several untreated biomaterial-based residues showed that the ER is a suitable candidate for use as biosorbents in the removal of Pb2+ ions from aqueous solutions.
Ephedria residue Pb2+ ions Biosorption Isotherms Kinetics
Ningchuan Feng Fengyuan Zhang
School of Basic Medical Science, Ningxia Medical University, Yinchuan 750004, China
国际会议
2013 International Symposium on Environmental Science and Technology(2013环境科学与技术国际会议)
大连
英文
637-641
2013-06-04（万方平台首次上网日期，不代表论文的发表时间）