ADSORPTION OF Pb2+ FROM AQUEOUS SOLUTIONS BY TWO MODIFIED ORANGE PEEL ADSORBENT
In this study, two modified orange peel adsorbents: SOP (modified by NaOH) and SCOP (modified by NaOH+CaCl2) were prepared. The adsorption conditions including pH value, metal ion concentration, adsorption time, temperature and coexist metal ions on the Pb2+adsorption by SOP and SCOP were investigated. Based on the experimental results, for both SOP and SCOP, the adsorption processes could attain equilibrium within 20 minutes and kinetics are well fitted by pseudo-second-order equation; adsorption isotherms are found to fit Langmuir model better than Freudlich model and the maximum Pb2+adsorption capacities by SOP and SCOP are obtained as 185.2 and 208.3 mg/g, respectively. Temperature show negative effect on Pb2+adsorption by SOP and SCOP and related thermodynamic parameters, the standard free energy (□G0), enthalpy change (□H0) and entropy change (□S0) are calculated. Coexist metal ions (K+, Na+, Ca2+, Mg2+) have little effect on the Pb2+adsorption by SOP and SCOP.
modified orange peel adsorbent adsorption Pb2+
S. LIANG X.Y. GUO Q.H. TIAN
School of Metallurgy Science and Technology, Central South University, Changsha, China, 410083
国际会议
北京
英文
665-670
2010-05-17（万方平台首次上网日期，不代表论文的发表时间）