摘要
Lead-loaded modified spent grain regenerated by desorption process was investigated.HCl,H2SO4,H3PO4,NaOH,NaCl and ultrapure water were chosen as desorption agents to treat lead-loaded modified spent grain for 30 min.The structures and components of regenerated modified spent grain before and after adsorbing Pb(Ⅱ)were investigated using scanning electron microscopy(SEM),energy-dispersive analysis of X-ray(EDAX)and Fourier transform infrared spectrometry(FTIR).The results indicate that lead-loaded modified spent grain treated in 0.1 mol/L HCl exhibits higher elution efficiency(86.44%)as compared with other agents.The enrichment of carboxyl and hydroxyl groups susceptible to combine with Pb(Ⅱ)are observed in the regenerated modified spent grain,which may result in high re-absorption efficiency of Pb(Ⅱ).Moreover,C-Cl,N-H,C-N and O-H (polysaccharides)also play an crucial role in Pb(Ⅱ)binding to regenerated modified spent grain.
Lead-loaded modified spent grain regenerated by desorption process was investigated. HCI, H2SO4, H3PO4, NaOH, NaCl and ultrapure water were chosen as desorption agents to treat lead-loaded modified spent grain for 30 min. The structures and components of regenerated modified spent grain before and after adsorbing Pb（Ⅱ） were investigated using scanning electron microscopy（SEM）, energy-dispersive analysis of X-ray（EDAX） and Fourier transform infrared spectrometry（FTIR）. The results indicate that lead-loaded modified spent grain treated in 0.1 mol/L HCI exhibits higher elution efficiency （86.44%） as compared with other agents. The enrichment of carboxyl and hydroxyl groups susceptible to combine with Pb（Ⅱ） are observed in the regenerated modified spent grain, which may result in high re-absorption efficiency of Pb（Ⅱ）. Moreover, C-Cl, N-H, C N and O-H （polysaccharides） also play an crucial role in Pb（ Ⅱ ） binding to regenerated modified spent grain.
出处
《中国有色金属学会会刊：英文版》
EI
CSCD
2009年第5期1371-1376,共6页
Transactions of Nonferrous Metals Society of China
基金
Project(2007BAC25B01)supported by the National Key Project of Science and Technology Supporting Programs of China
Project(50830301)supported by the Key Scientific and Technical Project of Ministry of Education of China
