【摘 要】
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Lead-loaded modified spent grain regenerated by desorption process was investigated. HCl, H_2SO_4, H_3PO_4, NaOH, NaCl and ultrapure water were chosen as desorp
【机 构】
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School of Metallurgical Science and Engineering
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Lead-loaded modified spent grain regenerated by desorption process was investigated. HCl, H_2SO_4, H_3PO_4, 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.
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