期刊
CHEMICAL ENGINEERING JOURNAL
卷 150, 期 1, 页码 139-144出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2008.12.014
关键词
Molecular imprinting; Ag+; Adsorption; Desorption; Waste-water treatment; Affinity
资金
- National Natural Science Foundation of China [20325622, 50373003, 20876008]
- national Basic Research Program (973 Program) of China [2007CB714305]
- (863) High Technology [2006AA020101]
Using the surface molecular imprinting technology, the Ag+-imprinted biosorbent for treatment of the wastewater contaminated by Ag+ was prepared, which showed higher adsorption affinity and selectivity for the imprinting ion (Ag+) than the other non-imprinting metal ions. Batch adsorption experiments were carried out as a function of imprinted Ag+ concentration, agitation time, temperature and initial Ag+ concentration. The optimal imprinted Ag+ concentration for preparing Ag+-imprinted biosorbent was 2.0 mg/g (biomass). The maximum adsorption capacity was 199.2 mg/g at the initial Ag+ concentration of 1200.0 mg/L and the biosorbent dosage of 3.0 g/L, which was much higher than that of previous work. The reaction temperature showed little effect on the adsorption process. The biosorbent could be easily desorbed by using 0.1 M Na2S2O3 solution as a desorbent at room temperature (25.0-27.0 degrees C). The SEM showed that noble metal silver could be well adsorbed by the biosorbent: the silver nanoparticles were of regular geometry shape and relatively uniform. (C) 2008 Elsevier B.V. All rights reserved.
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