화학공학소재연구정보센터
Journal of Industrial and Engineering Chemistry, Vol.46, 222-233, February, 2017
Adsorption of hexavalent chromium onto Bamboo Charcoal grafted by Cu2+-N-aminopropylsilane complexes: Optimization, kinetic, and isotherm studies
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The adsorption mechanism of Cr(VI) uptake onto Bamboo Charcoal grafted by Cu2+-N-aminopropylsilane complexes (BC/Cu-N) was investigated. The properties of BC/Cu-N were characterized using XRD, FTIR, SEM, EDS, potentiometric acid.base titration and electrochemical analysis. Results indicated that the framework integrity of BC was kept aftermodification and the quantity of functional groups on BC/Cu-N surface has changed. There existed functional groups on the BC/Cu-N which could consume OH- and the pHpzc was found to be 6.20. Moreover, electrochemical analysis showed that new electron transfer pathway was imported. Parameters such as pH, initial Cr(VI) concentration, adsorbent dosage and temperature were optimized using RSM. Analysis of variance of the quadratic model for Cr(VI) was suitable to predict the adsorption of Cr(VI) (F value = 134.23 and P value < 0.001) with a high correlation (R2 = 0.9921). The results showed that the initial Cr(VI) concentration and the adsorption capacity of Cr(VI) were positively related. Adsorption data of Cr(VI) were better fitted by Sips, Temkin and D-R models with the maximum adsorption capacity of 17.9383 mg/g. In addition, the pseudo second-order kinetic model was found to be more suitable for the adsorption of Cr(VI).