Adsorption of hexavalent chromium onto Bamboo Charcoal grafted by Cu2+-N-aminopropylsilane complexes: Optimization, kinetic, and isotherm studies

作者：Wu, Yunhai^*; Ming, Zhu; Yang, Shengxin; Fan, Yiang; Fang, Peng; Sha, Haitao; Cha, Ligen

来源：Journal of Industrial and Engineering Chemistry, 2017, 46: 222-233.

DOI：10.1016/j.jiec.2016.10.034

• Bamboo charcoal
• Cr(VI)
• Response surface methodology
• Adsorption

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 after modification 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 pH(pzc) 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 (R-2 = 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).

• 出版日期2017-2-25
• 单位河海大学