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首页> 外文期刊>Journal of industrial and engineering chemistry >Adsorption of hexavalent chromium onto Bamboo Charcoal grafted by Cu2+-N-aminopropylsilane complexes: Optimization, kinetic, and isotherm studies
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Adsorption of hexavalent chromium onto Bamboo Charcoal grafted by Cu2+-N-aminopropylsilane complexes: Optimization, kinetic, and isotherm studies

机译：Cu2 + -N-氨基丙基硅烷配合物接枝到竹炭中六价铬的吸附：优化，动力学和等温研究

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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 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). (C) 2016 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
机译：研究了Cr（VI）吸收在Cu 2 + -N-氨基丙基硅烷配合物（BC / Cu-N）接枝到竹炭上的吸附机理。使用XRD，FTIR，SEM，EDS，电位酸基滴定和电化学分析表征BC / Cu-N的性质。结果表明，在修饰后，BC的框架完整性和BC / Cu-N表面上的官能团的数量变化。可以在可以消耗OH-和pH（PCZC）的BC / Cu-N上存在官能团。此外，电化学分析表明，进口了新的电子转移途径。使用RSM优化诸如pH，初始Cr（VI）浓度，吸附剂剂量和温度等参数。 CR（VI）二次模型的变化分析适用于预测Cr（VI）（F值= 134.23和P值<0.001）的吸附具有高相关（R-2 = 0.9921）。结果表明，初始Cr（VI）浓度和Cr（VI）的吸附能力呈正相关。 CR（VI）的吸附数据由啜饮，Temkin和D-R模型更好地装配，最大吸附容量为17.9383 mg / g。此外，发现伪二阶动力学模型更适合于Cr（VI）的吸附。 （c）2016年韩国工程和工程化学学会。 elsevier b.v出版。保留所有权利。

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