文献类型：期刊文献

中文题名：改性板栗壳CACS对Cr(Ⅲ)的吸附性能

英文题名：Adsorption behaviors of modified chestnut shell CACS on Cr(Ⅲ)

作者：曾力丁[1];张慧[2,3];莫铭恩[3,4];吴惠瑾[3]

机构：[1]华东理工大学机械与动力工程学院,上海200237;[2]华东理工大学科技信息研究所,上海200237;[3]广西环境污染控制理论与技术重点实验室,桂林541004;[4]浩蓝环保股份有限公司,广州510630

年份：2016

卷号：10

期号：2

起止页码：697

中文期刊名：环境工程学报

外文期刊名：Chinese Journal of Environmental Engineering

收录：CSTPCD;;Scopus;北大核心:【北大核心2014】；CSCD:【CSCD2015_2016】；

基金：广西教育厅资助项目(201012MS097);广西科学研究与技术开发计划应用基础研究专项(桂科攻1140002-3-2)

语种：中文

中文关键词：柠檬酸;板栗壳;吸附;铬

外文关键词：critic acid; chestnut shell; adsorption; Cr（Ⅲ）;

摘要：以板栗壳为原料,经过柠檬酸改性后制备成重金属吸附材料CACS,通过考察初始p H值、吸附剂投加量等因素对模拟废水中Cr(Ⅲ)去除率的影响,以及吸附动力学过程和等温吸附特征,分析探讨CACS对水中Cr(Ⅲ)的吸附特性及吸附机理。结果表明,p H为4.0,吸附剂投加量为1 g/L时,CACS对Cr(Ⅲ)的饱和吸附容量达33.4 mg/g;与未改性板栗壳CS相比,吸附容量提高了49.5%;吸附过程符合准二级动力学模型,表明吸附速率受化学吸附控制,吸附等温规律遵从Langmuir模型,表明吸附过程主要是表层吸附;结合吸附前后的扫描电镜(SEM)和傅里叶红外光谱(FTIR)的图谱分析,推断改性板栗壳CACS对Cr(Ⅲ)的吸附存在表面吸附、静电引力、络合和离子交换作用,而羟基和羧基与Cr(Ⅲ)发生配位作用可能是吸附量提高的主要原因。
In this study,chestnut shell modified by citric acid was used as adsorbent to remover Cr（ Ⅲ）from aqueous solution. Effects of various parameters,including the p H,the dose of adsorbent,the initial metal concentration,models for adsorption isothermal process and adsorption kinetics / thermodynamic were investigated to determine the optimal conditions for Cr（ Ⅲ） removal. The result indicated that under the conditions of p H 4. 0and modified chestnut shell dosage of 1 g / L,adsorption capacities of CACS reached 33. 4 mg / g. Compared with the unmodified chestnut shell CS,adsorption capacity of CACS on Cr（ Ⅲ） increased by 49. 5%. The adsorption process could be fitted with the pseudo-second kinetic model and isothermal adsorption behavior can be described by Langmuir equation,which implying that the adsorption rate was controlled by chemical adsorption and surface adsorption occurred. Based on the FTIR and SEM spectrum,it is found that surface adsorption,electrostatic attraction,complexation and ion exchange between the CACS and Cr（ Ⅲ） contributed to the adsorption,the main reason for improving the Cr（ Ⅲ） adsorption quantity by CACS may be the coordination effect between hydroxyl,carboxylic groups and Cr（ Ⅲ）.