摘要
以柠檬酸为改性剂对木薯秸秆进行改性制备阳离子吸附剂。以铜离子去除率作为评价吸附剂吸附性能指标,对制备最佳条件进行了优化,利用FT-IR、SEM、Zeta电位和X衍射技术对制备的吸附剂进行了结构表征,考察了对铜离子吸附过程动力学和等温吸附规律。实验结果表明:最佳的改性反应物(木薯秸秆∶柠檬酸)剂量比为1 g∶7.2×10^(-3)mol,反应温度为120℃,反应时间30 min;表征结果证明了改性吸附剂中羧基的存在;柠檬酸改性木薯秸秆吸附剂能够快速吸附重金属铜离子,吸附过程符合准二级动力学模型;吸附等温线符合Langmuir模式,饱和吸附量达到2.19 mmol/g。证明柠檬酸改性木薯秸秆吸附剂是一种潜在的重金属废水处理剂。
A new cationic adsorbent was prepared from cassava stalk（CS） after reaction with citric acid. The preparation condition were optimized using the removal rate of copper as the evaluation criterion for adsorption capability. The synthesized adsorbent was characterized by FT-IR,SEM,Zeta potential,and X diffraction to determine their applicability in Cu^2＋ binding. The sorption process kinetics and isotherm of Cu^2＋ onto the sorbent were examined. The optimized parameters were as follows： Reaction temperature was 120 ℃,reaction time was 30 min,and the reaction ratio was cassava stalk： citric acid = 1 g： 7. 2 ×1^-3 mol. The characterization results indicated the existence of grafted carboxyl group in the structure of the adsorbent. The sorbent could quickly adsorb Cu^2＋ and the sorption process followed the pseudo-second order kinetic model well. The isothermal data fitted the Langmuir model with the maximum adsorption capacity of 2. 19 mmol/g. It was proposed that the adsorbent can be potential solution for heavy metal removal from aqueous solution.
出处
《环境工程》
CAS
CSCD
北大核心
2017年第11期138-142,共5页
Environmental Engineering
基金
国家自然科学基金(21267005)
桂林市科技开发项目(20130117-1)
桂林市科技开发项目(20140106-9)
岩溶生态与环境变化研究广西高校重点实验室(YRHJ15Z004)
广西自然科学基金(2010GXNSFA013008)
