摘要
以羧基型、氨基磷酸型和氨基二乙酸型阳离子交换树脂(D113,D412及D751)为载体,制备了3种载铝树脂(Al-D113,Al-D412及Al-D751),并进行酸碱稳定性、氟吸附性能比较,筛选出Al-D412。考察了pH及温度对Al-D412除氟效果的影响,测量不同温度下的氟吸附等温线,并对D412树脂进行载铝、除氟前后的电镜能谱分析和红外表征。结果表明,pH对吸附剂除氟有较大影响,在最佳条件下(pH为5,温度为40℃)Al-D412的氟饱和吸附量达到191.6 mg·g^-1。热力学数据表明吸附过程符合Langmuir模型,是自发的吸热反应。
Three types of cation exchange resins,carboxyl cation exchange resin,phosphoramidic resin,and imino-diacetate resin,were employed in this work to exchange with Al3+cation to prepare Al-loaded resins Al-D113,Al-D412,and Al-D751,respectively.The pH stability and defluorination capacity of these three Al loaded resins were compared.Based on the test results,Al-D412 resin was selected to remove fluoride ions from solution.The impact of the pH value and temperature on defluorination of Al-D412 was investigated,and the structure of Al-D412 before and after Al3+loading and defluorination was analyzed by FTIR and SEM-EDS.Our results show that different pH values had a considerable influence on the defluorination capacity of Al-D412.And the maximum loading of F-is 191.6 mg·g^-1 under optimum conditions(a solution pH value of 5 at temperature of 40℃).The fluoride adsorption result was explained using the Langmuir isotherms,with which the calculated thermodynamic parameters demonstrate that the fluoride adsorption is spontaneous and endothermic.
作者
黄颖
周康根
HUANG Ying;ZHOU Kang-gen(School of Metallurgy and Environment, Central South University, Changsha 410012, China)
出处
《湖南师范大学自然科学学报》
CAS
北大核心
2020年第4期63-68,共6页
Journal of Natural Science of Hunan Normal University
基金
湖南省科技重大专项课题(2009FJ1009-3)。
关键词
吸附剂
除氟
螯合树脂
铝负载
adsorbents
fluoride removal
chelating resin
Al-loaded
作者简介
通信作者:周康根,E-mail:1541937166@qq.com。
