石榴皮炭负载CaTiO3复合材料去除溶液中U(Ⅵ)的性能与机制
Performance and mechanism of U(Ⅵ)removal from solution by pomegranate peel carbon supported CaTiO3 composites
龚逸 1李小燕 1张益硕 1李琨 1李明哲 1曹小岗 1杜艳军 1刘波2
作者信息
- 1. 东华理工大学 江西省核辐射探测及应用工程研究中心,南昌 330013
- 2. 江西省辐射环境监督站,南昌 330013
- 折叠
摘要
当今社会能源短缺,核能发展迅速,为了实现绿色高效的能源利用目标,如何处理核能发展过程产生的含铀废物已成为日益突出的环境问题.本文首先采用溶剂热法制备CaTiO3 材料,然后通过与石榴皮炭材料混合研磨合成炭材料负载CaTiO3(C@CaTiO3),采用现代表征技术分析C@CaTiO3 与U(Ⅵ)反应前后形貌及物质组成变化.通过静态实验法研究了材料去除溶液中铀的性能.研究结果表明:在pH=3.5、U(Ⅵ)初始浓度为 25 mg·L-1、反应时间 40 min、温度为 25℃的条件下,材料对U(Ⅵ)的去除率为 96.26％,去除量为119.21 mg·g-1.通过吸附动力学模型、等温吸附模型和热力学模型,探究了C@CaTiO3 与U(Ⅵ)的反应机制.结果表明:C@CaTiO3 对U(Ⅵ)的吸附过程是自发进行的吸热反应,C@CaTiO3 对溶液中U(Ⅵ)的去除存在吸附和还原两种方式,吸附为物理吸附和化学吸附并存、以表面单层化学吸附为主.还原以光催化还原作用为主.
Abstract
In order to achieve the goal of green and efficient energy utilization,how to deal with uranium-contain-ing waste generated during the development of nuclear energy has become an increasingly prominent environ-mental problem.The CaTiO3 materials were initially prepared using the solvent-thermal method.Subsequently,the carbon material was synthesized by grinding a mixture of CaTiO3 and pomegranate peel carbon material,resulting in the formation of carbon-loaded CaTiO3(C@CaTiO3).Modern characterization techniques were employed to analyze the morphological and compositional changes of C@CaTiO3 before and after its reaction with U(Ⅵ).The performance of the material in removing uranium from the solution was evaluated using a static experimental method.The research findings revealed that,under the conditions of pH=3.5,an initial concentration of U(Ⅵ)of 25 mg·L-1,reaction time of 40 min,and temperature of 25℃,the material exhibited a U(Ⅵ)removal rate of 96.26％with a corresponding removal capacity of 119.21 mg·g-1.The reaction mechanism between C@CaTiO3 and U(Ⅵ)was investigated using adsorption kinetics models,isothermal adsorption models,and thermodynamic models.The results demonstrate that the adsorption process of U(Ⅵ)by C@CaTiO3 is a spontaneous endothermic reaction.The removal of U(Ⅵ)from the solution using C@CaTiO3 involved both adsorption and reduction,with physical and chemical adsorption coexisting and surface monolayer chemical adsorption being the predominant mechanism.Photocatalytic reduction played a major role in the reduction process.
关键词
炭材料/钛酸钙/复合材料/铀/去除/吸附Key words
carbon material/CaTiO3/composites/uranium/removal/adsorption引用本文复制引用
基金项目
国家自然科学基金(41761090)
国家自然科学基金(12105044)
江西省东华理工大学研究生创新基金(YC2022-s614)
出版年
2024
NETL
NSTL
万方数据