石榴皮炭负载CaTiO_(3)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 CaTiO_(3) composites

作　　者：龚逸 李小燕[1] 张益硕 李琨 李明哲 曹小岗 杜艳军[1] 刘波 GONG Yi;LI Xiaoyan;ZHANG Yishuo;LI Kun;LI Mingzhe;CAO Xiaogang;DU Yanjun;LIU Bo(Jiangxi Province Nuclear Radiation Detection and Application Engineering Research Center,East China University of Technology,Nanchang 330013,China;Jiangxi Province Radiation Environment Supervision Station,Nanchang 330013,China)

机构地区：[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

出　　处：《复合材料学报》2024年第3期1327-1337,共11页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(41761090,12105044);江西省东华理工大学研究生创新基金(YC2022-s614)。

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CaTiO_(3)材料,然后通过与石榴皮炭材料混合研磨合成炭材料负载CaTiO_(3) (C@CaTiO_(3)),采用现代表征技术分析C@CaTiO_(3)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@CaTiO_(3)与U(VI)的反应机制。结果表明:C@CaTiO_(3)对U(VI)的吸附过程是自发进行的吸热反应,C@CaTiO_(3)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。In order to achieve the goal of green and efficient energy utilization,how to deal with uranium-containing waste generated during the development of nuclear energy has become an increasingly prominent environmental problem.The CaTiO_(3) materials were initially prepared using the solvent-thermal method.Subsequently,the carbon material was synthesized by grinding a mixture of CaTiO_(3) and pomegranate peel carbon material,resulting in the formation of carbon-loaded CaTiO_(3)(C@CaTiO_(3)).Modern characterization techniques were employed to analyze the morphological and compositional changes of C@CaTiO_(3) 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) of25 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@CaTiO_(3) 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@CaTiO_(3) is a spontaneous endothermic reaction.The removal of U(VI) from the solution using C@CaTiO_(3) 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 

分 类 号：X591[环境科学与工程—环境工程] TB332[一般工业技术—材料科学与工程]