溶胶-凝胶法合成Ti-Fe复合物及其铀(Ⅵ)吸附性能  

Uranium(Ⅵ)Adsorption Properties of Ti-Fe Composites prepared via Sol-Gel method

作　　者：丁玲 张帅[1] 郑博文 党振华 张林[1] DING Ling;ZHANG Shuai;ZHEN Bowen;DANG Zhenhua;ZHANG Lin(Division of Target Science and Fabrication,Research Center of Laser Fusion,China Academy of Engineering Physics,P.O.Box 919-987,Mianyang 621900,Sichuan,China)

机构地区：[1]中国工程物理研究院激光聚变研究中心靶材科学与制造研究室,四川绵阳621900

出　　处：《硅酸盐学报》2024年第8期2674-2684,共11页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(51803198);中国工程物理研究院院长基金(51803198)。

摘　　要：TiO_(2)基材料以其优异的化学稳定性、光稳定性、无毒性、低成本等优点被广泛应用于铀吸附。虽然TiO_(2)基材料在铀吸附领域有一定的研究,但其铀吸附性能仍不理想。为了提高TiO_(2)基材料对铀(Ⅵ)的吸附能力,本工作采用溶胶凝胶法制备了掺杂铁的纳米TiO_(2)材料(Ti-Fe复合物),并将其用于废水中铀(Ⅵ)的分离。Ti-Fe复合物对铀(Ⅵ)的吸附效率在60 min内达到平衡,吸附效率为94.5%,最大吸附容量为672.9mg/g。等温模型和动力学模型表明,Ti-Fe复合物对铀(Ⅵ)的吸附为单层均匀的化学吸附。通过X射线光电子能谱分析了铀(Ⅵ)与Ti-Fe复合物的相互作用机理,主要包括氧空位填充、氧化还原作用和球内表面络合作用。Ti-Fe复合物有望应用于实际处置含铀(Ⅵ)废水。Introduction In recent years,the pollution of radionuclides to water is becoming more and more serious with the rapid development of nuclear technology.The expansion of activities,such as uranium mining,nuclear research,weapon manufacturing,and nuclear power generation will produce many radioactive isotopes.Among these radionuclides,uranium(Ⅵ)(U(Ⅵ))poses a great threat to the biosphere due to the enhanced chemical affinity with organic ligands,radioactive toxicity and long half-life.Therefore,it is necessary to develop a technology to reduce or recover U(Ⅵ)in wastewater for decreasing the risk of U(Ⅵ)pollution to the environment and realizing the resource utilization of U(Ⅵ).The adsorption method has been widely studied due to the relatively mature technology,good repeatability of adsorbent,high adsorption efficiency,low cost and easy operation.Titanium dioxide(TiO_(2))is considered one of the best adsorbents due to the low cost,non toxicity and high chemical activity.However,the agglomeration of TiO_(2) particles will reduce the number of active sites per unit area,leading to a weakened adsorption ability for U(Ⅵ).An effective strategy to improve the adsorption ability is to prevent the aggregation of TiO_(2) particles and improve the surface activity of TiO_(2).Therefore,in this work,iron doped nano-TiO_(2) materials(Ti-Fe composites)were prepared by the sol gel method,aiming to prevent the aggregation of TiO_(2) particles in use and improve the adsorption performance.Methods Tetrabutyl titanate(Ci_(6)H_(36)O_(4)Ti,98%),ethanol(C_(2)H_(6)O,99%),ethylene glycol(CH_(2)OH)_(2),99%),hydrochloric acid(HCI,36%),anhydrous ferric chloride(FeCl_(3),≥99.9%),triazo arsine(II)(C_(22)H_(18)As_(2)N_(4)O_(14)S_(2),99.9%)and uranyl nitrate(UO_(2)(NO_(3))_(2)·6H_(2)O,98%)were purchased from Aladdin's reagent.TiO_(2) and Ti-Fe composites were synthesized by sol gel freeze drying technology.Firstly,3 mL of Ci_(6)H_(36)O_(4)Ti was added to 15 mL of C_(2)HO to obtain a transparent mixture.Secondly,FeCl_(3)(100 mg)was

关 键 词：钛-铁复合物 吸附 铀(Ⅵ) 溶胶-凝胶 

分 类 号：TQ424[化学工程]