钒掺杂氧化钨对锶吸附性能的研究

摘要

90 Sr is the important fission element that existed in radioactive wastewater,which can potentially pose a serious threat to human health.Thus,safe disposal of radioactive strontium is necessary and crucial.Hexagonal tungsten oxide(h-WO3)has potential application to deal with radioactive waste.However,it has shown low adsorption ability for removal of 90Sr from aqueous solution.V-doped WO3were synthesized using a hydrothermal method.Incorporation of V5+into the WO3framework leads to expansion of the layer spacing and is accompanied by the exclusion of guest water molecules,which have been characterized by various kinds of tech-nologies in detail.When compared to bare h-WO3,the adsorption capacity of Sr2+on V-doped WO3is obviously improved,and the maximum adsorption capacity,is 57.57 mg·g-1for Sr2+at pH=6.0.Parameters,such as pH,adsorbent content,contact time,tem-perature,co-exist ions and Sr2+initial concentration,could influence the Sr2+adsorption capacity on V doped WO3,were systemati-cally investigated,and the results show that V-doped WO3can efficiently remove Sr2+from aqueous solution at p H=5-8.%90Sr是放射性废液中重要的裂变核素,也是放射性废液中的主要释热核素,因此安全有效地将高放废液中90Sr分离出来是减少废液放射性强度的主要手段.在前期的研究发现六方相氧化钨对90Sr具有一定的吸附性能,但吸附容量较低.拟向六方相氧化钨中掺杂过渡金属改变局域结构提高吸附性能,实验中采用水热法将过渡金属钒引入六方相氧化钨结构中,结果表明钒掺杂可引起六方相氧化钨层间距增加,比表面积增大.吸附实验结果表明掺杂钒后氧化钨对锶的吸附性能明显提高,由Langmuir等温吸附模型可知最大吸附容量为57.57mg·g-1.研究了pH值、初始浓度、吸附时间、温度、固液比、离子强度等因素对吸附性能的影响.材料在pH=5-8时对Sr2+有较好的吸附性能.