磷钨酸铵复合材料对铷铯吸附性能的研究
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摘要
针对卤水中铷、铯富集困难的问题,以磷钨酸铵为原料,通过与焦磷酸钛复合制备了一种新型吸附材料——磷钨酸铵-焦磷酸钛复合材料,用于吸附铷、铯离子。研究了复合材料对铷、铯离子的吸附过程热力学、动力学性能。动力学和热力学研究发现,准二级动力学方程和Freundlich吸附等温方程能较好地拟合吸附过程,相关性良好;热力学研究发现,ΔG~0、ΔH~0、ΔS~0均小于零,铷、铯在复合吸附剂上的吸附是自发进行的,复合吸附剂吸附铷、铯均为放热反应,升高温度不利于吸附的进行,吸附过程中固液界面的混乱度减小,是熵减过程。
In order to solve the problem of rubidium and cesium enrichment in brine,a new adsorbent material,ammonium phosphotungstate-titanium pyrophosphate composite,was used for adsorbing rubidium ions and cesium ions,the new adsorbent material was prepared by ammonium phosphotungstate compounded with titanium pyrophosphate.The thermodynamics and kinetics of the adsorption process of rubidium and cesium ions on composites were studied.It found that the quasi-secondorder kinetic equation and the Freundlich adsorption isotherm equation can fit the adsorption process well and the correlation was good through the kinetics and the thermodynamic study.It also found that ΔG~0、ΔH~0、ΔS~0 were all less than zero and the adsorption of rubidium and cesium on the composite adsorbent was spontaneously carried out.The adsorption of ruthenium and osmium by the composite adsorbent was an exothermic reaction.The increase of temperature was not conducive to the adsorption,and the chaos of the solid-liquid interface was reduced during the adsorption process,which was an entropy reduction process.
In order to solve the problem of rubidium and cesium enrichment in brine,a new adsorbent material,ammonium phosphotungstate-titanium pyrophosphate composite,was used for adsorbing rubidium ions and cesium ions,the new adsorbent material was prepared by ammonium phosphotungstate compounded with titanium pyrophosphate.The thermodynamics and kinetics of the adsorption process of rubidium and cesium ions on composites were studied.It found that the quasi-secondorder kinetic equation and the Freundlich adsorption isotherm equation can fit the adsorption process well and the correlation was good through the kinetics and the thermodynamic study.It also found that ΔG~0、ΔH~0、ΔS~0 were all less than zero and the adsorption of rubidium and cesium on the composite adsorbent was spontaneously carried out.The adsorption of ruthenium and osmium by the composite adsorbent was an exothermic reaction.The increase of temperature was not conducive to the adsorption,and the chaos of the solid-liquid interface was reduced during the adsorption process,which was an entropy reduction process.
引文
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[2]宝阿敏,钱志强,郑红,等.铷、铯的分离提取方法及其研究进展[J].应用化工,2017,46(7):1377-1382.
[3]孙兆祥,徐东余.焦磷酸钛-磷钼酸铵新型复合无机离子交换剂的研究[J].北京师范大学学报:自然科学版,1991,27(3):339-343.
[4]安莲英,赵琳,黄献奖,等.磷钨酸铵-海藻酸钙复合吸附剂分离铷钾工艺研究[J].矿物岩石,2015,35(3):1-5.
[5]顾亚军,殷伯海.焦磷酸钛的合成、性能及其在金属离子分离中的应用[J].离子交换与吸附,1992(3):217-221.
[6]刘珊.粗粒磷钼酸铵及其复合物对铷/铯离子的选择性吸附研究[D].长沙:湖南大学,2012.
[7]尉松盛.用原子吸收光谱测定强放废液中的铷和铯[J].原子能科学技术,1991,25(6):53-59.
[8]姜志新.离子交换动力学及其应用(上)[J].离子交换与吸附,1989,5(1):54-73.
[9]仇欢,姜伟立,刘福强,等.树脂吸附法分离去除阿斯巴甜缩合母液中L-苯丙氨酸的特性与机制[J].离子交换与吸附,2018,34(1):49-62.