钽掺杂六方相氧化钨对Sr^(2+)的吸附:Zeta电位的测量及吸附机理的研究（英文）  

Removal of Sr^(2+)Ions by Ta-Doped Hexagonal WO_3: Zeta Potential Measurements and Adsorption Mechanism Determination

作　　者：蹇源[1,2] 牟婉君[2] 刘宁[1] 彭述明[1,2] 

机构地区：[1]四川大学原子核科学技术研究所,辐射物理及技术教育部重点实验室,成都610064 [2]中国工程物理研究院核物理与化学研究所,四川绵阳621900

出　　处：《物理化学学报》2016年第8期2052-2058,共7页Acta Physico-Chimica Sinica

基　　金：supported by the National Natural Science Foundation of China(21501159)~~

摘　　要：研究Ta掺杂六方相氧化钨(hex-WO_3)材料在吸附Sr^(^(2+))过程中其表面zeta电位的变化情况,并进一步探讨了吸附过程的热力学及吸附机理。结果表明:(1)在实验pH值范围内,Ta掺杂hex-WO_3悬浮液的zeta电位值随溶液中电解质的价态增大而增大;(2)且zeta电位随体系中离子强度的增加而增大;(3)Ta掺杂hexWO_3对Sr^(2+)的吸附容量随着温度降低而增大,随着离子强度的增加而减少;(4)吸附过程的吸附焓为-47 k J?mol^(-1),且Sr^(2+)离子与材料表面之间主要为化学相互作用;(5)Ta掺杂hex-WO_3对Sr^(2+)吸附过程主要为材料表面吸附及材料孔道内离子交换共同作用。The adsorption of Sr^2＋ ions onto Ta-doped hex-WO3 nanomaterials was studied by measuring the zeta potentials of the powder nanoparticies and by determining the adsorption isotherm and adsorption mechanism. Five important results were obtained： （1） the zeta potential values of the Ta-doped hex-WO3 suspensions in different electrolyte solutions, within the studied pH ranges, increased with an increase in electrolyte valence; and （2） the zeta potential of the Ta-doped hex-WO3 suspensions increased with an increase in ionic strength. （3） Sr^2＋ ion adsorption increased with a decrease in temperature and ionic strength. （4） The adsorption enthalpy was calculated as -47 kJ·mol^-1, and the interaction between the Ta-doped hex-WO3 surface and Sr^2＋ ions was concluded to be chemical in nature. （5） The adsorption of Sr^2＋ ions onto the Ta-doped hex-WO3 was attributed to surface chemical adsorption and ion exchange （in tunnels）.

关 键 词：TA hex-WO3 ZETA电位 Sr^2+ 吸附机理 

分 类 号：O647.3[理学—物理化学]