| 钽掺杂六方相氧化钨对Sr2+的吸附:Zeta电位的测量及吸附机理的研究 |
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| 引用本文： | 蹇源,牟婉君,刘宁,彭述明.钽掺杂六方相氧化钨对Sr2+的吸附:Zeta电位的测量及吸附机理的研究[J].物理化学学报,2016,32(8):2052-2058. |
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| 作者姓名： | 蹇源 牟婉君 刘宁 彭述明 |
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| 作者单位： | 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6100642 中国工程物理研究院核物理与化学研究所,四川绵阳621900 |
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| 基金项目： | The project was supported by the National Natural Science Foundation of China(21501159) |
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| 摘 要： | 研究Ta掺杂六方相氧化钨(hex-WO3)材料在吸附Sr2+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-WO3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hex-WO3对Sr2+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 kJ·mol-1，且Sr2+离子与材料表面之间主要为化学相互作用；(5) Ta掺杂hex-WO3对Sr2+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。
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| 关 键 词： | Ta hex-WO3 Zeta电位 Sr2+ 吸附机理 |
| 收稿时间： | 2016-02-29 |
Removal of Sr2+ Ions by Ta-Doped Hexagonal WO3: Zeta Potential Measurements and Adsorption Mechanism Determination |
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| Yuan JIAN,Wan-Jun MU,Ning LIU,Shu-Ming PENG.Removal of Sr2+ Ions by Ta-Doped Hexagonal WO3: Zeta Potential Measurements and Adsorption Mechanism Determination[J].Acta Physico-Chimica Sinica,2016,32(8):2052-2058. |
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| Authors: | Yuan JIAN Wan-Jun MU Ning LIU Shu-Ming PENG |
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| Institution: | 1. Key Laboratory of Radiation Physics and Technology, Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, P. R. China;2. Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, Sichuan Province, P. R. China |
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| Abstract: | The adsorption of Sr2+ ions onto Ta-doped hex-WO3 nanomaterials was studied by measuring the zeta potentials of the powder nanoparticles 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) Sr2+ 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 Sr2+ ions was concluded to be chemical in nature. (5) The adsorption of Sr2+ ions onto the Ta-doped hex-WO3 was attributed to surface chemical adsorption and ion exchange (in tunnels). |
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| Keywords: | Ta hex-WO3 Zeta potential Sr2+ Adsorption mechanism |
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