物理化学学报 >> 2016, Vol. 32 >> Issue (8): 2052-2058.doi: 10.3866/PKU.WHXB201604213

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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

蹇源1,2,*(),牟婉君2,刘宁1,彭述明1,2,*()   

  1. 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
  • 收稿日期:2016-02-29 发布日期:2016-07-29
  • 通讯作者: 蹇源,彭述明 E-mail:inpc207@163.com;pengsm01@163.com
  • 基金资助:
    国家自然科学基金(21501159)

Removal of Sr2+ Ions by Ta-Doped Hexagonal WO3: Zeta Potential Measurements and Adsorption Mechanism Determination

Yuan JIAN1,2,*(),Wan-Jun MU2,Ning LIU1,Shu-Ming PENG1,2,*()   

  1. 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
  • Received:2016-02-29 Published:2016-07-29
  • Contact: Yuan JIAN,Shu-Ming PENG E-mail:inpc207@163.com;pengsm01@163.com
  • Supported by:
    The project was supported by the National Natural Science Foundation of China(21501159)

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。

关键词: Ta, hex-WO3, Zeta电位, Sr2+, 吸附机理

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).

Key words: Ta, hex-WO3, Zeta potential, Sr2+, Adsorption mechanism

MSC2000: 

  • O647