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

Abstract

摘要：研究 Ta 掺杂六方相氧化钨(hex-WO3)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-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 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 kJ• 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-WO3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。 关键词：Ta；hex-WO3；Zeta 电位；Sr 2+ ；吸附机理 中图分类号：O647

Efficient Capture of Radioactive Strontium from Water Using Magnetic WO3 Assembled on Grapheme Oxide Nanocomposite

“…Moreover, h‐WO 3 possesses many advantages such as uniform size and shape, resistance to acid, thermal stability and low cytotoxicity . Our previous studies have already demonstrated that h‐WO 3 nanomaterials with irreversible absorption properties and selective adsorption behavior can be regarded as one of the most efficient and promising absorbents for removing radioactive ions from contaminated water . However, h‐WO 3 prepared by a hydrothermal method is usually in the form of a very fine powder, and it is easily aggregated during adsorption process, which influences the final adsorption capacity.…”