Enhanced adsorption of Ag+ on triethanolamine modified titanate nanotubes

Enhanced adsorption of Ag+ on triethanolamine modified titanate nanotubes
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三乙醇胺修饰钛酸盐纳米管增强银的吸附

DOI:
10.1016/j.colsurfa.2017.09.049
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发表时间:
2018-01
期刊:
Colloids and Surfaces A: Physicochemical and Engineering Aspects
影响因子:
--
通讯作者:
Zhou Yonghua
Zhou Yonghua
中科院分区:
其他
文献类型:
--
作者:
Wang Hui;Zheng Long;Liu Gonggang;Zhou Yonghua

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采用简单水热法和改性技术制备了三乙醇胺改性钛酸盐纳米管(teoa - tnt)新型高吸附量吸附剂。FT-IR、XPS、zeta电位和氮吸附-解吸结果表明,三乙醇胺(TEOA)通过静电相互作用和晶格掺杂成功修饰钛酸盐纳米管(TNTs)。与tnt相比,制备的teoa - tnt对Ag+的吸附能力显著增强。teoa - tnt对Ag+的吸附等温线符合Langmuir方程,25℃条件下teoa - tnt对Ag+的最大吸附量为396 mg/g。通过拟二级吸附动力学评价和金属银在TEOA-TNTs上的存在,证实了Ag+在TEOA-TNTs上的螯合还原机制。考虑到其相对简单的制备过程,teoa - tnt可以成为从水溶液中回收Ag+的有希望的候选者。
A novel high adsorption capacity adsorbent of triethanolamine modified titanate nanotubes (TEOA-TNTs) was prepared by simple hydrothermal process and modification technique. The FT-IR, XPS, Zeta-potential and nitrogen adsorption-desorption results showed that titanate nanotubes (TNTs) was successfully modified by triethanolamine (TEOA) via electrostatic interaction and laTEOA) via electrostatic interaction and lattice doping. The as-prepared TEOA-TNTs exhibited a significant enhancement on adsorption capacity towards Ag+compared with TNTs. The adsorption isotherm of Ag+on TEOA-TNTs fitted the Langmuir equation well and the maximum adsorption capacity of TEOA-TNTs for Ag+was estimated to be 396 mg/g at 25 °C. The chelation and reduction mechanism of Ag+on TEOA-TNTs was confirmed by the pseudo second-order adsorption kinetics assessments and the existence of metallic silver on TEOA-TNTs. Considering its relative simple preparation procedure, TEOA-TNTs can be a promising candidate for the recovery of Ag+from the aqueous solution.
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