Removal of thallium(I) from aqueous solutions using titanate nanomaterials: The performance and the influence of morphology
Removal of thallium(I) from aqueous solutions using titanate nanomaterials: The performance and the influence of morphology
复制标题
使用钛酸盐纳米材料去除水溶液中的铊(I)：性能和形貌的影响
DOI：
10.1016/j.scitotenv.2020.137090
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发表时间：
2020
影响因子：
9.8
通讯作者：
Xiao Tangfu
中科院分区：
文献类型：
--
作者：
Wang Nana;Su Zebin;Deng Nairui;Qiu Yuyin;Ma Liang;Wang Jianqiao;Chen Yuxiao;Hu Kaimei;Huang Chujie;Xiao Tangfu
铊(Tl)污染因其高毒性而引起了环境的关注，因此从环境中清除Tl具有重要意义。通过水热反应可以在不同条件下合成出不同形貌的钛酸盐纳米材料，但人们对其去除Tl(I)的认识有限。结果表明，在130℃下制备的纳米管呈纳米管状，反应时间越长，纳米管越完整，而在180℃下制备的纳米管呈纳米线状排列。纳米管和纳米线状纳米金属氧化物对Tl(I)具有较好的吸附能力，较宽的pH和温度范围，但吸附动力学不同。无机离子对Tl(I)的去除有一定的影响，重金属离子对Tl(I)去除的抑制作用大小顺序为：Pb(II)>Cu(II)>Cd(II)>Cd(II)>Zn(II)。线状TNM对Tl(I)去除的抗干扰性和选择性均高于管状TNM。管状和线状TNM对Tl(I)的高吸收是由静电吸引、与Na+/H+的离子交换、与层间-ONa官能团的络合和TNM表面的Ti-OH络合以及微沉淀驱动的，但它们的吸附构型不同。TNM具有较高的吸附容量和可再生性，在去除废水中的Tl(I)方面具有潜在的应用前景。研究表明，在不同条件下合成的Tm M对Tl(I)的吸附性能相似，制备的Tl(I)去除Tl(I)用Tm M对合成条件要求不高。
Thallium (Tl) pollution has attracted environmental attention due to its high toxicity, thus the cleanup of Tl from the environment is of significance. Titanate nanomaterials (TNMs) with different morphologies can be synthesized via a hydrothermal reaction under different conditions but the knowledge of the Tl(I) removal by them is limited. Our results indicated that TNM prepared at 130 °C exhibited a nanotubular appearance and a longer reaction time resulted in the formation of perfect nanotube, while that prepared at 180 °C exhibited a nanowire-like arrangement. The nanotubular and nanowire-like TNMs possessed approximately excellent Tl(I) adsorption capacities, wide pH, and temperature application ranges but different adsorption kinetics. Inorganic ions influenced the Tl(I) removal and the inhibiting effect of heavy metal ions followed the sequence Pb(II) > Cu(II) > Cd(II) > Zn(II). The anti-interference ability and selectivity of wire-like TNMs for Tl(I) removal were higher than those of tubular TNMs. High Tl(I) uptakes of tubular and wire-like TNMs were driven by the electrostatic attraction, ion exchange with Na+/H+, and complexation with –ONa functional groups in the interlayers and Ti–OH on the surfaces of TNMs as well as microprecipitation; while their adsorption configurations were different. TNMs are promising for potential applications in Tl(I) elimination from wastewater due to the high adsorption capacity and regenerability. This work indicates that TNMs synthesized under different conditions have the similar Tl(I) adsorption performances and the preparation of TNMs used for Tl(I) removal has an undemanding synthesis condition.