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铊（I）在金红石型纳米二氧化钛上的吸附及其环境意义

Adsorption of thallium(I) on rutile nano-titanium dioxide and environmental implications.

作者信息

Zhang Weilong, Wu Yang, Wang Jin, Liu Juan, Lu Haifeng, Zhai Shuijing, Zhong Qiaohui, Liu Siyu, Zhong Wanying, Huang Chunling, Yu Xiaoxiang, Zhang Wenhui, Chen Yongheng

机构信息

Innovation Center and Key Laboratory of Water Quality and Conservation in the Pearl River Delta, Ministry of Education, School of Environmental Science and Engineering, Guangzhou University, Guangzhou, China.

Wuhan Digital Engineering Institute, Wuhan, China.

出版信息

PeerJ. 2019 May 16;7:e6820. doi: 10.7717/peerj.6820. eCollection 2019.

DOI:10.7717/peerj.6820
PMID:31143532
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6526007/
Abstract

Rutile nano-titanium dioxide (RNTD) characterized by loose particles with diameter in 20-50 nm has a very large surface area for adsorption of Tl, a typical trace metal that has severe toxicity. The increasing application of RNTD and widespread discharge of Tl-bearing effluents from various industrial activities would increase the risk of their co-exposure in aquatic environments. The adsorption behavior of Tl(I) (a prevalent form of Tl in nature) on RNTD was studied as a function of solution pH, temperature, and ion strength. Adsorption isotherms, kinetics, and thermodynamics for Tl(I) were also investigated. The adsorption of Tl(I) on RNTD started at very low pH values and increased abruptly, then maintained at high level with increasing pH >9. Uptake of Tl(I) was very fast on RNTD in the first 15 min then slowed down. The adsorption of Tl(I) on RNTD was an exothermic process; and the adsorption isotherm of Tl(I) followed the Langmuir model, with the maximum adsorption amount of 51.2 mg/g at room temperature. The kinetics of Tl adsorption can be described by a pseudo-second-order equation. FT-IR spectroscopy revealed that -OH and -TiOO-H play an important role in the adsorption. All these results indicate that RNTD has a fast adsorption rate and excellent adsorption amount for Tl(I), which can thus alter the transport, bioavailability and fate of Tl(I) in aqueous environment.

摘要

金红石型纳米二氧化钛（RNTD）的颗粒疏松，直径在20 - 50纳米之间，具有非常大的表面积，可用于吸附铊（Tl），铊是一种具有剧毒的典型痕量金属。随着RNTD应用的增加以及各种工业活动中含铊废水的广泛排放，会增加它们在水生环境中共存的风险。研究了Tl(I)（自然界中铊的一种常见形态）在RNTD上的吸附行为与溶液pH值、温度和离子强度的关系。还研究了Tl(I)的吸附等温线、动力学和热力学。Tl(I)在RNTD上的吸附在非常低的pH值时开始，然后急剧增加，在pH >9时随着pH值的增加保持在高水平。在最初的15分钟内，RNTD对Tl(I)的吸附非常快，然后减慢。Tl(I)在RNTD上的吸附是一个放热过程；Tl(I)的吸附等温线符合Langmuir模型，在室温下最大吸附量为51.2 mg/g。Tl吸附的动力学可以用准二级方程来描述。傅里叶变换红外光谱表明，-OH和-TiOO-H在吸附过程中起重要作用。所有这些结果表明，RNTD对Tl(I)具有快速的吸附速率和优异的吸附量，从而可以改变Tl(I)在水环境中的迁移、生物有效性和归宿。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9210/6526007/b54e325b51ec/peerj-07-6820-g009.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9210/6526007/ca637e49ab93/peerj-07-6820-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9210/6526007/0e7c352d773d/peerj-07-6820-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9210/6526007/b54e325b51ec/peerj-07-6820-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9210/6526007/14a9edfac630/peerj-07-6820-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9210/6526007/896abe08516f/peerj-07-6820-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9210/6526007/ff9ac2261286/peerj-07-6820-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9210/6526007/46eb4b864832/peerj-07-6820-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9210/6526007/2c01ac05f388/peerj-07-6820-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9210/6526007/e18580022026/peerj-07-6820-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9210/6526007/ca637e49ab93/peerj-07-6820-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9210/6526007/0e7c352d773d/peerj-07-6820-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9210/6526007/b54e325b51ec/peerj-07-6820-g009.jpg

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