铊在钛铁磁吸附剂上的吸附性能及机理研究。
Study on adsorption properties and mechanism of thallium onto titanium‑iron magnetic adsorbent.
机构信息
Guangdong key laboratory of Environmental Pollution and Health, School of Environment, Jinan University, Guangzhou 511443, China.
Analysis and Test Center, Guangdong University of Technology, Guangzhou 511443, China.
出版信息
Sci Total Environ. 2019 Dec 1;694:133625. doi: 10.1016/j.scitotenv.2019.133625. Epub 2019 Jul 27.
Thallium (Tl) contamination caused by the industrial wastewater leakage has become a serious environmental problem due to thallium's high toxicity. In this study, a novel titanium‑iron magnetic nano-sized adsorbent was synthesized and applied for the effective removal of thallium(I). The physicochemical properties of the adsorbent were investigated by a series of techniques such as scanning electron microscope (SEM), X-ray powder diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). About 83% of equilibrium adsorption capacity could be accomplished within the initial 30 min. The adsorption of Tl(I) was found to be highly dependent on solution pH. The maximum adsorption capacity of Tl(I) was 111.3 mg/g at pH 7.0. The presence of such co-existing cations as Na, Mg, Ca and Cu could have a certain influence on the uptake of Tl(I). The adsorption mechanism was proposed as a surface complexation process of Tl(I) ions by binding to deprotonated sites of hydroxyl groups on the adsorbent surface. The prepared magnetic adsorbent would be suitable for effectively treating thallium-containing water due to its promising adsorption ability towards Tl(I) and ease in operation.
铊（Tl）污染是由工业废水泄漏引起的，由于铊的毒性很高，已成为一个严重的环境问题。在这项研究中，合成了一种新型的钛铁磁性纳米吸附剂，并将其应用于有效去除铊（I）。通过扫描电子显微镜（SEM）、X 射线粉末衍射（XRD）和 X 射线光电子能谱（XPS）等一系列技术对吸附剂的物理化学性质进行了研究。在最初的 30 分钟内，约有 83%的平衡吸附容量可以达到。研究发现，Tl（I）的吸附高度依赖于溶液 pH 值。在 pH 值为 7.0 时，Tl（I）的最大吸附容量为 111.3mg/g。共存的阳离子如 Na、Mg、Ca 和 Cu 的存在可能对 Tl（I）的摄取有一定的影响。吸附机理被提出为 Tl（I）离子通过与吸附剂表面上的羟基去质子化位点结合而发生表面络合过程。由于该磁性吸附剂对 Tl（I）具有良好的吸附能力，操作简便，因此适合用于有效处理含铊废水。
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