In Situ Emergency Disposal of Liquid Mercury Leakage by Fe-Containing Sphalerite: Performance and Reaction Mechanism

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• 作者：Yong Liao ; Yulin Xia ; Sijie Zou ; Peng Liu ; Xiaoliang Liang ; Shijian Yang
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2017
• 出版时间：January 11, 2017
• 年：2017
• 卷：56
• 期：1
• 页码：153-160
• 全文大小：481K
• ISSN：1520-5045

文摘

The indoor concentration of mercury is often higher than the reference concentration due to the historic accidents with mercury-containing devices. Therefore, there is a great demand to develop a treatment for the accidental breakage of the devices containing liquid mercury. In this work, Fe-containing sphalerite was developed as a cost-effective sorbent for the in situ emergency disposal of liquid mercury leakage. Fe-containing sphalerite showed an excellent performance for elemental mercury capture at room temperature, with the capacity of much greater than 8.65 mg g^–1 and the reaction rate of 4.82 μg g^–1 min^–1. The formed Hg species on Fe-containing sphalerite was HgS, so it was thermally stable at room temperature, poor leachable and low toxicity to microorganism. The chemical adsorption of elemental mercury on Fe-containing sphalerite mainly followed the Mars–Maessen mechanism and approximately followed a pseudo-zero-order kinetic reaction. The reaction rate of elemental mercury with Fe-containing sphalerite mainly depended on the concentration of Hg⁰ physically adsorbed on the surface. The physical adsorption of Hg⁰ on sphalerite was remarkably promoted after the incorporation of Fe, which may be mainly related to the presence of cation vacancies on Fe-containing sphalerite.