Promotional removal of gas-phase Hg0 over activated coke modified by CuCl2
| Autor: | Jie Zhang, Yaoyao Yi, Shanhong Li, Yindi Zhang, Lei Gao, Caiting Li, Xueyu Du, Zhenyu Li |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Chemistry
Health Toxicology and Mutagenesis Chemical oxygen demand Inorganic chemistry chemistry.chemical_element General Medicine Coke 010501 environmental sciences 01 natural sciences Pollution Mercury (element) Gas phase Adsorption X-ray photoelectron spectroscopy Catalytic oxidation Desorption Environmental Chemistry 0105 earth and related environmental sciences |
| Zdroj: | Environmental Science and Pollution Research. 27:17891-17909 |
| ISSN: | 1614-7499 0944-1344 |
| Popis: | Impregnating CuCl2 on AC (activated coke) support to synthesize xCuCl2/AC showed superior activity with higher 90% Hg0 removal efficiency at 80–140 °C, as well as a lower oxygen demand of 2% O2 for Hg0 removal. The acceleration on Hg0 removal was observed for NO and SO2. The BET, SEM, XRD, XPS, TPD, and FT-IR characterizations revealed that the larger surface area, sufficient active oxygen species and co-existence of Cu+ and Cu2+ may account for the efficient Hg0 removal. In addition, the low demand of gaseous O2 was contributed to higher content of active oxygen and formed active Cl. After adsorbing on Cu sites, Cl sites, and surface functional groups, the Hg0(ads) removal on xCuCl2/AC was proceeded through two ways. Part of Hg0(ads) was oxidized by active O and formed Hg0, and the other part of Hg0 combined with the active Cl, which was formed by the activation of lattice Cl with the aid of active O, and formed HgCl2. Besides, the Hg2+ detected in outlet gas through mercury speciation conversion and desorption peak of HgCl2 and Hg0 further proved it. As displayed in stability test and simulated industrial application test, CuCl2/AC has a promising industrial application prospect. |
| Databáze: | OpenAIRE |
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