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Outstanding Resistance of H2S-Modified Cu/TiO2 to SO2 for Capturing Gaseous Hg0 from Nonferrous Metal Smelting Flue Gas: Performance and Reaction Mechanism
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2018-08-21 , DOI: 10.1021/acs.est.8b03484
Lingnan Kong 1, 2 , Sijie Zou 2 , Jian Mei 1 , Yang Geng 2 , Hui Zhao 1 , Shijian Yang 1
Affiliation  

The utilization of H2SO4, produced using SO2 from nonferrous metal smelting flue gas as a source of S, is extremely restricted due to Hg contamination; therefore, there is great demand to remove Hg0 from smelting flue gas. Although the ability of Cu/TiO2 to capture Hg0 is excellent, its resistance to H2O and SO2 is very poor. In this study, Cu/TiO2 was treated with H2S to improve its resistance to H2O and SO2 for capturing Hg0. The chemical adsorption of Hg0 on Cu/TiO2 was primarily through the HgO route, which was almost suppressed by H2O and SO2 due to the transformation of CuO into CuSO4. Besides the HgO route, the HgS route also contributed to the chemical adsorption of Hg0 on modified Cu/TiO2. As the CuS on modified Cu/TiO2 was inert to H2O and SO2, the chemical adsorption of Hg0 on modified Cu/TiO2 through the HgS route was barely inhibited. Meanwhile, the HgS route was predominant in the chemical adsorption of Hg0 on modified Cu/TiO2. Therefore, modified Cu/TiO2 exhibited an excellent resistance to H2O and SO2, and its Hg0 capture capacity from simulated flue gas was up to 12.7 mg g–1 at 100 °C.

中文翻译:

H 2 S改性的Cu / TiO 2对SO 2捕获有色金属冶炼烟气中气态Hg 0的优异阻力:性能和反应机理

由于汞的污染,使用有色金属冶炼烟气中的SO 2产生的H 2 SO 4的利用受到了极大的限制。因此,从冶炼烟气中去除Hg 0的需求很大。尽管Cu / TiO 2捕获Hg 0的能力非常出色,但其对H 2 O和SO 2的抵抗力却很差。在这项研究中,用H 2 S处理Cu / TiO 2以提高其对H 2 O和SO 2的抵抗力,以捕获Hg 0。Hg 0在Cu / TiO上的化学吸附2主要是通过HgO途径,由于CuO转化为CuSO 4,几乎被H 2 O和SO 2抑制。除了HgO途径外,HgS途径还有助于Hg 0在改性Cu / TiO 2上的化学吸附。由于改性Cu / TiO 2上的CuS对H 2 O和SO 2呈惰性,因此几乎不抑制Hg 0通过HgS途径在改性Cu / TiO 2上的化学吸附。同时,HgS途径主要是Hg 0在改性Cu / TiO 2上的化学吸附。因此,改性Cu / TiO2表现出至H优良的耐2 O和SO 2,和其汞0从模拟烟道气捕获能力达12.7毫克克-1在100℃下。
更新日期:2018-08-22
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