title: H2S-Modified Fe-Ti Spinel: A Recyclable Magnetic Sorbent for Recovering Gaseous Elemental Mercury from Flue Gas as a Co-Benefit of Wet Electrostatic Precipitators.
abstract: The nonrecyclability of the sorbents used to capture Hg0from flue gas causes a high operation cost and the potential risk of exposure to Hg. The installation of wet electrostatic precipitators (WESPs) in coal-fired plants makes possible the recovery of spent sorbents for recycling and the centralized control of Hg pollution. In this work, a H2S-modified Fe-Ti spinel was developed as a recyclable magnetic sorbent to recover Hg0from flue gas as a co-benefit of the WESP. Although the Fe-Ti spinel exhibited poor Hg0capture activity in the temperature range of flue gas downstream of flue gas desulfurization, the H2S-modified Fe-Ti spinel exhibited excellent Hg0capture performance with an average adsorption rate of 1.92 μg g-1min-1at 60 °C and a capacity of 0.69 mg g-1(5% of the breakthrough threshold) due to the presence of S22-on its surface. The five cycles of Hg0capture, Hg0recovery, and sorbent regeneration demonstrated that the ability of the modified Fe-Ti spinel to capture Hg0did not degrade remarkably. Meanwhile, the ultralow concentration of Hg0in flue gas was increased to a high concentration of Hg0, which facilitated the centralized control of Hg pollution.
authors.affiliation: Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology , Nanjing 210094, P. R. China.
authors.forename: Sijie
authors.initials: S
authors.lastname: Zou
authors.affiliation: Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology , Nanjing 210094, P. R. China.
authors.forename: Yong
authors.initials: Y
authors.lastname: Liao
authors.affiliation: Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology , Nanjing 210094, P. R. China.
authors.forename: Shangchao
authors.initials: S
authors.lastname: Xiong
authors.affiliation: Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology , Nanjing 210094, P. R. China.
authors.forename: Nan
authors.initials: N
authors.lastname: Huang
authors.affiliation: Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology , Nanjing 210094, P. R. China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Geng
authors.affiliation: Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology , Nanjing 210094, P. R. China.
authors.forename: Shijian
authors.identifier: 0000-0002-8275-5225
authors.initials: S
authors.lastname: Yang
mesh_terms: D000327:Adsorption; D003031:Coal; D005740:Gases; D008280:Magnetics; D008628:Mercury; D011210:Power Plants; D014025:Titanium
chemical_list: D003031:Coal; D005740:Gases; D014025:Titanium; D008628:Mercury