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Investigation of a Carbon-Based Sorbent Prepared from FeSO4-Flocculated Sludge for Elemental Mercury Removal from Syngas

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Abstract

A novel carbon-based sorbent was prepared from FeSO4-flocculated sludge by one-step pyrolysis. The characterization results indicated that multiple Fe2O3 and sulfur species (S22− and polysulfide) existed over this sludge-derived sorbent. Its performance on Hg0 removal from syngas was evaluated. The sorbent from the sludge pyrolyzed at 710 ℃ could achieve around 86 % Hg0 removal efficiency at 150 ℃ under simulated syngas (400 ppm H2S, 10 ppm HCl, 20 vol% H2, 30 vol% CO, 8 vol% H2O and N2). H2S and HCl exhibited a promoting effect on Hg0 removal, whereas CO, H2 and H2O inhibited Hg0 removal. The analysis of adsorption kinetics manifested that Hg0 adsorption over the sorbent was better described by pseudo-second-order kinetic model, implying that it was a chemisorption process. The Hg0 removal under N2 condition was due to the reaction between absorbed Hg0 and Fe3+–O or S22−/polysulfide over the sorbent surface. In the presence of H2S, multiple sulfur species was produced by the reaction of adsorbed H2S with Fe3+–O. The increased sulfur species (S22− and polysulfide) greatly promoted the formation of HgS. The sorbent has good prospect in engineering applications because of its good Hg0 removal performance, low cost and facile preparation process.

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Acknowledgements

This work was supported by the Natural Science Foundation of Hubei Province (2019CFB324) and the Fundamental Research Funds for the Central Universities, Zhongnan University of Economics and Law (2722020JCG065, 31512000061 and 31510000128).

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Authors and Affiliations

  1. Research Center for Environment and Health, School of Information and Safety Engineering, Zhongnan University of Economics and Law, Wuhan, 430073, Hubei, People’s Republic of China

    Jingdong Zhang, Yanxiao Cao, Honghu Li, Fei Li, Chaoyang Liu & Hongcheng Ruan

  2. School of Resource and Environmental Sciences, Wuhan University, Wuhan, 430079, Hubei, People’s Republic of China

    Yuchi Chen

  3. Changjiang Institute of Survey, Planning, Design and Research, Wuhan, 430014, Hubei, People’s Republic of China

    Hao Rong

  4. WISDRI City Environment Protection Engineering Co., LTD, Wuhan, 430200, Hubei, People’s Republic of China

    Yuan Wang

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  1. Yuchi Chen
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Chen, Y., Rong, H., Zhang, J. et al. Investigation of a Carbon-Based Sorbent Prepared from FeSO4-Flocculated Sludge for Elemental Mercury Removal from Syngas. Waste Biomass Valor 13, 1323–1337 (2022). https://doi.org/10.1007/s12649-021-01583-y

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