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Removal of elemental mercury from flue gas using the magnetic attapulgite by Mn-Cu oxides modification

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Abstract

Mercury pollution has become one of the most concerned environmental issues in the world because of its high toxicity, non-degradability, and bioaccumulation. Attapulgite adsorbents modified by magnetic manganese-copper (MnxCuy-MATP) were fabricated by co-precipitation and ultrasonic impregnation method, aiming at removing Hg0 from coal-fired flue gas. BET, SEM, XRD, VSM, and XPS were used to systematically explore the physical and chemical properties of the adsorbents, the effects of manganese and copper additions, reaction temperature, and various components in the flue gas on the efficiency of Hg0 removal were investigated. Mn8Cu5-MATP exhibited the optimal properties, and excessive copper loadings led to the aggregation of the active components. The efficiency of mercury removal can be effectively improved by NO and HCl regardless of the absence and presence of O2, because the NO+, NO3, NO2, and Cl* produced during the reaction can promote the adsorption and oxidation of Hg0. SO2 and H2O inhibited the oxidation of Hg0 because of the competitive adsorption at the active sites, while a large amount of sulfite and sulfate were formed to block the pores. However, the introduction of copper caused the sample to obtain SO2 resistance, which resulted in a mercury removal efficiency of 84.3% even under 1500 ppm SO2. In addition, after 5 cycles of adsorption and regeneration, Mn8Cu5-MATP can still maintain excellent Hg0 removal ability. The fabricated adsorbent can save the actual production cost and effectively improve the mercury removal efficiency in sulfur-containing flue gas.

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Acknowledgements

The authors would like to thank for the support from the Test Center of Wuhan University.

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Authors and Affiliations

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

    Yifei Long, Zhong He, Xiaoyi Li, Yajie Yin, Yuan Wang, Honghu Li & Jiangjun Hu

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  1. Yifei Long
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  2. Zhong He
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  3. Xiaoyi Li
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  4. Yajie Yin
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  5. Yuan Wang
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  6. Honghu Li
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  7. Jiangjun Hu
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Contributions

All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by Yifei Long and Zhong He. The first draft of the manuscript was written by Yifei Long. Zhong He, Xiaoyi Li, Yajie Yin, Yuan Wang, Honghu Li, and Jiangjun Hu commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Jiangjun Hu.

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Long, Y., He, Z., Li, X. et al. Removal of elemental mercury from flue gas using the magnetic attapulgite by Mn-Cu oxides modification. Environ Sci Pollut Res 29, 14058–14069 (2022). https://doi.org/10.1007/s11356-021-16777-z

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