Abstract
The sludge-based activated carbons (SACs) were prepared by sewage sludge and corn straw and modified by ferric nitrate. The H2S removal performance and the desulfurization mechanism of the modified SAC were studied. Results showed that breakthrough sulfur capacity and saturation sulfur capacity of the SAC prepared by recommended modification were 27.209 mg/g and 48.098 mg/g, which were as 4.68 times and 7.02 times larger as those before modification, respectively. Additionally, results showed that the desulfurization products of unmodified SAC were mainly sulfur, while that of modified SAC were mainly sulfate. These results indicated that ferric nitrate modification changed the way of hydrogen sulfide removal by SAC: the desulfurization process of unmodified SAC can be expressed as S2− → S0 → S4+ → S6+, and the oxidative active component was dominated by O*, while that of modified SAC can be expressed as S2− → S0 → S6+, and the oxidative active components are both Fe3+ and O*.
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Funding
This work was supported by the Natural Science Research of Jiangsu Higher Education Institutions of China (No.19KJB610012, No.18KJB610006), the Introduction Talent Scientific Research Foundation Project of Nanjing Institute of Technology (No. YKJ201934), the Science and Technology Program of Guangzhou, China (No. 201803030038), and the National Key Research and Development Plan of China (No. 2019YFC0214302).
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FZ performed the whole experiment process of this study and was a major contributor in writing the manuscript. HHu provided understanding, proposal, and guiding direction for this study. JL analyzed and interpreted the patient data regarding the pore structure and pore size distribution. ML analyzed and interpreted the patient data regarding the N2 adsorption/desorption isotherms of different ACs. HHuang analyzed and interpreted the patient data regarding the TG-DTG curves of different SACs. KD analyzed and interpreted the patient data regarding the XPS curve of SACs. All authors read and approved the final manuscript.
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Zeng, F., Hu, H., Lu, J. et al. Performance and mechanism of hydrogen sulfide removal by sludge-based activated carbons prepared by recommended modification methods. Environ Sci Pollut Res 28, 31618–31629 (2021). https://doi.org/10.1007/s11356-021-12694-3
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DOI: https://doi.org/10.1007/s11356-021-12694-3