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Development of low-concentration mercury adsorbents from biohydrogen-generation agricultural residues using sulfur impregnation |
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| Authors: | Hsi Hsing-Chengi Tsai Cheng-Yen Kuo Tien-Ho Chiang Cheng-Sheng |
| Institution: | a Institute of Environmental Engineering and Management, National Taipei University of Technology, No. 1, Sec. 3, Chung-Hsiao E. Rd., Taipei 106, Taiwan b Graduate Institute of Engineering Science and Technology, National Kaohsiung First University of Science and Technology, No. 2, Jhuoyue Rd., Nanzih, Kaohsiung 811, Taiwan c Department of Environmental, Safety and Health Engineering, Tungnan University, 152, Sec. 3, Peishen Rd., Shenkeng District, New Taipei City 222, Taiwan d Department of Safety, Health and Environmental Engineering, National Kaohsiung First University of Science and Technology, No. 2, Juoyue Rd., Nantsu, Kaohsiung 811, Taiwan |
| Abstract: | Mercury adsorbents were derived from waste biohydrogen-generation barley husk and rice husk via carbonization, steam activation, and sulfur impregnation at 300-650 °C. The samples derived from agricultural residues showed a greater Hg0 adsorption than that of a coal-based activated carbon, confirming the feasibility of resource recovery of these agricultural residuals for low-concentration gaseous Hg adsorption. Sulfur impregnation reduced both the surface area and pore volume of the samples, with lower temperature causing a greater decrease. Elevating the impregnation temperature increased the organic sulfur contents, suggesting that in addition to elemental sulfur, organic sulfur may also act as active sites to improve Hg0 adsorption. Oxygen and sulfur functional groups accompanying the microporous structures may account for the enhancing Hg0 adsorption of the raw and sulfur-treated samples, respectively. The pseudo-second-order model can best describe the chemisorption characteristics, implying that Hg0 adsorption on the samples was in a bimolecular reaction form. |
| Keywords: | Mercury Adsorption Surface modification Biotreated waste Activated carbon |
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