Low Temperature One-Pot Hydrothermal Carbonization of Corn Straw into Hydrochar for Adsorbing Cadmium (II) in Wastewater

Heng Li, Yan Shi, Li Bai, Mingshu Chi, Xiuling Xu and Yue Liu
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Heng Li: School of Municipal and Environmental Engineering, Jilin Jianzhu University, Changchun 130118, China
Yan Shi: School of Municipal and Environmental Engineering, Jilin Jianzhu University, Changchun 130118, China
Li Bai: Key Laboratory of Songliao Aquatic Environment Ministry of Education, Jilin Jianzhu University, Changchun 130118, China
Mingshu Chi: School of Municipal and Environmental Engineering, Jilin Jianzhu University, Changchun 130118, China
Xiuling Xu: Library of Jilin Jianzhu University, Changchun 130118, China
Yue Liu: School of Municipal and Environmental Engineering, Jilin Jianzhu University, Changchun 130118, China

Energies, 2021, vol. 14, issue 24, 1-15

Abstract: Corn straw, a typical agricultural waste, was directly converted into hydrochar with a yield of 77.56% by hydrothermal carbonization at 140–230 °C for 2 h with a solid–liquid ratio of 1:20. The morphology and surface properties were characterized by elemental analysis, specific surface area and pore size analysis and Fourier transform infrared spectroscopy. The results showed that with the increase of hydrothermal reaction temperature, some physical and chemical properties such as the increase of hydrocarbon content, crystallinity, and specific surface area of hydrochar changed significantly. A series of chemical reactions such as dehydration, decarboxylation, and aromatization occurred in the hydrothermal carbonization process so that the prepared hydrochar had rich oxygen-containing functional groups (-HO, C-O-C, C=O) and unique porous structure made the hydrochar prepared at 170 °C had the best removal effect on Cd 2+ in solution (5.84 mg/g). These specific conditions could remove Cd 2+ and greatly improve the adsorption performance. The pseudo-second-order kinetic model and Freundlich isotherm model could better describe the adsorption behavior of Cd 2+ . Therefore, corn straw hydrochar as a potential adsorbent for removing Cd 2+ from water.

Keywords: corn straw; hydrothermal carbonization; adsorption; Cd 2+ (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: Add references at CitEc
Citations: View citations in EconPapers (2)

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