Corncob-to-xylose residue (CCXR) derived porous biochar as an excellent adsorbent to remove organic dyes from wastewater |
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| Authors: | Yanling Yu Yuan Wan Hongru Shang Bin Wang Peng Zhang Yujie Feng |
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| Institution: | 1. MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, China, 150001;2. School of Chemistry and Chemical Engineering, Xiamen University, Xiamen, China, 361005;3. State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, China, 150090 |
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| Abstract: | Biochar was prepared from corncob-to-xylose residue (CCXR) by KOH activation and anaerobic pyrolysis method. The effect of activation temperature on the microstructure of the biochar was studied. Results showed that the biochar prepared at 850°C (850NBC) possessed high specific surface area and exhibited excellent adsorption property. The maximum adsorption capacity of 2249 mg g?1 was obtained when 850NBC was used for treating methylene blue (MB) solution. Adsorption isotherm fittings revealed that Langmuir and Freundlich models were applicable to 850NBC adsorption process, and the adsorption process was limited by adsorption site and the biochar surface functional groups. Furthermore, 850NBC showed good adsorption property when it was used to treat the other organic dyes of Congo red (751 mg g?1), Orange II (735 mg g?1), Indigo carmine (662 mg g?1) and Methyl Orange (465 mg g?1). Biochar 850NBC also possessed an acceptable recyclability which maintained 68.7% absorption capacity after 6 cycles when it was used to treat MB solution. These results proposed that 850NBC is expected to be a promising potential adsorbent for treating organic dyes waste water. |
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| Keywords: | adsorption biochar corncob-to-xylose residues dyes waste water |
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