Authors
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Xinyu Zhang
Jiangsu Co-Innovation Center for Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China; Hangzhou HUAWON New Material Technology Co., Ltd, Hangzhou 311305, China
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Chao Yang
Jiangsu Co-Innovation Center for Efficient Processing and Utilization of Forest Resources and International Innovation Center for Forest Chemicals and Materials, Nanjing Forestry University, Nanjing, 210037, China
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Tingwei Zhang
Jiangsu Co-Innovation Center for Efficient Processing and Utilization of Forest Resources and International Innovation Center for Forest Chemicals and Materials, Nanjing Forestry University, Nanjing, 210037, China
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Jiaqi Guo
Jiangsu Co-Innovation Center for Efficient Processing and Utilization of Forest Resources and International Innovation Center for Forest Chemicals and Materials, Nanjing Forestry University, Nanjing, 210037, China
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Yusheng Gan
Hangzhou HUAWON New Material Technology Co., Ltd, Hangzhou, 310000, China
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Haibiao Wu
Hangzhou HUAWON New Material Technology Co., Ltd, Hangzhou, 310000, China
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Mohammad Rizwan Khan
Department of Chemistry, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
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Huining Xiao
Department of Chemical Engineering, University of New Brunswick, Fredericton, NB, E3B 5A3, Canada
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Junlong Song
Jiangsu Co-Innovation Center for Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China
Keywords:
Self-nitrogen-doped biochar, Rhodamine B, Adsorption, Thermodynamics, Soybean cake
Abstract
Nitrogen-doped biochar performs much better in dye adsorption due to its rich functional groups. Soybean cake, a by-product of soybean oil production, comprises rich contents of cellulose, lignin, and protein. Therein, simple direct carbonization was utilized to prepare self-nitrogen-doped biochar (SCB). The results showed that the N content of SCB was 6.81 wt%, and its specific surface area was 18.8 m2/g. X-ray photoelectron spectroscopic results confirmed that the surface of SCB was rich in pyridine-N, pyrrole-N, graphite-N, and oxidized-N functional groups. The adsorption capacity of SCB for Rhodamine B was 17.2 mg/g, which is higher compared with other unactivated biochars. The results of thermodynamic parameters indicate that Rhodamine B adsorption on SCB is an endothermic, entropy-increasing, and spontaneous process.
