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| Characteristic and mechanism of methylene blue adsorption by biochar from the liquefaction of sewage sludge |
| PAN Zi-qian1, HUANG Hua-jun1, HE Xiao-wu1, XIAO Xiao-feng1, WANG Jia-xin1, LI Kai2, YANG Tang-yi3 |
1. Key Laboratory of Poyang Lake Basin Agricultural Resource and Ecology of Jiangxi Province, College of Land Resource and Environment, Jiangxi Agricultural University, Nanchang 330045, China;
2. Jinggangshan Environmental Monitoring Station, Jinggangshan 343600, China;
3. Jiangxi Environmental Protection Science Research Institute, Nanchang 330002, China |
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Abstract The purpose of this study was to investigate the adsorption potential/mechanism of biochar obtained from the liquefaction of sewage sludge in ethanol-water co-solvent, which could provide data support and theoretical reference for its application as adsorbent. Methylene blue wastewater was selected as the treatment object. The results showed that the adsorption capacity of biochar firstly increased with the increase of initial pH of MB solution. When the pH of MB solution was higher than 8, the alkaline fading of MB began to appear. The increase of adsorption temperature (30~60℃) had no obvious effects on the adsorption capacity of biochar. The adsorption capacity of biochar overall increased with the increase of adsorption time before 240min. When the adsorption time exceeded 240 min, the adsorption capacity tended to be stable. Too high or too low adsorbent dosage and initial MB concentration were both not beneficial for the adsorption process. Both of them had an optimal critical value of 6mg and 120mg/L, respectively. The adsorption process of MB by biochar matched perfectly with the pseudo-second-order model (R2=0.9994) and the Langmuir model (R2=0.9831), respectively. The adsorption process was spontaneous and endothermic, controlled by both physical and chemical adsorption. The specific adsorption mechanisms include ion exchange, functional group complexation, π-π adsorption, and so on.
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Received: 14 June 2019
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