Abstract：In order to effectively treat dyeing wastewater and develop an economic and efficient adsorbent, the biochar derived from spent auricularia auricula substrate (AGBC) was prepared by oxygen limited pyrolysis method at 350℃, 550℃ and 750℃ to treat colored wastewater containing malachite green (MG) and safranine T (ST) in this study. The effects of initial pH, adsorption time and initial concentration on the adsorption of MG and ST by AGBC were investigated, and the adsorption kinetics and isothermal adsorption characteristics were discussed. FTIR, XRD and SEM and other techniques were used to characterize the biochar derived from spent auricularia auricula substrate before and after adsorption, and the adsorption mechanism was explored. The results showed that with the increase of pyrolysis temperature, the number of oxygen functional groups on the adsorbent surface decreased, while the specific surface area and aromatization degree increased gradually. The equilibrium adsorption capacity of MG increased with the increase of pH value, while the equilibrium adsorption amount of ST showed the opposite trend. The adsorption of MG and ST on AGBC reached equilibrium at 8h and 4h, respectively. The adsorption process of MG on AGBC followed the pseudo first order kinetics model and the Freundlich model, which indicated that it is mainly physical adsorption. The adsorption process of ST conformed to the pseudo second order kinetics model and the Freundlich model, which indicated that the adsorption process is mainly chemical adsorption. Compared with AG350and AG550, AG750had higher adsorption capacity for MG and ST, and the maximum adsorption capacity of AG750 on MG and ST were 10249.79mg/g and 3353.49mg/g, respectively, which were fitted by Langmuir model. The adsorption mechanism showed that the adsorption of MG on AGBC is mainly electrostatic attraction and π-π stacking interaction, while ST is mainly hydrogen bonding, π-π stacking interaction and electrostatic attraction. This showed that AGBC has excellent adsorption potential for cationic dyes, therefore it can be an economical and efficient adsorption material.
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SU Long, ZHANG Hai-bo, CHENG Hong-yan, ZHANG Guo-sheng, LUO Yuan, HE Xiao-fang, REN Yuan-sen, YAN Shuang-dui. Study on adsorption properties of biochar derived from spent Auricularia auricula substrate for cationic dyes.. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(2): 693-703.
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