摘要
利用生物质碱热处理(ATT)技术制氢可同步副产多孔生物炭,将该类生物炭应用于染料废水治理,有望提升生物质资源的综合利用效率。采用ATT技术一步制备高比表面积多孔生物炭,考察了制备温度对其理化性质的影响,并评估了其对阳离子染料亚甲基蓝(MB)的吸附性能。结果表明,700℃为生物炭的最佳制备温度,该温度下制备的生物炭具备发达的孔隙结构(0.82 cm^(3)/g)、丰富的C=C基团和C=O基团以及高达1757.9 m^(2)/g的比表面积,为MB吸附提供了充足的扩散通道和结合位点。700℃下制备的生物炭在投加量0.4 g/L、吸附时间6 min和吸附温度25℃条件下,对200 mg/L MB溶液的吸附量和去除率分别达到488.13 mg/g和97.63%。该吸附过程主要表现为单层吸附,同时兼具物理吸附与化学吸附特征。
Hydrogen production via alkaline thermal treatment(ATT)of biomass can simultaneously produce porous biochar as a byproduct.Applying such biochar to dye wastewater treatment offers promising potential to improve the comprehensive utilization efficiency of biomass resources.High-surface-area porous biochar was synthesized through a one-step ATT process,and the effect of preparation temperature on its physicochemical properties was investigated.The adsorption performance of the resulting biochar toward the cationic dye methylene blue(MB)was also evaluated.The results indicate that 700℃is the optimal preparation temperature.At this temperature,the biochar exhibits a well-developed porous structure(0.82 cm^(3)/g),abundant C=C and C=O functional groups and a large specific surface area of 1757.9 m^(2)/g,providing sufficient diffusion channels and binding sites for MB adsorption.Under conditions of dosage of 0.4 g/L,adsorption time of 6 min and temperature of 25℃,the biochar prepared at 700℃achieve an adsorption capacity of 488.13 mg/g and a removal efficiency of 97.63%for 200 mg/L MB solution.The adsorption process is dominated by monolayer adsorption and involved both physical and chemical interactions.
作者
刘晓婷
鲁厚芳
吴可荆
LIU Xiaoting;LU Houfang;WU Kejing(School of Chemical Engineering,Sichuan University,Chengdu 610065,Sichuan,China;Tianfu Yongxing Laboratory,Chengdu 610213,Sichuan,China;Institute of New Energy and Low Carbon Technologies,Sichuan University,Chengdu 610207,Sichuan,China)
出处
《低碳化学与化工》
北大核心
2025年第8期160-168,178,共10页
Low-Carbon Chemistry and Chemical Engineering
基金
中央引导地方发展科技项目(2024ZYD0150)。
关键词
多孔生物炭
一步碱热处理
孔隙结构
亚甲基蓝吸附
吸附动力学
porous biochar
one-step alkaline thermal treatment
pore structure
methylene blue adsorption
adsorption kinetics
作者简介
第一作者:刘晓婷(2000-),硕士研究生,研究方向为生物质开发利用,E-mail:19983458711@163.com。;通信作者:吴可荆(1989-),博士,副研究员,研究方向为生物质化学品和能源技术开发,E-mail:wukj@scu.edu.cn。
