摘要
为将资源化生物质灰渣用于甲基橙(MO)废水的处理,在明确MO初始浓度、pH值、反应时间和温度影响的基础上,探讨MO去除的潜在机制和效果提升途径。结果表明,MO的去除随MO初始浓度的增加而增加,并在80 mg/L时趋于平衡。pH值为2时有利于吸附的进行,且MO去除在12 h内较为迅速,24 h后趋于平衡。Langmuir模型可较好地模拟生物质灰渣对MO的吸附过程,表明该吸附过程属于单分子层吸附,且对MO的理论最大吸附量为25.2 mg/g。此外,灰渣吸附MO能较好地被二级动力学拟合,说明化学吸附是MO去除的主控机制。FT-IR光谱进一步表明吸附机制主要由静电、表面络合物或沉淀等共同作用。此外,添加H_(2)O_(2)(最终质量浓度4%)可使MO的去除率提高67.2%,是提升灰渣对MO去除性能的有效途径。
To utilize the residual biomass ash from biomass power plant,the adsorption performance of biomass ash to methyl orange(MO)was investigated. Effects of MO initial concentration,pH,reaction time and temperature on the adsorption of MO by biomass ash were discussed. Meanwhile,the possible mechanisms of MO removal by biomass ash and potential improving path were attempted.Results showed that the MO adsorption capacity of biomass ash is increased with the initial concentration and equilibrated at 80 mg/L.The proper pH for adsorption was 2. The adsorption reaction was more rapid before 12 h,and tended to be equilibrium after 24 h.Langmuir model can well simulate the MO adsorption process by biomass ash,which indicated the adsorption process was attributed to monomolecular layer adsorption,and the maximum MO adsorption capacity was 25.2 mg/g. The kinetics of MO adsorption by biomass ash can be well fitted by the second order model,suggesting the MO removal was mainly controlled by chemical adsorption.Furthermore,FT-IR spectrometer implied that the mechanisms were mainly attributed to electrostatic adsorption,and the formation of surface complexes or precipitation. Besides,adding hydrogen peroxide(final concentration of 4%,w/w)can increase the MO removal by67.2%,which can be a possible path for improving MO removal using biomass ash.
作者
郭琬琳
刘章林
沈飞
Guo Wanlin;Liu Zhanglin;Shen Fei(College of Environment Sciences,Sichuan Agricultural University,Chengdu 611130,China;Institute of Ecological and Environmental Sciences,Sichuan Agricultural University t Chengdu 611130,China)
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2021年第1期379-384,共6页
Acta Energiae Solaris Sinica
基金
四川科技厅重点研发项目(2017SZ0028)
四川省国际合作项目(2017HH0047)。
关键词
生物质
灰渣处置
吸附
甲基橙
过氧化氢
biomass
ash handling
adsorption
methyl orange
hydrogen peroxide
