In this paper,microporous-rich biomass charcoal(referred to as FWB)was prepared using waste fir wood chips as the raw material,and 2,4-dichlorophenol(2,4-DCP)was used as the target pollutant.The effects of different adsorption conditions on the adsorption performance of 2,4-DCP by FWB were studied,and the kinetic models(quasi-primary kinetics,quasi-secondary kinetics and intraparticle diffusion models),isothermal adsorption models(Langmuir,Freundlich and Temkin models)and the adsorption thermodynamic model(Van't Hoff model)were used to fit the adsorption process and analyze its adsorption characteristics.The basic characteristics and adsorption mechanism of FWB were analyzed by SEM-EDS,BET,FTIR,XRD and XPS.The results showed that the adsorption process followed the quasi-secondary kinetic model and the Freundlich model,i.e.the adsorption of 2,4-DCP by FWB was based on the chemisorption of multilayers,with a maximum adsorption capacity of 138.05 mg/g.The adsorption process was a spontaneous heat absorption process.The biochar possesses a high specific surface area(326.770 m2/g),and an average pore size of 1.960.The total pore volume is 0.219 mL/g,and the micro-pore volume(0.178 mL/g)accounts for 81.279％of the total pore volume.
关键词
杉木屑/富微孔型生物炭/2,4-二氯苯酚/等温吸附/吸附动力学
Key words
fir wood chips/microporous-rich biochar/2,4-dichlorophenol/isothermal adsorption/adsorption kinetics
维普
万方数据