Study on Competitive Adsorption of Multiple Dyes in the Process of Removing Printing and Dyeing Wastewater by Spent Bleaching Earth Carbon
Spent bleaching earth(SBE)is a solid waste produced in the process of oil refining.The improper disposal of SBE would cause environmental pollution and waste of resources.Considering the resource utilization of SBE,SBE was anoxically calcined to prepare spent bleaching earth carbon(SBE@C)adsorbent at high temperature,and the study of competitive adsorption of multiple dyes by SBE@C was performed.The effect of different pyrolysis temperatures on the adsorption of three dyes(i.e.,methyl orange,eosin Y,alizarin red)by SBE@C in printing and dyeing wastewater was studied.SEM,EDAX,BET,XRD,FTIR and XPS characterization analysis of the materials before and after pyrolysis were carried out.The results showed that the high temperature pyrolysis carbonized the residual oil on the surface of SBE,which increased the specific surface area and pore volume,thereby increasing the adsorption capacity.When the pyrolysis temperature was 800℃,SBE@C had the best adsorption performance for dyes.Multiple competitive adsorption experiment showed that there was a certain degree of competitive adsorption among the three dyes.Also,the multiple competitive adsorption process was determined by chemisorption,and fitted well with the intra-particle diffusion model.SBE@C was regenerated with NaOH solution,and SBE@C still had a great adsorption performance for the three dyes after four cycles.
spent bleaching earth carbonmulticomponent competitive adsorptionremoval performancemethyl orangeeosin Yalizarin red
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