Study on adsorption of methyl orange in printing and dyeing wastewater by spent bleaching earth carbon
In this study,spent bleaching earth carbon(SBE@C)was prepared by anoxic high-temperature pyrolysis of spent bleaching earth(SBE),which is a by-product of oil refining industry.SBE@C could remove methyl orange from printing and dyeing wastewater.The results showed that the adsorption capacity of methyl orange on 1,2 and 3 g/L SBE@C were 12.53,7.14 and 5.12 mg/g at 180 min,respectively.The adsorption kinetics of methyl orange on SBE@C was more in accordance with pseudo-second order kinetic model,and the adsorption isotherm fitted the Freundlich model better.Furthermore,the adsorption performance of SBE@C for complex dyes(methyl orange-eosin Y-alizarin red)was also investigated.The effect of ionic strength and coexisting anions on the adsorption of SBE@C were studied.The results indicated that the inhibitory effect of coexisting Cl-on the adsorption of SBE@C increased with the increase of ionic strength.CO2-3,Cl-,PO3-4 and SO2-4 all showed inhibitory effect on the adsorption of SBE@C.
Spent bleaching earth carbonprinting and dyeing wastewateradsorptionmethyl orange
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