Adsorption Performance of Methylene Blue in Water by Activated Carbon from Olive Pomace
Olive pomace activated carbon(OP-AC)from olive pomace(OP)was prepared by high temperature calcination in a resistance furnace at 550℃with KOH as activator,and its adsorption performance for methylene blue(MB)in water was investigated.The optimum parameters of OP-AC preparation were the ratio of 20%KOH to OP charcoal powder(impregnation ratio)was2.5∶1(mL∶g),impregnation time of 4 h and activation time of 20 min.Under these conditions,when the dosage of OP-AC was 0.6 g,the pH value of water was 13,the shaking time was 15 min,and the MB initial mass concentration was 10 mg/L,the removal rate of MB could reach 99.3%.The OP-AC was characterized by scanning electron microscope(SEM),Fourier transform infrared(FT-IR)and pore size analyzer.The analysis showed that there were multiple oxygen-containing functional groups on the surface of the sample.The specific surface area of OP-AC was 278.832 m2/g,the average pore size was 1.889 nm,the total pore volume was0.131 cm3/g,and the proportion of micropores was 79.42%.There were many functional groups on the surface of OP-AC samples.The kinetic analysis showed that the adsorption of MB in water by OP-AC was consistent with the quasi second-order kinetic model(R2>0.99),and the adsorption isotherm was better fitted by Langmuir model(R2>0.93).After 3 cycles of use,the removal rate of MB by OP-AC was still as high as 83.1%.After 6 cycles,the removal rate was still 68.6%.
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