Activated Carbon Prepared with Olive Pomace and Used for Degradation of Printing and Dyeing Wastewater
Olive pomace(OP),a kind of solid waste,is generated in a large amount from olive-oil production industry,which can be used as the precursor of regeneration to produce a sort of cost-effective and environment-friendly biological adsorbent(OP-AC)by means of treating OP with potassium hydroxide as an activator.In this experimental study,OP-AC prepared in the laboratory and characterized by FT-IR,SEM,XPS,BET and XRD was applied to removing methylene blue(MB)from aqueous solution(printing/dyeing wastewater),and the effect of solid/iquid ratio,activation time and activation temperature on the adsorption capacity and MB removal rate were investigated by a single factor and response surface method(Box-Behnken).Consequently,it was showed that OP-AC being prepared as the solid-liquid ratio was 4∶5.8,the activation time 21 min and the activation temperature 527 ℃,and under this condition,MB removal rate could be up to 92.6％in max-imum;and the characterization of OP-AC showed that the specific surface area of the prepared OP-AC was 278.832 4 m/g,the average pore size 3.418 0 nm,and the total pore volume 0.131 684 cm/g,with the proportion of micropores being 79.42％,and the surface of OP-AC was ample in functional groups:mainly oxygen-containing functional groups,including hydroxyl groups,carboxyl groups and carbonyl groups.In conclusion,the result of this experimental study suggested that OP-AC,the prepared adsorbent,possessed a developed pore structure with abundant adsorption sites on the surface,being an efficient,en-vironmentally friendly and cost/effective bio-material and could be used to remove MB from the wastewater.
activated carbonadsorbentresponse surfacecharacterizationprinting and dyeing wastewater
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