Microwave Preparation Of Modified Activated Carbons For Organic Pollutant Degradation In Aqueous Solution

Phenolic compound are the most of the hazardous compound found in the waste water. Even at low concentration, these compounds are very toxic and can seriously affect our environment. Waste Water containing this type of hazardous compound need to be treated before realized into the environment. One of the most used methodologies to treat this waste water is to absorb the organic pollutant using materials like activated carbons.In this work we focused our research on the modifications of the activated carbons properties. The modification was essentially focused by impregnating metal on the activated carbons pores. Then the modified activated carbons were prepared by microwave heating under nitrogen atmosphere. The as prepared modified Activated carbon (GAC/Ni, GAC/Cu, GAC/MW) were used to adsorb phenol in aqueous solution. After saturation, microwave heating was used as the regeneration method. The prepared modified activated carbons catalytic activity was also investigated for phenol and Methyl Orange (MO) degradation in aqueous solution.A comparative study on the as prepared modified activated carbons adsorption has been investigated. The adsorption capacity of the activated carbon treated by microwave heating has considerably increased. The activated carbon impregnated with nickel showed higher adsorption capacity comparatively to the activated carbon impregnated with cooper.Optimization of the adsorption condition of phenol by the activated carbons has been investigated for the different types of activated carbons. The results showed that under optimal conditions, the adsorption of phenol reached95%.The effect of temperature and pH of the aqueous solution was investigated. The results showed temperature and pH change has no effect on phenol adsorption.The modified activated carbons (MW/GAC, GAC/Ni and GAC/Cu) adsorptive capacity was higher than the untreated activated carbon (GAC) used as received. The adsorption capacity of activated carbon loaded with ion Ni2+is higher than the activated carbon loaded with Cu2+. The untreated activated carbon has the lowest adsorption capacity. The regeneration efficiency of the activated carbon loaded with Ni2+is higher than the activated carbon loaded with Cu2+. Activated carbon loaded with Ni2+can absorb more microwave energy than the one loaded with Cu2+During the regeneration process, the activated carbons temperature was measured. The temperature of the modified activated carbons decreases when the activated carbons are regenerated several times. The temperature of GAC/Cu decrease considerably when compared to the activated carbon loaded with nickel (GAC/Ni).The GAC/Ni temperature was higher than GAC/Cu, GAC/MW and GAC.A study on the activated carbons regeneration mechanism process was investigated. It has been proved that during microwave regeneration, phenol was simply desorbed from activated carbons. Identical results were found with both activated carbons impregnated with ions Ni2+and Cu2+.Impregnation of metal into activated carbon have no effect on the activated carbon regeneration mechanism.The quantity of metal impregnated into activated carbon influences considerably the activated carbons regeneration efficiency. The result shows that the regeneration efficiency of the activated carbon impregnated with high Ni2+quantity is considerably low.The as prepared activated carbons were used also as catalyst for phenol degradation of phenol and methyl orange in aqueous solution under microwave irradiation. It’s known that impregnating metal on activated carbon pores improves the activated carbons catalytic activity.The results showed that the as prepared activated carbons have can not degradation phenol in aqueous solution. The results showed the activated carbon impregnated with Ni2+degrades methyl orange in aqueous solution. In presence of gas bubbling the degradation of the methyl orange increases considerably. But when experience were conducted without gas bubbling, the degradation of methyl orange (MO) in aqueous solution was very low。...