Study On The Characters Of Adsorption And Resolution Of The Activated Carbon Under Microwave Radiation

Activated carbon has large specific surface area and pore structure,so it can adsorb the azo dyes effectively. Microwave not only can regenerate the activated carbon,but also has catalytic oxidation effection to the degradation of pollutants. In this paper,the characteristics of the absorbtion of activated carbon and regeneration of activated carbon with the microwave have been researched.Methyl orange(MO) has been selected as a simulate wastewater.The influence factors of the adsorption and regeneration processes have been investigated,including the quality of activated carbon, adsorption time, pH value,renewable power, microwave irradiation time and the regenerative atmosphere.Analyze the pore structure of The original carbon and regenerated carbon.Research the degradation of methyl orange and the existence of secondary contamination. The results showed that:(l)Under the optimal conditions applied of 10 mg/L MO solution,20 g/mL activated carbon dose,45 min,the effective adsorption was obtained. The pH had no significant influence of the adsorption effect.(2) The optimum conditions for microwave regeneration of cost activated carbon were microwave power 700 W and microwave irradiation time of 60 s.O2 and N2 led to almost no effect. The adsorption capacity of GAC for MO removal did some decrease after the 10 cycles of adsorption/regeneration. The porous structure of activated carbon after regeneration had been destroyed.Most of the pore sizes after regeneration were macropores.It was not conducive to the adsorption of activated carbon.(3) Analysis the degradation steam using the UV-visible spectrophotometer and liquid chromatography during the microwave regeneration process. It found that the azo and the benzene ring structure of the original methyl orange was destroyed. The degradation products contained a certain amount of nitric acid ions. It could confirm that microwave could regenerate the activated carbon and decomposed the MO to avoid secondary pollution effectively.(4)The flow activated carbon adsorption process had better practical effect than the mixing process.Using the activated carbon of 0.1 g/mL to adsorpt for 10 hours could achieve better adsorption effect. After five times absorbtion/regeneration recycles, the removal rate of MO was still higher than 50%.In this study, methyl orange had been adsorpted using of activated carbon to achieve the enrichment effect firstly.Then regenerated the activated carbon containing methyl orange with the microwave concentratedly. These could save energy.The microwave regeneration could effectively degrade contaminants,and avoid secondary pollution. It provides a certain reference value for industrial applications.