Experimental Research On Dielectric Barrier Discharge Modification And Regeneration Of Activated Carbon

Activated carbon adsorption is a common wastewater treatment method, it canremove organic contaminants from water in a simple, quick and practical way. Howto improve the adsorption capacity of the activated carbon has become a hot topic ofscholars at home and abroad. It not only can reduce the cost of wastewater treatment,but also can reduce the secondary contamination. Therefore, seeking an efficient andconvenient way to modify and regenerate activated carbon is crucial. Dielectricbarrier discharge technology is a new technology that can produce large amounts ofhigh-energy particles and UV. It has a considerable research prospects onmodification and regeneration of activated carbon and regeneration.This paper focus on the impact that different parameters causes on dielectricbarrier discharge modified activated carbon, Analyzing the change of modifiedactivated carbon in the physical and chemical properties by scanning electronmicroscopy, infrared spectroscopy and elemental analyzer and other instruments. Inaddition, using modified activated carbon static adsorption of aniline in water, thispaper investigated the factors of activated carbon dosage, initial pH, initialconcentration and temperature，analyzing the dynamic model. It is a proper way toregenerate saturated activated carbon through dielectric barrier discharge method.Finally, to get the degradation mechanism of aniline, the intermediate products in theprocess of treatment are analyzed by means of high efficiency liquid chromatographyand mass spectrography (LC-MS).The results and conclusions of research are as follows:(1) Dielectric barrier discharge plasma can effectively modify activated carbon.The modified activated carbon adsorption of aniline has increased by14.94%after20min with10kV discharge voltage,10mm electrode distance,10kHz powerfrequency,2.0g the quality of activated carbon.(2) Activated carbon pore volume and specific surface area will decrease and thesurface will etch after modification. Hydroxyl-OH and carbonyl C=O are changed.The acidic group and the oxygen element quality percentage will decrease, the number of basic group and the number of carbon element quality percentage willdecrease.(3) Adsorption of aniline with modified activated carbon can be better describedby Langmuir model, quasi-two kinetic models and particle diffusion model. Anilinemolecules π-π dispersion forces and hydrogen bonding enhancement may be causedby the improvement of the adsorption capacity.(4) Many high-energy active particles(O3,·O,·OH et al) generated in DBD.Activated carbon can be regenerated under the influence of strong oxidizing particlesand UV.(5) It is found that discharge voltage, electrode distance, power frequency,electrode time, activated carbon addition will influence on regeneration. theregeneration rate of activated carbon will be80.32%after60min with10kV dischargevoltage,10mm electrode distance,10kHz power frequency,2.0g the quality ofactivated carbon.(6) According to LC-MS analysis of test results, the intermediate of anilinedegradation with DBD is ethyleniminoquinone, p-benzoquinone and maleic acid.During the reaction, large amounts of·OH and O3will attack N-H bond and C-H bond.First of all, aniline is degraded to ethyleniminoquinone, secondly,ethyleniminoquinone is degraded to p-benzoquinone，finally, p-benzoquinone isoxidized to maleic acid further.