Mechanism Study On Denitration Of Modified Activated Carbon By Advanced Oxidation Processes

China's annual total emission amount of nitrogen oxide,one of the most c ommon air pollutants,was more than 20 million tons,which impacts seriously the mankind life.The main source of NO emissions was coal-fired flue gas,s o that the flue gas denitration research has been imminent.As a new adsorben t material with a large surface area,activated carbon has become an important research of flue gas denitration adsorption agent carrier.However,the NO re moval rate of original carbon was limited,which needs to be modified to impr ove its physical and chemical adsorption properties and stability.The advanced oxidation processes?AOPs?can improving the catalytic activity of the materia ls by active free radical.In this study,based on the mechanism of denitration by activated carbon modified with AOPs,several kinds of modified materials with low cost and high efficiency were successfully prepared.This study has r ealized the synergistic effect between the adsorbability of bamboo charcoal and the oxidation of active free radical,which provides a new application prospe ct for dry denitration.Activated carbon fibers?ACF?was modified by composite photocatalysts o f TiO₂/Cu₂O,which was prepared by hydration hydrazine reduction.The results showed that the surface pore size of ACF has decreased as well as the C-C and C=O groups have increased after modified by TiO2/Cu₂O,which enhanced the adsorption capacity of ACF.The highes NO removal rate was 61.07 % at 40 ? under visible-light.Two systems of H₂O₂ and H₂O₂/Fe²⁺ were built in the study on ACF mod ified by Photo-Fenton?PF?technology.the H₂O₂/Fe²⁺ system modification can effectively improve the ability of NO adsorption.The adsorption affinity can b e improved after ammonia treatment as well as the surface nitrogen content ca n be increased.While,the denitration effect of photo Fenton system was not o bvious.The activated bamboo charcoal?BC?was modified by peroxymonosulfate?PMS?.The optimal conditions?20 ?,visible light?were determined,and the highest NO removal was achieved at 62.50 % when the intensity of visible lig ht was 10 A.After PMS modification,the increasement of specific surface are a,the reduction of carbonization,the decomposed basic and azo polyatomic rin g functional groups,and the more content of C=O and-COO groups have all proved the BC's stronger physical and chemical adsorption properties.NO can be oxidated into adsorbed NO2 with the presence of oxygen at low temperature,which shows a strong adsorption stability.In the part of study on denitration efficiency by heat-oxidized-treated bam boo charcoal,the simultaneous removal efficiencies of NO and NO2 were up t o 57.3 % and 71.1 % when the temperature was controlled at 1000 oC under the protection of nitrogen without oxidation.According to the characterization r esults,some functional groups have decomposed after heat treatment,such as C-C,C-O and-COO.The nitrogen-containing functional groups have generated under the protection of N₂,which enhanced the denitration efficiency.