Activation Of Peroxymonosulfate By Supported Graphite Carbon Nitride On Activated Carbon For The Degradation Of Acid Orange 7

Advanced oxidation techniques such as Fenton,Fenton and photocatalytic techniques are an effective way to degrade organic pollutants.Different from the hydroxyl radical（HO·）which is based on the Fenton technique,sulfate radical（SO₄^-·）has higher redox potentials so that it can degrade most of the organic pollutants effectively.Advanced oxidation technology which is based on sulfate radical has got more and more attention.Sulfate radical（SO₄^-·）can be excited by metal catalyst,heat,light and other methods through peroxodisulfate（PS）or hydrogen peroxide（PMS）production,but it also has the problem such as the loss of metal ions and high energy consumption defects.Now,the development of a new type of catalyst with low metal loss rate,no metal loss and no consumption of other energy sources has became a popular research topic.Graphite phase carbon nitride（g-C₃N₄）is a kind of organic polymer semiconductor photocatalyst,which can be used to activate PMS to degrade a variety of dye wastewater under visible light irradiation,but it has a low degradation efficiency for organic pollutants.The g-C₃N₄/AC catalyst was prepared in this paper,it is a loaded catalytic of nitride which can degrade organic dyes under the condition of no light.The effect of PMS on the photocatalytic degradation of acid orange（AO7）without light was studied.At the same time,in order to explore the principle of g-C₃N₄/AC catalyst for degradation of dyes,an inhibitor experiment and the electron paramagnetic resonance（EPR）was used to be determined the active groups which was generated in the reaction process,the principle of degradation could be illustrated.In addition,the effects of the reaction conditions on the catalytic efficiency and the stability of the catalyst were also studied.The main contents of this paper include:1.The g-C₃N₄/AC catalyst was prepared by in-situ synthesis.The results of the catalyst showed that the g-C₃N₄ was uniformly distributed in the AC and the research on the ability of organic pollutants’ degradation of the catalyst in the presence of PMS was investigated without light.In addition,g-C₃N₄ loaded to AC not only increasedthe specific surface area of g-C₃N₄/AC,but also increased the active site and contact area.2.This kind of metal-free supported carbon nitride catalyst activates PMS to have good degradation effect on the organic dye,and it can completely degrade AO7 and other pollutants in 20 min under no light condition.The loading of g-C₃N₄ has a large effect on the adsorption capacity and degradation ability of the catalyst,and it can efficiently activate the PMS catalyzed degradation dye at a large pH range and at a lower temperature.3.The reproducibility was also found to have high stability and reproducibility.It was found that the free radicals and free radicals could promote the degradation of dyes by PMS catalyzed by free radical inhibitors.