Photocatalytic Degradation Organic Pollutants Coupling With Hydrogen Production Through Graphite Carbon Nitride And Its Supported Fiber

With the rapid development of global economy,energy shortage and environmental pollution problems have aroused people's attention all over the world.Photocatalytic technology has been considered to be a good way to solve the problems mentioned above after the long-term exploration,which has the unique advantages:solar energy is the constant and inexhaustible source.Photocatalytic technology makes the various organic pollutants into the biodegradable small molecular substances so as to solve the problem of environmental pollution;when it comes to solve the energy shortage,photocatalytic water decomposition uses solar energy to make water evolution into hydrogen which is a clean energy.In terms of research status at present,the related researches about the environment treatment or energy development have made a lot of remarkable achievements,however,the environment problem and energy research can be solved at the same time by photocatalytic technology is less.Therefore,we want to establish a simple and feasible system to solve the environmental pollution problem and energy shortage problem at the same time:finding some suitable organic pollutants replaces the sacrificial agent which is a role in technology of photocatalytic water decomposition and the combination of photocatalytic oxidation technology and photocatalytic decomposition of water technology can achieve the purpose that the organic pollutants are oxidated and the water decomposition is promoting at the same time.This article selects a free metal catalyst which is powder-graphite carbon nitride?g-C₃N₄?.It can be used to deal with environment pollution problems and solve the energy shortage problem by splitting water to hydrogen.Though its quantum efficiency is low,its absorption in the visible area is strong and it has good application prospect in the two aspects mentioned above.In this article,graphite carbon nitride is loaded by the precious metal of Pt through photodeposition method.It was verified that the photoelectrochemical properties were improved by Pt by using ultraviolet diffuse?DRS?,fluorescence spectroscopy?PL?and optical current test.We can find Pt⁴⁺has been reduced into Pt²⁺and Pt⁰ completely by X-ray photoelectron spectroscopy?XPS?.Meanwhile,it also explains that Pt⁰ plays an important role in accelerating the evolution of hydrogen.Then we chose different alcohols and the materials with hydroxyl as the substrates to explore the reaction in which pollutants in water can be degraded and generation of hydrogen can be promoted at the same time.Finally,this article chooses a kind of typical and the most representative of organic pollution-roxithromycin?Rox?as the substrate to study the whole experiment process when the Pt/g-C₃N₄ is the photocatalyst.Meanwhile,we also examine the content of the substrates and other influences of reaction.The degradation pathway of Roxithromycin?Rox?was explored by the liquid-mass spectrometry?UPLC-MS?.Finally,the mechanism of the reaction can be got through the degradation pathway of Rox.In order to solve the problem of powder catalysts in recycling and reusing difficultly,this paper use the centrifugal spinning technology to load the graphite carbon nitride onto polyacrylonitrile?PAN?,then through polyethylene glycol?PEG?to form porous structure and improve the catalytic performance.In this article,we use the scanning electron microscope?SEM?and transmission electron microscopy?TEM?analysis techniques for a series of characterization of catalysts.Finally we found that the preparation of fiber is loaded by graphite carbon nitride and it has obvious and uniform holes.Then we investigated g-C₃N₄/PEG-PAN photocatalytic water decomposition into hydrogen and the influence of organic pollutants Rox.Finally,comparing the performance of the two kinds of catalyst above,the photocatalytic material not only has good usability and recyclability,but also its catalytic performance is similar to powder catalyst,and it shows good physical properties and chemical properties.A series of studies also show that it provides a new train of thought to solve the problem of environment and energy issues in the future.