Preparation Of Lanthanide Photocatalysts And Application Of Photoelectrocatalytic Technology In The Removal Of Gaseous Nitrogen Oxides

Since the beginning of the 21 st century,the global air pollution problem has aroused widespread concern in the world,there are two major issues to be solved urgently-environmental pollution and energy shortages.How to better and more effectively mitigate these two problems has become a new topic of more and more scientific research workers.Water pollution and air pollution are already the main environmental pollution problems,especially in recent years,serious air pollution,making the human living environment and physical health caused a major threat.China's energy to coal-based,China's coal use increased year by year,was a straight line.Nitrogen oxide emissions are also increasing year by year and catching up with carbon dioxide emissions.Every year the world directly to the atmosphere inside the nitrogen oxides more than 30 million tons,and there is a rising trend.The harm of nitrogen oxides is mainly manifested in the following aspects: harm to human health;restricting the survival and growth of plants;destruction of the ozone layer;the formation of acid rain and acid mist;participation in the production of photochemical smog.Therefore,it is necessary to treat nitrogen oxides.This paper is mainly to reduce the amount of nitrogen oxides in the air to do research.Semiconductor photocatalytic technology has attracted much attention because of its potential application in environmental purification and energy regeneration.Semiconductor adsorbent caused widespread interest in the scientific community for two main reasons: First,can quickly adsorb certain pollutants;Second,the use of photocatalytic technology to these pollutants degradation,will not cause secondary pollution to the environment.In the field of research,TiO₂ because of its strong photocatalytic ability,non-toxic,and easy to get,low cost,has been a high degree of concern.But because of its wide bandgap width,can only absorb the wavelength of the shorter ultraviolet light,the use of sunlight is very low efficiency.Bismuth tungstate?Bi₂WO₆?is a novel visible-light-responsive photocatalytic material with narrow band gap?2.7 eV?narrower than the band gap?3.2 eV?of TiO₂ and has good light both in both ultraviolet and visible light Catalytic activity,can effectively degrade organic pollutants in the atmosphere and waste water,has been widely concerned by the researchers.At the same time,bismuth tungstate as a simple oxide with a layered structure,electrons and holes of the high composite rate seriously inhibited its photocatalytic performance.Through the coordinated photocatalytic technology and electrocatalytic technology,the use of external constant potential or constant current forced electrons to move,to avoid electron and hole recombination,can extend the life of holes,the catalyst fixed to the electrode substrate,to solve the separation of the catalyst fixed Problem,easy to recycling,in order to solve environmental pollution,to achieve efficient purification of power plant tail gas,providing an efficient,safe,economical governance path.The research contents of this paper are divided into the following parts:1.Bi₂WO₆ was prepared by hydrothermal method.The Bi@WO₃was prepared by hydrothermal reduction.Bi@WO₃ activity was measured by controlling the synthesis temperature and calcination time.The precursor was prepared at 180 degree hydrothermal condition.Hydrogenation of NO at 500? for 2 h was the best.At the same time,the metal Bi has the plasmon effect,and the tungsten oxide nanostructures have high concentration of oxygen vacancies to enhance the visible photocatalytic reaction and promote the oxidation of NO2.In this paper,bismuth tungstate composite nanomaterials grown on FTO conductive glass were prepared by hydrothermal method using bismuth pentahydrate and sodium tungstate as raw materials.The photocatalytic oxidation of NO performance study.The reaction rate and catalytic activity of this composite nanomaterials are improved obviously because the electrons are directed to move by the addition of constant voltage,which reduces the electron and hole recombination rate and improves the visible light activity.At the same time,the catalyst is fixed on the base to effectively solve the powder catalyst separation and fixing problems,is conducive to repeated recycling.3.The experimental results show that the prepared ZnxCuS-GO/C60 photocatalytic material has a good ability to hydrolyze hydrogen,GO can effectively improve the electron transport efficiency,C60 can improve the stability of the material,and surface electron Enrichment efficiency.Effectively improve the photocatalytic activity.