光电催化净化、转化烟气中SO2和NO的研究

燃煤烟气中SO2和NO的排放导致了严重的空气污染。常规脱硫脱硝技术需要吸附剂，氨水，高温，催化剂等多种条件，成本高，有二次污染，且忽视了他们的资源化利用。项目提出了基于光电催化技术的双室电化学反应池催化系统，可将SO2和NO分别氧化和还原为SO42-和NH4+，从而实现同步脱硫脱硝并获得(NH4)2 SO4的资源化处置思路。项目通过可持续催化氧化SO32-的高效、稳定、可见光响应的F-Fe2O3光阳极和高活性气体扩散催化阴极的制备，并利用PVC硅电极，构建双室自偏压光电化学体系，通过揭示自由基催化反应特性及其与电极材料、反应器、反应体系间的关系，阐明SO2氧化和NO还原的吸附和催化反应机制，并建立调控方法。本项目发挥了SO2的氧化反应和NO的还原反应协同进行的特点，处理过程常温，常压，只需太阳能，反应产物为(NH4)2 SO4，无二次污染，为烟气同步脱硫脱硝及资源化利用提供了新的方法。

The large amount of SO2 and NO emissions in flue gas has caused serious air pollution. However, conventional desulfurization and denitrification technologies usually require a variety of conditions such as adsorbent, ammonia, high temperature and catalyst, which have high operating cost and easy to generate secondary pollution. On the other hand, SO2 contains high chemical energy and NO can be used as a nitrogen source, nevertheless traditional methods ignore their resource utilization. Therefore, the project proposes a dual-chamber electrochemical catalytic system based on self-biased photoelectrocatalysis technology, which can adsorb and oxidize SO2 to SO42- in the anode chamber, meanwhile adsorb and reduce NO to NH4+ in the cathode chamber, so as to achieve simultaneous desulfurization, denitrification and resource recovery of obtaining (NH4)2SO4. Through the preparation of highly efficient, stable and visible light-responsive F-Fe2O3 photoanode for sustainable-catalytic oxidation of SO32-, the preparation of highly active Pt-modified gas diffusion catalytic cathode and the use of PVC silicon electrode, a dual-chamber self-biased photoelectrochemical system was constructed to process SO2 and NO simultaneously. According to revealing the characteristics of free radical catalytic reaction and its relationship with electrode materials, reactors, and reaction systems, the adsorption and catalytic reaction mechanism of SO2 oxidation and NO reduction will be clarified and a control method will also be established. This project takes full advantage of the synergistic characteristics of SO2 oxidation and NO reduction reaction. The treatment process is at normal temperature and pressure, which just needs to provide solar energy. The reaction product is (NH4)2SO4, which is no secondary pollution. To sum up, this project provides a new technical direction in simultaneous desulfurization and denitrification of flue gas for resource utilization.