State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, People's Republic of China.
State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, People's Republic of China.
J Hazard Mater. 2014 Apr 30;271:89-97. doi: 10.1016/j.jhazmat.2014.02.011. Epub 2014 Feb 18.
A simple and efficient method for simultaneous desulfurization and denitrification via vacuum ultraviolet (VUV) irradiation and with no additional chemicals is presented. The simultaneous removal of 90% SO2 and 96% NOx (NO+NO2) was achieved from the simulated flue gas under the irradiation from a low-pressure mercury lamp with main wavelengths of 185 and 254 nm, respectively. The composition, flow rate, and temperature of the simulated flue gas, as well as the VUV light intensity, were evaluated as the factors impacting on the efficiency of SO2 and NOx removal. The OH, HO2, O, and O3 produced from the photolysis of H2O and O2 were concluded as the major reactive oxygen species that oxidized SO2 and NOx. The additional OH and HO2 generated through the reactions of NO+HO2 and SO2+OH/HO2 improved treatment efficiency, while the oxidation products of NOx, e.g., NO2, HNO2, HNO3, and HNO4, consumed massive reactive oxygen species (such as O, OH, and HO2) and thereby reducing the removal efficiencies. The main reaction products were characterized as H2SO4 and HNO3 by ion chromatography, which could be used as chemical or fertilizer raw materials.
本文提出了一种无需添加额外化学物质即可通过真空紫外 (VUV) 辐照同时脱硫脱硝的简单高效方法。在主波长分别为 185nm 和 254nm 的低压汞灯辐照下，从模拟烟道气中同时去除了 90%的 SO2 和 96%的 NOx（NO+NO2）。模拟烟道气的组成、流量和温度以及 VUV 光强度被评估为影响 SO2 和 NOx 去除效率的因素。H2O 和 O2 的光解产生的 OH、HO2、O 和 O3 被认为是氧化 SO2 和 NOx 的主要活性氧物质。通过 NO+HO2 和 SO2+OH/HO2 的反应生成的额外 OH 和 HO2 提高了处理效率，而 NOx 的氧化产物（如 NO2、HNO2、HNO3 和 HNO4）消耗了大量的活性氧物质（如 O、OH 和 HO2），从而降低了去除效率。离子色谱分析表明，主要反应产物为 H2SO4 和 HNO3，可作为化学或肥料原料。
