School of Environmental Science and Engineering, North China Electric Power University, Baoding 071003, PR China.
School of Environmental Science and Engineering, North China Electric Power University, Baoding 071003, PR China.
J Hazard Mater. 2016 Nov 15;318:224-232. doi: 10.1016/j.jhazmat.2016.06.052. Epub 2016 Jun 27.
SO2 and NO have caused serious haze in China. For coping with the terrible problem, this paper proposed a novel advanced oxidation process of ultraviolet (UV) catalyzing vaporized H2O2 for simultaneous removal of SO2 and NO. Effects of various factors on simultaneous removal of SO2 and NO were investigated, such as the mass concentration of H2O2, the UV energy density, the UV wavelength, the H2O2 pH, the temperatures of H2O2 vaporization and UV-catalysis, the flue gas residence time, the concentrations of SO2, NO and O2, and radical scavenger. The removal efficiencies of 100% for SO2 and 87.8% for NO were obtained under the optimal conditions. The proposed approach has some superiorities, i.e. less dosage and high utilization of oxidant, short flue gas residence time and inhibiting the competition between SO2 and NO for oxidants. The results indicated that the desulfurization process was dominated by the absorption by HA-Na, whereas the denitrification was primarily affected by the H2O2 dosage, UV energy density and H2O2 pH. Interestingly, an appropriate amount of SO2 was beneficial for NO removal. The reaction mechanism was speculated based on the characterizations of removal products by XRD, FT-IR and IC.
SO2 和 NO 导致中国出现严重雾霾。为应对这一可怕问题，本文提出了一种新颖的高级氧化工艺，即紫外（UV）催化水蒸气蒸发同时去除 SO2 和 NO。考察了各种因素对 SO2 和 NO 同时去除的影响，如 H2O2 的质量浓度、UV 能量密度、UV 波长、H2O2 的 pH 值、H2O2 蒸发和 UV 催化温度、烟道气停留时间、SO2、NO 和 O2 的浓度以及自由基清除剂。在最佳条件下，SO2 的去除率达到 100%，NO 的去除率达到 87.8%。该方法具有氧化剂量少、氧化剂利用率高、烟道气停留时间短、抑制 SO2 和 NO 竞争氧化剂等优点。结果表明，脱硫过程主要由 HA-Na 吸收控制，而脱硝主要受 H2O2 用量、UV 能量密度和 H2O2 pH 值的影响。有趣的是，适量的 SO2 有利于 NO 的去除。通过 XRD、FT-IR 和 IC 对去除产物的表征，推测了反应机理。
