HO-卤化物配合物协同紫外线-热催化法去除元素汞。
Elemental Mercury Removal by a Method of Ultraviolet-Heat Synergistically Catalysis of HO-Halide Complex.
机构信息
Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control, Department of Environmental Science and Engineering , North China Electric Power University , Baoding , 071003 , PR China.
MOE Key Laboratory of Resources and Environmental Systems Optimization, College of Environmental Science and Engineering , North China Electric Power University , Beijing , 102206 , PR China.
出版信息
Environ Sci Technol. 2019 Jul 16;53(14):8324-8332. doi: 10.1021/acs.est.9b01741. Epub 2019 Jul 5.
A novel method of ultraviolet-heat synergistically catalyzing HO-X (X: NaCl, NaBr, HCl, and HBr) for removal of elemental mercury (Hg) was developed. In terms of Hg removal efficiency and economy, HCl and HBr were the suitable additives. Hg removal efficiencies reached 93.6% for HO-HCl and 91.4% for HO-HBr, the concentrations of HO, HCl and HBr were 1 M, 4.2 mM and 0.5 mM. The doses of gaseous Cl and Br-oxidants were 6.27 and 0.75 ppm. The costs by using HO-HCl and HO-HBr were 1,180 USD/lb-Hg and 1,170 USD/lb-Hg. The best temperature for heat catalysis was 413 K. Hg removal was enhanced by 500 mg/m SO and 300 mg/m NO due to the formation of sulfuric and NO. Mercury distribution analyses indicated that 500 mg/m SO, 300 mg/m NO, and 6% O favored KCl retaining Hg. When the HO concentration was adjusted to 3 M, the simultaneous removal efficiencies of NO and Hg reached 83.7% and 99.2% for HO-HCl, and 82.8% and 98.8% for HO-HBr. Electron spin resonance demonstrated that ClOH•/BrOH• and Cl•/Br• played leading roles in Hg oxidation, besides Cl/Br. The mercury forms in spent KCl were HgCl, HgBr, and HgNO, according to X-ray photoelectron spectroscopy.
开发了一种新颖的紫外-热协同催化 HO-X（X：NaCl、NaBr、HCl 和 HBr）去除元素汞（Hg）的方法。就 Hg 去除效率和经济性而言，HCl 和 HBr 是合适的添加剂。HO-HCl 和 HO-HBr 的 Hg 去除效率分别达到 93.6%和 91.4%，HO、HCl 和 HBr 的浓度分别为 1 M、4.2 mM 和 0.5 mM。气态 Cl 和 Br-氧化剂的剂量分别为 6.27 和 0.75 ppm。使用 HO-HCl 和 HO-HBr 的成本分别为 1180 美元/lb-Hg 和 1170 美元/lb-Hg。热催化的最佳温度为 413 K。由于形成了硫酸和 NO，500 mg/m SO 和 300 mg/m NO 可增强 Hg 去除效果。Hg 分布分析表明，500 mg/m SO、300 mg/m NO 和 6% O 有利于保留 Hg 的 KCl。当 HO 浓度调整至 3 M 时，HO-HCl 和 HO-HBr 对 NO 和 Hg 的同时去除效率分别达到 83.7%和 99.2%，82.8%和 98.8%。电子顺磁共振表明，ClOH•/BrOH•和 Cl•/Br•除了 Cl/Br 之外，在 Hg 氧化中也起主导作用。根据 X 射线光电子能谱，废 KCl 中形成的汞形式为 HgCl、HgBr 和 HgNO。
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