超重力场中共存物质对O3/H2O2工艺降解硝基苯的影响

以硝基苯为模拟污染物，研究了常见无机钠盐和有机物在超重力场中对O3/H2O2工艺降解硝基苯的影响，同时考察了超重力技术强化O3/H2O2工艺降解硝基苯的作用机理。结果表明超重力技术通过强化臭氧传质速率提高臭氧溶解量进而提高硝基苯的去除率。超重力场中共存物对硝基苯的降解动力学产生不同的影响，其中碳酸钠、氢氧化钠、磷酸钠、硫酸钠和硝酸钠对硝基苯的去除具有促进作用，主要作用原理是添加物可升高溶液pH值进而促进臭氧分解产生羟基自由基(·OH)提高了氧化效率；氯化钠、碳酸氢钠、硫酸氢钠、乙醇、乙酸、甲酸和叔丁醇对硝基苯的去除具有抑制作用，其中添加硫酸氢钠、乙酸和甲酸使溶液pH值降低阻碍了自由基链反应的进行，而氯化钠、碳酸氢钠、乙醇和叔丁醇可消耗·OH，从而对硝基苯去除产生抑制作用。

Effects of Coexisting Substances on Nitrobenzene Degradation with O3/H2O2 Process in High-Gravity Fields

This study used nitrobenzene as the simulation pollutant to study the effects of common inorganic sodium salts and organics on nitrobenzene degradation by O3/H2O2 in high-gravity fields. The experiment results showed that high-gravity technology improved the nitrobenzene removal rate by improving ozone transfer efficiency and ozone dissolution. Coexisting substances had different effects on the degradation kinetics of nitrobenzene in high-gravity fields. Among such substances, Na2CO3, NaOH, Na3PO4, and NaNO3 accelerated the removal of nitrobenzene removal. The main action principle is that additives can increase the pH of the solution, stimulate ozonolysis, generate hydroxyl radicals (·OH), and improve oxidation efficiency. By contrast, NaCl, NaHCO3, NaHSO4, ethanol C2H5OH, acetic acid CH3COOH, formic acid HCOOH, and tert-Butyl alcohol (TBA) inhibitted nitrobenzene removal. When NaHCO3, CH3COOH, or HCOOH were added, the pH of the solution decreased and free radical chain reactions were hindered. However, NaCl, NaHCO3, C2H5OH, and TBA consumed ·OH and inhibited nitrobenzene removal.