NOx (NO and NO₂) are air toxins that endanger life and represent a hazard to the environment, such as photochemical smog, global warming, acid rain, ozone depletion, and the occurrence of respiratory infections. Some technological strategies to diminish NOx emissions to meet regulations depend on two techniques: the dry process and the wet process. This study applies polyvinylidene fluoride (PVDF) hollow fiber membrane modules as a medium to remove NOx from solutions containing several absorbents such as hydrogen peroxide and nitric acid (H₂O₂-HNO₃) solutions, sodium chlorite and sodium hydroxide (NaClO₂-NaOH) solutions, and sodium chlorate and sodium hydroxide (NaClO₃-NaOH) solutions. The experimental results showed that the oxidant’s strength influences NOx removal efficiency, where the absorbent solutions containing hydrogen peroxide had the highest removal efficiency as hydrogen peroxide is the most potent oxidant, followed by sodium chlorite and sodium chlorate. The three pairs of absorbents also gave a high NOx removal efficiency (above 90%), which means that all the absorbents used in the study are very potential to be used to diminish NOx via the wet process. NOx removal efficiency at the same feed gas flow rate increased as the number of fiber and absorbent concentrations is increased. However, NOx removal efficiency is reduced as the feed gas flow rate is increased at the same membrane module and absorbent concentration.

中文翻译：

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吸收剂对通过聚偏二氟乙烯 (PVDF) 中空纤维膜组件去除 NOx 的影响

NOx（NO和NO ₂）是危害生命和对环境造成危害的空气毒素，例如光化学烟雾、全球变暖、酸雨、臭氧消耗和呼吸道感染的发生。一些减少氮氧化物排放以满足法规的技术策略取决于两种技术：干法工艺和湿法工艺。本研究采用聚偏二氟乙烯 (PVDF) 中空纤维膜组件作为介质从含有多种吸收剂的溶液中去除 NOx，如过氧化氢和硝酸 (H ₂ O ₂ -HNO ₃ ) 溶液、亚氯酸钠和氢氧化钠 (NaClO ₂ - NaOH) 溶液，以及氯酸钠和氢氧化钠 (NaClO ₃-NaOH) 溶液。实验结果表明，氧化剂的强度影响NOx的去除效率，其中含过氧化氢的吸收剂溶液去除效率最高，因为过氧化氢是最有效的氧化剂，其次是亚氯酸钠和氯酸钠。三对吸收剂还具有很高的 NOx 去除效率（90% 以上），这意味着研究中使用的所有吸收剂都非常有可能用于通过湿法去除 NOx。随着纤维数量和吸收剂浓度的增加，在相同进料气体流速下的 NOx 去除效率增加。然而，在相同的膜组件和吸收剂浓度下，随着进料气体流速的增加，NOx 去除效率降低。