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基于OH自由基的强氧化性(2.8V)及脉冲放电等离子体(pulsed discharge plasma,PDP)与活性炭(activated carbon,AC)联合体系的协同作用,依托于光谱检测技术简单、准确性高、灵敏度高等优点,利用发射光谱技术测量了以O_2作为载气的PDP/AC联合体系中产生的OH自由基的相对发射光谱,用以表征体系中OH自由基相对生成量的变化。通过考察PDP水处理体系中不同AC添加量、脉冲峰值电压、电极间距对OH自由基相对发射光谱强度的影响,分析了影响OH自由基生成量的因素;通过比较,分析去离子水和酸性橙II(acid orange,AO7)溶液中OH自由基发射光谱强度的变化规律,表征了OH自由基生成量的变化,以说明PDP/AC的协同作用机理及OH自由基对有机物的氧化作用。研究结果表明,增加AC的添加量可以增强其在PDP体系中的催化效果,导致PDP/AC联合体系中OH自由基的相对发射光谱强度的增加;随着脉冲峰值电压的升高,注入PDP体系中的能量增加,从而增加了体系中OH自由基的产量;电极间距增加导致PDP体系能量效率降低,降低了OH自由基的产生量;无论是以去离子水还是以AO7溶液为溶液相,PDP/AC联合体系中OH自由基的产量均高于其在单独PDP体系中的生成量,且在PDP/AC联合体系和单独的PDP作用体系中,去离子水中OH自由基的相对发射光谱强度均高于其在AO7溶液中的强度值,这证明了AC对PDP体系中OH自由基生成的协同作用和有机物对OH自由基的消耗。
The synergistic effect of OH radical-based strong oxidizing (2.8V) and pulsed discharge plasma (PDP) and activated carbon (AC) combined systems relies on simple spectral detection techniques with high accuracy and sensitivity The relative emission spectra of OH radicals generated in the PDP / AC combined system using O 2 as carrier gas were measured by emission spectroscopy to characterize the change of the relative amount of OH radicals generated in the system. The influence of different AC dosage, pulse peak voltage and electrode spacing on the relative emission intensity of OH radical in PDP water treatment system was investigated. The factors influencing the formation of OH radicals were analyzed. Deionized water and acid orange II (acid orange, AO7) solution of OH radical emission spectrum intensity changes, characterized by changes in the amount of OH radicals generated to illustrate the synergistic effect of PDP / AC and OH radicals on the oxidation of organic matter. The results show that increasing the amount of AC can enhance its catalytic effect in PDP system and lead to the increase of relative emission spectrum intensity of OH radical in PDP / AC combination system. With the increase of pulse peak voltage, it injects into PDP system In the increase of the energy, thereby increasing the OH radical production in the system; electrode spacing increases lead to lower energy efficiency of the PDP system, reducing the amount of OH radicals generated; whether it is deionized water or AO7 solution phase, the PDP / AC combined system is higher than that in a single PDP system, and the relative emission intensity of OH radicals in the deionized water in the PDP / AC combined system and the separate PDP system Higher than its intensity in AO7 solution, demonstrating the synergistic effect of AC on OH radical generation in the PDP system and the depletion of OH radicals by organics.