活性炭辅助双液后介质阻挡放电等离子体反应器处理阴离子染料分解

中文摘要 AI 辅助

非热等离子体（NTP）技术，包括介质阻挡放电（DBD）反应器，已成为处理工业废水中持久性有机污染物的有效高级氧化工艺（AOP）。基于此目标，本研究构建了双液介质阻挡放电等离子体反应器，并以放电后配置模式用于降解包含活性红120、刚果红和甲基橙的三元阴离子染料混合物。可调节长度的外液体电极（接地）为控制放电长度和冷却提供了灵活性，从而实现更高的降解效率和更优的反应器稳定性。导电液体高压电极（填充导电溶液的介质管）有助于减轻放电区域活性物种导致的金属腐蚀与氧化。本研究在活性炭（AC）存在的情况下，对三元阴离子染料混合物（模拟染料废水样品）的降解进行了详细探究，以挖掘放电后处理的潜在应用。颗粒状活性炭可提升碱性溶液中三元阴离子染料混合物的降解速率，但在酸性或中性溶液中无此效果。在分析紫外-可见吸收光谱后，对酸性和碱性溶液中三元阴离子染料混合物的降解反应动力学开展了对比研究，还探究了溶液pH、活性炭颗粒的质量与尺寸、染料浓度、活性炭重复使用等其他参数对降解效率的影响。降解机制经阐明为：放电后处理过程中，活性炭表面形成强氧化剂（羟基自由基）；但在酸性或中性阴离子染料溶液中，降解机制以臭氧为主导。

英文摘要

Non-thermal Plasma (NTP) technology, including the Dielectric Barrier Discharge (DBD) reactor, has emerged as an effective advanced oxidation process (AOP) for treating persistent organic pollutants in industrial wastewater. Based on this objective, a dual-liquid dielectric-barrier-discharge plasma reactor was built and used to degrade a ternary anionic dye mixture comprising Reactive Red 120, Congo Red, and Methyl Orange in its post-discharge configuration. The adjustable length of the outer liquid electrode (grounded) provides flexibility in controlling the discharge length and cooling, thereby achieving higher degradation efficiency and greater reactor stability. The conducting-liquid high-voltage electrode (a dielectric tube filled with a conductive solution) helps mitigate metal corrosion and oxidation caused by reactive species in the discharge zone. A detailed study of the degradation of ternary anionic dye mixtures (simulated dye wastewater samples) in the presence of activated carbon (AC) was performed to explore the potential applications of post-discharge treatment. The activated carbon (granules) enhances the degradation rate of ternary anionic dye mixtures in basic solutions rather than in acidic or neutral solutions. A comparative study of the degradation reaction kinetics of the ternary anionic dye mixtures in acidic and basic solutions was conducted after analyzing UV-Vis absorption spectra. The role of other parameters, such as solution pH, the mass and size of AC particles, dye concentrations, and AC reuse, was investigated in relation to degradation efficiency. The degradation mechanism was elucidated by the formation of strong oxidizer (hydroxyl radicals) on the surface of activated carbon during post-discharge treatment. However, in acidic or neutral anionic dye solutions, the degradation mechanism was dominated by ozone.

发表机构

• Mar Thoma College for Women（玛尔·多马女子学院）
• University of Delhi（德里大学）

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