Department of Civil and Environmental Engineering, Indian Institute of Technology Tirupati, Yerpedu 517619, India.
Department of Physics & CAMOST, Indian Institute of Technology Tirupati, Yerpedu 517619, India.
J Hazard Mater. 2023 Mar 15;446:130639. doi: 10.1016/j.jhazmat.2022.130639. Epub 2022 Dec 21.
The study describes developing an energy-efficient and scalable alternative to conventional non-thermal plasma systems by integrating surface dielectric barrier discharge (SDBD) and UV-C radiation sources. The unprecedented enhancement in the mineralisation rate of an azo dye (brilliant red 5B) by the hybrid reactor (photo-SDBD) is demonstrated thoroughly as a function of dye concentrations, pH, and background salts. The photo-SDBD is 1.25 - 4.9 times more energy efficient than SDBD under similar experimental conditions. The photo-SDBD could overcome the problems such as the recombination of hydroxyl radicals and scavenging of radicals by salts (NaCl, NaSO, NaCO) observed in conventional non-thermal plasma systems. The TOC and HR-MS analysis establish the complete mineralisation potential and chemical mineralisation pathway. Besides, the phytotoxicity of the treated water is tested and demonstrated its utility as a liquid fertiliser for enhanced germination of mung bean seeds. The optical emission spectroscopy measurements were performed to estimate the plasma's electron temperature (1.6 ± 0.2 eV) and density (10/m). The emission line ratio (I/I) approach is used to compare the influence of UV-C on plasma parameters in the SDBD reactor. The study opens a new pathway for developing energy-efficient and scalable plasma-assisted mineralisation of complex and emerging organic pollutants.
本研究通过整合表面介质阻挡放电（SDBD）和 UV-C 辐射源，开发了一种节能且可扩展的替代传统非热等离子体系统的方法。作为功能的染料浓度、pH 值和背景盐的函数，彻底展示了混合反应器（光-SDBD）对偶氮染料（亮红 5B）矿化率的空前提高。在类似的实验条件下，光-SDBD 的能量效率比 SDBD 高 1.25-4.9 倍。光-SDBD 可以克服传统非热等离子体系统中观察到的羟基自由基重组和自由基被盐（NaCl、NaSO、NaCO）清除等问题。TOC 和 HR-MS 分析建立了完全矿化潜力和化学矿化途径。此外，还测试了处理水的植物毒性，并证明其可用作液体肥料，以增强绿豆种子的发芽。进行了光谱发射测量以估计等离子体的电子温度（1.6±0.2 eV）和密度（10/m）。发射线比（I/I）方法用于比较 UV-C 对 SDBD 反应器中等离子体参数的影响。该研究为开发节能且可扩展的等离子体辅助复杂和新兴有机污染物矿化开辟了新途径。
