School of Civil and Environmental Engineering, Kumoh National Institute of Technology, 1 Yangho-dong, Gumi, 730-701, Republic of Korea.
Soil Environment Center, Korea Environmental Industry & Technology Institute, 215 Jinheungno, Eunpyeonggu, Seoul, Republic of Korea.
J Environ Manage. 2018 Jan 15;206:77-84. doi: 10.1016/j.jenvman.2017.10.024. Epub 2017 Oct 20.
In this study, a combination of phosphorus (PP) oxoanions in a submerged plasma irradiation (SPI) system was used to enhance the removal efficiency of dyes from wastewater. The SPI system showed synergistic methylene blue removal efficiency, due to the plasma irradiation and Fenton-like oxidation. The ferrous ions released from the iron electrode in the SPI system under plasmonic conditions form complexes with the PP anions, which can then react with dissolved oxygen (O) or hydrogen peroxide (HO) via Fenton-like reactions. The experimental results revealed that a sodium triphosphate (TPP) combined SPI system has a higher dye removal efficiency than a tetrasodium pyrophosphate (DP) or a sodium hexametaphosphate (HMP) combined SPI system under similar dissolved iron ion concentrations. To confirm the accuracy of the proposed removal mechanism via Fenton-like oxidation, it was compared to SPI systems under an oxygen environment (TPP/SPI/O (k = 0.0182 s)) and a nitrogen environment (TPP/SPI/N (k = 0.0062 s)). The results indicate that the hydroxyl radical (OH) in the TPP/SPI/O system is the major oxidant in methylene blue removal, because the dye degradation rates dramatically decreased with the addition of radical scavengers such as tert-butanol (k = 0.0023 s) and methanol (k = 0.0021 s). On the other hand, no change was observed in the methylene blue removal efficiency of the TPP/SPI/O system when it was subjected to a wide range of pHs (3-9). In addition, it was proved that this system could be used to eliminate six different commercial dyes. The results of this study indicated that the TPP/SPI/O system is a promising advanced oxidation approach for dye wastewater treatment.
在这项研究中，将磷（PP）氧阴离子与浸没式等离子体辐照（SPI）系统结合使用，以提高废水处理中染料的去除效率。SPI 系统由于等离子体辐照和类 Fenton 氧化作用，表现出协同亚甲基蓝去除效率。在等离子体条件下，SPI 系统中的铁电极释放出的亚铁离子与 PP 阴离子形成配合物，然后通过类 Fenton 反应与溶解氧（O）或过氧化氢（HO）反应。实验结果表明，在类似溶解铁离子浓度下，与四磷酸钠（DP）或六偏磷酸钠（HMP）联合 SPI 系统相比，三聚磷酸钠（TPP）联合 SPI 系统具有更高的染料去除效率。为了确认通过类 Fenton 氧化提出的去除机制的准确性，将其与在氧气环境下的 SPI 系统（TPP/SPI/O（k = 0.0182 s））和氮气环境下的 SPI 系统（TPP/SPI/N（k = 0.0062 s））进行比较。结果表明，TPP/SPI/O 系统中的羟基自由基（OH）是亚甲基蓝去除的主要氧化剂，因为添加自由基清除剂如叔丁醇（k = 0.0023 s）和甲醇（k = 0.0021 s）后，染料降解速率急剧下降。另一方面，当 TPP/SPI/O 系统的 pH 值在 3-9 范围内变化时，亚甲基蓝去除效率没有变化。此外，证明该系统可用于消除六种不同的商业染料。本研究结果表明，TPP/SPI/O 系统是一种有前途的高级氧化方法，可用于处理染料废水。
