Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8850551 | Chemosphere | 2018 | 36 Pages |
Abstract
Textile wastewater is characterized by high toxicity, complex structure, and resistance to biodegradation. Therefore, advanced oxidation technologies have received extensive attention. However, it is usually difficult to achieve a desired degradation effect using a single technology. The combination of various advanced oxidation technologies is an important way to achieve efficient degradation of organic wastewater. The present investigation was focused on ultrasound enhanced electrochemical oxidation (US-EO) of typical anthracene Alizarin Red S dye on a boron doped diamond anode. Our work indicates that ultrasonic oxidation technology which is mainly based on cavitation, can produce strongly oxidizing active substances such as OH, HO2, O, and H2O2, that accelerate the destruction of the dye molecular structure and achieve dye decolorization and mineralization. The effects on cavitation and decomposition of ARS by the parameters that affect degradation, including solution temperature, initial pH, and electrolytes, were examined. Results show that low temperature was more conducive to ultrasonic cavitation in the US-EO process; the degradation efficiency rate of EO was higher than that of US-EO when the solution temperature was above 45â¯Â°C. Ultrasonic cavitation was significantly more efficient in acid than in alkaline conditions. Almost 100% color removal and 86.07% COD removal was achieved for 100â¯mgâ¯Lâ1 ARS concentration with a 0.05â¯M Na2SO4 electrolyte, temperature of 30â¯Â°C and pH of 4.97 after 3â¯h. GC-MS analysis showed that the intermediate products of ARS in the US-EO process were phthalic anhydride, PEAs and bisphenol A, which is eventually mineralized to CO2 and H2O.
Keywords
Related Topics
Life Sciences
Environmental Science
Environmental Chemistry
Authors
Chengwu Zhu, Chuqi Jiang, Shou Chen, Ruiqiong Mei, Xin Wang, Jun Cao, Li Ma, Bo Zhou, Qiuping Wei, Guangqi Ouyang, Zhiming Yu, Kechao Zhou,