| Title: | Effect and mechanism of microwave-activated ultraviolet-advanced oxidation technology for adsorbent regeneration |
| Author(s): | Sun Y; Zheng T; Zhang G; Zheng Y; Wang P; |
| Address: | "School of Environment, Harbin Institute of Technology, Harbin, 150090, China. School of Environment, Harbin Institute of Technology, Harbin, 150090, China. zhengtong@hit.edu.cn. State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150090, China" |
| Journal Title: | Environ Sci Pollut Res Int |
| DOI: | 10.1007/s11356-017-0320-8 |
| ISSN/ISBN: | 1614-7499 (Electronic) 0944-1344 (Linking) |
| Abstract: | "To decrease the secondary pollution of volatile organic compounds (VOCs) during adsorbent regeneration by microwave, electrodeless lamp was added in the microwave field to oxidize VOCs in the gas phase. Ultraviolet has a significant improvement on mineralization of VOCs generated from adsorbate during adsorbent regeneration. However, the mechanism and main influence factors on the degradation of VOCs are not clear. The effect of microwave power, regeneration time, airflow rate, and humidity content on the mineralization of adsorbed tetracycline during adsorbent regeneration was studied. Ozone concentration and ultraviolet irradiation intensity were also measured to analyze the mechanism of the microwave-ultraviolet adsorbent regeneration method. Although the electrodeless lamp adsorbed microwave and competed with the regenerated adsorbent, the mineralization percentage of tetracycline increased about 10% with the presence of electrodeless lamp at the same microwave power supply. Besides, humidity content also takes an important role on enhancing the mineralization of tetracycline. The mineralization of tetracycline in the microwave-ultraviolet field consists of three major parts: pyrolysis, ozone oxidation, and free radical oxidation. More than 50% adsorbed tetracycline can be oxidized into H(2)O and CO(2) during regeneration in 5 min. These results support the potential use of electrodeless lamp to treat VOCs in the gas phase to decrease the risk of secondary pollution during adsorbent regeneration" |
| Keywords: | Adsorption Air Pollutants/*analysis Charcoal/chemistry/*radiation effects *Microwaves Oxidation-Reduction Ozone/chemistry *Ultraviolet Rays Volatile Organic Compounds/*analysis Adsorbent Microwave Oxidation Regeneration Tetracycline Ultraviolet; |
| Notes: | "MedlineSun, Yanlong Zheng, Tong Zhang, Guangshan Zheng, Yunli Wang, Peng eng 51678185/National Natural Science Foundation of China/ B2016005/Natural Science Foundation of Heilongjiang Province/ HIT.NSRIF.2017060/Fundamental Research Funds for the Central Universities/ Germany 2017/10/17 Environ Sci Pollut Res Int. 2018 Jan; 25(1):290-298. doi: 10.1007/s11356-017-0320-8. Epub 2017 Oct 15" |
