Study on the Degradation of Phenol Wastewater Using Hydroxyl Radical Produced by Plasma and the Course by UV Spectra
YANG Xian-li, BAI Min-dong, HAN Feng, GU Jian-long
Key Laboratory of Strong Electric-Field Ionization Discharge of Liaoning Province, Institute of Environmental Engineering, Dalian Maritime University, Dalian 116026, China
Abstract：The phenol wastewater with high concentration was treated by hydroxyl radical produced by a strong ionization discharge plasma in the present article. Salicylic acid used as molecular probe to determine the concentration of hydroxyl radical. The phenol elimination efficiency of wastewater whose initial concentration was 1 21 5 mg·L-1 could reach 99.11% when the concentration of hydroxyl radical was 1 037 mg·L-1; while the initial concentration of 8 853 mg·L-1 of phenol wastewater dropped to 6 250 mg·L-1 under the same conditions, that is, 1 mg hydroxyl radicals could oxidize 2.5 mg of phenol. The smaller the initial phenol concentration, the higher the removal. However, the higher the initial concentration, the greater the absolute quantity of treatment. And the relation between the changes including pH value and the conductivity and the concentration of hydroxyl radical was stated and explained. With the concentration of hydroxyl radicals increasing, the pH value of wastewater changed from close to neutral to acidity gradually. The higher the concentration of hydroxyl radical, the stronger the acidity of wastewater. When continuing the increase in the concentration of hydroxyl radical, the change began to smooth. With the addition of hydroxyl radical, as is different from other phenomena, there was a tiny descending stage before ascending as shown on the conductivity curve, indicating that phenol had been oxidized and generated the organic acids continuously. Catechol, hydroquinone and benzoquinone are the important compounds of the intermediate products as shown by the analysis of UV spectra and chromatography. The final UV spectra curve indicated that there were little organic compounds containing conjugated structure in the treated wastewater.
杨宪立,白敏冬,韩 凤,谷建龙. 等离子体制取羟自由基降解苯酚溶液及其历程的UV研究[J]. 光谱学与光谱分析, 2008, 28(11): 2649-2652.
YANG Xian-li, BAI Min-dong, HAN Feng, GU Jian-long. Study on the Degradation of Phenol Wastewater Using Hydroxyl Radical Produced by Plasma and the Course by UV Spectra. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2008, 28(11): 2649-2652.
[1] Peter Klan, Martin Vavrik. Journal of Photochemistry and Photobiology A: Chemistry, 2006, 177: 24. [2] Belhadj N Tahar, Savall A. Journal of Applied Electrochemistry, 1999, 29: 277. [3] Tennakoon C L K. Appl. Electrochem., 1996, 26: 99. [4] Andrzej Cybulski, Janusz Trawczynski. Water Environment Research, 2006, 78(1): 12. [5] YANG Shao-xia, FENG Yu-jie, WAN Jia-feng, et al(杨少霞，冯玉杰，万家峰，等). Chemical Journal of Chinese Universities(高等学校化学学报), 2005, 26(5): 897. [6] Asim K De, Basab Chaudhuri, et al. Journal of Hazardous Materials, B64, 1999: 91. [7] TONG Shao-ping, CHU You-qun, MA Chun-an, et al(童少平，褚有群，马淳安，等). Acta Scientiae Circumstantiae(环境科学学报)，2005, 25(8): 1041. [8] Julio A Zimbron1, Kenneth F Reardon. Water Research, 2005, 39: 865. [9] LIU Xiao-bo, LIN Hai-bo, SUN Zhi-quan, et al(刘小波, 林海波, 孙智权, 等). Spectroscopy and Spectral Analysis(光谱学与光谱分析), 2006, 26(6): 1141. [10] Zhang Zhitao, Bai Mindong, Bai Mindi, et al. IEEE Transactions on Plasma Science, 2006, 34(6): 2618. [11] Quan Xie, Zhang Yaobin, Chen Shuo, et al. Journal of Molecular Catalysis A: Chemical, 2007(263): 216. [12] Sano Noriaki, Fujimoto Tatsuya, Kawashima Toru, et al. Separation and Purification Technology, 2004, 37(2): 169. [13] Johnson Steve K, Houk Linda L, Feng Jianren, et al. Environmental Science and Technology, 1999, 33(15): 2638.
