In the present study,a combination of pulsed discharge plasma and TiO_2(plasma/TiO_2)has been developed in order to study the activity of TiO_2by varying the discharge conditions of pulsed voltage,discharge mode,air flow rate and solution conductivity.Phenol was used as the chemical probe to characterize the activity of TiO_2in a pulsed discharge system.The experimental results showed that the phenol removal efficiency could be improved by about 10%by increasing the applied voltage.The phenol removal efficiency for three discharge modes in the plasma-discharge-alone system was found to be highest in the spark mode,followed by the spark–streamer mode and finally the streamer mode.In the plasma/TiO_2system,the highest catalytic effect of TiO_2was observed in the spark–streamer discharge mode,which may be attributed to the favorable chemical and physical effects from the spark–streamer discharge mode,such as ultraviolet light,O_3,H_2O_2,pyrolysis,shockwaves and high-energy electrons.Meanwhile,the optimal flow rate and conductivity were 0.05 m^3l^(-1)and 10μS cm^(-1),respectively.The main phenolic intermediates were hydroquinone,catechol,and p-benzoquinone during the discharge treatment process.A different phenol degradation pathway was observed in the plasma/TiO_2system as compared to plasma alone.Analysis of the reaction intermediates demonstrated that p-benzoquinone reduction was selectively catalyzed on the TiO_2surface.The effective decomposition of phenol constant(D_e)increased from 74.11%to 79.16%when TiO_2was added,indicating that higher phenol mineralization was achieved in the plasma/TiO_2system.
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机译:Arthrodesis and arthroplasty of the first metatarsophalangic joint in the treatment of Hallux Rigidus - comparative study of appropriately selected patients
机译:Arthrodesis and arthroplasty of the first metatarsophalangic joint in the treatment of Hallux Rigidus - comparative study of appropriately selected patients?
机译:Yi-bing Fang方—兵,Zhongri jindai gangtie jishushi bijiao yanjiu: 1868-1933中日近代钢铁技术史比较研究: 1868-1933 [The History of Iron and Steel Technology in Modern China and Japan, 1868-1933: A Comparative Study] China: Shandong Education Press, 2013. 283 pp. RMB ¥ 50.
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