TY - JOUR

T1 - 水处理光电催化反应器内部结构优化布设机理探讨

AU - Li, Kecheng

AU - Li, Mengkai

AU - Jensen, M. B.

AU - Qiang, Zhimin

PY - 2019

Y1 - 2019

N2 - The optimal layout of the internal structure of a photoelectrocatalytic (PEC) reactor is essential for the degradation of pollutants in water. In this work, blue TiO2 nanotube arrays electrode plates were prepared by an oxidation-reduction method. The influences of various layout factors of a PEC reactor on methylene blue (MB) degradation were investigated. Experimental results indicate that the MB degradation rate increased with the decreasing distance between the anode plate and the center of the light source, the decreasing rotation angle of the anode plate, and the increasing anode plate number. Further analysis results indicate that the influence of each layout factor on the MB degradation could all be ascribed to the ultraviolet (UV) fluence rate. The MB degradation rate shows a positively linear correlation with the UV fluence rate. The slope (0.00219) and intercept (0.0049) of the linear regression equation represent the relative efficiencies of UV photons used by anode catalytic oxidation and direct photolysis on MB degradation, respectively, and clarified the contribution of each reaction to the MB degradation rate. Moreover, comparison results of the PEC reactors with different inner diameters (64, 72 and 80 mm) show that a smaller inner diameter led to a faster MB degradation rate, but the PEC reactor with an inner diameter of 80 mm had the lowest consumption of electrical energy per order (EEO) for MB degradation (17.24 kWh•m-3•order-1). Finally, the contributions of anode catalytic oxidation and direct photolysis to the MB degradation rate in PEC reactors with various inner diameters were quantitatively analyzed, which provides important reference for the optimal design of a PEC reactor.

AB - The optimal layout of the internal structure of a photoelectrocatalytic (PEC) reactor is essential for the degradation of pollutants in water. In this work, blue TiO2 nanotube arrays electrode plates were prepared by an oxidation-reduction method. The influences of various layout factors of a PEC reactor on methylene blue (MB) degradation were investigated. Experimental results indicate that the MB degradation rate increased with the decreasing distance between the anode plate and the center of the light source, the decreasing rotation angle of the anode plate, and the increasing anode plate number. Further analysis results indicate that the influence of each layout factor on the MB degradation could all be ascribed to the ultraviolet (UV) fluence rate. The MB degradation rate shows a positively linear correlation with the UV fluence rate. The slope (0.00219) and intercept (0.0049) of the linear regression equation represent the relative efficiencies of UV photons used by anode catalytic oxidation and direct photolysis on MB degradation, respectively, and clarified the contribution of each reaction to the MB degradation rate. Moreover, comparison results of the PEC reactors with different inner diameters (64, 72 and 80 mm) show that a smaller inner diameter led to a faster MB degradation rate, but the PEC reactor with an inner diameter of 80 mm had the lowest consumption of electrical energy per order (EEO) for MB degradation (17.24 kWh•m-3•order-1). Finally, the contributions of anode catalytic oxidation and direct photolysis to the MB degradation rate in PEC reactors with various inner diameters were quantitatively analyzed, which provides important reference for the optimal design of a PEC reactor.

KW - Internal structure

KW - Photoelectrocatalytic reactor

KW - Pollutant degradation rate

KW - UV fluence rate

U2 - 10.13671/j.hjkxxb.2019.0320

DO - 10.13671/j.hjkxxb.2019.0320

M3 - Tidsskriftartikel

AN - SCOPUS:85075495172

VL - 39

SP - 3832

EP - 3838

JO - Huanjing Kexue Xuebao / Acta Scientiae Circumstantiae

JF - Huanjing Kexue Xuebao / Acta Scientiae Circumstantiae

SN - 0253-2468

IS - 11

ER -