Photocatalytic oxidation of Reactive Black 5 with UV-A LEDs

被引:40
作者
Ferreira, Leonor C. [1 ]
Lucasa, Marco S. [1 ,2 ]
Fernandes, Jose R. [3 ,4 ]
Tavares, Pedro B. [1 ]
机构
[1] UTAD Univ Tras Os Montes & Alto Douro, Dept Quim, Ctr Quim Vila Real, P-5000801 Quinta De Prados, Vila Real, Portugal
[2] Univ Loughborough, Dept Chem Engn, Environm Nanocatalysis & Photoreact Engn, Loughborough LE11 3TU, Leics, England
[3] UTAD Univ Tras Os Montes & Alto Douro, Dept Fis, P-5000801 Quinta De Prados, Vila Real, Portugal
[4] INESC TEC, Rua Campo Alegre 687, P-4169007 Oporto, Portugal
关键词
Heterogeneous photocatalysis; Titanium dioxide; Light emitting diodes; Reactive Black 5; UV-A;
D O I
10.1016/j.jece.2015.10.042
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The effectiveness of UV-A Light emitting diodes (UV-A LEDs) for decolourization of Reactive Black 5 (RB5) solutions in a continuous photoreactor and the effect of different operational parameters on the photocatalytic decolourization of RB5 were investigated in the present work. The operational parameters included catalyst load, initial dye concentration, irradiance and solution flowrate. Photocatalytic experiments were conducted in a self-designed photoreactor with a matrix of 96 UV-A LEDs (375 nm) and Evonik P-25 TiO2 was used as a photocatalyst. The optimum experimental conditions that allowed the highest decolourization of RB5 (89%) were an irradiance of 40 W/m(2), 1.0 g/L of TiO2, 50 mg/L of RB5 and a flowrate of 0.8 mL/min. A continuous stirred tank reactor (CSTR) design equation, subsequently simplified to a pseudo-first order rate equation, was used to analyse the kinetics of the experimental results. From the kinetics it is possible to observe that high TiO2 concentrations (1.0 g/L) and light irradiances (40 W/m(2)) positively affect the reaction rate (r, 2.483 x 10 (7) mol/L min) and the reaction rate constants (k, 7.351 x 10 (3) min (1)). The figure-of-merit electrical energy per order (E-EO) was calculated for the photoreactor, and values of 220 kWh/m(3)/order were reached for an electric power consumption of 0.0129 kW and a solution flowrate of 4.8 x 10 (6)m(3)/h. Results demonstrated that a UV-A LED/TiO2 process can effectively decolourize RB5 dye solutions within the selected optimum conditions. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码:109 / 114
页数:6
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