Research Laboratory of Environment Protection Technology, Department of Applied Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz, Iran.
Environ Sci Pollut Res Int. 2014;21(14):8555-64. doi: 10.1007/s11356-014-2777-z. Epub 2014 Apr 15.
In the present study, an activated charcoal (AC) plate was prepared by physical activation method. Its surface was coated with TiO₂ nanoparticles by electrophoretic deposition (EPD) method. The average crystallite size of TiO₂ nanoparticles was determined approximately 28 nm. The nature of prepared electrode was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and Brunauer-Emmett-Teller (BET) surface area measurement before and after immobilization. The electrosorption and photocatalytic one-stage combined process was investigated in degradation of Lanasol Red 5B (LR5B), and the effect of dye concentration, electrolyte concentration, pH, voltage, and contact time was optimized and modeled using response surface methodology (RSM) approach. The dye concentration of 30 mg L(-1), Na₂SO₄ concentration of 4.38 g L(-1), pH of 4, voltage of 250 mV, and contact time of 120 min were determined as optimum conditions. Decolorization efficiency increased in combined process to 85.65% at optimum conditions compared to 66.03% in TiO₂/AC photocatalytic, 20.09% in TiO₂/AC electrosorption, and 1.91% in AC photocatalytic processes.
在本研究中，通过物理活化法制备了活性炭 (AC) 板。通过电泳沉积 (EPD) 法将 TiO₂ 纳米粒子涂覆在其表面。TiO₂ 纳米粒子的平均晶粒尺寸约为 28nm。通过 X 射线衍射 (XRD)、扫描电子显微镜 (SEM) 和 Brunauer-Emmett-Teller (BET) 表面积测量，在固定化前后对制备的电极的性质进行了表征。在 Lanasol Red 5B (LR5B) 的降解中研究了电吸附和光催化一阶段联合工艺，并用响应面法 (RSM) 对染料浓度、电解质浓度、pH 值、电压和接触时间的影响进行了优化和建模。确定最佳条件为染料浓度 30mg/L(-1)、Na₂SO₄浓度 4.38g/L(-1)、pH 值 4、电压 250mV 和接触时间 120min。与 TiO₂/AC 光催化、TiO₂/AC 电吸附和 AC 光催化过程中的 66.03%、20.09%和 1.91%相比，在最佳条件下，联合工艺的脱色效率提高到 85.65%。
