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Significant effect of ph on photocatalytic degradation of organic pollutants using semiconductor catalysts

机译：ph对使用半导体催化剂光催化降解有机污染物的显著作用

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Photocatalytic is one of the inexpensive and non-toxic techniques for degradation of organic pollutants into harmless substances such as water and carbon dioxide. In this study, simple electrolysis method was used in preparation of Ag/TiO2 and α-Fe2O3/HY catalysts. The physicochemical properties of the catalysts were studied using XRD, FTIR, FESEM-EDX and surface area analysis. The pH of solution plays an important role in the photocatalytic degradation of organic pollutants which influences the surface-charge properties of the catalysts. Ag/TiO2 and α-Fe2O3/HY were used as catalyst on degradation of 2-chlorophenol (2-CP) and methyl orange (MO), respectively. The effect of pH on degradation of 2-CP and MO were investigated over a pH range from 2 to 9. Higher degradation of 2-CP and MO were obtained at pH 5 (74%) and pH 2 (80%), respectively. This finding might be explained by the amphoteric performance of the catalyst using point zero charge (pHZPC). The pHZPC for Ag/TiO2 and α-Fe2O3/HY was found to be at pH 6.3 and pH 7.2, respectively. Hence, the activities of the catalysts may have been affected by the existence of a strong electrostatic field between the positively charged catalysts surface and negatively charged 2-CP and MO caused a pH value lower than their pHZPC give greater degradation.
机译：光催化是将有机污染物降解为无害物质（例如水和二氧化碳）的廉价且无毒的技术之一。在这项研究中，简单的电解方法用于制备Ag / TiO2和α-Fe2O3/ HY催化剂。用XRD，FTIR，FESEM-EDX和表面积分析法研究了催化剂的理化性质。溶液的pH值在有机污染物的光催化降解中起着重要作用，这会影响催化剂的表面电荷性能。 Ag / TiO2和α-Fe2O3/ HY分别用作降解2-氯苯酚（2-CP）和甲基橙（MO）的催化剂。在2到9的pH范围内，研究了pH对2-CP和MO降解的影响。分别在pH 5（74％）和pH 2（80％）下获得了2-CP和MO的更高降解。该发现可以通过使用零电荷点（pHZPC）的催化剂的两性性能来解释。发现用于Ag / TiO 2和α-Fe2 O 3 / HY的pHZPC分别为pH 6.3和pH 7.2。因此，在带正电的催化剂表面与带负电的2-CP和MO之间存在强静电场，可能会影响催化剂的活性，从而导致pH值低于其pHZPC的降解程度。

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