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引用次数: 2
摘要
使用纳米结构半导体的多相光催化构成了新兴的高级氧化过程(AOP)之一，用于水或空气中有机污染物的破坏性氧化。本文报道了用悬浮半导体光催化剂TiO2光催化降解邻硝基苯酚(ONP)、间硝基苯酚(MNP)和对硝基苯酚(PNP)的动力学，使用实验室规模的浸没井和紫外(UV)光反应器，并比较了(i) UV + TiO2 (ii) UV + TiO2 + H2O2等不同高级氧化过程。此外，还考察了TiO2浓度、底物溶液初始浓度、辐照时间等其他参数的影响，以获得完全降解污染物的最佳工艺参数。在没有光催化剂TiO2的情况下，紫外光的影响可以忽略不计，而三种NPs的降解率都非常高。
Environmental Applications of Nanocrystalline TiO2 in Combination with H2O2
ABSTRACT Heterogeneous photocatalysis using nanostructured semiconductors constitutes one of the emerging advanced oxidation processes (AOP) for destructive oxidation of organic contaminants in water or air. Herein we report the kinetics of potocatalytic degradation of nitrophenols (NPs), namely, o-nitrophenol (ONP), m-nitrophenol (MNP), and p-nitrophenol (PNP), using semiconductor photocatalyst TiO2 in suspension, using laboratory-scale immersion well an ultraviolet (UV) photoreactor and the comparison of different advanced oxidation processes such as (i) UV + TiO2 (ii) UV + TiO2 + H2O2. In addition, the effect of several other parameters such as TiO2 concentration, initial concentration of substrate solution, and effect of time of irradiation was investigated to arrive at optimum process parameters for complete degradation of the pollutants. UV light was found to have a negligible effect in the absence of the photocatalyst, TiO2, whereas the percentage degradation of all three NPs was found to be drasti...
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