A Review on the Factors Affecting the Photocatalytic Degradation of Hazardous Materials

The oxidation rates and efficiency of the photocatalytic system are highly dependent on a number of operational parameters that govern the photodegradation of the organic molecule Several study have been reported the significance of operational parameter The photodegradation depends on the some basic parameters which are concentration of substrate amount of photocatalyst pH of the solution temperature of reaction medium time of irradiation of light the intensity of light surface area of photocatalyst dissolve oxygen in the reaction medium nature of the photocatalyst nature of the substrate doping of metal ions and non metal and structure of photocatalyst and substrate The photodegradation of organic compound have been studied by the several scientists and conclude the optimum conditions for the photodegradation of organic compound The photodegradation of organic compounds was found maximum at low concentration of organic substrate with optimum amount of photocatalyst The pH of the solution is also affect the photodegradation of organic substrate The Titania show the maximum adsorption at low pH hence the photodegradation also found maximum at low pH The surface area is the crucial factor for the photodegradation of organic substrate If we are increasing the surface area of photocatalyst the photodegradation of organic substrate increase This is because that the number of active site increased with increasing the surface area The amount of photocatalyst is the primary requirement of any photocatalysis process The amount of photocatalyst should be optimum if we take the high amount of photocatalyst the photodegradation is decreased if we take the low amount of photocatalyst the photodegradation also decreased The doping of metal ions and non metal ions affect the photodegradation of organic substrate Therefore we have to use the metal ions which increased the positive charge on the surface of photocatalyst The temperature and irradiation of light also affect the photodegradation of organic substrate For the maximum photodegradation the photocatalytic reaction should perform at room temperature not greater than deg C The light of irradiation should be used which exit the electron easily from valence band to conduction band or equal to band gap energy