Using Titanium Dioxide as Photocatalyst to Reduce Pollution

572 WordsFeb 26, 20182 Pages
Recent research shows that titanium dioxide can be used as a photocatalystic property to reduce pollutants. This was first discovered by Fujishima and Honda in 1972, where the photocatalystic properties of titanium dioxide were found to be applicable. It was shown that by converting ultraviolet light energy, this compound acts as a catalyst to produce hydroxyl in the presence of moisture in the air. Hydroxl then can oxidize and convert these harmful pollutants to HNO3. The reason that this is useful is because nitrogen oxide is a common pollutant which has many adverse effects to society. Nitrogen oxides may form into nitric acid which contributes to acid rain, and it also chemically reacts to sunlight and changes into ozone which additionally has many adverse health effects for living organisms and non-living things alike. The health related issues are a major reason to reduce emissions of NOx because although health is important, money is an issue as well. In California an independent study conducted from 2005 to 2007 found that nearly 30,000 visits in the state were due to California failing to meet both federal and state standards for PM and ozone. This data comes from statistics of hospital reports for respiratory, cardiovascular, and asthma attacks. Even though the study estimates were on the conservative side, it was estimated that the cost of un-attainment to the state between that 3 year periods was 193 million dollars. And because the majority of residence

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