Please use this identifier to cite or link to this item: https://scholarbank.nus.edu.sg/handle/10635/222213
Title: EXPERIMENTAL STUDY ON PHOTOCATALYTIC EFFECTS OF TIO2 AND ZNO NANOSTRUCTURES FOR THE DEGRADATION OF ORGANIC COMPOUNDS
Authors: PRISCILIA D/O THOMAS LALCHANG
Keywords: UV irradiation
Nanoparticles
Photodegradation
Photocatalytic Activity
MB
Cement
VOCs
ZnO
Shah Kwok Wei
Building
PFM
Project and Facilities Management
2019/2020 PFM
TiO2
Issue Date: 5-Jun-2020
Citation: PRISCILIA D/O THOMAS LALCHANG (2020-06-05). EXPERIMENTAL STUDY ON PHOTOCATALYTIC EFFECTS OF TIO2 AND ZNO NANOSTRUCTURES FOR THE DEGRADATION OF ORGANIC COMPOUNDS. ScholarBank@NUS Repository.
Abstract: The use of nanoparticles such as Titanium Dioxide (TiO2) and Zinc Oxide (ZnO) have become prevalent in the test for its photocatalytic activity in photodegradation of organic pollutants under the irradiation of ultraviolet (UV) light. This dissertation is to investigate the effectiveness of the nanoparticles and to determine the shortest time with the smallest concentration needed to apply on both glass and cement to achieve the photodegradation of the organic pollutant. The study will be done by conducting four different experiments under the irradiation of UV. Two experiments will be done with glass slides and bottles while the other two will be done by nanocoating cement and testing the effectiveness of the photodegradation of both TiO2 and ZnO. In the study where the glass tiles were nanocoated, 230µL of TiO2 was used and it was able to degrade the organic pollutant in 6 minutes 45 seconds while 280µL of ZnO was used to degrade the organic pollutant in 6 minutes 15 seconds. Though ZnO was able to photodegrade 7.41% faster, TiO2 can be deduced to be a better photocatalyst as the amount required for the reaction to occur was 17.86% lesser and the powder content of TiO2 required was 50% lesser than ZnO. The determined powder content of TiO2 and ZnO to water for the glass slide test was 0.5mg of TiO2 for every mL of Water and 1mg of ZnO for every mL of water. In the study where the cement samples were placed in a tank to measure the Volatile Organic Compounds (VOCs) readings, it was deduced that ZnO was a better photocatalyst as compared to TiO2 as it was able to degrade the organic pollutant as the increase was at a slower rate. The determined powder content of TiO2 and ZnO to ethanol ratio for the cement was 1mg for every 6mL of ethanol. However, not all experiments were able to produce positive results as the experiments with cement were not successful due to the porosity of the cement and the abundance of air pockets in the airtight tank. The limitations of these experiments would be brought forward and recommendations for future studies regarding this topic would be given.
URI: https://scholarbank.nus.edu.sg/handle/10635/222213
Appears in Collections:Bachelor's Theses

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