Parametric study on the photocatalytic degradation of Bacillus subtilis in water using titanium dioxide as photocatalyst

Date

5-2013

Degree

Bachelor of Science in Chemical Engineering

College

College of Engineering and Agro-Industrial Technology (CEAT)

Adviser/Committee Chair

Ramer P. Bautista

Restrictions

Restricted: Not available to the general public. Access is available only after consultation with author/thesis adviser and only to those bound by the confidentiality agreement.

Abstract

Light is used to excite the semiconductor electrons to achieve an objective reaction called photocatalysis. Titanium dioxide is one of the important photocatalyst that can be used for numerous applications, for which microbial decontamination is one of its main functions. Bacillus subtilis is a food, water and air borne microorganism and is highly resistant to extreme conditions due to its adaptation and endospore production. If Bacillus subtilis contaminated water can be effectively removed through photocatalytic oxidation, the procedure might well be applicable to a wide range of microorganisms of lesser resistance. Culture and catalyst loading were studied for photocatalysis of Bacillus subtilis under normal sunlight and UV radiation. Results indicated that an inverse relationship of culture loading vs decontamination while the opposite was found for catalyst loading. Sunlight was found to be effective than UV. Furthermore, culture loading, catalyst loading and light source as well as the interaction terms were highly significant factors or parameters in the decontamination process of photocatalytic oxidation. Generally, photocatalytic oxidation using titanium dioxide as a catalyst can be used to decontaminate or inhibit Bacillus subtilis in water, with several modifications of the experiment to produce an accurate and controlled result.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 993.5 2013 E62 A56

Document Type

Thesis

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