Download development of modified titania nano photocatalysts to synergise visible light utilisation for ... PDF

Titledevelopment of modified titania nano photocatalysts to synergise visible light utilisation for ...
File Size14.5 MB
Total Pages213
Document Text Contents
Page 2



Name of Candidate:���/�(�2�1�*���.�$�+���+�2�1���������������� ��������������������������������(I.C/Passport No:�������������� ������������������ )

Registration/Matric No:���.�+�$��������������

Name of Degree:

Title of Project Paper/Research Report/Dissertation/Thesis (“this Work”): �'�(�9�(�/�2�3�0�(�1�7���2�)��



Field of Study:

I do solemnly and sincerely declare that:

(1) I am the sole author/writer of this Work;
(2) This Work is original;
(3) Any use of any work in which copyright exists was done by way of fair dealing and for

permitted purposes and any excerpt or extract from, or reference to or reproduction of
any copyright work has been disclosed expressly and sufficiently and the title of the
Work and its authorship have been acknowledged in this Work;

(4) I do not have any actual knowledge nor do I ought reasonably to know that the making
of this work constitutes an infringement of any copyright work;

(5) I hereby assign all and every rights in the copyright to this Work to the University of
Malaya (“UM”), who henceforth shall be owner of the copyright in this Work and that any
reproduction or use in any form or by any means whatsoever is prohibited without the
written consent of UM having been first had and obtained;

(6) I am fully aware that if in the course of making this Work I have infringed any copyright
whether intentionally or otherwise, I may be subject to legal action or any other action
as may be determined by UM.

Candidate’s Signature Date

Subscribed and solemnly declared before,

Witness’s Signature Date


Page 106


Figure 4.14: FESEM images of the (a) low magnification, (b-c) high magnification

of 0.5wt% Pd/TiO2. The inset of (c) is the EDX of 0.5wt% Pd/TiO2 and (d-f)

HRTEM images of 0.5wt% Pd/TiO2

Page 107


Figure 4.15 shows the X-ray diffraction patterns of anatase TiO2 and Pd/TiO2 with

different Pd loading (0.5wt%, 1.0wt% and 3.0wt %). Pure anatase TiO2 is observed in all

samples indicating that its crystallinity and the phase is not distorted by the solar assisted

photodeposition. The diffraction patterns of the prepared anatase TiO2 well correlated

with the standard peaks (JCPDS no. 21-1272). The presence of Pd NPs are signified by a

e assigned to (1 1 1) and (2 0

0) crystal plane of face centered cubic (FCC) Pd (JCPDS no 46-1043) respectively. From

the diffraction patterns only two peaks instead of three that designates Pd was observed.

This was due to the peak overlap with the anatase TiO2

to be two peaks. Thus these three diffraction peaks further signifies the metallic state of

the loaded Pd NPs. The peaks also confirm the stability of the synthesized palladium

crystals that has a notable contribution to promising visible light performance (Chan,

Chang, Hsu, Wang, & Lin, 2009). Overall, the prepared samples showed higher

crystallinity that is ascertained by the sharp peaks. The average crystalline sizes of anatase

TiO2 and Pd particles were calculated using well know Scherrer equation. The crystalline

size of the Pd particles was found to be 21.22 nm, 22.41 nm and 28.10 nm for 0.5wt%

Pd/TiO2, 1.0wt% Pd/TiO2 and 3.0wt% Pd/TiO2 respectively. No significant changes in

crystalline size of anatase TiO2 (19.75 nm) was observed after depositing Pd (19.57 nm).

This very well clarified that Pd was deposited onto the TiO2 surface and not incorporated

into the TiO2 lattice.

Page 212



Papers Published

1. Leong, K. H., Liu, S. L., Sim, L.C., Saravanan, P., Jang, M., & Ibrahim, S. (2015).

Surface reconstruction of titania with g-C3N4 and Ag for promoting efficient electrons

migration and enhanced visible light photocatalysis. – DOI:


2. Leong, K. H., Sim, L. C., Bahnemann, D., Jang, M., Ibrahim, S., & Saravanan, P.

(2015). Reduced graphene oxide and Ag wrapped TiO2 photocatalyst for enhanced

visible light photocatalysis. 3, 104503.

3. Leong, K. H., Chu, H. Y., Ibrahim, S., & Saravanan, P. (2015). Palladium nanoparticles

anchored to anatase TiO2 for enhanced surface plasmon resonance-stimulated, visible-

light-driven photocatalytic activity. , 6, 428-437.

4. Leong, K. H., Gan, B. L., Ibrahim, S., & Saravanan, P. (2014). Synthesis of surface

plasmon resonance (SPR) triggered Ag/TiO2 photocatalyst for degradation of

endocrine disturbing compounds. , 128-135.

5. Leong, K. H., Monash, P., Ibrahim, S., & Saravanan, P. (2014). Solar photocatalytic

activity of anatase TiO2 nanocrystals synthesized by non-hydrolitic sol-gel method.

, 321-332.

Page 213


Conference Presentations





Similer Documents