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TitleConstruction of Metal-organic Frameworks Based Materials for Visible Light Photocatalysis
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Title Construction of Metal-organic Frameworks Based Materials for Visible Light Photocatalysis

Author(s) 史, 力

Citation 北海道大学. 博士(理学) 甲第12916号

Issue Date 2017-09-25

DOI 10.14943/doctoral.k12916

Doc URL http://hdl.handle.net/2115/67436

Type theses (doctoral)

File Information Li_Shi.pdf

Hokkaido University Collection of Scholarly and Academic Papers : HUSCAP

Page 2

Construction of Metal-organic Frameworks

Based Materials for Visible Light Photocatalysis















Li Shi

Functional Materials Chemistry Unit

Graduate School of Chemical Sciences and Engineering

Hokkaido University

2017

Page 79

Chapter 3


74


between CNNS and UiO-66 is formed through electrostatic self-assembly process. The crystallographic

structure of the products was determined by XRD patterns. As shown in Figure 3.2d, the peaks

characteristic for UiO-66 can be clearly identified in UiO-66/CNNS composite, suggesting that the crystal

phase structure of UiO-66 is retained after being coated by CNNS.
15-18

The enlarged XRD pattern in

Figure 3.2d confirms that the sample is a hybrid structure between UiO-66 and CNNS. The optical

absorption of UiO-66 MOF and UiO-66/CNNS hybrid structure was measured by UV-visible absorption

spectra. As illustrated in Figure 3.2e, UiO-66 can only absorb UV-light in the wavelength shorter than

350nm, while UiO-66/CNNS hybrid structure has an absorption edge at about 440nm, which is similar to

CNNS. The enhancement of light absorption in the visible region further confirms the formation of hybrid

structure between UiO-66 and CNNS. Figure 3.2f shows the N2 adsorption-desorption isotherms for the

UiO-66 MOF and UiO-66/CNNS hybrid structure, respectively. The sample of bare UiO-66 MOF attains

a Langmuir surface area of 1610.5 m
2
g

-1
, while the UiO-66/CNNS hybrid structure shows relatively low

surface area (1315.3 m
2
g

-1
). The decrease in surface area after CNNS coating is reasonable, as the CNNS

accounts for 10% of the total weight and exhibits much smaller surface area (Figure 3.5). The dispersed

bulk CN in water was also negatively charged, with a measured zeta potential of -24.27 mV, thus UiO-

66/bulk CN composite can also be formed through electrostatic self-assembly process. The XRD patterns

and UV-visible absorption spectra demonstrate that the hybrid composite consisted of bulk CN and UiO-

66 was formed successfully (Figure 3.6). Further information about the microstructure of UiO-66/bulk

CN composite was obtained from TEM images. As shown in Figure 3.7, UiO-66 crystals are coated by

bulk CN, thereby forming a nano-junction of UiO-66/bulk CN composite. The Langmuir surface area of

UiO-66/bulk CN composite is 1340.9 m
2
g

-1
, which is close to that of UiO-66/CNNS composite.

Page 80

Chapter 3


75




Figure 3.4. TEM image and corresponding elemental mapping images of UiO-66/CNNS. The CNNS

content in UiO-66/CNNS composite is 10 wt%.







Figure 3.5. N2 adsorption-desorption isotherms of CNNS and bulk CN.

Page 157

Chapter 6


152


between metal cluster and organic linker is of great necessity, as the stability of MOFs materials is

heavily dependent on the coordination between ligands and metal centers.

Page 158

Acknowledgement


153


Acknowledgement

First of all, I would like to extend my sincere gratitude to my supervisor, Prof. Jinhua Ye, for her

helpful guidance, valuable suggestions and constant encouragement both in my study and in my life. She

has given me patient instructions and profound insight throughout the process of selecting the research

topic, discussing the experimental results and writing the thesis during my PhD course. Her inspirational

and conscientious teachings will always be of great value to my future academic research. I am deeply

grateful of her help in my research and the completion of this thesis.

Secondly, I want to express my heartfelt thanks to my supervisors, Prof. Kiyoharu Tadanaga and Prof.

Kazunari Yamaura. Their insightful comments on my thesis, which provides me with many enlightening

ideas, have inspired me to a great extent.

I would like to express my sincere gratitude to Dr. Tetsuya Kako, Dr. Naoto Umezawa and Dr.

Hideki abe, for their insightful comments and suggestions about my research. I also owe many thanks to

Haruna-san, Aya-san and Atsuko-san for their generous help about my daily life and research in Japan.

Also, I want to thank all the group members in our lab. I would like to express my thanks to Dr.

Wang Tao, Dr. Li Peng, Dr. Chang Kun, Dr. Liu Huimin, Dr. Liu Lequan, Dr. Kang Qing, Dr. Zhang

Huabin, Dr. Zhao Guixia, Dr. Meng Xianguang, Mr. Liu Guigao, Ms. Yu Qing, Mr. Li Mu, Mr. Hai Xiao,

Mr. Lu Hao, Ms. Pang Hong, Ms. Yang Liuqing, Ms. Wang Hongmei and Mr. Ichihara Fumihiko.

Without their kind help, I would not undertake the research smoothly or enjoy a happy life in NIMS.

Finally, I would like to extend my deep gratefulness to my parents and friends who support me

without a word of complaint and shared with me my worries, frustrations, and happiness.

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