Heterogeneous catalytic oxidation of methylene blue by amine-functionalized titanium-terephthalate metal organic framework, NH2-MIL-125 (Ti)

Iron oxide sludge formation, high pH dependency, and poor catalyst reusability have always been critical drawbacks of Fenton’s reagent. In this work, titaniumterephthalate metal organic framework, NH2-MIL-125(Ti), was proposed as heterogeneous Fenton-like catalyst for methylene blue degradation. NH2...

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Main Author:	Teo, Szea Err
Format:	Thesis
Language:	English English
Published:	2017
Subjects:	QD450-801 Physical and theoretical chemistry
Online Access:	https://eprints.ums.edu.my/id/eprint/38969/1/24%20PAGES.pdf https://eprints.ums.edu.my/id/eprint/38969/2/FULLTEXT.pdf
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spelling	my-ums-ep.389692024-06-28T06:29:03Z Heterogeneous catalytic oxidation of methylene blue by amine-functionalized titanium-terephthalate metal organic framework, NH2-MIL-125 (Ti) 2017 Teo, Szea Err QD450-801 Physical and theoretical chemistry Iron oxide sludge formation, high pH dependency, and poor catalyst reusability have always been critical drawbacks of Fenton’s reagent. In this work, titaniumterephthalate metal organic framework, NH2-MIL-125(Ti), was proposed as heterogeneous Fenton-like catalyst for methylene blue degradation. NH2-MIL- 125(Ti) is a metal-organic compound possessing high surface area, photocatalytic properties and unique dual-porosity. MIL-125(Ti) and NH2-MIL-125(Ti) was prepared through reflux method and activated using conventional solvent exchange method. Both samples were confirmed by XRD and FTIR. SEM images showed that NH2-MIL-125(Ti) has spherical morphology with size ranging from 250 to 500 nm which is at least half of the size of MIL-125(Ti). NH2-MIL-125(Ti) is stable under water with superior adsorption and photocatalytic activities upon visible and UV-A irradiation. Furthermore, the results revealed that NH2-MIL-125(Ti) is an effective non-ferrous Fenton-like catalyst. Synergistic effect was observed between NH2-MIL- 125(Ti) and H2O2, with 84 % of removal efficiency in 40 ppm of methylene blue. Results showed that •OH and h+ are the dominant species in Fenton-like oxidation of NH2-MIL-125(Ti)/H2O2 catalytic system. Photoenhancement was proven to be effective where up to 92 % removal was obtained when exposed to UV-A light. NH2-MIL-125(Ti) showed low pH dependency with stable degradation from pH 3 to 9. Negligible amount of titanium leaching was detected which indicates the high stability of heterogeneous NH2-MIL-125(Ti) catalyst with reusability up to three runs. The heterogeneous titanium-terephthalate metal organic framework catalyst can overcome the disadvantages of traditional homogeneous Fenton catalyst. The results indicate that NH2-MIL-125(Ti) can be a new material for Fenton-like oxidation processes. 2017 Thesis https://eprints.ums.edu.my/id/eprint/38969/ https://eprints.ums.edu.my/id/eprint/38969/1/24%20PAGES.pdf text en public https://eprints.ums.edu.my/id/eprint/38969/2/FULLTEXT.pdf text en validuser masters Universiti Malaysia Sabah Fakulti Sains dan Sumber Alam
institution	Universiti Malaysia Sabah
collection	UMS Institutional Repository
language	English English
topic	QD450-801 Physical and theoretical chemistry
spellingShingle	QD450-801 Physical and theoretical chemistry Teo, Szea Err Heterogeneous catalytic oxidation of methylene blue by amine-functionalized titanium-terephthalate metal organic framework, NH2-MIL-125 (Ti)
description	Iron oxide sludge formation, high pH dependency, and poor catalyst reusability have always been critical drawbacks of Fenton’s reagent. In this work, titaniumterephthalate metal organic framework, NH2-MIL-125(Ti), was proposed as heterogeneous Fenton-like catalyst for methylene blue degradation. NH2-MIL- 125(Ti) is a metal-organic compound possessing high surface area, photocatalytic properties and unique dual-porosity. MIL-125(Ti) and NH2-MIL-125(Ti) was prepared through reflux method and activated using conventional solvent exchange method. Both samples were confirmed by XRD and FTIR. SEM images showed that NH2-MIL-125(Ti) has spherical morphology with size ranging from 250 to 500 nm which is at least half of the size of MIL-125(Ti). NH2-MIL-125(Ti) is stable under water with superior adsorption and photocatalytic activities upon visible and UV-A irradiation. Furthermore, the results revealed that NH2-MIL-125(Ti) is an effective non-ferrous Fenton-like catalyst. Synergistic effect was observed between NH2-MIL- 125(Ti) and H2O2, with 84 % of removal efficiency in 40 ppm of methylene blue. Results showed that •OH and h+ are the dominant species in Fenton-like oxidation of NH2-MIL-125(Ti)/H2O2 catalytic system. Photoenhancement was proven to be effective where up to 92 % removal was obtained when exposed to UV-A light. NH2-MIL-125(Ti) showed low pH dependency with stable degradation from pH 3 to 9. Negligible amount of titanium leaching was detected which indicates the high stability of heterogeneous NH2-MIL-125(Ti) catalyst with reusability up to three runs. The heterogeneous titanium-terephthalate metal organic framework catalyst can overcome the disadvantages of traditional homogeneous Fenton catalyst. The results indicate that NH2-MIL-125(Ti) can be a new material for Fenton-like oxidation processes.
format	Thesis
qualification_level	Master's degree
author	Teo, Szea Err
author_facet	Teo, Szea Err
author_sort	Teo, Szea Err
title	Heterogeneous catalytic oxidation of methylene blue by amine-functionalized titanium-terephthalate metal organic framework, NH2-MIL-125 (Ti)
title_short	Heterogeneous catalytic oxidation of methylene blue by amine-functionalized titanium-terephthalate metal organic framework, NH2-MIL-125 (Ti)
title_full	Heterogeneous catalytic oxidation of methylene blue by amine-functionalized titanium-terephthalate metal organic framework, NH2-MIL-125 (Ti)
title_fullStr	Heterogeneous catalytic oxidation of methylene blue by amine-functionalized titanium-terephthalate metal organic framework, NH2-MIL-125 (Ti)
title_full_unstemmed	Heterogeneous catalytic oxidation of methylene blue by amine-functionalized titanium-terephthalate metal organic framework, NH2-MIL-125 (Ti)
title_sort	heterogeneous catalytic oxidation of methylene blue by amine-functionalized titanium-terephthalate metal organic framework, nh2-mil-125 (ti)
granting_institution	Universiti Malaysia Sabah
granting_department	Fakulti Sains dan Sumber Alam
publishDate	2017
url	https://eprints.ums.edu.my/id/eprint/38969/1/24%20PAGES.pdf https://eprints.ums.edu.my/id/eprint/38969/2/FULLTEXT.pdf
_version_	1804890357270315008

Heterogeneous catalytic oxidation of methylene blue by amine-functionalized titanium-terephthalate metal organic framework, NH2-MIL-125 (Ti)

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