Huan DoanUniversity of Bristol | UB · School of Chemistry
Huan Doan
Doctor of Philosophy
About
41
Publications
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Introduction
Huan Doan currently works at the School of Chemistry, University of Bristol. His project is about synthesis, characterisation of novel hierarchical porous materials to address challenges in sustainability (catalysis and energy storage).
Additional affiliations
August 2020 - present
July 2019 - August 2020
October 2018 - December 2018
Education
September 2015 - June 2019
September 2014 - September 2015
Publications
Publications (41)
Nanostructured high-temperature superconductors YBa 2 Cu 3 O 6+δ and Bi 2 Sr 2 CaCu 2 O 8+δ were synthesised using a melamine formaldehyde sponge as a sacrificial template, via three solution-based approaches. In the case of YBa 2 Cu 3 O 6+δ , a modified Pechini method...
Integration between conventional semiconductors and porous materials can enhance electron-hole separation, improving photocatalytic activity. Here, we introduce a heterostructure that was successfully constructed between vanadium pentoxide (V 2 O 5) and mesoporous SBA-15 using inexpensive halloysite clay as the silica-aluminium source. The composit...
General Discussion on Emerging technologies at the Faraday Discussion on Carbon dioxide utilisation
Introducing heterostructures to graphitic carbon nitrides (g-C3N4) can improve the activity of visible-light-driven catalysts for the efficient treatment of multiple toxic pollutants in water. Here, we report for the first time that a complex material can be constructed from oxygen-doped g-C3N4 and a MIL-53(Fe) metal-organic framework using facile...
p>Introducing heterostructure to graphitic carbon nitrides (g-C<sub>3</sub>N<sub>4</sub>) can improve the activity of visible-light-driven catalysts for efficient treatment of multiple toxic pollutants in water. Here we report for the first time that a complex material can be constructed from an oxygen-doped g-C<sub>3</sub>N<sub>4</sub> and MIL-53(...
Introducing additional meso- or macroporosity into traditionally microporous metal-organic frameworks (MOFs) is a very promising way to improve the catalytic performance of these materials, mostly due to the resultant reductions of diffusional barriers during reactions. Here we show that HKUST-1 can be successfully synthesised via in situ crystalli...
Chabazite (CHA), one of the most common zeolite framework types, has a remarkable capacity to accommodate a wide range of different cations within the unique CHA framework. This has led to CHA being applied extensively in ion exchange, and studied for highly selective gas sorption, most notably through a trapdoor mechanism. Here, we report the syst...
Here we report a new ceasium Brønsted ion-exchanged Al-SBA-15 (Cs/AS15) supported heteropoly acid (HPA) H3PW12O40 (HPA-Cs/AS15) material which can be prepared and used as heterogeneous catalyst for the fructone fragrancy synthesis. It was demonstrated that Cs⁺ was more effective than NH4⁺ as counter cation of ion-exchanged AS15 support for preparin...
A novel oxygen-doped graphitic carbon nitride and zeolite (H-ZSM-5) composite (O-g-C3N4/H-ZSM-5) was synthesized using hydrogen peroxide and urea as the oxygen and g-C3N4 precursors, respectively, and per-lite as the zeolite source, via calcination at 550°C. BET N2 adsorption-desorption analysis verified that the 40%O-g-C3N4/H-ZSM-5 composite had a...
![Fig. 1 Framework structures of (a) [Zn 4 O(bdc) 3 ] (IRMOF-1), 19 (b)...](profile/Arun-Srikanth-Sridhar/publication/343101514/figure/fig2/AS:916765303402496@1595585289242/Framework-structures-of-a-Zn-4-Obdc-3-IRMOF-1-19-b-Zr-6-O-4-OH-4-bdc-6_Q320.jpg)
Zinc( ii ) and zirconium( iv ) MOFs show uptake and slow release of the ant alarm pheromones 3-octanone and 4-methyl-3-heptanone.
Here we show that bimetallic Ti-Al-SBA-15 materials were synthesized successfully from titanium tetraisopropoxide (TTIP) and natural halloysite clay via the direct hydrothermal method. The results revealed that the incorporation of titanium species in the Al-SBA-15 framework retained the characteristic peaks and possessed an increased Brunauer-Emme...
In recent decades, highly efficient deep desulfurization processes have become very necessary to decrease environmental pollution due to sulfur emissions from fuels. Herein, an enhanced photocatalytic desulfurization of a model fuel was investigated under sunlight irradiation using H2O2 as the oxidant and [email protected] loaded mesoporous silica...
In recent years, polysulfone-based nanocomposite membranes have been widely used for contaminated water treatment because they comprise properties such as high thermal stability and chemical resistance. In this study, a polysulfone (PSf) nanocomposite membrane was fabricated using the wet-phase inversion method with the fusion of graphene oxide (GO...
This article introduces research on the synthesis and characteristics of C–TiO2 doped cellulose acetate (CA) nanocomposite film. TiO2 nanoparticles were synthesized from Ilmenite mineral in Binh Dinh, Vietnam, and modified by Stevia Rebaudiana plant in order to serve as a cheap, stable, and eco-friendly photocatalyst that could perform under visibl...
![Figure 4. (a) PXRD results of simulated [Cu24(OH-mBDC)24]n, normal...](publication/338288785/figure/fig3/AS:842352306434048@1577843848134/a-PXRD-results-of-simulated-Cu24OH-mBDC24n-normal-Cu24OH-mBDC24n-and_Q320.jpg)
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In this report, we explore the use of supercritical CO2 (scCO2) in the synthesis of well-known metal-organic frameworks (MOFs) including Zn-MOF-74 and UiO-66, as well as on the preparation of [Cu24(OH-mBDC)24]n metal-organic polyhedra (MOPs) and two new MOF structures {[Zn2(L1)(DPE)]∙4H2O}n and {[Zn3(L1)3(4,4’-azopy)]∙7.5H2O}n, where BTC = benzene-...
In this article, a significant aspect of Brønsted groups in the preparation of HPA/Al-SBA-15 catalyst by immobilising heteropoly acid H3PW12O40 (HPA) to mesoporous Al-SBA-15 support was studied. The crucial factors affected the preparation such as functional groups formed on the support, the use of HPA type for the immobilisation (commercial cataly...
p>Introducing additional meso- or macroporosity into traditionally microporous metal-organic frameworks (MOFs) is a very promising way to improve the catalytic performance of these materials, mostly due to the resultant reductions of diffusional barriers during liquid-phase or gas-phase reactions. Here we show that HKUST-1 can be successfully synth...
Introducing hierarchical pore structure to microporous materials such as metal-organic frameworks (MOFs) can be beneficial for reactions where the rate of reaction is limited by low rates of diffusion or high pressure drop. This advantageous pore structure can be obtained by defect formation, mostly via post-synthetic acid etching, which has been s...
Introduction of multiple pore size regimes into metal–organic frameworks (MOFs) to form hierarchical porous structures can lead to improved performance of the material in various applications. In many cases, where interactions with bulky molecules are involved, enlarging the pore size of typically microporous MOF adsorbents or MOF catalysts is cruc...
Introducing hierarchical pore structure to microporous materials such as metal-organic frameworks (MOFs) can be beneficial for reactions where the rate of reaction is limited by low rates of diffusion or high pressure drop. This advantageous pore structure can be obtained by defect formation, mostly via post-synthetic acid etching, which has been s...
In this study, the stability and the catalytic activity of an ordered mesoporous SBA-15 immobilized 12-tungstophosphoric acid (H3PW12O40, HPW) in the oxidative desulfurization (ODS) of benzothiophene (BT) and dibenzothiophene (DBT) were improved by a post-synthesis-grafting method. In this method, SBA-15 was functionalized to provide a large number...
My work involves design and characterisation of new HKUST-1 crystallites with tailored pore characteristics by using supercritical CO2. By using a diverse range of modern in-situ and ex-situ techniques, I found that using CO2 as pressure-tunable agent during the synthesis not only helps to induce MOF crystallisation from the resulting expanded liqu...
A series of Ag-AgBr/Al-MCM-41 nanocomposites were synthesized by dispersion of Ag-AgBr on mesoporous silica Al-MCM-41 obtained from natural bentonite. The synthesized Ag-AgBr/Al-MCM-41 composites with Ag nanoparticles growing on the surface of Al-MCM-41 were used for photocatalytic oxidative desulfurization of dibenzothiophene. The physical propert...
Synthetic K⁺ chabazite (KCHA), Cs⁺ chabazite (CsCHA) and Zn²⁺ chabazite (ZnCHA) have been synthesized and investigated in order to relate the differences in their crystalline structures to their thermal stability, moisture content and frequency dependent alternating current (AC) conductivity, permittivity and phase angle at a range of temperatures....
Synthetic K+ chabazite (KCHA), Cs+ chabazite (CsCHA) and Zn2+ chabazite (ZnCHA) were synthesized and compared in order to relate the differences in their crystalline structures to their thermal stability (TGA data), moisture content (TGA data) and frequency dependent alternating current (AC) conductivity (AC conductivity heating and cooling data),...
Keggin-type 12-tungstophosphoric [PW12O40]³⁻ heteropolyanions were successfully immobilized onto mesoporous material surface of SBA-15 functionalized using the (3-aminopropyl)triethoxysilane (APTES) synthesized by one-pot co-condensation method, also called one-step synthesis. The synthesized PW⁻-NH3⁺-SBA-15 catalyst was characterized by XRD, N2 ad...
It is shown that a crystalline metal-organic framework (HKUST-1) can be rapidly synthesized from DMSO/MeOH solution with greatly reduced amounts of organic solvents using a supercritical CO2 (scCO2) solvent expansion technique. The precursor solution is stable for months under ambient condi-tions, and CO2-driven MOF crystallization is achieved unde...
I have been shortlisted among 24 postgraduate researchers to present my research in the 3-Minute Thesis (3MT) semi-final competition at the University of Bristol. My talk titled From tuning tiny holes to making a big impact on the world aims to explain why and how holes in nanomaterials can save the world.
In this study, a porous material HKUST-1 was synthesised using supercritical CO2 (scCO2) with reduced amounts of conventional solvents. Our results show that with the presence of scCO2, HKUST-1 crystallites with hierarchical pore structure are formed. This material, with a mixture of large and small pore sizes, has potential applications in energy...
In this study, a porous material HKUST-1 was synthesised using supercritical CO2 (scCO2) with reduced amounts of conventional solvents. This can help to reduce the environmental impact from solvent waste in conventional synthesis of porous materials. Resulting data show that with the presence of scCO2, HKUST-1 crystallites with hierarchical pore st...
Projects
Projects (5)
Zeolites are of the few materials widely used in our everyday life: starting from personal consumption (detergents, cosmetics, etc.), to pharmaceuticals, medical, environmental, and major industrial applications. Due to their importance and wide use, new advances in preparing zeolites are of constant interest. This includes investigating greener preparation methods with less or no organic structural directing agents and engineering hierarchical zeolites and nanosized zeolites.
Investigating the crystallization mechanism and characterizing zeolites through advanced spectroscopic techniques pave the way for a deeper understanding of their properties and forecast their behavior in the targeted application, or new possible ones.
In this Special Issue, we invite contributions from all areas of zeolites. Topics include but are not limited to green synthesis methods of zeolites and related microporous materials, in situ incorporation of guest species or post-synthetic modification of zeolites, understanding zeolite crystallization, characterization of zeolites, and interdisciplinary applications.
Conducted INS experiments on four zeolites and crown-ether complexes to understand the interactions between the framework and the template.
Elucidate how pore size and surface area in the hierarchical porous copper-based metal-organic frameworks (MOFs) affect the conversion and the selectivity of the carbon monoxide (CO) oxidation, and comparing the catalytic activity of these MOFs to conventional catalysts.
