Strategies for improving the efficiency of semiconductor metal oxide photocatalysis

Djurišić, Aleksandra B.; Leung, Yu Hang; Ng, Alan Man Ching

doi:10.1039/c4mh00031e

Cited by 331 publications

(152 citation statements)

References 126 publications

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“…The holes are created in the valence band and the electron from the donor molecule can move to this hole. At the same time, an electron from the valence band can be transferred to the acceptor [9,10]. For this reason, the photo catalyst can take the interaction with the molecules at the material surface.…”

Section: Introductionmentioning

confidence: 99%

Surface Modification of PSF/Tio2 Membranes Using Silane Coupling Agents and Dc Plasma Technique

2017

MJAS

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Preparation and surface modification of PSF/TiO 2 membranes by DC Ar-plasma were conducted to improve membrane hydrophilicity and gas permeation efficiency. Using TiO 2 as a photocatalyst, photocatalysis could be induced upon the plasma exposure. Radicals from this process led to an increase in the membrane hydrophilicity. In order to improve the dispersion quality of TiO 2 in an organic membrane, methyltrimethoxysilane (TMMS) or ethyltrimethoxysilane (TEMS) was utilized as coupling agents to modify the TiO 2 surface prior to blending. The coupling agents caused organic silane bonds on the TiO 2 surface leading to a better dispersion of nanoparticle on the membrane matrix. The incorporation of modified-TiO 2 tended to decrease membrane water contact angles (WCA) to the lowest value when compared with PSF membranes with unmodified TiO 2 and neat PSF membranes. Results also showed that TMMS could produce better outcomes compared to TEMS. It was found that the modified-TiO 2 could decrease the WCA. More importantly, pressure normalized flux of CO 2 and CH 4 gases of PSF/modified-TiO 2 membrane was found to increase with slightly decrease in the selectivity of CO 2 /CH 4 .Keywords: silane coupling agent, surface modification, gas separation membrane, low pressure DC-plasma, polysulfone Abstrak Penyediaan dan modifikasi permukaan membran PSF/TiO 2 oleh DC Ar-plasma telah dijalankan untuk meningkatkan kehidrofilikan membran dan kecekapan penyerapan gas. Menggunakan TiO 2 sebagai foto-pemangkin, fotopemangkinan dapat didorong apabila terdedah kepada plasma. Radikal daripada proses ini membawa kepada peningkatan dalam kehidrofilikan membran. Untuk meningkatkan kualiti penyebaran TiO 2 dalam membran organik, metiltrimetoksisilana (TMMS) atau etiltrimetoksisilana (TEMS) telah digunakan sebagai agen gandingan untuk mengubah suai permukaan TiO 2 sebelum campuran. Ejen-ejen gandingan menyebabkan ikatan silana organik di permukaan TiO 2 yang membawa kepada penyebaran nanopartikel yang lebih baik pada matriks membran. Penggabungan TiO 2 yang diubahsuai cenderung untuk mengurangkan sudut sentuhan air membran (WCA) kepada nilai yang paling rendah berbanding membran PSF dengan TiO 2 yang tidak diubahsuai dan membran PSF kawalan. Keputusan juga menunjukkan bahawa TMMS boleh menghasilkan hasil yang lebih baik berbanding PPSMI. Ia telah mendapati bahawa TiO 2 yang diubahsuai boleh mengurangkan WCA. Lebih penting lagi, tekanan fluks normal gas CO 2 dan CH 4 daripada membran PSF/TiO 2 yang diubahsuai didapati meningkat dengan sedikit penurunan kepilihan CO 2 /CH 4 .Kata kunci: ejen gandingan silana, modifikasi permukaan, membran pemisahan gas, tekanan rendah dc-plasma, polisulfon

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Section: Introductionmentioning

confidence: 99%

Surface Modification of PSF/Tio2 Membranes Using Silane Coupling Agents and Dc Plasma Technique

2017

MJAS

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“…Based on the fundamental principles of semiconductor photocatalysis, the recombination between the electron and the hole is detrimentalt ot he efficiency of as emiconductor photocatalyst.F or higherp hotocatalytic efficiency, the electron-holep airs should be efficientlys eparated, and chargess hould be rapidlyt ransferred across the surface/interface to restrain the recombination. [9,10] In addition, the potential success of semiconducting photocatalysts relies on the efficient absorption of photon energy from sunlight to create active chargec arries, which are capable of implementing the redox processes towardshydrogen generation or degradation of pollutants. As uitable semiconductor should possesst he band gap of at least 1.23 eV,w hich equals to wavelengths of 1000 nm, to fulfil the redox potentials of the H + /H 2 and O 2 /H 2 Op airs.…”

Section: Introductionmentioning

confidence: 99%

Nanohybrids of Two‐Dimensional Transition‐Metal Dichalcogenides and Titanium Dioxide for Photocatalytic Applications

Rahmanian

Malekfar

Pumera

2017

Chemistry A European J

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The ever increasing need for renewable and clean energy resources as well as environmental concerns are considered as two seriousc hallenges of today's society.P hotocatalysis has proved to be ar eliable ande ffective technology to overcome these issues. However, to bring the full potential of this approach into reality,t wo main hurdles of fast charge recombination and the limited visible light absorption should be tackled. To address these obstacles, nanocomposites based on titanium dioxide nanostructures and semiconducting two-dimensional transition-metal dichalcogenidesh ave been developed and proven to be excellent photocatalysts.I nt his review,w ew ill overview the recent developments on the fabrication and rational design of these nanocomposites both for hydrogen productiona nd photocatalytic degradation of pollutants with emphasis on those appealing structures.

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“…Reproduced from Ref. [155] with permission from The Royal Society of Chemistry ferroelectric materials, and (iii) electrostatic potentials in the surfaces as a function of charged adsorbate present on them [156][157][158]. Directed charge transport can also be facilitated by the electronic band bending present in the surface or near surface region of the photocatalysts.…”

Section: Materials and Electronic Properties Required For Photocatalystsmentioning

confidence: 99%

“…On the other hand, dye adsorption onto the photocatalyst surface is normally considered the second most essential component for photocatalytic dye degradation. One of the major factors that determines the dye adsorption onto the photocatalysts surfaces is the surface area [155].…”

Section: Materials and Electronic Properties Required For Photocatalystsmentioning

confidence: 99%

Metal oxide semiconducting interfacial layers for photovoltaic and photocatalytic applications

Elumalai

Chellappan

Jose

et al. 2015

Mater Renew Sustain Energy

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The present review rationalizes the significance of the metal oxide semiconductor (MOS) interfaces in the field of photovoltaics and photocatalysis. This perspective considers the role of interface science in energy harvesting using organic photovoltaics (OPVs) and dye-sensitized solar cells (DSSCs). These interfaces include large surface area junctions between photoelectrodes and dyes, the interlayer grain boundaries within the photoanodes, and the interfaces between photoactive layers and the top and bottom contacts. Controlling the collection and minimizing the trapping of charge carriers at these boundaries is crucial to overall power conversion efficiency of solar cells. Similarly, MOS photocatalysts exhibit strong variations in their photocatalytic activities as a function of band structure and surface states. Here, the MOS interface plays a vital role in the generation of OH radicals, which forms the basis of the photocatalytic processes. The physical chemistry and materials science of these MOS interfaces and their influence on device performance are also discussed.

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Strategies for improving the efficiency of semiconductor metal oxide photocatalysis

Cited by 331 publications

References 126 publications

Surface Modification of PSF/Tio2 Membranes Using Silane Coupling Agents and Dc Plasma Technique

Surface Modification of PSF/Tio2 Membranes Using Silane Coupling Agents and Dc Plasma Technique

Nanohybrids of Two‐Dimensional Transition‐Metal Dichalcogenides and Titanium Dioxide for Photocatalytic Applications

Metal oxide semiconducting interfacial layers for photovoltaic and photocatalytic applications

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