Designing efficient TiO2-based photoelectrocatalysis systems for chemical engineering and sensing

Wang, Shaobin; Zu, Meng; Zhou, Xiaosong; Lin, Hong; Peng, Feng; Zhang, Shanqing

doi:10.1016/j.cej.2019.122605

Cited by 111 publications

(64 citation statements)

References 200 publications

(218 reference statements)

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“…This way, heterojunction promote the separation of photoexcited electron hole pairs through several carrier-transfer pathways by keeping reduction and oxidation reactions at two different reaction sites. Moreover, the coupled semiconductors can extend the light response range to the visible [ 18 ].…”

Section: Introductionmentioning

confidence: 99%

Olive Leaves as Biotemplates for Enhanced Solar-Light Harvesting by a Titania-Based Solid

et al. 2020

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Olive leaves (by-product from olive oil production in olive mills) were used as biotemplates to synthesize a titania-based artificial olive leaf (AOL). Scanning electron microscopy (SEM) images of AOL showed the successful replication of trichomes and internal structure channels present in olive leaves. The BET surface area of AOL was 52 m2·g−1. X-ray diffraction (XRD) and Raman spectra revealed that the resulting solid was in the predominantly-anatase crystalline form (7.5 nm average particle size). Moreover, the synthesis led to a red-shift in light absorption as compared to reference anatase (gap energies of 2.98 and 3.2 eV, respectively). The presence of surface defects (as evidenced by X-ray photoelectron spectroscopy, XPS, and electron paramagnetic resonance spectroscopy, EPR) and doping elements (e.g., 1% nitrogen, observed by elemental analysis and XPS) could account for that. AOL was preliminarily tested as a catalyst for hydrogen production through glycerol photoreforming and exhibited an activity 64% higher than reference material Evonik P25 under solar irradiation and 144% greater under ultraviolet radiation (UV).

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Section: Introductionmentioning

confidence: 99%

Olive Leaves as Biotemplates for Enhanced Solar-Light Harvesting by a Titania-Based Solid

et al. 2020

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“…Many studies have confirmed that device design also plays a crucial role in improving the efficiency and reducing the cost of PC reactors [21][22][23]. A thin-layer reactor, which minimizes the thickness of the aqueous solution and the distance between the irradiation source and photocatalysts, is a promising device design for effective utilization of irradiation [24]. According to Beer's Law, light loss in aqueous solution is inevitable (Equation (7)):…”

Section: Introductionmentioning

confidence: 99%

Portable wastewater treatment system based on synergistic photocatalytic and persulphate degradation under visible light

Zhang

Liu

et al. 2021

Sci. China Mater.

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Highly efficient, low-cost, and portable wastewater treatment and purification solutions are urgently needed for aqueous pollution removal, especially at remote sites. Synergistic photocatalytic (PC) and persulphate (PS) degradation under visible light offers an exceptional alternative for this purpose. In this work, we coupled a TiO 2-based PC system with a PS oxidation system into a portable advanced oxidation device for rapid and deep degradation of organic contaminants in wastewater. Using hydrogenation, we fabricated hydrogenated anatase branched-rutile TiO 2 nanorod (H-AB@RTNR) photocatalysts which enable the PC degradation to occur under visible light and improve the utilization of solar energy. We also discovered that the addition of PS resulted in the synergistic degradation of tenacious and persistent organics, dramatically improving the extent and kinetics of the degradation. A degradation rate of 100% and a reaction rate constant of 0.0221 min −1 for degrading 1 L rhodamine B (20 mg L −1) were achieved in 120 min in a specially designed thin-layer cell under visible light irradiation. The superior performance of the synergistic PC and PS degradation system was also demonstrated in the degradation of real industrial wastewater. Both remarkable performances can be attributed to the heterophase junction and oxygen vacancies in the photocatalyst that facilitate the catalytic conversion of PS anions into highly active radicals (•SO 4 − and •OH). This work suggests that the as-proposed synergistic degradation design is a promising solution for building a portable wastewater treatment system.

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“…Among these MOXs, TiO 2 is one of the most versatile ones and is widely used for many different applications, including photocatalysis [ 16 ], sensors [ 17 , 18 ] and photovoltaic applications [ 19 ]. In particular, due to its exceptional physical/chemical properties, TiO 2 was extensively used for different sensing applications such as chemical/gas sensors [ 20 , 21 ], biosensors [ 17 , 22 ] and chemical oxygen demand (COD) [ 23 , 24 ] sensors [ 25 ]. It typically exhibits n-type conductivity and, in nanostructured form, is chemically stable, biocompatible, biodegradable and inexpensive [ 25 ].…”

Section: Introductionmentioning

confidence: 99%

1D Titanium Dioxide: Achievements in Chemical Sensing

et al. 2020

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For the last two decades, titanium dioxide (TiO2) has received wide attention in several areas such as in medicine, sensor technology and solar cell industries. TiO2-based gas sensors have attracted significant attention in past decades due to their excellent physical/chemical properties, low cost and high abundance on Earth. In recent years, more and more efforts have been invested for the further improvement in sensing properties of TiO2 by implementing new strategies such as growth of TiO2 in different morphologies. Indeed, in the last five to seven years, 1D nanostructures and heterostructures of TiO2 have been synthesized using different growth techniques and integrated in chemical/gas sensing. Thus, in this review article, we briefly summarize the most important contributions by different researchers within the last five to seven years in fabrication of 1D nanostructures of TiO2-based chemical/gas sensors and the different strategies applied for the improvements of their performances. Moreover, the crystal structure of TiO2, different fabrication techniques used for the growth of TiO2-based 1D nanostructures, their chemical sensing mechanism and sensing performances towards reducing and oxidizing gases have been discussed in detail.

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Designing efficient TiO2-based photoelectrocatalysis systems for chemical engineering and sensing

Cited by 111 publications

References 200 publications

Olive Leaves as Biotemplates for Enhanced Solar-Light Harvesting by a Titania-Based Solid

Olive Leaves as Biotemplates for Enhanced Solar-Light Harvesting by a Titania-Based Solid

Portable wastewater treatment system based on synergistic photocatalytic and persulphate degradation under visible light

1D Titanium Dioxide: Achievements in Chemical Sensing

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