Search query: Recent advances in TiO 2-based photocatalysis

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abstract: Semiconductor photocatalysis is a promising approach to combat both environmental pollution and the global energy shortage. Advanced TiO2 based photocatalysts with novel photoelectronic properties are benchmark materials that have been pursued for their high solar energy conversion efficiency. In general, the photocatalytic efficiency is affected by the degree of light absorption, charge separation, and surface reactivity. Consequently, in this review we first discuss a series of interesting studies that aim to extend the light absorption of TiO2 from UV wavelengths into the visible or even the near infrared region. We next focus on attempts to overcome the drawback that dopants usually act as charge recombination centres. We discuss the use of either selective local doping or the introduction of disorder together with doping, which aims to facilitate charge separation while preserving the visible light response. We also show that crystal facet engineering can endow TiO2 with superior physicochemical properties, thus yielding high surface reactivity in photocatalytic reactions. Finally, we examine the recent theoretical advances of TiO2 based photocatalysis.
author_names: Hua Xu

Shuxin Ouyang

Lequan Liu

Pakpoom Reunchan

Naoto Umezawa

Jinhua Ye
title: Recent advances in TiO 2 based photocatalysis
year: 2014

abstract: Hierarchical TiO2 superstructures with desired architectures and intriguing physico chemical properties are considered to be one of the most promising candidates for solving the serious issues related to global energy exhaustion as well as environmental deterioration via the well known photocatalytic process. In particular, TiO2 mesocrystals, which are built from TiO2 nanocrystal building blocks in the same crystallographical orientation, have attracted intensive research interest in the area of photocatalysis owing to their distinctive structural properties such as high crystallinity, high specific surface area, and single crystal like nature. The deeper understanding of TiO2 mesocrystals based photocatalysis is beneficial for developing new types of photocatalytic materials with multiple functionalities. In this paper, a comprehensive review of the recent advances toward fabricating and modifying TiO2 mesocrystals is provided, with special focus on the underlying mesocrystallization mechanism and controlling rules. The potential applications of as synthesized TiO2 mesocrystals in photocatalysis are then discussed to shed light on the structure performance relationships, thus guiding the development of highly efficient TiO2 mesocrystal based photocatalysts for certain applications. Finally, the prospects of future research on TiO2 mesocrystals in photocatalysis are briefly highlighted.
author_names: Boxue Zhang

Shengxin Cao

Meiqi Du

Xiaozhou Ye

Yun Wang

Jianfeng Ye
title: Titanium Dioxide TiO 2 Mesocrystals Synthesis Growth Mechanisms and Photocatalytic Properties
year: 2019

abstract: Photocatalysis, which is the catalyzation of redox reactions via the use of energy obtained from light sources, is a topic that has garnered a lot of attention in recent years as a means of addressing the environmental and economic issues plaguing society today. Of particular interest are photosynthesis can potentially mimic a variety of vital reactions, many of which hold the key to develop sustainable energy economy. In light of this, many of the technological and procedural advancements that have recently occurred in the field are discussed in this review, namely those linked to: (1) photocatalysts made from metal oxides, nitride, and sulfides; (2) photocatalysis via polymeric carbon nitride (PCN) and (3) general advances and mechanistic insights related to TiO 2 based catalysts. The challenges and opportunities that have arisen over the past few years are discussed in detail. Basic concepts and experimental procedures which could be useful for eventually overcoming the problems associated with photo catalysis are presented herein.
author_names: Yuanxing Fang

Yun Zheng

Tao Fang

Yong Chen

Yaodong Zhu

Qing Liang

Hua Sheng

Zhaosheng Li

Chuncheng Chen

Xinchen Wang
title: Photocatalysis: an overview of recent developments and technological advancements
venue: Science China Chemistry
year: 2019

abstract: Fundamental mechanisms of TiO(2) heterogeneous photocatalysis for degrading wastes are based on some radical reactions. Under ultraviolet light the photocatalysts produce holes and electrons, which subsequently initiate oxidation and reduction reactions. Holes and electrons can react directly with organic species adsorbed on the surface of the catalysts and also can transform into high energy chemical species such as hydroxyl radicals. Some organics such as dyes, which are sensitive to visible light, can also be degraded via Excited states. Langmuir Hinshelwood kinetics model describes the degradation rate expressions in terms of the disappearance of compounds. The kinetics of the photocatalysis is not only essential to practical applications but also is key aspect for understanding mechanisms of die photocatalysis.
author_names: Yc Tang

C Hu

Yz Wang
title: Recent advances in mechanisms and kinetics of TiO(2) photocatalysis
year: 2002

abstract: The ever increasing world population and the rapid growth of industrialization globally make necessary the development of clean technologies and affordable materials for remediating environmental pollution from petroleum based hydrocarbons and dyes, among others. Advanced photocatalytic materials may provide an excellent solution for environmental cleanup without generating toxic byproducts as they allow for the complete oxidation of the pollutants and their conversion to benign species. In this review, the basic principle of photocatalyst operation and the importance of bandgap engineering are discussed. TiO2 has been the default photocatalyst although it has several shortcomings. Doping of TiO2 with Ce has been explored extensively in the literature as a way to enable visible light activated photocatalysis and enhanced efficiency. Recent advances in the synthesis of Ce modified TiO2 photocatalytic materials along with photocatalytic reaction mechanisms are summarized.
author_names: Milind Pawar

Perena Gouma
title: A Brief Overview of TiO 2 Photocatalyst for Organic Dye Remediation Case Study of Reaction Mechanisms Involved in Ce TiO 2 Photocatalysts System
year: 2018

abstract: Abstract For the last few decades, photocatalysis has attracted as an emerging successful technology for purifying wastewater by dye degradation from households and industries. TiO 2 based photocatalysis has gained wide attention due to its importance in energy source as well as its outstanding involvement in the reduction in environmental problems. Consequently, researchers and scientists are looking for the synthesis of polyaniline TiO 2 based photocatalysts which are widely being used for the degradation of dyes. Lately, the use of polyaniline as photosensitizers has proved that it immensely enhances photodegradation by its excellent photocatalytic activity under both ultraviolet light and natural sunlight irradiation. Considering this most unique performance of Polyaniline TiO 2 based photocatalysis, the present review provides the recent advances and trends in the development of ultraviolet and visible light responsive polyaniline TiO 2 based photocatalysis for their potential application in environmental remediation by dye degradation. Graphic abstract
author_names: Nirmala Kumari Jangid

Sapana Jadoun

Anjali Yadav

Manish Kumar Srivastava

Navjeet Kaur
title: Polyaniline TiO2 based photocatalysts for dyes degradation
venue: Polymer Bulletin
year: 2020

abstract: Recent advances in synchrotron based x ray spectroscopy enable materials scientists to emanate fingerprints on important materials properties, e.g. electronic, optical, structural, and magnetic properties, in real time and under nearly real world conditions. This characterization in combination with optimized materials synthesis routes and tailored morphological properties could contribute greatly to the advances in solid state electronics and renewable energy technologies. In connection to this, such perspective reflects the current materials research in the space of emerging energy technologies, namely photocatalysis, with a focus on transition metal oxides, mainly on the Fe 2 O 3 and TiO 2 based materials.
author_names: Yifan Ye

Mukes Kapilashrami

Cheng-Hao Chuang

Yi-sheng Liu

Per Anders Glans

Jinghua Guo
title: X ray spectroscopies studies of the 3d transition metal oxides and applications of photocatalysis
year: 2017

author_names: Jia-Yan Chen

Dongyuan Zhao
title: Recent advances in TiO 2 based catalysts for N 2 reduction reaction
year: 2021

abstract: The lithium ion battery (LIB) has proven to be a very reliably used system to store electrical energy, for either mobile or stationary applications. Among others, TiO2 based anodes are the most attractive candidates for building safe and durable lithium ion batteries with high energy density. A variety of TiO2 nanostructures has been thoroughly investigated as anodes in LIBs, e.g. nanoparticles, nanorods, nanoneedles, nanowires, and nanotubes discussed either in their pure form or in composites. In this review, we present the recent developments and breakthroughs demonstrated to synthesize safe, high power, and low cost nanostructured titania based anodes. The reader is provided with an in depth review of well oriented TiO2 based nanotubes fabricated by anodic oxidation. Other strategies for modification of TiO2 based anodes with other elements or materials are also highlighted in this report.
author_names: Mahmoud Madian

Alexander Eychmuller

Lars Giebeler
title: Current Advances in TiO 2 Based Nanostructure Electrodes for High Performance Lithium Ion Batteries
year: 2018

abstract: Photocatalysis is a multifunctional phenomenon that can be employed for energy applications such as H2 production, CO2 reduction into fuels, and environmental applications such as pollutant degradations, antibacterial disinfection, etc. In this direction, it is not an exaggerated fact that TiO2 is blooming in the field of photocatalysis, which is largely explored for various photocatalytic applications. The deeper understanding of TiO2 photocatalysis has led to the design of new photocatalytic materials with multiple functionalities. Accordingly, this paper exclusively reviews the recent developments in the modification of TiO2 photocatalyst towards the understanding of its photocatalytic mechanisms. These modifications generally involve the physical and chemical changes in TiO2 such as anisotropic structuring and integration with other metal oxides, plasmonic materials, carbon based materials, etc. Such modifications essentially lead to the changes in the energy structure of TiO2 that largely boosts up the photocatalytic process via enhancing the band structure alignments, visible light absorption, carrier separation, and transportation in the system. For instance, the ability to align the band structure in TiO2 makes it suitable for multiple photocatalytic processes such as degradation of various pollutants, H2 production, CO2 conversion, etc. For these reasons, TiO2 can be realized as a prototypical photocatalyst, which paves ways to develop new photocatalytic materials in the field. In this context, this review paper sheds light into the emerging trends in TiO2 in terms of its modifications towards multifunctional photocatalytic applications.
author_names: Mohan Sakar

R Mithun Prakash

Trong-On Do
title: Insights into the TiO 2 Based Photocatalytic Systems and Their Mechanisms
year: 2019