scholarly journals One-Dimensional Nanostructured TiO2for Photocatalytic Degradation of Organic Pollutants in Wastewater

2014 ◽  
Vol 2014 ◽  
pp. 1-14 ◽  
Author(s):  
Ting Feng ◽  
Gen Sheng Feng ◽  
Lei Yan ◽  
Jia Hong Pan
Keyword(s):  
Photocatalytic Activity ◽  
Photocatalytic Degradation ◽  
Organic Pollutants ◽  
Photocatalytic Oxidation ◽  
Sol Gel ◽  
Chemical Vapor ◽  
Inorganic Element ◽  
One Dimensional ◽  
Practical Applications ◽  
Excellent Photocatalytic Activity

The present paper reviews the progress in the synthesis of one-dimensional (1D) TiO2nanostructures and their environmental applications in the removal of organic pollutants. According to the shape, 1D TiO2nanostructures can be divided into nanorods, nanotubes, nanowires/nanofibers, and nanobelts. Each of them can be synthesized via different technologies, such as sol-gel template method, chemical vapor deposition, and hydrothermal method. These methods are discussed in this paper, and the recent development of the synthesis technologies is also presented. Furthermore, the organic pollutants, degradation using the synthesized 1D TiO2nanostructures is studied as an important application of photocatalytic oxidation (PCO). The 1D nanostructured TiO2exhibited excellent photocatalytic activity in a PCO process, and the mechanism of photocatalytic degradation of organic pollutants is also discussed. Moreover, the modification of 1D TiO2nanostructures using metal ions, metal oxide, or inorganic element can further enhance the photocatalytic activity of the photocatalyst. This phenomenon can be explained by the suppression of e−-h+pairs recombination rate, increased specific surface area, and reduction of band gap. In addition, 1D nanostructured TiO2can be further constructed as a film or membrane, which may extend its practical applications.

Photocatalytic Degradation of Acetaldehyde by Sol-Gel TiO2 Nanoparticles: Effect of the Physicochemical Properties on the Photocatalytic Activity

2011 ◽  
Vol 691 ◽  
pp. 92-98 ◽  
Author(s):  
R. Carrera ◽  
A.L. Vázquez ◽  
S. Castillo ◽  
E.M. Arce Estrada
Keyword(s):  
Photocatalytic Activity ◽  
Photocatalytic Degradation ◽  
Surface Area ◽  
Photocatalytic Oxidation ◽  
Crystal Size ◽  
Uv Light ◽  
High Surface ◽  
Sol Gel ◽  
High Surface Area ◽  
Synthesis Method

Nowadays, nanostructured semiconductor materials offer promising opportunities for a new generation of materials such as TiO2nanoparticles with improved properties for their application in the environmental catalysis field. It is well known that the phocatalytic activity of the TiO2nanoparticles is strongly dependent on the surface area, crystal size, phase composition and synthesis method. Thus, the preparation conditions clearly affect the photocatalytic activity of the TiO2nanoparticles. This work deals with the study of the structure of TiO2nanoparticles that were synthesized by the sol-gel method (using isopropanol as solvent), and calcined at 200 and 500°C. The obtained samples were characterized by the XRD-Rietveld refinement, BET and TEM techniques; and tested in the photodecomposition of acetaldehyde. The evaluations were carried out at room temperature by using CH3CHO (300 ppmv), O2(2.0 %) in helium balance in a quartz glass photoreactor (gas phase) with a 365-UV light lamp. According to the results, the sample that presented the highest activity in the photocatalytic oxidation of acetaldehyde (96.4%) was the one annealed at 200 °C. This sample showed the following proportion of phases: anatase (62.88%) with a tetragonal structure (a=0.3790926, b=0.3790926, c=0.9495732) nm; and b) brookite (37.12%) with an orthorhombic structure (a=0.9167624, b=0.5416461, c=0.5210546) nm. The surface area was 189 m2/g and the average crystal size was 7.03 nm. From the results, it can be seen that this material showed high activity in the photocatalytic degradation of acetaldehyde because of: the presence of a mixture of the anatase (higher proportion) and brookite phases, nanometric crystal size and high surface area obtained in this TiO2material. According to the aforementioned, this material can be considered as a good option for the decomposition of acetaldehyde and other volatile organic compounds (VOCs) in confined spaces.

Study on Photocatalytic Degradation of MG by PW12-TiO2/SiO2

2014 ◽  
Vol 675-677 ◽  
pp. 448-454
Author(s):  
Xi Quan Wang ◽  
Qi Zhe Yang ◽  
Shi Ying Fan ◽  
Yuan Li
Keyword(s):  
Aqueous Solution ◽  
Photocatalytic Activity ◽  
Catalytic Activity ◽  
Photocatalytic Degradation ◽  
Photocatalytic Oxidation ◽  
Phosphotungstic Acid ◽  
Anatase Phase ◽  
Sol Gel ◽  
High Catalytic Activity ◽  
Composite Oxides

To investigate the photocatalytic degradation of MG by PW12-TiO2/SiO2, in this study PW12-TiO2/SiO2 composite oxides were prepared by sol-gel and hydrothermal strategy. The prepared photocatalysits were characterized by XRD, BET,TEM and EDS techniques and the configuration charateristics of PW12-TiO2/SiO2 nanoparticles were systematically investigated. Photocatalytic activity was checked by the photocatalytic oxidation of MG dye in aqueous solution. The results showed that the phosphotungstic acid still has the Keggin structure. The anatase phase of titanium oxid is identified by XRD. The result of the present work implied that compared with pure TiO2, the PW12-TiO2/SiO2 composite oxides have stronger catalytic activity, good particles dispersion and bigger specific surface area. The optimal concentration of MG was 20mg.L-1, the best dosage of PW12-TiO2/SiO2 was 1g.L-1. Moreover, after three times of recycling, the catalyst still has high catalytic activity.

A review on TiO2-based composites for superior photocatalytic activity

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Wail Al Zoubi ◽  
Abbas Ali Salih Al-Hamdani ◽  
Baek Sunghun ◽  
Young Gun Ko
Keyword(s):  
Photocatalytic Activity ◽  
Organic Pollutants ◽  
Cost Efficiency ◽  
High Stability ◽  
Photocatalytic Oxidation ◽  
Oxidation Process ◽  
Ambient Conditions ◽  
Photoelectrochemical Activity ◽  
As Doping ◽  
Degradation Of Pollutants

Abstract Heterogeneous photocatalysts was a promising material for removing organic pollutants. Titanium dioxide (TiO2) was a suitable photocatalyst for its cost efficiency and high stability to reduce various pollutants. Enhancing TiO2 photocatalyst performance by doping with changed metals or non-metal ions and organic compounds have been reviewed. These methods could enhance photoelectrochemical activity via: (i) by a donor of electrons via electron-donor agents that would produce particular defects in TiO2 structure and capture transporters of charge; (ii) by reducing recombination rate of the charge transporters and increasing degradation of pollutants. This study investigates the modification approaches of TiO2 that comprise methods for overcoming the essential TiO2 restrictions and enhancing the photocatalytic degradation of organic pollutants. Consequently, it emphasized on the current progress of modified-TiO2 used for different pollutants in ambient conditions. Amendment techniques, such as inorganic and organic parts as doping, are studied. The reported experimental results obtained with the photocatalytic oxidation process for degrading organic pollutants were also collected and assessed.

scholarly journals Microwave treated sol–gel synthesis and characterization of hybrid ZnS–RGO composites for efficient photodegradation of dyes

2017 ◽  
Vol 41 (4) ◽  
pp. 1723-1735 ◽  
Author(s):  
Lellala Kashinath ◽  
Keerthiraj Namratha ◽  
Shivanna Srikantaswamy ◽  
Ajayan Vinu ◽  
Kullaiah Byrappa
Keyword(s):  
Electron Transfer ◽  
Photocatalytic Activity ◽  
Sol Gel ◽  
Charge Recombination ◽  
Synthesis And Characterization ◽  
Excellent Photocatalytic Activity ◽  
Sol Gel Synthesis

Excellent photocatalytic activity by highly photo-responsive electron transfer from ZnS–RGO, and RGO acts as an electron reservoir and effectively suppresses charge recombination.

Bismuth chromate (Cr2Bi3O11): A new bismuth-based semiconductor with excellent photocatalytic activity

2022 ◽  
Author(s):  
Xinyu Gao ◽  
Kelei Huang ◽  
Zisheng Zhang ◽  
Xiangchao Meng
Keyword(s):  
Photocatalytic Activity ◽  
Band Gap ◽  
Oxygen Evolution ◽  
Organic Pollutants ◽  
Excellent Photocatalytic Activity ◽  
Mixing Method

A novel bismuth chromate material (Cr2Bi3O11) was synthesized by a direct mixing method with higher photocatalytic activity in both organic pollutants’ detoxification and oxygen evolution. Cr2Bi3O11 with a band gap...

scholarly journals Hydrothermal synthesis of cotton-based BiVO4/Ag composite for photocatalytic degradation of C.I. Reactive Black 5

RSC Advances ◽  
2020 ◽  
Vol 10 (64) ◽  
pp. 39295-39303
Author(s):  
Jiangang Qu ◽  
Jiaqi Qian ◽  
Mengtao Wu ◽  
Qinghui Mao ◽  
Min Li
Keyword(s):  
Composite Material ◽  
Photocatalytic Activity ◽  
Hydrothermal Synthesis ◽  
Photocatalytic Degradation ◽  
Reactive Black 5 ◽  
Photodegradation Mechanism ◽  
Excellent Photocatalytic Activity

BiVO4/Ag/cotton-K composite material exhibited excellent photocatalytic activity and recyclability, and the photodegradation mechanism of RB5 by BiVO4/Ag/cotton-K was also proposed.

Ultrathin HNb3O8 nanosheets with oxygen vacancies for enhanced photocatalytic oxidation of amines under visible light irradiation

2019 ◽  
Vol 7 (10) ◽  
pp. 5493-5503 ◽  
Author(s):  
Junli Chen ◽  
Hai Wang ◽  
Zhiqiang Zhang ◽  
Lifeng Han ◽  
Yonghui Zhang ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Photocatalytic Oxidation ◽  
Oxygen Vacancies ◽  
Hydrothermal Process ◽  
Light Irradiation ◽  
Excellent Photocatalytic Activity ◽  
Simple Hydrothermal Process

Ultrathin HNb3O8 nanosheets with oxygen vacancies were successfully synthesized by a simple hydrothermal process. HNb3O8 NSs showed excellent photocatalytic activity.

Preparation of CNTs/TiO2/CS Film and its Photocatalytic Activity

2011 ◽  
Vol 287-290 ◽  
pp. 1607-1611
Author(s):  
Li Ping Zeng ◽  
Quan Zhang ◽  
Guo Qiang Zhang ◽  
Li Hui Zou
Keyword(s):  
Photocatalytic Activity ◽  
Photocatalytic Degradation ◽  
Sol Gel ◽  
Synergetic Effect ◽  
Structure And Property ◽  
Catalyst Film ◽  
Photocatalytic Activities ◽  
Ft Ir ◽  
Gaseous Formaldehyde ◽  
Carbon Nano Tube

In this work, carbon nano-tube/TiO2(CNTs/TiO2) nanocomposites were prepared using a conventional sol-gel method. To further obtain a uniform catalyst film, chitosan (CS) was used as a crosslinker for the CNTs/TiO2composite. The structure and property of CNTs/TiO2/CS film were characterized using XRD, FT-IR, TEM, SEM, and UV-vis. The photocatalytic activities of CNTs/TiO2/CS film were measured through the photocatalytic degradation of gaseous formaldehyde. Compared with the commercial TiO2, higher degradation was achieved with the CNTs/TiO2/CS film due to stronger absorbability and synergetic effect among CNTs, TiO2, and CS.

Antimony sulphoiodide (SbSI), a narrow band-gap non-oxide ternary semiconductor with efficient photocatalytic activity

RSC Advances ◽  
2016 ◽  
Vol 6 (107) ◽  
pp. 105980-105987 ◽  
Author(s):  
Muthusamy Tamilselvan ◽  
Aninda J. Bhattacharyya
Keyword(s):  
Photocatalytic Activity ◽  
Photocatalytic Degradation ◽  
Band Gap ◽  
Organic Pollutants ◽  
Narrow Band ◽  
Electronic Configuration ◽  
Ternary Semiconductor ◽  
Very High

A highly crystalline 3D urchin-shaped SbSI with an ns2 cationic electronic configuration displays very high and efficient photocatalytic degradation of organic pollutants.

Hierarchical Z-scheme 1D/2D architecture with TiO2 nanowires decorated by MnO2 nanosheets for efficient adsorption and full spectrum photocatalytic degradation of organic pollutants

2020 ◽  
Vol 10 (11) ◽  
pp. 3603-3612
Author(s):  
Jiejing Zhang ◽  
Yajie Hu ◽  
Hong Zheng ◽  
Pengyi Zhang
Keyword(s):  
Photocatalytic Activity ◽  
Photocatalytic Degradation ◽  
Organic Pollutants ◽  
Organic Pollutant ◽  
Pollutant Removal ◽  
Tio2 Nanowires ◽  
Full Spectrum ◽  
Mno2 Nanosheets ◽  
Excellent Stability

A novel hierarchical 1D/2D TiO2/MnO2 composite shows superior adsorption, full spectrum photocatalytic activity and excellent stability for organic pollutant removal.

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