Visible-light activated titania perovskite photocatalysts: Characterisation and initial activity studies

Fei, Daphne Qiong; Hudaya, Tedi; Adesina, Adesoji A.

doi:10.1016/j.catcom.2005.01.006

Cited by 32 publications

(12 citation statements)

References 9 publications

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“…As a consequence the recombination rate increases exponentially with the dopant concentration because the average distance between the trap sites decreases with increasing number of dopant confined within a particle [15,126]. The similar line of reasoning holds well towards the lower activity for other doped samples at high dopant concentration (≥0.1 at.%).…”

Section: Degradation Studies Of Ic/np Under Uv/solar Lightsupporting

confidence: 62%

Influence of physicochemical–electronic properties of transition metal ion doped polycrystalline titania on the photocatalytic degradation of Indigo Carmine and 4-nitrophenol under UV/solar light

Devi

Kumar

2011

Applied Surface Science

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at an optimum concentration of dopant. Based on the experimental results obtained, it is proposed that the existence of dopant with half filled electronic configuration in TiO 2 matrix which is known to enhance the photocatalytic activity is not universal! Rather it is a complex function of several physicochemical-electronic properties of doped titania. Enhanced photocatalytic activity of Mn 2+ (0.06 at.%)-TiO 2 was attributed to the combined factors of high positive reduction potential of Mn 2+ /Mn 3+ pairs, synergistic effects in the mixed polymorphs of anatase and rutile, smaller crystallite size with high intimate contact between two phases and favorable surface structure of the photocatalyst. Despite the intense research devoted to transition metal ion doped TiO 2 , it is rather difficult to make unifying conclusion which is highlighted in this study.

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Section: Degradation Studies Of Ic/np Under Uv/solar Lightsupporting

confidence: 62%

Influence of physicochemical–electronic properties of transition metal ion doped polycrystalline titania on the photocatalytic degradation of Indigo Carmine and 4-nitrophenol under UV/solar light

Devi

Kumar

2011

Applied Surface Science

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“…94 Based on UV-vis diffuse reflectance measurements, it was observed that the perovskite catalysts exhibited significantly lower BG (1.45-2.15 eV) than P25 (3.2 eV); however, the E bg remained almost unchanged at a doping level of x 4 0.1, as shown in Fig. 14. 94 Based on UV-vis diffuse reflectance measurements, it was observed that the perovskite catalysts exhibited significantly lower BG (1.45-2.15 eV) than P25 (3.2 eV); however, the E bg remained almost unchanged at a doping level of x 4 0.1, as shown in Fig. 14.…”

Section: Degradation Of Organic Dyesmentioning

confidence: 94%

“…67,[92][93][94] The catalytic activity of a perovskite is mainly determined by the B-site element(s). 67,[92][93][94] The catalytic activity of a perovskite is mainly determined by the B-site element(s).…”

Section: Water Splitting Reactionmentioning

confidence: 99%

Research progress of perovskite materials in photocatalysis- and photovoltaics-related energy conversion and environmental treatment

2015

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Meeting the growing global energy demand is one of the important challenges of the 21st century. Currently over 80% of the world's energy requirements are supplied by the combustion of fossil fuels, which promotes global warming and has deleterious effects on our environment. Moreover, fossil fuels are non-renewable energy and will eventually be exhausted due to the high consumption rate. A new type of alternative energy that is clean, renewable and inexpensive is urgently needed. Several candidates are currently available such as hydraulic power, wind force and nuclear power. Solar energy is particularly attractive because it is essentially clean and inexhaustible. A year's worth of sunlight would provide more than 100 times the energy of the world's entire known fossil fuel reserves. Photocatalysis and photovoltaics are two of the most important routes for the utilization of solar energy. However, environmental protection is also critical to realize a sustainable future, and water pollution is a serious problem of current society. Photocatalysis is also an essential route for the degradation of organic dyes in wastewater. A type of compound with the defined structure of perovskite (ABX3) was observed to play important roles in photocatalysis and photovoltaics. These materials can be used as photocatalysts for water splitting reaction for hydrogen production and photo-degradation of organic dyes in wastewater as well as for photoanodes in dye-sensitized solar cells and light absorbers in perovskite-based solar cells for electricity generation. In this review paper, the recent progress of perovskites for applications in these fields is comprehensively summarized. A description of the basic principles of the water splitting reaction, photo-degradation of organic dyes and solar cells as well as the requirements for efficient photocatalysts is first provided. Then, emphasis is placed on the designation and strategies for perovskite catalysts to improve their photocatalytic activity and/or light adsorption capability. Comments on current and future challenges are also provided. The main purpose of this review paper is to provide a current summary of recent progress in perovskite materials for use in these important areas and to provide some useful guidelines for future development in these hot research areas.

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“…This considered, some researchers are utilizing d 0 perovskite as photocatalysts under visible irradiation. Solid solution perovskites of d 0 metals such as CeCo 0.05 Ti 0.95 O 3.97 [ 136 ] or d 0 metal compounds incorporating heavier ions such as Bi, Ag, In or Sn to produce AgNbO 3 [ 137 ] NiNb 2 O 6 NiTa 2 O 6 [ 138 ] and other analogues have been reported as visible light activated photocatalysts. With the niobate materials such as Bi 2 O 2 CO 3 /Bi 3 NbO 7 composites, K 4 Nb 6 O 17 and Ag/Cu modified K 4 Nb 6 O 17 reported for the inactivation of E. coli [ 139 , 140 ].…”

Section: Novel Photocatalytic Materialsmentioning

confidence: 99%

A Review of Heterogeneous Photocatalysis for Water and Surface Disinfection

et al. 2015

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Photo-excitation of certain semiconductors can lead to the production of reactive oxygen species that can inactivate microorganisms. The mechanisms involved are reviewed, along with two important applications. The first is the use of photocatalysis to enhance the solar disinfection of water. It is estimated that 750 million people do not have accessed to an improved source for drinking and many more rely on sources that are not safe. If one can utilize photocatalysis to enhance the solar disinfection of water and provide an inexpensive, simple method of water disinfection, then it could help reduce the risk of waterborne disease. The second application is the use of photocatalytic coatings to combat healthcare associated infections. Two challenges are considered, i.e., the use of photocatalytic coatings to give “self-disinfecting” surfaces to reduce the risk of transmission of infection via environmental surfaces, and the use of photocatalytic coatings for the decontamination and disinfection of medical devices. In the final section, the development of novel photocatalytic materials for use in disinfection applications is reviewed, taking account of materials, developed for other photocatalytic applications, but which may be transferable for disinfection purposes.

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Visible-light activated titania perovskite photocatalysts: Characterisation and initial activity studies

Cited by 32 publications

References 9 publications

Influence of physicochemical–electronic properties of transition metal ion doped polycrystalline titania on the photocatalytic degradation of Indigo Carmine and 4-nitrophenol under UV/solar light

Influence of physicochemical–electronic properties of transition metal ion doped polycrystalline titania on the photocatalytic degradation of Indigo Carmine and 4-nitrophenol under UV/solar light

Research progress of perovskite materials in photocatalysis- and photovoltaics-related energy conversion and environmental treatment

A Review of Heterogeneous Photocatalysis for Water and Surface Disinfection

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