Catalytic inactivation of bacteria using Pd-modified titania

Quisenberry, Leah; Loetscher, Luke H.; Boyd, Joel E.

doi:10.1016/j.catcom.2009.03.013

Cited by 23 publications

(5 citation statements)

References 37 publications

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“…Dopants are metal ions that can shift absorption of the photocatalyst to the visible region, the advantage of which is that it negates the use of UV light. Many studies have shown that doping has produced effective photocatalysts capable of destroying pathogenic microorganism under visible light [83][84][85][86][87]. Rengifo-Rengifo-Herrera et al [83] showed that N, S co-doped Degussa P-25 powders were very effective in inactivating E. coli using visible light ( figure 4).…”

Section: Figurementioning

confidence: 99%

“…The main oxidative species were suggested to be the superoxide radical (O2 − ) and singlet oxygen ( 1 O2). Other effective dopants include copper [84], palladium oxide [67], platinium [86] and silver [36,46,87]. Liga et al [46] showed that silver doping of TiO2 nanoparticles significantly enhanced bacteriophage MS2 inactivation and that the inactivation rate increased with silver content.…”

Section: Figurementioning

confidence: 99%

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Removal of microorganisms and their chemical metabolites from water using semiconductor photocatalysis

Robertson

Bahnemann

2012

Journal of Hazardous Materials

190

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Semiconductor photocatalysis has been applied to the remediation of an extensive range of chemical pollutants in water over the past 30 years. The application of this versatile technology for removal of micro-organisms and cyanotoxins has recently become an area that has also been the subject of extensive research particularly over the past decade. This paper considers recent research in the application of semiconductor photocatalysis for the treatment of water contaminated with pathogenic micro-organisms and cyanotoxins. The basic processes involved in photocatalysis are described and examples of recent research into the use of photocatalysis for the removal of a range of microorganisms are detailed. The paper concludes with a review of the key research on the application of this process for the removal of chemical metabolites generated from cyanobacteria.

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Section: Figurementioning

confidence: 99%

Section: Figurementioning

confidence: 99%

Removal of microorganisms and their chemical metabolites from water using semiconductor photocatalysis

Robertson

Bahnemann

2012

Journal of Hazardous Materials

190

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“…The Fermi levels of these noble metals are lower than that of TiO 2 , thus photo-generated electrons can be transferred from conduction band to metal particles deposited on the surface of TiO 2 , preventing the possible recombination of electron-hole. The first study on photo-electrochemically inactivation of bacterial cells was conducted on Ptloaded TiO 2 [13] and the follow-up reports confirmed the importance of Pt-loading [43,44]. Nevertheless, Ag represents the most popular substance for enhancing disinfection activity because of the antimicrobial property of Ag compounds and Ag + ions [45,46].…”

Section: Surface Modification Of Tio 2 By Noble Metalsmentioning

confidence: 97%

Photocatalysts for Solar-Induced Water Disinfection: New Developments and Opportunities

Wang

Wong

2012

MSF

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Recent years have seen a surge of interest in the application of solar energy for water disinfection by using nanostructured photocatalysts elaborately designed and fabricated. Photocatalysis has its unique advantage for utilizing sunlight to drive the disinfection process. The highly reactive oxygen species (ROS) serve as the main oxidants and are capable of inactivating microorganisms, including viruses, bacteria, spores and protozoa. This chapter presents an overview of current research activities that center on the preparation, characterization and application of highly efficient photocatalysts for water disinfection under both UV and visible light irradiation. It is organized into two major parts. One is the development of TiO2-based photocatalysts including surface noble metal modified, ion doped, dye-sensitized, and composite TiO2. The other part is the introduction of new types of photocatalysts and advanced technologies that have recently fascinated the scientific community. Particular attention is given to the pioneering fields such as graphene-based photocatalysts, plasmonic-metal nanostructures and naturally occurring photocatalysts. Finally, we conclude with a discussion of what major advancements are needed to move the field of photocatalytic water disinfection forward.

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“…Other metal-TiO2 systems using Au, Pt and Pd have also been studied for the photocatalytic removal of microorganisms [73,74,75,76,77]. For instance, Tang and colleagues have reported the synthesis of Au/TiO2 spiky nanohybrids for the elimination of the E. coli bacteria [73].…”

Section: Non-metal-and Metal-tio2 Systemsmentioning

confidence: 99%

An approach to the photocatalytic mechanism in the TiO2-nanomaterials microorganism interface for the control of infectious processes

Rodríguez-González

Obregón

Patrón-Soberano

et al. 2020

Applied Catalysis B: Environmental

148

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J o u r n a l P r e -p r o o f 2 Graphical Abstract Highlights  Photoactive TiO2 nanomaterials can solve the actual microbial infectious defies  The microbial cell/TiO2 surface approach is key to get the photo-kill mechanism  Microbial preparation requires a reproducible protocol for proper characterization  Advanced surface characterization techniques can unravel the photo-kill mechanism  Generation of ROS, physical injuries and biocidal features confirm the annihilation J o u r n a l P r e -p r o o f Abstract The approach of this timely review considers the current literature that is focused on the interface nanostructure/cell-wall microorganism to understand the annihilation mechanism. Morphological studies use optical and electronic microscopes to determine the physical damage on the cell-wall and the possible cell lysis that confirms the viability and microorganism death. The key parameters of the tailoring the surface of the photoactive nanostructures such as the metal functionalization with bacteriostatic properties, hydrophilicity, textural porosity, morphology and the formation of heterojunction systems, can achieve the effective eradication of the microorganisms under natural conditions, ranging from practical to applications in environment, agriculture, and so on. However, to our knowledge, a comprehensive review of the microorganism/nanomaterial interface approach has rarely been conducted. The final remarks point the ideal photocatalytic way for the effective prevention/eradication of microorganisms, considering the resistance that the microorganism could develop without the appropriate regulatory aspects for human and ecosystem safety. Introduction and background 1. TiO 2 based materials obtained from TiO 2 and its composites J o u r n a l P r e -p r o o f previous studies have demonstrated that photocatalysis can be considered a promising tool in anticancer therapies, since the photocatalyst can kill cancer cells such as HeLa cells, which cause cervical cancer [7]. The energy absorbed by the photocatalyst comprises the range of ultraviolet and/or visible light, even natural sunlight. When the photocatalyst absorbs light, if the energy of the photons is enough to excite the electrons J o u r n a l P r e -p r o o f 6in the valence band (VB), then they migrate to a higher energy level in the conduction band (CB) of the material, as it is illustrated in Fig. 1. This phenomenon generates the charge carriers known as hole-electron pairs. The photogenerated hole can migrate to the surface of the material and react with water molecules or hydroxyl ions to produce hydroxyl radicals, while the photoexcited electron in the conduction band can react with the adsorbed molecular oxygen to produce superoxide ions [8]. Since the report of Fujishima and Honda about the water splitting process using a TiO2 electrode under UV irradiation, numerous studies have exploited the photoactive properties of this material [9,10]. Several reviews have studied the relationship between the electronic properties of TiO2 with...

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Catalytic inactivation of bacteria using Pd-modified titania

Cited by 23 publications

References 37 publications

Removal of microorganisms and their chemical metabolites from water using semiconductor photocatalysis

Removal of microorganisms and their chemical metabolites from water using semiconductor photocatalysis

Photocatalysts for Solar-Induced Water Disinfection: New Developments and Opportunities

An approach to the photocatalytic mechanism in the TiO2-nanomaterials microorganism interface for the control of infectious processes

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