Application of the colloidal stability of TiO2 particles for recovery and reuse in solar photocatalysis

Fernández‐Ibáñez, Pilar; Blanco, J.; Malato, Sixto; Nieves, F. J. de las

doi:10.1016/s0043-1354(03)00157-x

Cited by 221 publications

(102 citation statements)

References 28 publications

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“…These reactive species are powerfully oxidative and can destroy the structure of various organic molecules, therefore, having found extensive applications in the removal of infectious molecules and organic pollutants. TiO 2 nanoparticles also have been regarded as a potential photosensitizing agent for photodynamic therapy (PDT) [2][3][4][5]. The ROS generated from the photoexcited TiO 2 nanoparticles can react with cell membranes and cell interiors, leading to toxic responses and/or death of cells [6].…”

Section: Introductionmentioning

confidence: 99%

Controlling silica coating thickness on TiO2 nanoparticles for effective photodynamic therapy

Feng

Zhang

Lou

2013

Colloids and Surfaces B: Biointerfaces

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Highlights Core-shell structured TiO 2 -SiO 2 nanoparticles of varying shell thickness were synthesized as photo-killing agents.  The effect of the silica shell thickness on the photoreactivity, cytotoxicity, haemocompatibility and photo-killing ability of the TiO 2 nanoparticles was investigated.  Strong photo-killing effect and enhanced cytocompatibility were achieved by controlling the silica shell thickness to 5.5 nm. nanoparticles, but also demonstrated an improved cell compatibility and effective photokilling ability upon the mouse fibroblast cells (L929). *Highlights (for review)

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Section: Introductionmentioning

confidence: 99%

Controlling silica coating thickness on TiO2 nanoparticles for effective photodynamic therapy

Feng

Zhang

Lou

2013

Colloids and Surfaces B: Biointerfaces

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“…Guillard et al (2005) have shown that the decrease in efficiency of TiO2 photocatalysis in the presence of inorganic ions at neutral pH conditions is mainly caused by the formation of an inorganic layer at the catalyst surface, inhibiting the contaminant adsorption. Under the tested pH value, and according to Fig.1b, c, the AMX species in solution may present overall neutral (48.5 % as H2AMX) or negative charges (49.7 % as HAMX − ), and the surface of TiO2 particles is neutral and negatively charged (76 % as -TiOH and 24 % as -TiO − ;pH> pHPZC, pH of point of zero charge= 6.7; Fernández-Ibáñez et al 2003;Malato et al 2009). According to Dimitrakopoulou et al (2012), this does not favor an electro-static attraction between AMX and TiO2, and leads to the minimal amount of antibiotic adsorption in the dark, as it can be seen in Fig.…”

Section: Influence Of Inorganic Ions and Scavengersmentioning

confidence: 91%

Assessment of solar driven TiO2-assisted photocatalysis efficiency on amoxicillin degradation

Pereira

Reis

Nunes

et al. 2013

Environ Sci Pollut Res

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The objective of this work was to evaluate the efficiency of a solar TiO2-assisted photocatalytic process on amoxicillin (AMX) degradation, an antibiotic widely used in human and veterinary medicine. Firstly, solar photolysis of AMX was compared with solar photocatalysis in a compound parabolic collectors pilot scale photoreactor to assess the amount of accumulated UV energy in the system (QUV) necessary to remove 20 mg L −1 AMX from aqueous solution and mineralize the intermediary byproducts. Another experiment was also carried out to accurately follow the antibacterial activity against Escherichia coli DSM 1103 and Staphylococcus aureus DSM 1104 and mineralization of AMX by tracing the contents of dissolved organic carbon (DOC), low molecular weight carboxylate anions, and inorganic anions. Finally, the influence of individual inorganic ions on AMX photocatalytic degradation efficiency and the involvement of some reactive oxygen species were also assessed. Photolysis was shown to be completely ineffective, while only 3.1 kJUVL −1 was sufficient to fully degrade 20 mg L −1 AMX and remove 61 % of initial DOC content in the presence of the photocatalyst and sunlight. In the experiment with an initial AMX concentration of 2 40 mg L −1 , antibacterial activity of the solution was considerably reduced after elimination of AMX to levels below the respective detection limit. After 11.7 kJUVL −1 , DOC decreased by 71 %; 30 % of the AMX nitrogen was converted into ammonium and all sulfur compounds were converted into sulfate. A large percentage of the remaining DOC was in the form of low molecular weight carboxylic acids. Presence of phosphate ions promoted the removal of AMX from solution, while no sizeable effects on the kinetics were found for other inorganic ions. Although the AMX degradation was mainly attributed to hydroxyl radicals, singlet oxygen also plays an important role in AMX self-photosensitization under UV/ visible solar light.

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“…This separation process is crucial to avoid the loss of catalyst particles and introduction of the new pollutant of contami-nation of TiO2 in the treated water [37]. The catalyst recovery can be achieved through process hybridization with conventional sedimentation [38], cross-flow filtration [39] or various membrane filtrations [40].…”

Section: Photocatalysismentioning

confidence: 99%

Treatment Technologies for Organic Wastewater

Zheng¹,

Zhao²,

Zhou³

et al. 2013

Water Treatment

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Application of the colloidal stability of TiO2 particles for recovery and reuse in solar photocatalysis

Cited by 221 publications

References 28 publications

Controlling silica coating thickness on TiO2 nanoparticles for effective photodynamic therapy

Controlling silica coating thickness on TiO2 nanoparticles for effective photodynamic therapy

Assessment of solar driven TiO2-assisted photocatalysis efficiency on amoxicillin degradation

Treatment Technologies for Organic Wastewater

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