Solar photocatalytic degradation of caffeine with titanium dioxide and zinc oxide nanoparticles

Ghosh, Malini; Manoli, Kyriakos; Shen, Xin; Wang, Jihao; Ray, Ajay K.

doi:10.1016/j.jphotochem.2019.03.029

Cited by 53 publications

(27 citation statements)

References 43 publications

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“…Combined with environmentally friendly properties and antimicrobial efficacy, ZnO NPs are very popular among scientists who study and their photocatalytic properties (Ghosh et al 2019). Addition of zinc oxide metal and metal oxides can improve NPs photodegradation activity (Kant and Kumar 2012).…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Fe3O4/ZnO nanoparticles and their application for the photodegradation of anionic and cationic dyes

Długosz

Szostak

Krupiński

et al. 2020

Int. J. Environ. Sci. Technol.

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Multifunctional materials have become an important research subject in recent years. Zinc oxide nanoparticles (ZnO NP) deposited on iron oxide (Fe 3 O 4) allow to obtain material with photocatalytic and magnetic properties. The mass share of Fe 3 O 4 in the composite was 30%. Saturation magnetization for this sample was about 9.5 emu/g. The use of magnetic material allows to recover the photocatalyst after the photodegradation process and reuse it. The possibility of recovery of Fe 3 O 4 nanoparticles with a magnet was estimated at 94.80%, while the recovery of Fe 3 O 4 /ZnO achieved 83.91%. The effects of the type of dyes (Methylene Blue, Methyl Orange, Quinoline Yellow, Eriochromic Black T and Trypanic Blue) on their photodegradation efficiency in terms of molar mass of the dye, the solvent in which the processes were carried out and the type of dye charge were investigated. The photocatalytic material showed higher photodegradation activity of dyes while increasing their molar mass. ZnO NPs deposited on Fe 3 O 4 presented 95.61% photocatalytic efficiency against Trypan Blue and 63.02% against Methylene Blue. Increasing the surface area of the catalyst to 39 m 2 /g and the presence of micro-, meso-and macropores had a positive effect on the sorption process of dyes, especially those of larger sizes, allowing their degradation in the photodegradation process.

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Section: Introductionmentioning

confidence: 99%

Synthesis of Fe3O4/ZnO nanoparticles and their application for the photodegradation of anionic and cationic dyes

Długosz

Szostak

Krupiński

et al. 2020

Int. J. Environ. Sci. Technol.

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“…Photocatalysis takes place when semiconductors such ZnO absorbs photons of higher than its bandgap when exposed to light energy which subsequently produces an electron (e − ) – hole (h + ) pair. This generated h + acts as an oxidising agent and the electron as a reducing agent (Ghosh et al ., 2019).…”

Section: Photocatalysis Technique For the Treatment Wastewatermentioning

confidence: 99%

Photocatalysis of xenobiotic organic compounds in greywater using zinc oxide nanoparticles: a critical review

Yashni

Al‐Gheethi

Hossain

et al. 2020

Water & Environment J

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The direct discharge of raw bathroom greywater has increased the concentrations of various pollutants in the water bodies. Typically, greywater contains large quantities of xenobiotic organic compounds (XOCs) owing to an increase in consumption of personal care and bath products. Therefore, it urges for a suitable technology to eliminate these compounds from contaminated waters. Photocatalytic degradation using Zinc Oxide nanoparticles (ZnO NPs) has the potentiality to eliminate various XOCs. However, ZnO NPs have high tendency to aggregate, which may lower the photocatalytic degradation rate. Therefore, there is an urgency to modify ZnO NPs to overcome the limitation. The present review was conducted to determine a suitable method for the modification ZnO NPs. Besides, the potential of the modified ZnO NPs in degrading XOCs in greywater as a photocatalyst was also discussed.

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“…Thus, the identified isotherm shapes are the most common, two wellknown equations isotherms, i.e. Langmuir and Freundlich could be applied (Ghosh et al, 2019).…”

Section: Effect Of Sorption Timementioning

confidence: 99%

Titanium(IV) Oxide Modified with Activated Carbon and Ultrasounds for Caffeine Photodegradation: Adsorption Isotherm and Kinetics Study

Zawadzki¹,

Kudlek²,

Dudziak³

2020

J. Ecol. Eng.

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In this paper the adsorption and photodegradation of caffeine (CAF) using modified photocatalysts were studied. The laboratory synthesis method of commercial titanium(IV) oxide, activated carbon and ultrasound was proposed. The adsorption effect of caffeine was described by the Langmuir and Freundlich isotherms. The effectiveness of CAF photocatalytic decomposition was evaluated as well as the parameters of the pseudo-first-order and pseudo-second-order reaction kinetics were estimated. It was determined that the caffeine adsorption fit both the Langmuir and Freundlich isotherms. The value of the experimental maximum adsorption capacity (q e) was the highest for TiO 2 modified with activated carbon and ultrasounds (TiO 2 /AC/Us). The highest removal degree (over 99.0%) of CAF was observed for titanium(IV) oxide modified with activated carbon. Both photodegradation kinetics models show good or very good fit; however, the pseudo-first-order model shows better fit to the experimental data (R 2 = 97-99%). After 20 minutes of the photodegradation process, the following efficiency order was determined: TiO 2 < TiO 2 /AC < TiO 2 /AC/US. The results indicate that the combination of TiO 2 , activated carbon and ultrasound is an interesting alternative for the efficient degradation of caffeine, comparing to commercial TiO 2 .

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Solar photocatalytic degradation of caffeine with titanium dioxide and zinc oxide nanoparticles

Cited by 53 publications

References 43 publications

Synthesis of Fe3O4/ZnO nanoparticles and their application for the photodegradation of anionic and cationic dyes

Synthesis of Fe3O4/ZnO nanoparticles and their application for the photodegradation of anionic and cationic dyes

Photocatalysis of xenobiotic organic compounds in greywater using zinc oxide nanoparticles: a critical review

Titanium(IV) Oxide Modified with Activated Carbon and Ultrasounds for Caffeine Photodegradation: Adsorption Isotherm and Kinetics Study

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