Environmentally friendly photoactive heterojunction zinc tin oxide nanoparticles

Ivetić, Tamara; Finčur, Nina; Abramović, Biljana F.; Dimitrievska, Mirjana; Štrbac, G.R.; Čajko, Kristina O.; Miljević, Bojan; Đačanin, Lj.R.; Lukić-Petrović, S.R.

doi:10.1016/j.ceramint.2015.10.169

Cited by 19 publications

(17 citation statements)

References 39 publications

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“…All samples with photocatalyst were filtered through a Millipore (Millex-GV, Burlington, MA, USA, 0.22 μm) membrane filter in order to separate the catalyst particles. Prepared aliquots were analyzed on UFLC-DAD as described previously [ 20 ]. pH was measured using a combined glass electrode (pH-Electrode SenTix 20, WTW, Thermo Fisher Scientific, Waltham, MA, USA) connected to a pH meter (pH/Cond 340i, WTW).…”

Section: Methodsmentioning

confidence: 99%

Environmental Photocatalytic Degradation of Antidepressants with Solar Radiation: Kinetics, Mineralization, and Toxicity

et al. 2021

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This work is focused on the kinetics, mineralization, and toxicological assessments of the antidepressant drug amitriptyline hydrochloride (AMI) in UV or solar illuminated aqueous suspensions of ZnO, TiO2 Degussa P25, and TiO2 Hombikat. ZnO was proven to be the most effective photocatalyst, and it was used for all further experiments under solar irradiation. The highest reaction rate was observed at 1.0 mg/mL of catalyst loading. In the investigated initial concentration range (0.0075–0.3000 mmol/L), the degradation rate of AMI increased with the increase of initial concentration in the investigated range. The effects of H2O2, (NH4)2S2O8, and KBrO3, acting as electron acceptors, along with molecular oxygen were also studied. By studying the effects of ethanol and NaI as a hydroxyl radical and hole scavenger, respectively, it was shown that the heterogeneous catalysis takes place mainly via free hydroxyl radicals. In the mineralization study, AMI photocatalytic degradation resulted in ~30% of total organic carbon (TOC) decrease after 240 min of irradiation; acetate and formate were produced as the organic intermediates; NH4+, NO3−, NO2− ions were detected as nitrogen byproducts. Toxicity assessment using different mammalian cell lines, showed that H-4-II-E was the most sensitive one.

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Section: Methodsmentioning

confidence: 99%

Environmental Photocatalytic Degradation of Antidepressants with Solar Radiation: Kinetics, Mineralization, and Toxicity

et al. 2021

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“…Starting precursors (anatase TiO 2 and MoO 3 , Sigma-Aldrich, St. Louis, MO, USA, purity 99.7%) are wet-milled by using the ball mill Retsch PM100, Haan, Germany in ethanol for 4 h, then dried in air for 24 h, annealed at 700 • C for 4 h, and finally were grind by using ceramic mortar and pestle for 10 min. The synthesis conditions are chosen from the previous works and results on similar heterojunction material systems [41][42][43]. X-ray diffraction (XRD) is carried out using a Philips PW 1050 instrument, Amsterdam, Netherlands with Cu K α1,2 radiation, and a step scan mode of 0.02 • /s in angular range 2θ = 10-70 • , which enabled good profile fitting by using the Whole Powder Pattern Fitting (WPPF) Rietveld method.…”

Section: Catalysts Preparation and Characterizationmentioning

confidence: 99%

“…Appropriate aliquots were then taken and transferred into the vials for the UFLC-DAD analysis. The conditions in which the analysis was performed have been shown by Finčur et al [45] for TEM measurements, by Armaković et al [11] for MET analysis, by Ivetić et al [41] for AMI, by Ðačanin Far et al [25] for CIP, and by Abramović et al [46] for CEF measurements. Besides, conditions for QUI analysis were as follows: the mobile phase (flow rate 1.0 cm 3 /min) was a mixture of acetonitrile and 0.1% aqueous H 3 PO 4 (5:5, v/v), and the UV/Vis DAD detector was set at 224 nm (wavelength of QUI maximum absorption).…”

Section: Measurements Of Photocatalytic Activitymentioning

confidence: 99%

Water-Active Titanium/Molybdenum/Mixed-Oxides: Removal Efficiency of Organic Water Pollutants by Adsorption and Photocatalysis and Toxicity Assessment

et al. 2021

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A new titanium/molybdenum/mixed-oxides (TMO) contact-type heterojunction photocatalyst was prepared by a simple, low-cost, and environmentally-friendly mixing-calcination solid-state method. A microstructural investigation by scanning electron microscopy (SEM) showsirregularly shaped agglomerated morphology of TMO that consists of firmly connected globular TiO2 and rod-like MoO3 particles. The detailed structure and optical bandgap investigation by X-ray diffraction, Raman, and UV-Vis spectroscopy revealed the TMO’s composition of ~37 wt.% rutile TiO2, ~25 wt.% of anatase TiO2, and ~38 wt.% of molybdite MoO3 phase and an absorption threshold of around 380 nm, which implies more probability of desirable higher visible light absorption. The removal efficiency of pesticides quinmerac (QUI) and tembotrione (TEM), and pharmaceuticals metoprolol (MET), amitriptyline (AMI), ciprofloxacin (CIP),and ceftriaxone (CEF) from water in the presence of starting pure TiO2, MoO3, and prepared TMO were investigated under different pH values and UV irradiation/simulated sunlight (SS). Each starting metal-oxide precursors and prepared TMO showed a different affinity for adsorption of tested pesticides and pharmaceuticals, and, in general, better photocatalytic degradation efficiency under UV irradiation than under simulated sunlight. The highest photocatalytic degradation efficiency under UV irradiation was 81.6% for TEM using TMO; using TiO2 was 65.0% for AMI, and using MoO3 was 79.3% for CEF after 135 min. However, TMO showed a very high synergic adsorption/photocatalytic under-SS efficiency in the removal of CIP of almost 80% and under UV irradiation of 90% CIP removal after 75 min. The toxicity of catalysts, starting compounds, and their intermediates formed during the removal process was assessed using a rat hepatoma cell line (H-4-II-E). The highest hepatotoxic effects were obtained by using UV irradiated QUI and MET suspension with TMO for up to 60 min.

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“…The photocatalytic activity mainly depends on two factors: (1) the production of photo-generated electrons (e − ) and holes (h + ); and (2) the effective separation ability of the e − /h + pairs [9,10]. The band gap of SnO 2 is 3.6 eV, so SnO 2 is only irradiated by UV light to bring about the transition of electrons from the valence band to the conduction band, hence generating holes in the valence band [11]. Furthermore, the species is very unstable, and the recombination of electrons and holes can occur quickly.…”

Section: Introductionmentioning

confidence: 99%

SnO2 Composite Films for Enhanced Photocatalytic Activities

Han

Peng

et al. 2018

Catalysts

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As a new type of promising semiconductor photocatalyst, SnO2 cannot be widely applied due to its low utilization efficiency to visible light and swift recombination of photogenerated electrons and holes. These drawbacks were effectively overcome by preparing the B/Ag/F tridoped SnO2-ZnO composite films using the simple sol–gel method. The degradation of the methyl green and formaldehyde solutions was used to value the photocatalytic activity of the samples. Photoluminescence (PL) spectra and the UV–Vis absorption spectroscopy results of the samples illustrated that the B/Ag/F tridoped SnO2-ZnO composite film not only improved the lifetime of the charge carriers, but also enhanced their visible light absorption. The X-ray diffraction (XRD) results showed that the crystalline SnO2 was in the structure of rutile. As exhibited in the BET surface area results, the specific surface area of pure SnO2 was 19.9 m2g−1, while that of the B/Ag/F tridoped SnO2-ZnO was 85.3 m2g−1. Compared to pure SnO2, SnO2-ZnO, or the mono- or di-doped SnO2-ZnO films, the B/Ag/F tridoped SnO2-ZnO composite film had the highest photocatalytic activity.

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Environmentally friendly photoactive heterojunction zinc tin oxide nanoparticles

Cited by 19 publications

References 39 publications

Environmental Photocatalytic Degradation of Antidepressants with Solar Radiation: Kinetics, Mineralization, and Toxicity

Environmental Photocatalytic Degradation of Antidepressants with Solar Radiation: Kinetics, Mineralization, and Toxicity

Water-Active Titanium/Molybdenum/Mixed-Oxides: Removal Efficiency of Organic Water Pollutants by Adsorption and Photocatalysis and Toxicity Assessment

SnO2 Composite Films for Enhanced Photocatalytic Activities

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