Photocatalytic degradation of organic dyes in the presence of nanostructured titanium dioxide

Kiwaan, Hala A.; Atwee, T.; Azab, E.A.; El-Bindary, A.A.

doi:10.1016/j.molstruc.2019.127115

Cited by 170 publications

(62 citation statements)

References 57 publications

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“…The homogenous solution of ZnO NRs and MB was transferred to a photoreactor quartz tube retained in a photoreactor with a continuous stirrer. The photo‐degradation was analyzed at 365 nm and the degradation activity was monitored and calculated at 10‐min intervals . Untreated MB solution was used as a control and the MB degradation was calculated using the kinetics equation

\ln ((), normala . normalu . / normala . normalu ._{0}) = - italickt

where the a.u.…”

Section: Methodsmentioning

confidence: 99%

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Eco‐friendly synthesis of ZnO nanorods using Cycas pschannae plant extract with excellent photocatalytic, antioxidant, and anticancer nanomedicine for lung cancer treatment

Sudha¹,

Ali²,

Karunakaran

et al. 2020

Applied Organom Chemis

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The tunable ZnO nanorods (NRs) are produced due to the phytochemicals present in Cycas pschannae leaves which act as reducing and stabilizing agents. The confirmations of the ZnO NRs were validated using different characterization techniques: X‐ray diffraction, Fourier transform infrared spectroscopy, Brunauer, Emmett and Teller (BET), scanning electron microscopy–Energy Dispersive X‐Ray Analysis (EDX), UV–visible spectroscopy, Raman spectroscopy, and transmission electron microscopy. The ZnO NRs show unique surface area and low particle size. Photocatalytic activity was measured and found to be 50.75% at low concentrations and 78.33% at high concentrations. The antioxidant activity of the ZnO NRs also showed promising results for their use in free radical scavenging. In vitro toxicity studies using zebrafish embryos was performed to evaluate the toxic nature of it and the obtained result confirmed its non‐toxic nature. In addition, ZnO anticancer potential was verified using the A549 lung cancer cell line. Cytotoxic assessments of ZnO NRs were performed via 2,3‐bis‐(2‐methoxy‐4‐nitro‐5‐sulfophenyl)‐2H‐tetrazolium‐5‐carboxanilide (XTT), 3‐(4,5‐dimethylthiazol‐2‐yl)‐2,5‐diphenyl tetrazolium bromide (MTT), and neutral red uptake assays to examine the cell death cycle on the A549 lung cancer cell. Dose‐dependent apoptosis and necrosis were confirmed by Lactate dehydrogenase (LDH) assay. It was also confirmed that ZnO NRs induce Reactive oxygen species (ROS) and apoptosis inside cancer (A549) cells via different intrinsic gene expression. Thus, based on this research it is evident that an effective ecofriendly, nontoxic potential anticancer drug can be synthesized using C. pschannae leaf extract.

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\ln ((), normala . normalu . / normala . normalu ._{0}) = - italickt

where the a.u.…”

Section: Methodsmentioning

confidence: 99%

“…The photo-degradation was analyzed at 365 nm and the degradation activity was monitored and calculated at 10-min intervals. [30,31] Untreated MB solution was used as a control and the MB degradation was calculated using the kinetics equation where the a.u. and a.u.…”

Section: Photocatalytic Activitymentioning

confidence: 99%

Eco‐friendly synthesis of ZnO nanorods using Cycas pschannae plant extract with excellent photocatalytic, antioxidant, and anticancer nanomedicine for lung cancer treatment

Sudha¹,

Ali²,

Karunakaran

et al. 2020

Applied Organom Chemis

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“…Based on the band edge positions of g−C 3 N 4 and Fe 2 O 3 , the photocatalytic mechanism of Fe 2 O 3 /g−C 3 N 4 ‐0.4 hybrid for TC degradation is discussed. As shown in Figure , when Fe 2 O 3 /g−C 3 N 4 ‐0.4 is irradiated by the visible light, both g−C 3 N 4 and Fe 2 O 3 can be excited and produce photo‐generated electron‐hole pairs . The CB position of g−C 3 N 4 is more negative than that of Fe 2 O 3 , and the VB position of Fe 2 O 3 is more positive than that of g−C 3 N 4 .…”

Section: Resultsmentioning

confidence: 97%

“…As shown in Figure 10, when Fe 2 O 3 /gÀ C 3 N 4 -0.4 is irradiated by the visible light, both gÀ C 3 N 4 and Fe 2 O 3 can be excited and produce photo-generated electron-hole pairs. [48,49] The CB position of gÀ C 3 N 4 is more negative than that of Fe 2 O 3 , and the VB position of Fe 2 O 3 is more positive than that of gÀ C 3 N 4 . Thus, the photogenerated electrons on surface of gÀ C 3 N 4 and the holes on surface of Fe 2 O 3 can readily transfer to the CB of Fe 2 O 3 and the VB of gÀ C 3 N 4 , respectively, and hence the recombination of photo-generated electron-hole pairs are greatly inhibited, leading to a remarkable improved photocatalytic activity.…”

Section: Resultsmentioning

confidence: 99%

α−Fe₂O₃ Nanoparticles/Porous g−C₃N₄ Hybrids Synthesized by Calcinations of Fe‐based MOF/Melamine Mixtures for Boosting Visible‐Light Photocatalytic Tetracycline Degradation

et al. 2020

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A series of α−Fe2O3 nanoparticles/porous g−C3N4 hybrids were facile synthesized by calcinations of the Fe‐based MOF/melamine mixtures with different mass ratios for boosting visible‐light (λ>420 nm) photocatalytic tetracycline degradation in water. As expected, the specially designed hybrids exhibited obviously improved photocatalytic performance for tetracycline degradation. Specifically, the photocatalytic activity of Fe2O3/g−C3N4‐0.4, an optimized hybrid, was about 2.64 times higher than that of bulk g−C3N4. The results of structure characterizations and photoelectric property tests reflected that the large surface area and strong interfacial coupling of Fe2O3/g−C3N4‐0.4 resulted in its high photocatalytic activity by providing the adequate active sites and promoting the separation and transfer of photo‐generated electron‐hole (e−‐h+) pairs. In addition, the photocatalytic mechanism of Fe2O3/g−C3N4‐0.4 was studied and the h+ was determined to be the main active specie for tetracycline degradation. This work can provide crucial theoretical guidance for developing Fe2O3/g−C3N4 hybrid catalysts toward pollutant photodegradation.

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“…High surface area of porous material provides places for the adsorption and distribution of the detected matter and increase concentration. [22][23][24][25][26][27] Recently, the researchers focusing on nanopore and porous materials, which used on the determination of ions and they do a lot of work to enhance sensitivity, responsiveness, and selectivity. This type of fast, sensitive and high selectivity towards ions can be obtained by adjusting pore diameter and the surface area of porous material.…”

Section: Introductionmentioning

confidence: 99%

Analytical Chemistry Optical Chemosensor for Spectrophotometric Determination of Nitrite in Wastewater

Abou‐Melha

2020

ChemistrySelect

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An easy, sensitive, and rapid spectrophotometric method has been documented for determining nitrite (NO 2 À ) in water and wastewater. To detect and adsorb harmful nitrite ions from wastewater efficiently; a stable optical nanosensor was manufactured by immobilization of 1-Naphthylamine (1-NA) over mesoporous silica nanospheres (MSNs). The determination of nitrite was based on the reaction of nitrite with the optical sensor (1-NA chemosensor) and forming diazonium salt which was subsequently coupled with N-(1-Naphthyl) ethylenediamine dihydrochloride (NED) to form a stable brownish azo dye. The dye shows an absorption maximum at 457 nm. The optimal conditions for the reaction and the analytical parameters were evaluated. The method has been designed by controlling the acidity, the quantity of reagents required and the amount of tolerance of certain ions. The range of linearity was found to be 0.108-10.8 μM of nitrite. The nitrite identification detection limit and quantitation limit are 0.106 μM and 0.353 μM, respectively. The performance of the chemosensor in extracting the NO 2 À ions was tested. According to the Langmuir isotherms, the adsorption pattern was highly competent, where the removal capacity for NO 2 À ion was 156.0 mg/g by the chemosensor. Some cations and anions have been identified as the competing ions; these ions were not affected on the NO 2 À ion in both detection and adsorption processes.[a] Prof.

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Photocatalytic degradation of organic dyes in the presence of nanostructured titanium dioxide

Cited by 170 publications

References 57 publications

Eco‐friendly synthesis of ZnO nanorods using Cycas pschannae plant extract with excellent photocatalytic, antioxidant, and anticancer nanomedicine for lung cancer treatment

Eco‐friendly synthesis of ZnO nanorods using Cycas pschannae plant extract with excellent photocatalytic, antioxidant, and anticancer nanomedicine for lung cancer treatment

α−Fe₂O₃ Nanoparticles/Porous g−C₃N₄ Hybrids Synthesized by Calcinations of Fe‐based MOF/Melamine Mixtures for Boosting Visible‐Light Photocatalytic Tetracycline Degradation

Analytical Chemistry Optical Chemosensor for Spectrophotometric Determination of Nitrite in Wastewater

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Photocatalytic degradation of organic dyes in the presence of nanostructured titanium dioxide

Cited by 170 publications

References 57 publications

Eco‐friendly synthesis of ZnO nanorods using Cycas pschannae plant extract with excellent photocatalytic, antioxidant, and anticancer nanomedicine for lung cancer treatment

Eco‐friendly synthesis of ZnO nanorods using Cycas pschannae plant extract with excellent photocatalytic, antioxidant, and anticancer nanomedicine for lung cancer treatment

α−Fe2O3 Nanoparticles/Porous g−C3N4 Hybrids Synthesized by Calcinations of Fe‐based MOF/Melamine Mixtures for Boosting Visible‐Light Photocatalytic Tetracycline Degradation

Analytical Chemistry Optical Chemosensor for Spectrophotometric Determination of Nitrite in Wastewater

Contact Info

Product

Resources

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α−Fe₂O₃ Nanoparticles/Porous g−C₃N₄ Hybrids Synthesized by Calcinations of Fe‐based MOF/Melamine Mixtures for Boosting Visible‐Light Photocatalytic Tetracycline Degradation