Effect of pH and irradiation time on TiO2-chitosan activity for phenol photo-degradation

Wardhani, Sri; Purwonugroho, Danar; Fitri, Cholidatul Widya; Prananto, Yuniar Ponco

doi:10.1063/1.5062759

Cited by 13 publications

(6 citation statements)

References 8 publications

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“…We further benchmarked our results with similar plasmonic photocatalysts and plotted the degradation time to reach maximum transparency (apparent C / C 0 = 0) in Figure a. We included several reports based on sputtered TiO 2 films decorated with metal nanoparticles. ,, We also added results from metal-doped TiO 2 nanoparticle films fabricated by sol–gel methods − and TiO 2 layers without metals . In the interest of fair comparison and to illustrate the complexity of making fair comparisons between vastly different approaches to photocatalysis and diversity in results reporting and presentation, we have also included (Figure b) a table with the values of the apparent rate constant k reported in the studies referenced in Table and Figure a.…”

Section: Resultsmentioning

confidence: 99%

“… 4 , 26 , 27 We also added results from metal-doped TiO 2 nanoparticle films fabricated by sol–gel methods 28 − 31 and TiO 2 layers without metals. 32 In the interest of fair comparison and to illustrate the complexity of making fair comparisons between vastly different approaches to photocatalysis and diversity in results reporting and presentation, we have also included ( Figure 5 b) a table with the values of the apparent rate constant k reported in the studies referenced in Table 1 and Figure 5 a. Although the shortest times and highest values of k were achieved with TiO 2 /metallic nanoparticles, there is still the open question of environmental exposure of nanoparticles.…”

Section: Resultsmentioning

confidence: 99%

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Combined Structural and Plasmonic Enhancement of Nanometer-Thin Film Photocatalysis for Solar-Driven Wastewater Treatment

Daskalova

Flores

Plachetka

et al. 2023

ACS Appl. Nano Mater.

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Titanium dioxide (TiO 2 ) thin films are commonly used as photocatalytic materials. Here, we enhance the photocatalytic activity of devices based on titanium dioxide (TiO 2 ) by combining nanostructured glass substrates with metallic plasmonic nanostructures. We achieve a three-fold increase of the catalyst's surface area through nanoscale, three-dimensional patterning of periodic, conical grids, which creates a broadband optical absorber. The addition of aluminum and gold activates the structures plasmonically and increases the optical absorption in the TiO 2 films to above 70% in the visible and NIR spectral range. We demonstrate the resulting enhancement of the photocatalytic activity with organic dye degradation tests under different light sources. Furthermore, the pharmaceutical drug Carbamazepine, a common water pollutant, is reduced in the aqueous solution by up to 48% in 360 min. Our approach is scalable and potentially enables future solar-driven wastewater treatment.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Combined Structural and Plasmonic Enhancement of Nanometer-Thin Film Photocatalysis for Solar-Driven Wastewater Treatment

Daskalova

Flores

Plachetka

et al. 2023

ACS Appl. Nano Mater.

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“…7, increasing the pH from 5.39 to 8.98 significantly improved the elimination of CV dye from the aqueous solution. According to the literature, the rate of CV photodegradation typically increases as pH rises [23,24]. The photocatalyst, iron oxide nanoparticles with negative charges, became more accessible to the cationic CV dye molecules in the solution as the pH increased from 5.39 to 8.98, allowing for the formation of more hydroxyl radicals.…”

Section: Effect Of Initial Concentration Of Crystal Violetmentioning

confidence: 99%

“…The highest CV removal was 96.21 % after 90 mins of irradiation time, whereas the lowest percentage removal was 51.62 % at 30 mins. Wardhani et al [24] explained that the amount of time exposed to UV radiation was proportional to the percentage elimination of CV dye. As more hydroxyl radicals were produced, the photodegradation efficiency increased until it reached an equilibrium level.…”

Section: Effect Of Initial Concentration Of Crystal Violetmentioning

confidence: 99%

Iron oxide nanoparticles derived from Chlorella vulgaris extract: Characterization and crystal violet photodegradation studies

Kiew

Fauzi

Firdiani

et al. 2023

PROGEE

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Nanoparticles were first used a century ago, but have recently gained popularity due to their ease of use, eco-friendliness, pollution-free nature, nontoxicity and low cost for wastewater treatment applications. In terms of nanoparticles preparation, green synthesis is a more convenient, economical, quick, and environmentally friendly process than traditional synthesis (i.e. chemical and mechanical) methods. The objective of this study was to synthesise iron oxide nanoparticles from iron (III) chloride using microalgae (Chlorella vulgaris) extract for photodegradation of crystal violet (CV) dye. Various characterization methods such as X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), and Fourier-transform infrared spectroscopy (FTIR) were used to examine properties of the nanoparticles including its crystallinity, morphologies and sizes, and functional groups, respectively. The CV photodegradation process was carried out under different process conditions included initial CV concentration (10 mg/L – 25 mg/L), CV solution pH (5.39 – 8.98), and irradiation period (30 – 90 mins) to investigate the optimum operating conditions for the CV removal. The analysis using FESEM demonstrated that the nanoparticles exhibited irregularities and cylindrical shapes, measuring 109 nm in size. Meanwhile, the XRD analysis indicated that the iron oxide nanoparticles possessed a tetragonal crystal structure. The presence of Fe-O stretching vibrations at 486 cm-1 was confirmed by the FTIR spectrum. In terms of CV photodegradation studies, the optimum operating conditions for CV removal using iron oxide nanoparticles were determined to be at initial CV concentration of 10 mg/L, solution pH of 8.98, and an irradiation period of 90 mins, with a percentage removal of 96.21 %.

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“…The contact between photon and C,N-codoped TiO2 increases at a longer time, leading more number of radical actives species production, which improves diazinon degradation [30,46]. In addition, reactive species and pesticides react perfectly with increasing irradiation time [47].…”

Section: The Effect Of Irradiation Time On Diazinon Degradationmentioning

confidence: 99%

Photocatalytic Degradation of Commercial Diazinon Pesticide Using C,N-codoped TiO<sub>2</sub> as Photocatalyst

et al. 2020

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Diazinon (C12H21N2O3PS) is an effective pest controller that has been frequently used by farmers in agriculture. It is a nonspecific and highly toxic pesticide having low persistence in the environment and categorized as moderately hazardous class II. The degradation of commercial diazinon in aqueous solution was investigated by photocatalysis using low-energy activated C,N-codoped TiO2 as catalyst under visible-light. The influence of some parameters, i.e., catalyst concentration, the initial concentration of diazinon, initial pH of diazinon, and irradiation time on the diazinon degradation was studied. The amount of diazinon degradation was strongly influenced by all the above parameters. The results show that titania-modified enhanced the degradation percentage of diazinon, from 44.08% without a catalyst to 86.93% by adding 12 mg C,N-codoped TiO2 catalyst after 30 minutes visible-light irradiation. UV-visible spectrophotometer, HPLC, and COD analysis verified that diazinon was successfully degraded under photocatalysis visible.

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Effect of pH and irradiation time on TiO2-chitosan activity for phenol photo-degradation

Cited by 13 publications

References 8 publications

Combined Structural and Plasmonic Enhancement of Nanometer-Thin Film Photocatalysis for Solar-Driven Wastewater Treatment

Combined Structural and Plasmonic Enhancement of Nanometer-Thin Film Photocatalysis for Solar-Driven Wastewater Treatment

Iron oxide nanoparticles derived from Chlorella vulgaris extract: Characterization and crystal violet photodegradation studies

Photocatalytic Degradation of Commercial Diazinon Pesticide Using C,N-codoped TiO<sub>2</sub> as Photocatalyst

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