One-pot hydrothermal synthesis of g-C3N4/Ag/AgCl/BiVO4 micro-flower composite for the visible light degradation of ibuprofen

Akbarzadeh, Rokhsareh; Fung, Christopher S.L.; Rather, Rayees Ahmad; Lo, Irene Man Chi

doi:10.1016/j.cej.2018.02.042

Cited by 99 publications

(25 citation statements)

References 43 publications

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“…Equations 4-9 give the mechanism of formation of these reactive species and their oxidation reactions with the pharmaceutical molecules for total mineralization. The contribution of individual reactive specie in the PEC degradation of the ciprofloxacin molecule was determined by trapping experiments which was conducted by inhibiting the effects of holes, hydroxyl radicals and superoxide radicals through the introductions of ethylenediaminetetraacetate salt (EDTA), t-butanol (t-BuOH) and p-benzoquinone (p-BZQ) respectively 56,57 in the reaction medium. As seen in Fig.…”

Section: Resultsmentioning

confidence: 99%

Towards visible light driven photoelectrocatalysis for water treatment: Application of a FTO/BiVO4/Ag2S heterojunction anode for the removal of emerging pharmaceutical pollutants

Orimolade

Arotiba

2020

Sci Rep

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Pharmaceuticals have been classified as emerging water pollutants which are recalcitrant in nature. In the quest to find a suitable technique in removing them from contaminated water, photoelectrocatalytic oxidation method has attracted much attention in recent years. this report examined the feasibility of degrading ciprofloxacin and sulfamethoxazole through photoelectrocatalytic oxidation using fto-BiVo 4 /Ag 2 S with p-n heterojunction as anode. BiVo 4 /Ag 2 S was prepared through electrodeposition and successive ionic layer adsorption/reaction on fto glass. Structural and morphological studies using XRD, SEM, EDS and diffusive reflectance UV-Vis confirmed the successful construction of p-n heterojunction of BiVo 4 /Ag 2 S. electrochemical techniques were used to investigate enhanced charge separation in the binary electrode. the fto-BiVo 4 /Ag 2 S electrode exhibited the highest photocurrent response (1.194 mA/cm −2 ) and longest electron lifetime (0.40 ms) than both pristine BiVo 4 and Ag 2 S electrodes which confirmed the reduction in recombination of charge carriers in the electrode. Upon application of the prepared FTO-BiVO 4 /Ag 2 S in photoelectrocatalytic removal of ciprofloxacin and sulfamethoxazole, percentage removal of 80% and 86% were achieved respectively with a low bias potential of 1.2 V (vs Ag/AgCl) within 120 min. The electrode possesses good stability and reusability. the results obtained revealed BiVo 4 /Ag 2 S as a suitable photoanode for removing recalcitrant pharmaceutical molecules in water. open Scientific RepoRtS | (2020) 10:5348 | https://doi.org/10.1038/s41598-020-62425-w www.nature.com/scientificreports www.nature.com/scientificreports/ Scientific RepoRtS | (2020) 10:5348 | https://doi.org/10.1038/s41598-020-62425-wwww.nature.com/scientificreports www.nature.com/scientificreports/ the BiOI electrode. The electrode was subsequently placed in a furnace at 420 °C for 1 h. Finally, excess V 2 O 5 was washed off from the electrode by soaking it in 1.0 M NaOH solution for 40 min. The resulting BiVO 4 /FTO electrode was thoroughly washed with deionized water and dried at room temperature. In order to obtain BiVO 4 / Ag 2 S electrode, the prepared FTO/BiVO 4 was dipped in a 0.3 M AgNO 3 solution for 10 s and followed by immersion in 0.3 M Na 2 S for 10 s. The cycle was repeated ten times and the obtained electrode was rinsed with deionized water and air dried at room temperature for 24 h. Scientific RepoRtS |(2020) 10:5348 | https://doi.org/10.1038/s41598-020-62425-w www.nature.com/scientificreports www.nature.com/scientificreports/ conclusion A photoanode of BiVO 4 /Ag 2 S with p-n heterojunction was successful prepared through electrodeposition and successive ionic layer adsorption/reaction method on FTO glass. The construction of p-n heterojunction reduced the common problem of rapid recombination of photogenerated electron-hole pairs. This was confirmed through the photocurrent response of BiVO 4 /Ag 2 S (1.194 mA/cm −2 ) which was higher than both pristine BiVO 4 (0.802 mA/cm −2 ) and...

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Section: Resultsmentioning

confidence: 99%

Towards visible light driven photoelectrocatalysis for water treatment: Application of a FTO/BiVO4/Ag2S heterojunction anode for the removal of emerging pharmaceutical pollutants

Orimolade

Arotiba

2020

Sci Rep

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“…As shown in Fig. 7b, the kinetic rate constant (k) for BiOCl/GO/MOF-5, BiOCl + GO + MOF-5, BiOCl/GO, BiOCl and MOF-5 was equal to 0.01651, 0.00905, 0.00798, 0.00365 and 6.158 × 10 −4 min −1 , respectively, where k is the pseudo-first-order rate constant by calculating the kinetic rate constant from ln(C 0 /C t ) versus t. [27] The k value of BiOCl/GO/MOF-5 is about 4.5 times higher than pure BiOCl. Additionally, the great improvement of the catalytic efficiency is mainly attributed to the layered structure and suitable bandgap of the composite material could be to promote the electrons and holes separation and to increase the contact probability between the catalyst and the dye molecule [28].…”

Section: Resultsmentioning

confidence: 99%

Two‐dimensional composite (BiOCl/GO/MOF‐5) by ultrasonic‐assisted solvothermal synthesis with enhanced photocatalytic activity

Zhai

Chen

et al. 2020

Micro & Nano Letters

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In this work, a novel two-dimensional photocatalyst (BiOCl/GO/MOF-5) was successfully developed by ultrasonic-assisted solvothermal method. X-ray diffraction, scanning electron microscope, Brunauer-Emmett-Teller, UV-visible diffuse reflectance spectrum, photoluminescence and NH 3-TPD were employed to characterise its unique structure and property. The results show that the specific surface area of the two-dimensional composite (205.1 mg 2 •g −1) is significantly higher than single BiOCl (3.14 mg 2 •g −1), which provide much more active site for the photocatalystic process. Also the photocatalytic efficiency could reach to 90.6% that is much higher than pure BiOCl. This could be attributed to the effective electrons-holes separations and proper bandgap to enhance photocatalytic performance. At the same time, the formation mechanism and the possible photocatalytic mechanism of photocatalyst were proposed.

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“…For pure BiOCOOH, all the diffraction peaks coincided well with those of the tetragonal BiOCOOH (JCPDS 35-0939) [11,15]. Pristine AgCl was crystalized in a cubic phase (JCPDS 31-1238) with distinct diffraction peaks at 27.8°, 32.4°, 46.3°, 54.6°, 57.3°, and 74.5°, corresponding to the (111), (200), (220), (311), (222), and (331) crystal facets, respectively [23,28]. As to the Ag/AgCl/BiOCOOH heterojunctions, besides the peaks from BiOCOOH, several diffraction peaks belonging to Ag and AgCl were also detected, proving the successful fabrication of Ag/AgCl/BiOCOOH heterojunctions.…”

Section: Resultsmentioning

confidence: 99%

A Novel Flower-Like Ag/AgCl/BiOCOOH Ternary Heterojunction Photocatalyst: Facile Construction and Its Superior Photocatalytic Performance for the Removal of Toxic Pollutants

Xue

Wu³

et al. 2019

Nanomaterials

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Novel 3D flower-like Ag/AgCl/BiOCOOH ternary heterojunction photocatalysts were fabricated by the solvothermal and in-situ precipitation methods, followed by light reduction treatment. The Ag/AgCl nanoparticles were homogeneously distributed on 3D BiOCOOH microspheres. These obtained catalysts were characterized by XRD, SEM, TEM, diffuse reflectance spectra (DRS), and photoluminescence (PL). As expected, they exhibited extraordinary photocatalytic capabilities for the elimination of rhodamine B (RhB) and ciprofloxacin (CIP) under simulated sunlight, the results revealed that the Ag/AgCl/BiOCH-3 with 20 wt.% of Ag/AgCl possessed the maximum activity, and the rate constant for the RhB degradation reached up to 0.1353 min−1, which was about 16.5 or 12.2 times that of bare BiOCOOH or Ag/AgCl. The PL characterization further verified that Ag/AgCl/BiOCOOH heterojunctions were endowed with the effective separation of photogenerated carriers. The excellent photocatalytic ability of Ag/AgCl/BiOCOOH could be credited to the synergistic interactions between Ag/AgCl and BiOCOOH, which not only substantially widened the light absorption, but also evidently hindered the charge recombination. The trapping experiments revealed that the dominant reactive species in RhB removal were h+, •OH, and •O2− species. In addition, Ag/AgCl/BiOCOOH was quite stable and easily recyclable after multiple cycles. The above results imply that the 3D flower-like Ag/AgCl/BiOCOOH ternary heterojunction photocatalyst holds promising prospects in treating industrial wastewater.

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One-pot hydrothermal synthesis of g-C3N4/Ag/AgCl/BiVO4 micro-flower composite for the visible light degradation of ibuprofen

Cited by 99 publications

References 43 publications

Towards visible light driven photoelectrocatalysis for water treatment: Application of a FTO/BiVO4/Ag2S heterojunction anode for the removal of emerging pharmaceutical pollutants

Towards visible light driven photoelectrocatalysis for water treatment: Application of a FTO/BiVO4/Ag2S heterojunction anode for the removal of emerging pharmaceutical pollutants

Two‐dimensional composite (BiOCl/GO/MOF‐5) by ultrasonic‐assisted solvothermal synthesis with enhanced photocatalytic activity

A Novel Flower-Like Ag/AgCl/BiOCOOH Ternary Heterojunction Photocatalyst: Facile Construction and Its Superior Photocatalytic Performance for the Removal of Toxic Pollutants

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