Fabrication of Ag-doped ZnO by mechanochemical combustion method and their application into photocatalytic Famotidine degradation

Molla, Md. Ashraful Islam; Furukawa, Mai; Tateishi, Ikki; Katsumata, Hideyuki; Kaneco, Satoshi

doi:10.1080/10934529.2019.1608793

Cited by 24 publications

(21 citation statements)

References 37 publications

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“…Table 1 summarizes the BET surface area of TiO 2 , ZnO, and B−ZnO/TiO 2 photocatalysts. The BET surface areas of ZnO and TiO 2 are 7.30 and 10.76 m 2 /g, respectively, whereas B−ZnO/TiO 2 has a surface area of 18.99 m 2 /g, which is consistent with previous findings [35]. Interestingly, B−ZnO/TiO 2 exhibits a higher BET surface area than bare ZnO and TiO 2 .…”

Section: Bet Studysupporting

confidence: 90%

“…Figure 7d shows the binding energy peak of B1s at 192.3 eV, showing that the doping B atoms are in the trivalent state of B 3+ [9,23]. Furthermore, the O1s XPS spectra of B−ZnO/TiO 2 (Figure 7e) reveal that the peak at 529.9 eV is attributable to the lattice oxygen anions (O 2− ) [23,35]. The peak at 531.2 eV relates to weakly bound oxygen species such C−O and C=O groups, whereas the peak at 532.2 eV indicates the presence of OH groups on the nanocomposite surface [20,23].…”

Section: Xps Studymentioning

confidence: 96%

“…The following Equations ( 3) and ( 4) were used to compute the conduction band (CB) and valence band (VB) of ZnO and TiO 2 [35].…”

Section: Photocatalytic Degradation Mechanismmentioning

confidence: 99%

“…The reusability of the used B-ZnO/TiO 2 photocatalyst was investigated up to five cycles at the optimal conditions (initial MB concentration: 15 mg/L; photocatalyst amount: 30 mg; pH: 11; irradiation time: 15 min), and the result of the reusability experiments is illustrated in Figure 15. For this purpose, the used photocatalyst was collected and dried for the next cycle [35]. It was found that the MB removal efficiency was marginally decreased for the B-ZnO/TiO 2 photocatalyst in the successive cycles.…”

Section: Photocatalyst Reusabilitymentioning

confidence: 99%

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Natural Sunlight Driven Photocatalytic Removal of Toxic Textile Dyes in Water Using B-Doped ZnO/TiO2 Nanocomposites

et al. 2022

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A novel B-doped ZnO/TiO2 (B–ZnO/TiO2) nanocomposite photocatalyst was prepared using a mechanochemical–calcination method. For the characterization of the synthesized B–ZnO/TiO2 photocatalyst, XRD, FESEM-EDS, FTIR, UV-Vis DRS, BET, PL, and XPS techniques were used. The bandgap energy of B–ZnO/TiO2 was reduced, resulting in enhanced visible-light absorption. Significant PL quenching confirmed the reduction in the electron–hole recombination rate. Furthermore, reduced crystallite size and a larger surface area were obtained. Hence, the B–ZnO/TiO2 photocatalyst exhibited better photocatalytic activity than commercial TiO2, ZnO, B–ZnO, and ZnO/TiO2 in the removal of methylene blue (MB) dye under natural sunlight irradiation. The effects of various parameters, such as initial concentration, photocatalyst amount, solution pH, and irradiation time, were studied. Under optimal conditions (MB concentration of 15 mg/L, pH 11, B–ZnO/TiO2 amount of 30 mg, and 15 min of operation), a maximum MB removal efficiency of ~95% was obtained. A plausible photocatalytic degradation mechanism of MB with B–ZnO/TiO2 was estimated from the scavenger test, and it was observed that the •O2− and •OH radicals were potential active species for the MB degradation. Cyclic experiments indicated the high stability and reusability of B–ZnO/TiO2, which confirmed that it can be an economical and environmentally friendly photocatalyst.

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Section: Bet Studysupporting

confidence: 90%

Section: Xps Studymentioning

confidence: 96%

“…The following Equations ( 3) and ( 4) were used to compute the conduction band (CB) and valence band (VB) of ZnO and TiO 2 [35].…”

Section: Photocatalytic Degradation Mechanismmentioning

confidence: 99%

Section: Photocatalyst Reusabilitymentioning

confidence: 99%

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Natural Sunlight Driven Photocatalytic Removal of Toxic Textile Dyes in Water Using B-Doped ZnO/TiO2 Nanocomposites

et al. 2022

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“…More than 5 wt % of copper decreased the photocatalytic activity. This was because the ZnO surface was covered by the higher percentage of copper and reduced the sunlight absorption [35]. Due to efficient charge separation and higher electron transfer, 5 wt % CuO/ZnO composite showed better photocatalytic activity for MB degradation.…”

Section: Photocatalytic Dye Degradationmentioning

confidence: 99%

Synthesis of CuO/ZnO Nanocomposites and Their Application in Photodegradation of Toxic Textile Dye

et al. 2019

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CuO/ZnO composites are synthesized using a simple mechanochemical combustion method. X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), and Fourier transform infrared (FTIR) are used to characterize the prepared oxides. X-ray diffraction reveals that the prepared CuO/ZnO exhibit a wurtzite ZnO crystal structure and the composites are composed of CuO and ZnO. The strong peaks of the Cu, Zn, and O elements are exhibited in the EDX spectrum. The FTIR spectra appear at around 3385 cm −1 and 1637 cm −1 , caused by O-H stretching, and 400 cm −1 to 590 cm −1 , ascribable to Zn-O stretching. The photocatalytic performances of CuO/ZnO nanocomposites are investigated for the degradation of methylene blue (MB) aqueous solution in direct solar irradiation. The degradation value of MB with 5 wt % CuO/ZnO is measured to be 98%, after 2 h of solar irradiation. The reactive • O 2 − and • OH radicals play important roles in the photodegradation of MB. Mineralization of MB is around 91% under sunlight irradiation within 7 h. The photodegradation treatment for the textile wastewater using sunlight is an easy technique-simply handled, and economical. Therefore, the solar photodegradation technique may be a very effective method for the treatment of wastewater instead of photodegradation with the artificial and expensive Hg-Xe lamp.methyl orange. Kuriakose et al. [14] prepared CuO/ZnO nanocomposites using the carbothermal evaporation method and evaluated the photocatalytic degradation of methylene blue and methyl orange dyes under sunlight irradiation. Wang el al. [15] prepared MnO@MnOx microspheres through the solvothermal process and reported the degradation of levofloxacin under simulated sunlight irradiation. Nanocomposite photocatalytic technology can be considered a green technology and provides the advantages of abundance, including postpone electron-hole recombination, higher photocatalytic activity, and the ability to convert solar energy to chemical energy, which eventually realizes the solution of energy and environmental issues [16][17][18][19][20][21].ZnO is an n-type semiconductor, having a conductivity of about 10 −7 -10 −3 S/cm. It has a relatively large binding energy of 60 meV. However, the main disadvantages of ZnO are its fast electron-hole recombination rate and inefficient utilization of sunlight that lead to a reduction in photodegradation efficiency. The photodegradation performance of ZnO can be increased by modifying ZnO with transition metals [22]. Among the various transition metals, Cu-doped ZnO nanomaterials are of special interest due to the photocatalytic efficiency enhancement that creates defects in the lattice and reduces the recombination of photogenerated charge carriers [23]. Cu also provides plenty of advantages, such as low cost, more electronegativity than zinc, and a similar atomic size to that of zinc, and leads to better doping efficiency [24]. CuO is a natural p-type semiconductor with a narrow band gap, having a conductivity of 10 −4 ...

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Silica‐gel incorporated carbon paste sensor for the electrocatalytic oxidation of famotidine and its application in biological sample analysis

Vernekar

Shanbhag

Manasa³

et al. 2021

Electrochemical Science Adv

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Famotidine (FAM) is an efficacious competitive drug, and a reversible inhibitor of H2‐histaminergic receptor action used to manage acid production in the stomach. Among the elderly population, this drug poses the risk of kidney failure and impaired mental health conditions. Additionally, FAM is an environmental contaminant. Thus, FAM quantification was undertaken in urine and tablet dosage forms utilizing an uncomplicated, inexpensive, silica‐gel blended carbon paste electrode (SG/CPE) as an electrochemical sensor. In contrast to bare CPE, the existence of the modifier effectively enhanced the oxidation peak current for FAM. The impact of diversified factors such as time of accumulation, pH, sweep rate, and concentration variation was examined. Phosphate buffer solution (0.2 M) was employed for electro‐oxidation of FAM, and the optimum results were obtained at pH 3.0. The overall reaction at the sensing platform was under diffusion control with the involvement of a single electron transfer. The estimated heterogeneous rate constant (k°) was 3.493 × 103 s–1. Using the calibration curve, the calculated limit of detection (LOD) and limit of quantification (LOQ) were 11.72 × 10–8 M and 39.06 × 10–8 M, respectively. Among a variety of common interferents, the sensor demonstrated exceptional discrimination capabilities. Thus the proposed sensing platform displayed adequate sensitivity, selectivity, stability, reproducibility, and repeatability. Satisfactory recoveries were achieved for FAM in spiked human urine (91.40–97.50%) and tablet dosage forms (90.33–96.70 %), attesting the SG/CPE as a promising candidate for real‐time analysis. Novelty Statement: Silica gel/CPE as an electrochemical sensing platform exhibited remarkable electrocatalytic activity together with high sensitivity and selectivity for the quantitative determination of Famotidine (FAM). The developed method was validated by evaluating the accuracy, precision, stability, and anti‐interference properties. The lowest detection limit of 11.72 × 10–8 M was achieved, and the analytical advantage of the sensor is the quick quantification of FAM in pharmaceutical preparations and biological fluids.

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Fabrication of Ag-doped ZnO by mechanochemical combustion method and their application into photocatalytic Famotidine degradation

Cited by 24 publications

References 37 publications

Natural Sunlight Driven Photocatalytic Removal of Toxic Textile Dyes in Water Using B-Doped ZnO/TiO2 Nanocomposites

Natural Sunlight Driven Photocatalytic Removal of Toxic Textile Dyes in Water Using B-Doped ZnO/TiO2 Nanocomposites

Synthesis of CuO/ZnO Nanocomposites and Their Application in Photodegradation of Toxic Textile Dye

Silica‐gel incorporated carbon paste sensor for the electrocatalytic oxidation of famotidine and its application in biological sample analysis

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