Growth of ZnO nanowires on carbon fibers for photocatalytic degradation of methylene blue aqueous solutions: An investigation on the optimization of processing parameters through response surface methodology/central composite design

Tunç, Irmak Doğan; Erol, Mustafa; Güneş, Fethullah; Sütçü, Mücahit

doi:10.1016/j.ceramint.2019.11.244

Cited by 28 publications

(10 citation statements)

References 20 publications

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“…Several researchers have shown that a wide variety of materials of natural or biological origin have the ability to remove large amounts of organic pollutants from water (Weber et al 2011;Naidoo and Olaniran 2014;Chakraborty et al 2014;Bhattacharjee et al 2014;Sarkar et al 2015;Chakraborty et al 2017;Aloulou et al 2018;Shakeel et al, 2019;Asefi et al 2019;Ahmedkhan et al 2019;Priya et al 2020;Tunç et al 2019). Activated carbon (Yu-Li and Thomas 1995; Meshko et al 2001), alumina (Crini 2006), and zeolites (Meshko et al 2001) are considered some of the most versatile adsorbents, and many studies show their effectiveness, but their use is limited due to difficulties in their regeneration, and their relatively high cost (Sadlki et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Efficiency of natural clay and titania P25 composites in the decolouring of methylene blue (MB) from aqueous solutions: dual adsorption and photocatalytic processes

et al. 2021

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In this paper, we use Tunisian clay materials as alternative low-cost adsorbents, as well as substrates to immobilise TiO 2 for the decolouration of methylene blue (MB) dye solutions. The collected raw clay from the mine of Tamra was characterised by various techniques, such as X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray fluorescence (XRF). XRD patterns of the raw clay showed halloysite as the main phase (61%), with a lower content of kaolinite (39%). For MB adsorption, the experimental data were fitted by Langmuir and Freundlich adsorption equations. It was found that the studied clays alone were not very efficient at adsorbing MB dye molecules. The decolouration of MB was improved by adding a photocatalytic function to the clay, by adding various amounts of TiO 2 nanopowder (20-80 wt%) to the clay, imbuing it with photocatalytic capabilities. These combined effects of the phenomena of adsorption and photocatalysis for MB removal by the TiO 2 -doped clay resulted in a very satisfactory performance, even with the relatively low quantity of 20 wt% added TiO 2 photocatalyst. This gave 48.6% removal after only 30-min adsorption in the dark, increasing to 84.1% removal after a further 3 h under UV light, through combined chemo-physical adsorption and photocatalytic decolouration phenomena.

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Section: Introductionmentioning

confidence: 99%

Efficiency of natural clay and titania P25 composites in the decolouring of methylene blue (MB) from aqueous solutions: dual adsorption and photocatalytic processes

et al. 2021

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“…Among all RSM designs, the CCD method shows high predictability of responses and is the most efficient method for optimizing several variables. e CCD is used for determining the relationship among independent variables and their responses [36].…”

Section: Discussionmentioning

confidence: 99%

Investigation of Fe-Doped Graphitic Carbon Nitride-Silver Tungstate as a Ternary Visible Light Active Photocatalyst

Alosaimi

Azeem

Tahir

et al. 2021

Journal of Chemistry

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The rapid population growth and economic development have largely contributed to environmental pollution. Various advanced oxidation processes have been used as the most viable solution for the reduction of recalcitrant pollutants and wastewater treatment. Heterogeneous photocatalysis is one of the broadly used technologies for wastewater treatment among all advanced oxidation processes. Graphitic carbon nitride alone or in combination with various other semiconductor metal oxide materials acts as a competent visible light active photocatalyst for the removal of recalcitrant organic pollutants from wastewater. Rational designing of an environment-friendly photocatalyst through a facile synthetic approach encounters various challenges in photocatalytic technologies dealing with semiconductor metal oxides. Doping in g-C3N4 and subsequent coupling with metal oxides have shown remarkable enhancement in the photodegradation activity of g-C3N4-based nanocomposites owing to the modulation in g-C3N4 bandgap structuring and surface area. In the current study, a novel ternary Fe-doped g-C3N4/Ag2WO4 visible light active photocatalyst was fabricated through an ultrasonic-assisted facile hydrothermal method. Characterization analysis included SEM analysis, FTIR, XRD, XPS, and UV-Visible techniques to elucidate the morphology and chemical structuring of the as-prepared heterostructure. The bandgap energies were assessed using the Tauc plot. The ternary nanocomposite (Fe-CN-AW) showed increased photodegradation efficiency (97%) within 120 minutes, at optimal conditions of pH = 8, catalyst dose = 50 mg/100 ml, an initial RhB concentration of 10 ppm, and oxidant dose 5 mM under sunlight irradiation. The enhanced photodegradation of rhodamine B dye by ternary Fe-CN-AW was credited to multielectron transfer pathways due to insertion of a Fe dopant in graphitic carbon nitride and subsequent coupling with silver tungstate. The data were statistically assessed by the response surface methodology.

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“…The first broad diffraction peak at 23° (002 C plane of an aromatic layer) and the other weak diffraction peak at 42° (100 C plane of an aromatic layer) appeared, which confirmed that the CF was in an amorphous phase. After the Hg ions attached to the thiol group (CF-SH-Hg), the XRD showed a shift toward low theta values; this may have contributed to the effect of Hg binding to the thiol group, which led to this shift due to interaction with the structure via the introduction of a small portion of metal phase [34,35]. The thermogravimetric analysis (TGA) is illustrated in Figure 6 for three samples: CF-OH, CF-SH, and CF-SH-Hg.…”

Section: Surface Modificationmentioning

confidence: 99%

A Functionalised Carbon Fiber for Flexible Extraction and Determination of Hg(II) Using Au(NP)-Thiol-CF Inductively Coupled Plasma Mass Spectrometry

Ateeq

Durayhim

Sulayem

et al. 2021

Water

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This work illustrates the improvement in ultra-trace Hg(II) determination in water based on a novel flexible extraction and preconcentration technique (FEPT). This method focuses on the covalent functionalisation of carbon fibre (CF) based on (3-mercaptopropyl)trimethoxysilane. The functionalisation of CF is carried out in two steps: functionalising the surface of CF using acid treatment to obtain hydroxy and carboxyl groups on the surface, followed by a condensation reaction between the carboxyl or hydroxy groups on the carbon (CF-OH) and (3-mercaptopropyl)trimethoxysilane to form mercapto-CF (CF-SH). FTIR, EDX, SEM, XRD and UV-Vis were utilised to confirm the modification. ICP-MS is utilised to determine the Hg(II) and to assess the influence of the memory effect on the results using Au3+ solution and suspended Au nanoparticles (Au-NPs). The result shows that the Au-NPs improve Hg(II) detection and eliminate the memory effect. This study also includes appropriate parameters for contact time, eluent solution, pH, and the foreign metal and ions preconcentration factor. As a result, thiol-CF shows high Hg(II) uptake, flexibility, and stability during the analysis process, with a recovery of 98.96% ± 0.41% for 10 preconcentration factors. These features make FEPT a valuable method for extracting pollutants and overcoming the problems associated with the analysis of such samples.

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Growth of ZnO nanowires on carbon fibers for photocatalytic degradation of methylene blue aqueous solutions: An investigation on the optimization of processing parameters through response surface methodology/central composite design

Cited by 28 publications

References 20 publications

Efficiency of natural clay and titania P25 composites in the decolouring of methylene blue (MB) from aqueous solutions: dual adsorption and photocatalytic processes

Efficiency of natural clay and titania P25 composites in the decolouring of methylene blue (MB) from aqueous solutions: dual adsorption and photocatalytic processes

Investigation of Fe-Doped Graphitic Carbon Nitride-Silver Tungstate as a Ternary Visible Light Active Photocatalyst

A Functionalised Carbon Fiber for Flexible Extraction and Determination of Hg(II) Using Au(NP)-Thiol-CF Inductively Coupled Plasma Mass Spectrometry

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