Statistical screening and optimization of photocatalytic degradation of methylene blue by ZnO–TiO2/rGO nanocomposite

Viet, Thieu Quang Quoc; Khoi, Vu Hoang; Giang, Nguyễn Thị Hương; Anh, Hoang Thi Van; Dat, Nguyen Minh; Phong, Mai Thanh; Hieu, Nguyen Huu

doi:10.1016/j.colsurfa.2021.127464

Cited by 29 publications

(13 citation statements)

References 33 publications

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“…When comparing the obtained curves, it can be stated that significant differences between them do not occur. The characteristic peaks between 400 and 1000 cm −1 can be attributed to the bending vibration of the Ti–O–Ti and the stretching vibration of the Ti–O bonds [ 1 , 8 , 31 ]. These broad peaks in the mentioned range could also be attributed to a combination of Ti–O–Ti and Ti–O–C bond stretching vibrations [ 11 ].…”

Section: Resultsmentioning

confidence: 99%

“…These broad peaks in the mentioned range could also be attributed to a combination of Ti-O-Ti and Ti-O-C bond stretching vibrations [11]. The weak absorption peaks at 1040-1120 cm −1 can be attributed to the stretching vibration of the C-C bonds [21,31]. The peak at 1380 cm −1 is due to the symmetric deformation vibration of CH3 [21].…”

Section: Ft-ir Analysismentioning

confidence: 96%

“…Aging changes the nature of the pore size distribution curves for these aerogels (Figure 2b). The pore distribution curves have been changed from polymodal to unimodal with a peak in the range from 1 to 4 nm for the aerogels without an additional exchange The weak absorption peaks at 1040-1120 cm −1 can be attributed to the stretching vibration of the C-C bonds [21,31]. The peak at 1380 cm −1 is due to the symmetric deformation vibration of CH 3 [21].…”

Section: Bet Analysismentioning

confidence: 99%

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The Influence of the Precursor’s Nature and Drying Conditions on the Structure, Morphology, and Thermal Properties of TiO2 Aerogels

Donėlienė¹,

Fataraitė‐Urbonienė

Danchova

et al. 2022

Gels

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A cost-effective solution for the synthesis of high-porosity TiO2 aerogels, which can be used as a mesoporous perovskite network charge-carrier material during the manufacture of solar cells, is described. The effects of the synthesis parameters (precursor (titanium (IV) isopropoxide (TIP) and tetrabutyl orthotitanate (TBOT)), additional solvent exchange (n-hexane (nH), cyclohexane (CH), and diethyl ether (DE)), subcritical drying (800 mbar vacuum, 70 °C, 8 h), aging, and calcination on the aerogel’s structure have been investigated. Methods of XRD, FT-IR, BET, Raman, STA, SEM, UV–vis, and thermal conductivity measurements were applied to find out the relation between the synthesis conditions and the properties of the synthesized aerogels. Amorphous aerogels are polydispersed systems with the highest probability of pore diameter from 0.5 to 15 nm. An nH-exchanged, aged aerogel synthesized from the precursor TIP shows the highest diameter of pores. After calcination, the aerogels tend to crystallize into an anatase phase and the size of the crystallites depends on the precursor’s nature. Calcination leads to a significant increase in both the apparent and true density of the aerogels, and it also results in an increase in porosity and thermal conductivity.

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Section: Resultsmentioning

confidence: 99%

Section: Ft-ir Analysismentioning

confidence: 96%

Section: Bet Analysismentioning

confidence: 99%

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The Influence of the Precursor’s Nature and Drying Conditions on the Structure, Morphology, and Thermal Properties of TiO2 Aerogels

Donėlienė¹,

Fataraitė‐Urbonienė

Danchova

et al. 2022

Gels

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“…Thus, B, ZnO, and TiO 2 altogether resulted in a synergistic effect to obtain enhanced photocatalytic performance of B-ZnO/TiO 2 [17,26]. Furthermore, B-ZnO/TiO 2 nanocomposites exhibit superior photocatalytic performance compared to other nanocomposites presented in the literature [17,18,20,[40][41][42][43][44][45], as summarized in Table 2, indicating that B-ZnO/TiO 2 can be a promising photocatalyst for the removal of organic dyes.…”

Section: Photocatalytic Removal Of Mb Dyementioning

confidence: 90%

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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“…Generally, ZnO and TiO 2 form composites with substrate materials with large specific surface areas. The recombination rate of photogenerated carriers can be inhibited by controlling the size of the nanoparticles and by combining the electron or hole capture centers introduced by the substrate to increase the exposure time of catalytic active sites, which has become an effective method of improving the photocatalytic efficiency of ZnO and TiO 2 [16,17].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Photoelectrocatalytic Applications of TiO2/ZnO/Diatomite Composites

Yang

Wang

et al. 2022

Catalysts

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ZnO and TiO2 are semiconductor nanomaterials that are widely used in photocatalysis. However, the relatively high recombination rate and low quantum yield of photogenerated electron–hole pairs limit their practical applications. In this study, a series of TiO2/ZnO/diatomite composites with various compositions were successfully prepared via a two-step precipitation method. They exhibited stronger UV–visible absorption properties and substantially lower fluorescence intensities than those of ZnO and ZnO/diatomite, which was mainly due to the low recombination rate of the photogenerated electron–hole pairs in the composite system. The reaction intermediates of methylene blue were detected by liquid chromatography–mass spectrometry, and the degradation process was determined. The best composite catalyst was used for the degradation of gaseous methylbenzene and gaseous acetone. The gaseous acetone degradation product was determined to be acetaldehyde via gas chromatography–mass spectrometry. The results show that the composite catalyst exhibited a good photocatalytic degradation of both liquid pollutants and harmful volatile gases. When applied to the hydrogen and oxygen evolution reactions, the composite catalyst retained a good photoresponsivity and electrolytic efficiency.

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Statistical screening and optimization of photocatalytic degradation of methylene blue by ZnO–TiO2/rGO nanocomposite

Cited by 29 publications

References 33 publications

The Influence of the Precursor’s Nature and Drying Conditions on the Structure, Morphology, and Thermal Properties of TiO2 Aerogels

The Influence of the Precursor’s Nature and Drying Conditions on the Structure, Morphology, and Thermal Properties of TiO2 Aerogels

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

Synthesis and Photoelectrocatalytic Applications of TiO2/ZnO/Diatomite Composites

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