Titanium dioxide-molybdenum disulfide for photocatalytic degradation of methylene blue

Ibukun, Olaniyan; Evans, Prescott E.; Dowben, Peter A.; Jeong, Hae Kyung

doi:10.1016/j.chemphys.2019.110419

Cited by 29 publications

(8 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The maximum k value of 0.058 min −1 was observed for MB, which demonstrated that this catalyst had the highest photocatalytic degradation rate for MB. This was also much higher than result obtained using other semiconductors such as TiO 2 /MoS 2 with k = 0.040 min −1 32 , g-C 3 N 4 /MnV 2 O 6 (1:1), k = 0.022 min −1 33 ,CaTiO 3 :0.5%Eu 3+ , k = 0.005 min −1 34 , and Bi 2 CrO 6 , k = 0.006 min −1 35 .…”

Section: Resultsmentioning

confidence: 54%

A sustainable natural clam shell derived photocatalyst for the effective adsorption and photodegradation of organic dyes

Yao

Owens

et al. 2022

Sci Rep

View full text Add to dashboard Cite

In response to an increasing desire for modern industries to be both green and sustainable, there has been increasing research focus on the reutilization of natural waste materials to effectively remove and degrade toxic wastewater effluents. One interesting food industry waste product is clam shell. Here a new photocatalytic nanomaterial derived from marine clam shells was successfully prepared and characterized. Thereafter the material was applied for the removal of two target dyes from aqueous solution, where the effect of both catalyst dose and initial dye concentration on adsorption and photocatalysis was investigated. The maximum adsorption capacities of methylene blue (100 mg/L) and Congo red (500 mg/L) were 123.45 mg/g and 679.91 mg/g, respectively, where adsorption followed pseudo second order kinetics predominantly via a chemical adsorption process. The photodegradation removal efficiencies of the two dye solutions under visible light irradiation were 99.6% and 83.3% for MB and CR, respectively. The excellent degradation performance in a mixed dye solution, with strong degradation capability and low cost, demonstrated that the clam shell catalyst material was a good candidate for practical field remediation of dye contaminated wastewater.

show abstract

Section: Resultsmentioning

confidence: 54%

A sustainable natural clam shell derived photocatalyst for the effective adsorption and photodegradation of organic dyes

Yao

Owens

et al. 2022

Sci Rep

View full text Add to dashboard Cite

show abstract

“…The peaks observed at 27 • , 36 • and 55 • were assigned to the (110), ( 101) and (211) planes, respectively, of the rutile crystalline phase of TiO 2 . The most characteristic peaks of MoS 2 were also observed at 33 • (100), 39 • (103) and 60 • (110) [33][34][35]. The presence of AgNPs was evidenced by two peaks at 38 • and 46 • , corresponding to the crystallographic planes (111) and (200), respectively [24,32].…”

Section: Catalystmentioning

confidence: 93%

“…Additionally, other peaks were observed at 27° (110), 36° (101), 41° (111) and 54° (211), assigned to the rutile TiO2 crystalline phase [24,32]. The MoS2 characteristic peaks can be seen at 33° (100), 39° (103), 50° (105) and 57° (110) [33][34][35]. In the case of AgNPs, a small but distinguishable peak was observed at 46° (200) [24,32].…”

Section: Catalystmentioning

confidence: 96%

“…Additionally, other peaks were observed at 27 • (110), 36 • (101), 41 • (111) and 54 • (211), assigned to the rutile TiO 2 crystalline phase[24,32]. The MoS 2 characteristic peaks can be seen at 33 • (100), 39 • (103), 50 • (105) and 57 • (110)[33][34][35].In the case of AgNPs, a small but distinguishable peak was observed at 46 • (200)[24,32]. The peak associated with silver (111) was not detected due to the overlap with a characteristic peak of anatase at the same angle(38 • ).…”

mentioning

confidence: 96%

See 1 more Smart Citation

Hydrogen Production and Degradation of Ciprofloxacin by Ag@TiO2-MoS2 Photocatalysts

Machín¹,

Fontánez

García

et al. 2022

Catalysts

View full text Add to dashboard Cite

The photocatalytic activity of silver-based catalysts containing different amounts of molybdenum disulfide (MoS2; 5, 10 and 20 wt.%) was evaluated by the degradation of the antibiotic ciprofloxacin and the production of hydrogen via water splitting. All the silver (Ag)-based catalysts degraded more than 70% of the antibiotic in 60 min. The catalyst that exhibited the best result was 5%Ag@TiO2-P25-5%MoS2, with ca. 91% of degradation. The control experiments and stability tests showed that photocatalysis was the degradation pathway and the selected silver-based catalysts were stable after seven cycles, with less than 2% loss of efficiency per cycle and less than 7% after seven cycles. The catalyst with the highest hydrogen production was 5%Ag@TiO2 NWs-20%MoS2, 1792 μmol/hg, at a wavelength of 400 nm. This amount was ca. 32 times greater than that obtained by the pristine titanium oxide nanowires catalyst. The enhancement was attributed to the high surface area of the catalysts, along with the synergism created by the silver nanoparticles and MoS2. All the catalysts were characterized by X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), Raman spectroscopy, field-emission scanning electron microscopy (FE-SEM), high-resolution transmission electron microscopy (HRTEM), Brunauer–Emmett–Teller (BET) surface area analysis and energy dispersive X-ray spectroscopy (EDS).

show abstract

“…The main problem of photocatalysis technology is how to improve the performance of the catalyst. Although some photocatalytic materials such as TiO 2 ( Ibukun et al, 2019 ), ZnO ( Rodrigues et al, 2020 ), CdS ( Lei et al, 2019 ), ZrO 2 ( Siwińska-Ciesielczyk et al, 2020 ), and WO 3 ( Ghenaatgar et al, 2019 ) have been commonly used, their wide bandgap width, easy recombination of photoelectron-hole pairs, low quantum efficiency, and poor stability ( Hernández-Alonso et al, 2009 ; Bethi et al, 2016 ; Hu et al, 2016 ) result in low photocatalytic efficiency. Among photocatalysts, g-C 3 N 4 has emerged as a robust semiconductor photocatalytic material because it is a non-metallic element; has a narrow band gap width (2.70 eV),and stable chemical properties; and is less costly ( Niu et al, 2012 ; Cao and Yu, 2014 ; Ye et al, 2015 ; Wei et al, 2019 ; Prasad et al, 2020 ).…”

Section: Introductionmentioning

confidence: 99%

Combined the Photocatalysis and Fenton-like Reaction to Efficiently Remove Sulfadiazine in Water Using g-C3N4/Ag/γ-FeOOH: Insights Into the Degradation Pathway From Density Functional Theory

et al. 2021

View full text Add to dashboard Cite

Sulfadiazine (SDZ) is a common antibiotic pollutant in wastewater. Given that it poses a risk as an environmental pollutant, finding effective ways to treat it is important. In this paper, the composite catalytic material g-C3N4/Ag/γ-FeOOH was prepared, and its degradation performance was studied. g-C3N4/Ag/γ-FeOOH had a superior degradation effect on SDZ than g-C3N4 and γ-FeOOH. Compared with different g-C3N4 loadings and different catalyst dosages (5, 10, 25, and 50 mg/L), 2 mg/L g-C3N4/Ag/γ-FeOOH with a g-C3N4 loading of 5.0 wt% has the highest degradation promotion rate for SDZ, reaching up to 258.75% at 600 min. In addition, the photocatalytic enhancement mechanism of the catalyst was studied. Density functional theory (DFT) calculations indicated that the enhancement of photocatalytic activity was related to the narrowing of the forbidden band and the local electron density of the valence band. The bandgap of the catalyst was gradually narrowed from 2.7 to 1.05 eV, which can increase the light absorption intensity and expand the absorption edge. The density of states diagram showed that the local resonance at the interface could effectively improve the separation efficiency of e−-h+ pairs. Four degradation paths of SDZ were speculated based on DFT calculations. The analysis confirmed that the degradation path of SDZ primarily included Smiles-type rearrangement, SO2 extrusion, and S-N bond cleavage processes.

show abstract

Titanium dioxide-molybdenum disulfide for photocatalytic degradation of methylene blue

Cited by 29 publications

References 44 publications

A sustainable natural clam shell derived photocatalyst for the effective adsorption and photodegradation of organic dyes

A sustainable natural clam shell derived photocatalyst for the effective adsorption and photodegradation of organic dyes

Hydrogen Production and Degradation of Ciprofloxacin by Ag@TiO2-MoS2 Photocatalysts

Combined the Photocatalysis and Fenton-like Reaction to Efficiently Remove Sulfadiazine in Water Using g-C3N4/Ag/γ-FeOOH: Insights Into the Degradation Pathway From Density Functional Theory

Contact Info

Product

Resources

About