Carbon as amorphous shell and interstitial dopant in mesoporous rutile TiO2: Bio-template assisted sol-gel synthesis and photocatalytic activity

Mohamed, Mohamad Azuwa; Salleh, Wan Norharyati Wan; Jaafar, Juhana; Rosmi, Mohamad Saufi; Hir, Zul Adlan Mohd; Mutalib, Mashetoh Abd; Ismail, Ahmad Fauzi; Tanemura, Masaki

doi:10.1016/j.apsusc.2016.09.145

Cited by 97 publications

(43 citation statements)

References 88 publications

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“…Meanwhile, both peaks of 281.01 eV (0.8AA) and 281.01 (P25 TiO2) were attributed to substitutional Ti-C bond as mentioned by M.A. Mohamed et al [5]. New peak also emerged at 293.39 eV for 0.8AA which could be caused by the addition of AA.…”

Section: Fig 2 Xps Spectra Of Selected Tio2 Nanocrystals: A) O 1s Amentioning

confidence: 66%

“…Recently, photocatalytic reduction of CO2 provides a realistic insight to minimize atmospheric CO2 while fulfilling the fuel production for world energy demand [1][2][3][4]. Virtually, TiO2 photocatalyst has gained huge attraction for CO2 photoreduction process owing to its reasonable price, non-toxic, chemically stable, and both optically and electronically stable [5].…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of ascorbic acid enhanced TiO2 photocatalyst: its characterization and catalytic activity in CO2 photoreduction

2018

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To date, the development of solar environmental remediation has shifted more emphasis on the green and simple synthesis of catalyst for CO2 photocatalysis process. Herein, TiO2 photocatalyst was successfully synthesized via hydrothermal method. The effects of the different molar ratio of ascorbic acid C6H8O6, (AA) added during the preparation of TiO2 nanoparticles were comprehensively studied. The characterization of TiO2 nanocrystals was performed via XRD, XPS, DRUV-vis, and FTIR. The results show the AA loading into TiO2 nanoparticles significantly intensified the XRD spectra of anatase structure. In fact, this feature had signified a reactivity of the photocatalyst in the visible region. In an instance, BET surface area was also enhanced with the highest recorded value of 135.14 m2/g for 0.8AA. Meanwhile, the CO2 photoreduction over synthesized TiO2 had produced the highest amount of HCOOH at 39.3 μmol/g cat for 0.8AA within 6 hours of reaction time. Furthermore, the DRUV-vis analysis had illustrated better light absorption ability of 0.8AA. This profound finding is attributed to the correlation between large surface area, pure anatase phase, and high adsorbed water molecules. Therefore, this study had significantly demonstrated the potential of modified TiO2 with AA in CO2 photocatalysis area while simultaneously presents a green and simple method for TiO2 synthesis.

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Section: Fig 2 Xps Spectra Of Selected Tio2 Nanocrystals: A) O 1s Amentioning

confidence: 66%

Section: Introductionmentioning

confidence: 99%

Synthesis of ascorbic acid enhanced TiO2 photocatalyst: its characterization and catalytic activity in CO2 photoreduction

2018

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“…Meanwhile, the N 2 sorption plot of Co-30 resembled type IV(a) isotherm with hysteresis loop H5, indicating the behavior of mesopores structure associated with open and partially blocked pores. [75,76] Different from Co-10, Co-15, and Co-20, the pore size of Co-30 was widely distributed in the range from 4 to 11 nm (Figure 3 (c)). This is attributed to the structural properties of the catalysts where Co-30 is crystallized while Co-10, Co-15, and Co-20 are amorphous (as observed in Figure 1).…”

Section: Resultsmentioning

confidence: 93%

“…Correspondingly, the pore size distribution of these catalysts was centered at around 4 nm (Figure (c) and Table ). Meanwhile, the N 2 sorption plot of Co‐30 resembled type IV(a) isotherm with hysteresis loop H5, indicating the behavior of mesopores structure associated with open and partially blocked pores . Different from Co‐10, Co‐15, and Co‐20, the pore size of Co‐30 was widely distributed in the range from 4 to 11 nm (Figure (c)).…”

Section: Resultsmentioning

confidence: 98%

Development of Co Supported on Co−Al Spinel Catalysts from Exsolution of Amorphous Co−Al Oxides for Carbon Dioxide Reforming of Methane

et al. 2019

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In this study, redox exsolution method was used to synthesize Co/Co−Al spinel for dry reforming. The aim is to improve metal‐support interaction, which enhances the catalyst's stability and minimizes carbon deposition. The synthesized catalysts were observed as Co embedded on Co deficient CoAl2O4‐like spinel (denoted as Co−Al spinel). The reduction temperature was optimized at 750 °C. Investigations on the effect of Co loading revealed that optimum Co loading is needed to control the Co particle size, providing balance between limiting carbon deposition rate and preventing dissolution of Co into the support. The best performing catalyst, Co‐15, in which the molar ratio of Co and Al is 15 : 85 produced a stable 81.5 % and 87.4 % conversions for CH4 and CO2 continuously over 24 h of reaction time with 13.51 wt% of carbon deposition. The strong metal‐support interaction of Co and Co−Al spinel in Co‐15 stabilizes and prevents the sintering of Co particles, enhancing the efficiency for dry reforming reaction.

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“…The absorption pattern and band gap energy measurement of the prepared PZ-17 hybrid film photocatalyst is illustrated in Figure 6. The photocatalyst's band gap was evaluated by constructing a graph according to αhv = A(hv − E g ) 2 , where α is an absorption coefficient, A is a constant, hv is the energy of a photon, E g is the optical band gap [33]. The hv was derived from hv = hc/λ, where h is the Planck constant (4.136 × 10 −15 eV), c is the velocity of the light in vacuum (2.977 × 1017 nm/s), and λ is the wavelength (nm).…”

Section: X-ray Photoelectron and Optical Property Analysismentioning

confidence: 99%

Photoactive Hybrid Film Photocatalyst of Polyethersulfone-ZnO for the Degradation of Methyl Orange Dye: Kinetic Study and Operational Parameters

et al. 2017

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Abstract:A facile and effective technique to immobilize photocatalyst nanoparticles by incorporating zinc oxide (ZnO) into polyethersulfone polymeric films by means of a phase inversion technique is reported. The degradation study of methyl orange (MO) dye was performed using a series of ZnO-embedded polymer hybrid systems. The photoactivity of the films increased in parallel with increased ZnO loading up to 17 wt%. The photodegradation process followed a pseudo first-order kinetics with an achievement of almost 100% MO removal in original conditions. The PZ-17 film demonstrated an excellent and comparable degradation performance up to five cycles, signifying the reliability of the film photocatalyst against ultraviolet irradiation and degradation.

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Carbon as amorphous shell and interstitial dopant in mesoporous rutile TiO2: Bio-template assisted sol-gel synthesis and photocatalytic activity

Cited by 97 publications

References 88 publications

Synthesis of ascorbic acid enhanced TiO2 photocatalyst: its characterization and catalytic activity in CO2 photoreduction

Synthesis of ascorbic acid enhanced TiO2 photocatalyst: its characterization and catalytic activity in CO2 photoreduction

Development of Co Supported on Co−Al Spinel Catalysts from Exsolution of Amorphous Co−Al Oxides for Carbon Dioxide Reforming of Methane

Photoactive Hybrid Film Photocatalyst of Polyethersulfone-ZnO for the Degradation of Methyl Orange Dye: Kinetic Study and Operational Parameters

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