Constructing bio-templated 3D porous microtubular C-doped g-C3N4 with tunable band structure and enhanced charge carrier separation

Mohamed, Mohamad Azuwa; Zain, Muhammad Fauzi Mohd.; Minggu, Lorna Jeffery; Kassim, Mohammad B.; Amin, Nor Aishah Saidina; Salleh, Wan Norharyati Wan; Salehmin, Mohd Nur Ikhmal; Nasir, Mohd Faizal Md; Hir, Zul Adlan Mohd

doi:10.1016/j.apcatb.2018.05.037

Cited by 222 publications

(77 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…As observed in Figure 3 (a), before reduction, the overall N 2 sorption plot of Co-10, Co-15, and Co-20 resembled type IV(a) isotherm with H2(a) hysteresis loop (based on IUPAC classification), indicating mesoporous structure with severe pore-blocking. [72][73][74] Correspondingly, the pore size distribution of these catalysts was centered at around 4 nm (Figure 3 (c) and Table 3). 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.…”

Section: Resultsmentioning

confidence: 85%

“…The corresponding BET surface area and average pore volume of these catalysts were tabulated in Table . As observed in Figure (a), before reduction, the overall N 2 sorption plot of Co‐10, Co‐15, and Co‐20 resembled type IV(a) isotherm with H2(a) hysteresis loop (based on IUPAC classification), indicating mesoporous structure with severe pore‐blocking . Correspondingly, the pore size distribution of these catalysts was centered at around 4 nm (Figure (c) and Table ).…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

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

View full text Add to dashboard Cite

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.

show abstract

Section: Resultsmentioning

confidence: 85%

Section: Resultsmentioning

confidence: 99%

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

View full text Add to dashboard Cite

show abstract

“…This results is higher compared to the study conducted in the past [22,23]. However, the photocatalytic mechanism of LaFeO 3 nanocrystalline is the most important thing to consider and this can be determined by species trapping or scavenging experiments [24]. 1 mmol of 1-propanol (IPA), 1 mmol of ammonium oxalate (AO) and 1 mmol of p-benzoquinone (BQ) was added in the reaction system as the hydroxyl radical (·OH), hole (h +) and superoxide radical (·O 2 − ) scavenger, respectively.…”

Section: Photocatalytic Activity Mechanismsmentioning

confidence: 72%

“…(4)]. Due to less positivity of LaFeO 3 valence band, it is unable to generate enough hydroxyl radicals (·OH) species for individual application in phenol degradation [24]. However, the photogenerated holes at the VB which possessed the high oxidative potential would allow direct oxidation of phenol and degraded them simultaneously [Eq.…”

Section: Photocatalytic Activity Mechanismsmentioning

confidence: 99%

“…(5)]. Mohamed et al [24] suggested that the direct hole oxidation can be easily initiated when the adsorption of the photocatalysts is enough, and the concentrations of pollutants on photocatalyst surface is relatively high, and this may apply to multiple photocatalysts with same mechanism. Moreover, they also proposed that increased adsorption of organic contaminants such as phenol is due to strong π-π interactions and the high surface area of the photocalysts, leading to the higher photodegradation activity.…”

Section: Photocatalytic Activity Mechanismsmentioning

confidence: 99%

See 1 more Smart Citation

Photocatalytic degradation of phenol by LaFeO3 nanocrystalline synthesized by gel combustion method via citric acid route

et al. 2018

View full text Add to dashboard Cite

Focusing on the photocatalytic degradation of phenol under visible light, the synthesized lanthanum orthoferrites (LaFeO 3 ) by gel combustion method using citric acid as sacrificial agent were investigated. With the highest reaction temperature of 200 °C, the physicochemical properties of synthesized samples were characterized by X-Ray diffraction (XRD) analysis, Brunauer-Emmet-Teller (BET), and Energy Dispersive X-Ray spectroscopy (EDS). On the other hand, UV-Vis spectroscopy analysis was carried out to determine the phenol photodegradation activities and mechanism. The results suggested the well-defined LaFeO 3 nanocrystals with specific area of 28 m 2 g −1 were successfully synthesized. Besides that, variations in operating parameters such as pH, catalyst dosage and initial concentration of phenol in synthetic wastewater were also examined. In conclusion, LaFeO 3 nanocrystalline exhibited an exceptional photocatalytic activity for phenol degradation, thus providing a perfect alternative for pharmaceutical wastewater treatment.

show abstract

Modulating the Site Density of Mo Single Atoms to Catch Adventitious O Atoms for Efficient H₂O₂ Oxidation with Light

et al. 2022

View full text Add to dashboard Cite

nonmetal atoms from open environment also have the stable coordination interaction to saturate SAs. [8][9][10][11] Among previous reports, the most common case is that SAs are covered by oxygen (O) in the air, because O can provide well-matched p-orbitals to couple with the d-orbitals of metal centers. [12][13][14] Such coordinated O atoms stretched out of SAs could construct chemical environments with negative charge, benefiting for adsorbing electropositive matters. [15,16] In addition, the coordinated O atoms can gather photoelectrons from SAs anchored on semiconductor under irradiation, further lowering the activation energy barriers. [17] However, how to construct and modulate the adventitious O coordination on SAs still remains ambiguous, which hampers the understanding on the real role of coordination environment around SAs in catalysis.To catch adventitious O atoms in open environment, it is better to choose the metal SAs with the strong ability for bonding with O atoms. From such view, molybdenum (Mo) exhibits the combined merits for catching and tuning O atoms, including the moderate half-full electrons state ([Kr] 4d 5 5s 1 ), the short length of Mo-O bonding (≈1.2 Å) and the multiple valence states. [18][19][20] Thus, the amounts of coordinated O atoms can be directly controlled by the site density of Mo-SAs. The next step is to Coordination environment and site density have great impacts on the catalytic performance for single atoms (SAs). Herein, the site density of Mo-SAs on red polymeric carbon nitrides (RPCN) is modulated via a local carbonization strategy to controllably catch adventitious O atoms from open environment. The addition of melamine derivants with hydrocarbyl chains induces local carbonization during RPCN pyrolysis. These local carbonization regions bring abundant graphitic N 3C to anchor Mo-SAs, and most of Mo-SAs catch the O atoms in air, forming the O 2 -covered Mo-N 3 coordination. The dopants of carbon source with different structures and amounts can modulate the site density of Mo-SAs, therefore controlling the amounts of coordinated O atoms. Furthermore, coordinated O atoms around Mo-SAs construct the catalytic environment with Lewis base and gather photo-generated electrons under light. Such O-covered Mo-SAs endow RPCN materials (Mo-RPCN) with a strong ability for hydrogen abstraction, leading to the 99.51% ratio (28.8 mmol min −1 g −1 ) rate for thioanisole conversion with H 2 O 2 assisted advance oxidation technology. This work brings a new sight on the coordinated atoms dominant oxidation process.

show abstract

Constructing bio-templated 3D porous microtubular C-doped g-C3N4 with tunable band structure and enhanced charge carrier separation

Cited by 222 publications

References 58 publications

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

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

Photocatalytic degradation of phenol by LaFeO3 nanocrystalline synthesized by gel combustion method via citric acid route

Modulating the Site Density of Mo Single Atoms to Catch Adventitious O Atoms for Efficient H₂O₂ Oxidation with Light

Contact Info

Product

Resources

About

Constructing bio-templated 3D porous microtubular C-doped g-C3N4 with tunable band structure and enhanced charge carrier separation

Cited by 222 publications

References 58 publications

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

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

Photocatalytic degradation of phenol by LaFeO3 nanocrystalline synthesized by gel combustion method via citric acid route

Modulating the Site Density of Mo Single Atoms to Catch Adventitious O Atoms for Efficient H2O2 Oxidation with Light

Contact Info

Product

Resources

About

Modulating the Site Density of Mo Single Atoms to Catch Adventitious O Atoms for Efficient H₂O₂ Oxidation with Light