Precise design of graphitic carbon nitride (gC3N4) nanostructures is of grand importance in different catalytic applications. This article emphasizes additional data on the fabrication of metal-free gC3N4 nanofibres (gC3N4NFs) and its associated structural and composition analysis compared with Au/Pd co-doped gC3N4 nanofibres (Au/Pd/gC3N4NFs). The data is including the typical fabrication process of metal-free gC3N4 nanofibers and its SEM, TEM, and element mapping analysis beside Raman, and FTIR spectra relative to Au/Pd/gC3N4NFs. We also investigated the catalytic CO oxidation durability testes on Au/Pd/gC3N4NFs compared to Pd/gC3N4NFs and Au/gC3N4NFs. The presented data are associated with the research article entitled “Rational synthesis of one-dimensional carbon nitride-based nanofibers atomically doped with Au/Pd for efficient carbon monoxide oxidation.” [1].This publication was supported by Qatar University Internal Grant No. IRCC-179 . The findings achieved herein are solely the responsibility of the authors.Scopu

Abdullah A.M.

Eid K.

Eldesoky A.S.

Sliem M.H.

English

Qatar University Institutional Repository

Data in brief 27 (2019) 104734Contents lists available at ScienceDirectData in briefjournal homepage: www.elsevier .com/locate/dibData ArticleData on structural and composition-relatedmerits of gC3N4 nanofibres doped and undopedwith Au/Pd at the atomic level for efficientcatalytic CO oxidationKamel Eid a, Mostafa H. Sliem a, Amal S. Eldesoky b,Aboubakr M. Abdullah a, *a Center for Advanced Materials, Qatar University, Doha, P.O. Box 2713, Qatarb Department of Biomedical Engineering, Higher Technological Institute, 10th of Ramadan, 228, Egypta r t i c l e i n f oArticle history:Received 18 May 2019Received in revised form 21 October 2019Accepted 22 October 2019Available online 30 October 2019Keywords:CO oxidationgC3N4Greenhouse gasesOne-dimensionalgC3N4 nanofibersDOI of original article: https://doi.org/10.1016/* Corresponding author.E-mail address: bakr@qu.edu.qa (A.M. Abdullahhttps://doi.org/10.1016/j.dib.2019.1047342352-3409/© 2019 The Authors. Published by Elscreativecommons.org/licenses/by/4.0/).a b s t r a c tPrecise design of graphitic carbon nitride (gC3N4) nanostructures isof grand importance in different catalytic applications. This articleemphasizes additional data on the fabrication of metal-free gC3N4nanofibres (gC3N4NFs) and its associated structural and composi-tion analysis compared with Au/Pd co-doped gC3N4 nanofibres(Au/Pd/gC3N4NFs). The data is including the typical fabricationprocess of metal-free gC3N4 nanofibers and its SEM, TEM, andelement mapping analysis beside Raman, and FTIR spectra relativeto Au/Pd/gC3N4NFs. We also investigated the catalytic CO oxidationdurability testes on Au/Pd/gC3N4NFs compared to Pd/gC3N4NFsand Au/gC3N4NFs. The presented data are associated with theresearch article entitled “Rational synthesis of one-dimensionalcarbon nitride-based nanofibers atomically doped with Au/Pd forefficient carbon monoxide oxidation.” [1].© 2019 The Authors. Published by Elsevier Inc. This is an openaccess article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).j.ijhydene.2019.05.105.).evier Inc. This is an open access article under the CC BY license (http://Specifications TableSubject area ChemistryMore specific subject area CatalysisType of data Scheme, Tables, FiguresHow data was acquired Transmission electron microscope ((TEM), TecnaiG220, FEI, Hillsboro, OR, USA)equipped with Energy Dispersive X-Ray Analysis (EDX), scanning electronmicroscope ((SEM), Hitachi S-4800, Hitachi, Tokyo, Japan), Raman spectroscopy(PerkinElmer Raman Station 400 spectrometer), and CO oxidation stability tests(online gas analyzer IR-200, Yokogawa, Japan).Data format The presented raw data are imaged and analyzed.Experimental factors The CO oxidation durability tests were carried out under continuous gasmixturegas flow while heating from room temperature to 300 C.Experimental features The CO conversion durability tests were benchmarked as a function oftemperature and metal dopants.Data source location Center for advanced materials, Qatar University, Doha P.O. Box 2713, Qatar.Data accessibility The data are available in this articleRelated research article Rational synthesis of one-dimensional carbon nitride-based nanofibersatomically doped with Au/Pd for efficient carbon monoxide oxidation.” [1]Value of the Data The present data allowed controlling the shape and composition of gC3N4 nanofibers that paves the way for scientists totailor and decipher the formation mechanism of gC3N4. This data allowed understanding the architectural and compositional related merits of the gC3N4-based materials; thus, itis beneficent for controlling their properties for various catalytic applications. Investigating the catalytic CO oxidation stability of Au/Pd/gC3N4NFs is essential for its scaling up for the commercialapplications. These data can serve as a benchmark for further development of new gC3N4-based nanostructures for CO conversion toCO2 and other gas conversion reactions.K. Eid et al. / Data in brief 27 (2019) 10473421. DataThe presented herein data provides deep insights on the rational synthesis of metal-free gC3N4NFsand its correlated analysis relative to Au/Pd/gC3N4NFs. This is in addition to the CO oxidation durabilityof Au/Pd/gC3N4NFs and its compositional analysis after CO oxidation reaction. Particularly, the datainvolves the SEM, TEM, and elemental mapping images of gC3N4NFs (Fig. 1), while the FTIR andRaman spectra of gC3N4NFs compared to Au/Pd/gC3N4 are represented in Fig. 2 and Fig. 3,respectively. Meanwhile, the CO oxidation stability testes carried out on Au/Pd/gC3N4NFs, Pd/gC3N4NFs, and Au/gC3N4NFs beside their loss in the complete conversion temperature (T100) are shownin (Fig. 4). This is alongside the Energy Dispersive X-ray Analysis (EDX) analysis of Au/Pd/gC3N4NFsafter the CO oxidation durability testes (Fig. 5) and the schematic reveals the synthetic mechanismprocess of Au/Pd/gC3N4NFs in (Fig. 6).2. Experimental design, materials, and methods2.1. Synthesis of metal-free gC3N4NFsFig. 1 shows the SEM and TEM images of metal-free gC3N4NFs typically synthesized by the slowdispersion of melamine (1 g) in an aqueous solution of isopropanol (30mL, 99%) under stirring at 40 C.Then, an aqueous solution of nitric acid (HNO3, 60 mL, 0.3 M) was added to the previous solution understirring at 40 C. The as-formed white precipitate was filtered and washed with isopropanol solutionbefore being dried at 100 C for 12 h. Finally, the obtained powder was subsequently annealed undernitrogen at 550 C for 2 h (5 C min1).K. Eid et al. / Data in brief 27 (2019) 104734 3The fabrication of Au/Pd/gC3N4NFs was done according to the same procedure of metal-freegC3N4NFs but in presence of Au and Pd precursors before the addtion of HNO3 (see Ref. [1] formore information).The SEM image clearly shows the formation of uniform one-dimensional fiber-like morphology inhigh yield (nearly 100%) without resolving any other undesired shapes such as spherical and sheets(Fig. 1a). The average length of thus formed nanofibers obtained from the TEM is about 10 mm. The TEMimage further confirmed the formation of a nanofiber structure with smooth surfaces and had anaverage width of nearly 80 ± 2 nm (Fig. 1b). The element mapping analysis indicated the presence ofboth C and N with an atomic ratio of 41 and 59, respectively (Fig. 1c and d).2.2. Chemical structure and composition analysisThe chemical bonds and the functional groups of both Au/Pd/gC3N4NFs and gC3N4NFs were eval-uated using the Fourier transform infrared (FTIR) analysis. Both Au/Pd/gC3N4NFs and gC3N4NFsrevealed the peaks attributed to the stretching vibration of triazine at 810 cm1 and several peaks forCeN heterocycles from 1000 to 1750 cm1 (Fig. 2) [2]. The weak bands observed between 2900 and3300 cm1 are assigned to the NeH vibrations at the edges of gC3N4-based material. The anchoring ofFig. 1. (a) SEM and (b) TEM images of typically synthesized gC3N4NFs. (ced) Elemental mapping of nitrogen and carbon recordedfrom the marked area in (a). For the SEM and elemental mapping images, 2 mg of the powder was stacked on a carbon tab andimaged as it is. For the TEM analysis, 1 mg/mL of the powder was dispersed in ethanol solution, and 10 ml solution was mounted on acarbon-coated copper TEM grid and left to dry before the imaging.Fig. 2. FTIR of the as-synthesized Au/Pd/gC3N4NFs and gC3N4NFs. Before the measurements, the samples were mixed with 0.1% ofKBr powder followed by grinding for 3 min and then pressed into a pellet.Fig. 3. Raman spectra of (a) typically formed Au/Pd/gC3N4NFs and gC3N4NFs and (b) commercial melamine. The Raman spectra wererecorded on a PerkinElmer Raman Station 400 spectrometer under 785 nm laser excitation. Before the measurements, the sampleswere dispersed in ethanol solution (2 wt %) and then deposited on a glass slide (0.5  0.5 cm2), and left to dry at room temperature.K. Eid et al. / Data in brief 27 (2019) 1047344Au and Pd over N-atoms inside Au/Pd/gC3N4NFs slightly broadens and decreases in the intensity ofNeH and CeN bands of Au/Pd/gC3N4NFs [1e4].Fig. 3a shows the Raman spectra of gC3N4NFs, compared to Au/Pd/gC3N4NFs. Both materialsrevealed a sharp peak at 1555 cm1 of graphitic (G) band, which indicates the high degree of graph-itization of the as-obtained materials [4,5]. The G band of Au/Pd/gC3N4NFs was slightly positivelyshifted relative to that of gC3N4NFs, implying its higher strained effect. Additionally, both materialsFig. 4. The CO oxidation durability tests over (a) Au/Pd/gC3N4NFs, (b) Pd/gC3N4NFs, and (c) Au/gC3N4NFs. (d) Comparison betweenthe T100 before and after the stability tests on the as-synthesized catalysts.Fig. 5. The EDX analysis of Au/Pd/gC3N4NFs after the CO oxidation durability tests.K. Eid et al. / Data in brief 27 (2019) 104734 5Fig. 6. A scheme illustrates the synthetic mechanism process of Au/Pd/gC3N4 nanofibers and the distribution of both Au and Pd inside the skeletal structure of gC3N4.K.Eidetal./Datainbrief27(2019)1047346Table 1The position of the resolved Raman spectra of the as-prepared materials.Materials G-band D-band (Gˋ-band)Au/Pd/gC3N4NFs 1555 cm1 1360 cm1 2690 cm1gC3N4NFs 1554 cm1 1359 cm1 2689 cm1K. Eid et al. / Data in brief 27 (2019) 104734 7displayed a small spectrum at 2690 cm1 of (Gˋ peak), resulting from the disordered surface. Fig. 3bshows the typical spectrum of melamine starting from 500 until 3000 cm1, which are dissimilar tothose recorded for Au/Pd/gC3N4NFs and gC3N4NFs [1e3]. Table 1 summarizes the identification andposition for Raman spectra of Au/Pd/gC3N4NFs and gC3N4NFs.2.3. CO oxidation stability testsThe CO oxidation is of particular interest in wide varieties of industrial, biological, and environ-mental remediation applications [2,6e8]. Thus, it is essential to develop efficient and durable catalystsfor CO oxidation reaction to convert highly toxic CO gas into less toxic gasses or other fuels [1e4,8e11].After determination, the complete CO conversion temperature (T100) on the as-synthesized Au/Pd/gC3N4NFs, Pd/gC3N4NFs, and Au/gC3N4NFs, the long-term durability tests were investigated at theirT100 for 48 h. In particular, the catalysts were exposed to the gasmixture consisting of CO (4%), O2 (20%),and Ar (76%) with a total flow of 50 mL min1 and the temperature was increased steadily (5 C min1)until the T100 of each catalyst. Then, the percentage of CO conversionwas monitored through an onlinemultichannel infrared gas analyzer (IR200, Yokogawa, Japan). Following the durability tests, the COconversion efficiencies were measured again through the pretreatment at 250 C under an O2 flow of50mLmin1, and H2 (30mLmin1) for 1 h. Then, each catalyst was exposed to a gasmixture of CO (4%),O2 (20%), and Ar (76%) with a total flow of 50 mL min1, while heating from the room temperature tillthe complete CO conversion occurred.Fig. 4 shows the CO oxidation durability of Au/Pd/gC3N4NFs compared to Pd/gC3N4NFs, and Au/gC3N4NFs. In particular, after the accelerated durability tests, Au/Pd/gC3N4NFs reserved its initial COoxidation activity without any noticed loss (Fig. 4a); meanwhile, Pd/gC3N4NFs loss is around 7%(Fig. 4b) and Au/gC3N4NFs lose about 11% (Fig. 4c). However, from the light-off curves for the COconversion durability expressed as a function of time, all materials did not show any noticed change inthe CO oxidation kinetics. To this end, the estimated T100 after the stability cycles on Au/Pd/gC3N4NFs,Pd/gC3N4NFs, and Au/Pd/gC3N4NFs were about 146 C, 203 C, and 246.4 C, respectively (Fig. 4d).2.4. Compositional stabilityAfter the CO oxidation durability tests, the elemental composition of Au/Pd/gC3N4NFs was carriedout using the EDX analysis to examine any changes in the composition. Fig. 5 shows the EDX analysis ofAu/Pd/gC3N4NFs, which revealed the presence of C, N, Au, and Pd without any changes or undesiredphases. The detailed atomic ratios of C/N/Au/Pd are about with 39/60/0.51/0.44, respectively.Chemically speaking, and looking deeply to the formation mechanism, Au/Pd/gC3N4NFs combinebetween the unique physicochemical properties of gC3N4 and catalytic merts of Au/Pd atomic dopants[1e4,12e15]. Particularly, the strong binding affinity between N-atoms of melamine and metal atomsAu/Pd led to their chemical bonding in the form of -N-Au and -N-Pd during the polymerization stepresulting in a coherent distribution through the skeletal structure of gC3N4NFs (Fig. 6) [1e4]. Thesechemical legends not only allow the homogenous distribution of Au/Pd inside the nanofibers but alsostabilize them against the detachment and agglomeration, during the CO oxidation reaction.AcknowledgmentsThis publication was supported by Qatar University Internal Grant No. IRCC-179. The findingsachieved herein are solely the responsibility of the authors.K. Eid et al. / Data in brief 27 (2019) 1047348Conflict of InterestThe authors declare that they have no known competing financial interests or personal relation-ships that could have appeared to influence the work reported in this paper.Appendix A. Supplementary dataSupplementary data to this article can be found online at https://doi.org/10.1016/j.dib.2019.104734.References[1] K. Eid, M.H. Sliem, A.S. Eldesoky, H. Al-Kandari, A.M. Abdullah, Rational synthesis of one-dimensional carbon nitride-basednanofibers atomically doped with Au/Pd for efficient carbon monoxide oxidation, Int. J. Hydrogen Energy 44 (2019)17943e17953.[2] K. Eid, A.M. Abdullah, Data on the catalytic CO oxidation and CO2 reduction durability on gC3N4 nanotubes Co-dopedatomically with Pd and Cu, Data in Brief 26 (2019) 104495.[3] K. Eid, M.H. Sliem, H. Al-Kandari, M.A. Sharaf, A.M. Abdullah, Rational synthesis of porous graphitic-like carbon nitridenanotubes codoped with Au and Pd as an efficient catalyst for carbon monoxide oxidation, Langmuir 35 (2019)3421e3431.[4] Y. Fu, J. Zhu, C. Hu, X. Wu, X. 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Data on structural and composition-related merits of gC3N4 nanofibres doped and undoped with Au/Pd at the atomic level for efficient catalytic CO oxidation

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Data on structural and composition-related merits of gC3N4 nanofibres doped and undoped with Au/Pd at the atomic level for efficient catalytic CO oxidation

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