CeO2-TiO2 as a visible light active catalyst for the photoreduction of CO2 to methanol

Abdullah, Huda; Khan, Maksudur R.; Pudukudy, Manoj; Yaakob, Zahira; Ismail, Nur Aminatulmimi

doi:10.1016/s1002-0721(14)60540-8

Cited by 92 publications

(47 citation statements)

References 33 publications

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“…However, the study was limited under UV light irradiation study only. Our previous study reported that CeO 2 -TiO 2 showed a higher methanol yield than TiO 2 catalyst for CO 2 photocatalytic reduction under visible light irradiation [8]. This paper represents the extension of previous study by study the effect of ceria amount loading on characterization and CO 2 photocatalytic reduction to methanol under visible light irradiation.…”

Section: Introductionmentioning

confidence: 52%

“…The CeO 2 -TiO 2 powder was prepared based on our previous work [8]. In brief, firstly, CeO 2 nanoparticle slurry was prepared by dissolved required amount of (Ce (NO 3 ) 3 .6H 2 O) in 20% ethanol solution at 50 °C and subsequently, 3M (NH 4 OH) was added under stirring.…”

Section: Catalyst Preparationmentioning

confidence: 99%

“…The photoreduction of CO 2 was performed according to the procedure reported in our previous study [8]. In brief, 0.3 g catalyst powder was dispersed in the CO 2 aqueous solution.…”

Section: Photocatalytic Activitymentioning

confidence: 99%

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CeO2-TiO2 FOR PHOTOREDUCTION OF CO2 TO METHANOL UNDER VISIBLE LIGHT: EFFECT OF CERIA LOADING

Abdullah

Ismail

Yaakob³

et al. 2017

MJAS

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A visible light-driven photocatalyst, CeO 2 -TiO 2 catalyst with different ceria loading was synthesized by impregnation method between TiO 2 powder and cerium oxide nanoparticles slurry. The prepared catalyst samples were characterized by X-ray diffraction (XRD), surface area analysis, UV-vis absorption spectroscopy and photoluminescence spectroscopy (PL). The band gap of CeO 2 -TiO 2 catalyst was found to be 2.15 -2.4 eV. The band gap reduction clearly indicated the successful loading of CeO 2 on TiO 2 . The photocatalytic activity was determined by measuring the photoreduction of CO 2 to methanol in aqueous solution under visible light. The effect of cerium loading in the range of 1 to 5 wt% on the photocatalytic activity was studied and 2 wt% CeO 2 -TiO 2 was found to exhibit the maximum photoactivity of 18.6 µmol/g.catalyst after 6 hours irradiation. Results showed that the prepared photocatalyst is visible light active and may be used as effective catalyst in photoreduction of CO 2 to methanol.Keywords: metal oxide, photocatalyst, band gap, nanoparticles Abstrak Fotomangkin yang boleh diaplikasi di bawah radiasi cahaya nampak iaitu mangkin CeO 2 -TiO 2 yang berbeza muatan ceria telah disintesis dengan kaedah impregnasi serbuk titanium dioksida dengan mendakan partikel nano cerium dioksida. Ciri mangkin yang dihasilkan dikaji dengan menggunakan pembelauan sinar-X (XRD), analisis luas permukaan, UV-Vis spektrofotometer dan spektroskopi fotoluminesen (PL). Jurang tenaga mangkin CeO 2 -TiO 2 adalah di antara 2.15 eV hingga 2.4 eV. Pengurangan jurang tenaga jelas menunjukkan pemuatan CeO 2 ke atas TiO 2 telah berjaya. Aktiviti fotopemangkinan ditentukan melalui tindak balas penurunan gas karbon dioksida (CO 2 ) di dalam larutan akueus kepada metanol dan dijalankan di bawah radiasi cahaya nampak. Kesan pemuatan 1 hingga 5 peratus berat cerium ke atas TiO 2 terhadap aktiviti fotopemangkinan telah dikaji dan CeO 2 -TiO 2 dengan 2 peratus berat cerium didapati menunjukkan fotosensitiviti maksimum iaitu penghasilan 18.6 µmol/g.mangkin selepas 6 jam radiasi. Hasil kajian menunjukkan bahawa fotomangkin yang dihasilkan adalah aktif di bawah cahaya nampak dan dijangka efektif untuk penurunan CO 2 kepada metanol.Kata kunci: logam oksida, fotomangkin, jurang tenaga, partikel nano

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Section: Introductionmentioning

confidence: 52%

Section: Catalyst Preparationmentioning

confidence: 99%

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CeO2-TiO2 FOR PHOTOREDUCTION OF CO2 TO METHANOL UNDER VISIBLE LIGHT: EFFECT OF CERIA LOADING

Abdullah

Ismail

Yaakob³

et al. 2017

MJAS

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“…Figure 1 shows X-ray powder diffraction pattern of TiO2, CeO2-TiO2, and CeO2-TiO2-IL calcined at 400 °C for 2 h. served. It implies that addition of Ce and ionic liquid allows dispersion of Ce on TiO2 without altering the phase of TiO2 where anatase phase was stabilized to a level [16]. Smaller amount of Ce crystalline phase was observed due to little amount of Ce present in the sample and with the hike up to 10% of CeO2 in the sample, diffraction peaks of CeO2 is slowly visible [17].…”

Section: C6h15no2+16h2o2→6co2+22h2o+ Nh3mentioning

confidence: 98%

CeO2-TiO2 Photocatalyst: Ionic Liquid-Mediated Synthesis, Characterization, and Performance for Diisopropanolamine Visible Light Degradation

Sivalingam¹,

Kait²,

Wilfred³

2017

Bull. Chem. React. Eng. Catal.

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CeO2-TiO2 photocatalyst with Ce:Ti molar ratio of 1:9 was synthesized via co-precipitation method in the presence of 1-ethyl-3-methyl imidazolium octylsulfate, [EMIM][OctSO4] (CeO2-TiO2-IL). The ionic liquid acts as a templating agent for particle growth. The CeO2-TiO2 and TiO2 photocatalysts were also synthesized without any ionic liquid for comparison. Calcination was conducted on the as-synthesized materials at 400 ˚C for 2 h. The photocatalysts were characterized using diffuse reflectance UV-Vis spectroscopy (DR-UV-Vis), field emission scanning electron microscopy (FESEM), X-ray powder diffraction (XRD), and surface area and pore size analyzer (SAP). The presence of CeO2 has changed the optical property of TiO2. It has extended the absorption edge of TiO2 from UV to visible region. The calculated band gap energy decreased from 2.82 eV (TiO2) to 2.30 eV (CeO2-TiO2-IL). The FESEM morphology showed that samples forms aggregates and the surface smoothens when ionic liquid was added. The average crystallite size of TiO2, CeO2-TiO2, and CeO2-TiO2-IL were 20.8 nm, 5.5 nm, and 4 nm. In terms of performance, photodegradation of 1000 ppm of diisopropanolamine (DIPA) was conducted in the presence of hydrogen peroxide (H2O2) and visible light irradiation which was provided by a 500 W halogen lamp. The best performance was displayed by CeO2-TiO2-IL calcined at 400 ˚C. It was able to remove 82.0% DIPA and 54.8% COD after 6 h reaction.

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“…Among the various semiconductor photocatalyst materials, TiO 2 has been the most promising and widely used photocatalyst due to its unique optical property, strong oxidizing power, nontoxicity, low cost, and chemical stability [7]. However, the wide technological use of TiO 2 is impaired by its wide band-gap (3.2 eV), which only uses about 5% of the solar light [8,9], and the recombination of photogenerated electron-hole pairs is easy to happen. These drawbacks largely restrict its photocatalytic efficiency [10,11].…”

Section: Introductionmentioning

confidence: 99%

Degradation and Mineralization of Benzohydroxamic Acid by Synthesized Mesoporous La/TiO2

Luo

Wang

et al. 2016

IJERPH

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Rare earth element La-doped TiO2 (La/TiO2) was synthesized by the sol-gel method. Benzohydroxamic acid was used as the objective pollutant to investigate the photocatalytic activity of La/TiO2. The physicochemical properties of the prepared materials were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, UV-vis diffuse reflectance spectroscopy, specific surface area and porosity, scanning electron microscopy and transmission electron microscopy. As a result, the doping of La could inhibit the crystal growth of TiO2, increase its specific surface area and expand its response to visible light, thus improving its photocatalytic activity. La/TiO2 with the doping ratio of 0.75% calcined at 500 °C, showing the highest photocatalytic activity to degrade benzohydroxamic acid under the irradiation of 300 W mercury lamp. About 94.1% of benzohydroxamic acid with the original concentration at 30 mg·L−1 was removed after 120 min in a solution of pH 4.4 with an La/TiO2 amount of 0.5 g·L−1. Furthermore, 88.5% of the total organic carbon was eliminated after 120 min irradiation. In addition, after four recycling runs, La/TiO2 still kept high photocatalytic activity on the photodegradation of benzohydroxamic acid. The interfacial charge transfer processes were also hypothesized.

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CeO2-TiO2 as a visible light active catalyst for the photoreduction of CO2 to methanol

Cited by 92 publications

References 33 publications

CeO2-TiO2 FOR PHOTOREDUCTION OF CO2 TO METHANOL UNDER VISIBLE LIGHT: EFFECT OF CERIA LOADING

CeO2-TiO2 FOR PHOTOREDUCTION OF CO2 TO METHANOL UNDER VISIBLE LIGHT: EFFECT OF CERIA LOADING

CeO2-TiO2 Photocatalyst: Ionic Liquid-Mediated Synthesis, Characterization, and Performance for Diisopropanolamine Visible Light Degradation

Degradation and Mineralization of Benzohydroxamic Acid by Synthesized Mesoporous La/TiO2

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