Synthesis and photocatalytic activity of mesoporous cerium doped TiO2 as visible light sensitive photocatalyst

Aman, Noor; Satapathy, P. K.; Mishra, Trilochan; Mahato, Manmatha; Das, Nigamananda

doi:10.1016/j.materresbull.2011.11.049

Cited by 67 publications

(37 citation statements)

References 22 publications

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“…For the synthesis of the photo-catalytic materials, we adapted a sol-gel technique that was initially developed by Aman et al, (12) and Ismail and Bahnemann (2). Titanium (IV) isopropoxide (TIP), purchased from Sigma-Aldrich (MW = 284.22, 97%) was used as TiO 2 precursor.…”

Section: Methodsmentioning

confidence: 99%

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Synthesis, Characterization, and Application of TiO2 Nanoparticles – Effect of pH Adjusted Solvent

Oseghe

Ndungu

Jonnalagadda

2015

Journal of Advanced Oxidation Technologies

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Abstract:TiO 2 nanoparticles were synthesized via the sol-gel method by varying the pH of the solvent used in the synthesis. The aim of the pH variation was to study its effect on the surface energy amongst other characteristics, and photocatalytic properties. The sol-gel method was adopted in the synthesis of TiO 2 nanoparticles and calcined in air at 400 °C at 2 °C/min. The as-prepared materials were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), N 2 sorption, Raman spectroscopy, fluorescence spectrometry, and electron spin resonance spectroscopy (ESR), surface energy analyser (SEA), vibrating sample magnetometer (VSM). Photocatalytic properties of the materials were evaluated by monitoring the decoloration of model dye, methylene blue (MB) under natural sunlight conditions. The as-prepared materials existed in the anatase phase with polycrystalline and paramagnetic properties. The amount of surface defects of the as-prepared materials correlated well with the crystal size. The highest dispersive surface energy, 89.17 mJ/m 2 exhibited by TB400, and the least dispersive energy of 49.67 mJ/m 2 by TN400 are attributed to their microporosity. The acid -base numbers show that the materials are amphoteric with more of the basic sites. The values of the acidity-basicity ratio confirm the effect of pH in the synthesis of TiO 2 . The photocatalytic activities of the as-prepared materials were in the order of TB400 > TN400 > TA400, attributed to their characteristic crystal sizes, and surface defects.

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Section: Methodsmentioning

confidence: 99%

“…In recent times, acid (low pH) has been used in slowing down this process for better structured materials (11,12) but have never considered its effect on surface free energy. Surface free energy of materials plays a vital role in understanding its adhesion/interfacial interaction properties.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization, and Application of TiO2 Nanoparticles – Effect of pH Adjusted Solvent

Oseghe

Ndungu

Jonnalagadda

2015

Journal of Advanced Oxidation Technologies

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“…Although this thermohydrolytic process is based on previous studies [113,114], this last calcination step was included to improve solid crystallinity and guarantee the primacy of anatase phase, very suitable in photocatalysis [74]. It is important to mention that calcination temperature was established taking into account that transition between anatase-rutile phases happens at temperature about 700 C [115,116].…”

Section: Particle Generation In Supercritical Fluidsmentioning

confidence: 99%

Greenhouse Effect Mitigation Through Photocatalytic Technology

Rincón

Camarillo

Martínez

et al. 2014

Environment, Energy and Climate Change I

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Climate change is one of the most critical issues facing the world. One of the pillars of the fight against this phenomenon is the mitigation of greenhouse gas (GHG) emissions, CO 2 in particular. Although many achievements have already been made in CO 2 capture and storage technologies, promising methods to convert waste streams concentrated in this gas into valuable products are currently under way. This chapter intends to describe one of them, the photocatalytic reduction of CO 2 to fuel products, that is, the reaction to produce fuel between the CO 2 molecules and a reducing agent (usually water), in the presence of a semiconductor material that provides electrons (e À ) and holes (h + ) when it is illuminated by light of appropriate energy. Moreover, if solar energy were employed as light source, this type of energy difficult to store could be transformed into liquid or gaseous fuels, useful in conventional power production systems. In this chapter, firstly, a wide review about photocatalysis fundamentals, photocatalysts, synthesis of particles in supercritical fluids, characterization techniques, photocatalytic reactors, etc., is carried out. Subsequently, previous results from the authors' research on this subject are shown. More specifically, the characteristics of photocatalysts synthesized in a supercritical medium to convert CO 2 into fuels are presented and discussed.

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“…It appearances that composites of ceria-titania have shown remarkable photocatalytic activity under visible light irradiation for water splitting and degradation of organic compounds due to its capability in adsorbing visible light and inhibit the photogenerated electron hole pairs recombination [5]. To the best of our knowledge, there are a few reports on ceria-titania for CO 2 photoreduction.…”

Section: Introductionmentioning

confidence: 99%

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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Synthesis and photocatalytic activity of mesoporous cerium doped TiO2 as visible light sensitive photocatalyst

Cited by 67 publications

References 22 publications

Synthesis, Characterization, and Application of TiO2 Nanoparticles – Effect of pH Adjusted Solvent

Synthesis, Characterization, and Application of TiO2 Nanoparticles – Effect of pH Adjusted Solvent

Greenhouse Effect Mitigation Through Photocatalytic Technology

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

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