Investigation on the synthesis and photocatalytic activity of activated carbon–cerium oxide (AC–CeO2) nanocomposite

Jayakumar, Gladstone Christopher; Irudayaraj, A. Albert; Raj, A. Dhayal

doi:10.1007/s00339-019-3044-4

Cited by 80 publications

(37 citation statements)

References 29 publications

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“…The peak at 854.3 cm −1 is because of enveloping of the phonon band of CeO 2 NPs. The broad peak at 633.5 cm −1 is due to the vibrational mode of O-Ce-O bonds [ 45 , 46 , 47 ].…”

Section: Resultsmentioning

confidence: 99%

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Fabrication of Reproducible and Selective Ammonia Vapor Sensor-Pellet of Polypyrrole/Cerium Oxide Nanocomposite for Prompt Detection at Room Temperature

et al. 2021

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Polypyrrole (PPy) and polypyrrole/cerium oxide nanocomposite (PPy/CeO2) were prepared by the chemical oxidative method in an aqueous medium using anhydrous ferric chloride (FeCl3) as an oxidant. The successful formulation of materials was confirmed by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and transmittance electron microscopy (TEM). A four-in-line probe device was used for studying DC electrical conductivity and ammonia vapor sensing properties of PPy and PPy/CeO2. The significant improvement in both the conductivity and sensing parameters of PPy/CeO2 compared to pristine PPy reveals some synergistic/electronic interaction between PPy and cerium oxide nanoparticles (CeO2 NPs) working at molecular levels. The initial conductivity (i.e., conductivity at room temperature) was found to be 0.152 Scm−1 and 1.295 Scm−1 for PPy and PPy/CeO2, respectively. Also, PPy/CeO2 showed much better conductivity retention than pristine PPy under both the isothermal and cyclic ageing conditions. Ammonia vapor sensing was carried out at different concentration (0.01, 0.03, 0.05, 0.1, 0.2, 0.3, 0.4, and 0.5 vol %). The sensing response of PPy/CeO2 varied with varying concentrations. At 0.5 vol % ammonia concentration, the % sensing response of PPy and PPy/CeO2 sensor was found to be 39.1% and 93.4%, respectively. The sensing efficiency of the PPy/CeO2 sensor was also evaluated at 0.4. 0.3, 0.2, 0.1, 0.05, 0.03, and 0.01 vol % ammonia concentration in terms of % sensing response, response/recovery time, reversibility, selectivity as well as stability at room temperature.

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“…The peak at 854.3 cm −1 is because of enveloping of the phonon band of CeO 2 NPs. The broad peak at 633.5 cm −1 is due to the vibrational mode of O-Ce-O bonds [ 45 , 46 , 47 ].…”

Section: Resultsmentioning

confidence: 99%

“…The XRD spectrum of CeO 2 NPs ( Figure 3 b) consists of several peaks at 2θ = 28.57°, 33.14°, 47.59°, 56.43°, 59.1°, and 69.56° which are related to the crystalline planes (111), (200), (220), (311) (222), and (400), respectively [ 45 , 46 , 47 ].…”

Section: Resultsmentioning

confidence: 99%

Fabrication of Reproducible and Selective Ammonia Vapor Sensor-Pellet of Polypyrrole/Cerium Oxide Nanocomposite for Prompt Detection at Room Temperature

et al. 2021

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“…Moreover, the vibration band at 850-400 cm − 1 is the characteristic of Ce-O bonds [18,44]. Although CSDCs were calcined at 800°C, the FT-IR spectra still show -OH vibration, carbon, and carbonate residues from burnt complexing agents that may be trapped along grain boundaries of nanoparticles during calcination.…”

Section: Ft-irmentioning

confidence: 99%

The Effect of Tartaric Acid and Citric Acid as a Complexing Agent on Defect Structure and Conductivity of Copper Samarium Co‐Doped Ceria Prepared by a Sol‐Gel Auto‐Combustion Method

Duangsa

Tangtrakarn

Mongkolkachit

et al. 2021

Advances in Materials Science and Engineering

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Copper samarium co-doped ceria (CSDC) (Cu0.01Sm0.19Ce0.80O2−δ) nanoparticles were synthesized via a sol-gel auto-combustion of metal nitrates without a complexing agent (DI) and with tartaric acid (TA) or citric acid (CA). The solid oxide formation of CSDC/DI corresponds to the endothermic stage, whereas that of CSDC/TA and CSDC/CA matches the exothermic stage caused by the decomposition of the metal cross-linking and carbon combustion. The cross-linking occurs more extensively in the CA case as more heat is released in CA than in the TA route. The as-synthesized morphology of CSDC/DI reveals both layered structures and small agglomerated particles, whereas CSDC/TA and CSDC/CA show dense xerogel and porous xerogel, respectively. The cubic fluorite structure for calcined CSDCs was confirmed by XRD. From Raman analysis, calcined CSDC/CA has the lowest amount of copper segregation and the highest relative total oxygen vacancy concentration [ V O • • ]total, whereas calcined CSDC/DI has the highest amount of copper segregation and the lowest [ V O • • ]total. For all samples, copper segregation promotes densification, albeit to varying degrees. The relative densities of CSDC/DI, CSDC/TA, and CSDC/CA pellets are 82.8 ± 2.4%, 95.5 ± 1.8%, and 97.8 ± 0.9%, respectively. The sintered CSDC/DI has the lowest density because some copper segregates and liquid copper in interparticle spaces could evaporate earlier than samples containing a complexing agent, whereas sintered CSDC/CA has the highest density because Cu could slowly diffuse from the Cu-Sm-Ce solid solution to grain boundary regions and then precipitate as CuO. The specific grain boundary conductivity is predominantly influenced by CuO along grain boundaries, which reduces specific grain boundary conductivity and increases the enthalpy of association (ΔHa) at 250–350°C; however, it rarely impacts total grain boundary conductivity at temperatures higher than 400°C. CSDC/CA has slightly higher total conductivity than CSDC/TA despite having more CuO segregation because it has higher density and V O • • .

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“…The peak that appeared at 1390.50 cm −1 in both NC2 and NC3 (absent in the NC1) might be due to the N-O stretching band of nitrates or the vibrations of the carbonate-like species formed through adsorption of carbon dioxide by the cerium oxide nanoparticles. Furthermore, the peak for the O-H bond vibration, clearly visible in NC3 (Figure 2c), might be due to unreacted sodium hydroxide or moisture absorbed by the NCs [12,13].…”

Section: Ftir Spectroscopymentioning

confidence: 99%

“…Moreover, the broadening of the peaks by increasing the cerium amount suggests reduction in the size of the nanocomposites. The size reduction might be helpful in gaining a better Brownian movement and ultimately, a better enzyme activity [12].…”

Section: Semmentioning

confidence: 99%

Evaluation of a New Cerium Oxide-Bismuth Oxide-Based Nanobiocomposite as a Biocatalyst for Biodiesel Production

et al. 2021

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Biodiesel is a promising renewable energy source that can be used together with other biofuels to help meet the growing energy needs of the rapidly increasing global population in an environmentally friendly way. In search for new and more efficient biodiesel production methods, this work reports on the synthesis and use of a novel biocatalyst that can function in a broader range of pH and temperature conditions, while producing high biodiesel yields from vegetable oils. Biodiesel was synthesized by transesterification of non-edible Eruca sativa oil using a lipase from Aspergillus niger that was immobilized on cerium oxide bismuth oxide nanoparticles. The synthesized nanoparticles were first grafted with polydopamine which facilitated the subsequent anchoring of the enzyme on the nanoparticle support. The enzyme activity, pH and temperature stability, and reusability of the immobilized lipase were superior to those of the free enzyme. Following response surface methodology optimization, the highest biodiesel yield of 90.6% was attained using 5 wt% biocatalyst, methanol to oil ratio of 6:1, reaction temperature of 40 °C, pH of 7, and reaction time of 60 h. The produced biodiesel was characterized by Fourier transform infrared spectroscopy and its fatty acid methyl ester composition was determined by gas chromatography-mass spectrometry. Erucic acid methyl ester was identified as the major component in biodiesel, with 47.7 wt% of the total fatty acid methyl esters content. The novel nanobiocatalyst (Bi2O3·CeO2@PDA@A.niger.Lipase) has the potential to produce high biodiesel yields from a variety of vegetable oils.

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Investigation on the synthesis and photocatalytic activity of activated carbon–cerium oxide (AC–CeO2) nanocomposite

Cited by 80 publications

References 29 publications

Fabrication of Reproducible and Selective Ammonia Vapor Sensor-Pellet of Polypyrrole/Cerium Oxide Nanocomposite for Prompt Detection at Room Temperature

Fabrication of Reproducible and Selective Ammonia Vapor Sensor-Pellet of Polypyrrole/Cerium Oxide Nanocomposite for Prompt Detection at Room Temperature

The Effect of Tartaric Acid and Citric Acid as a Complexing Agent on Defect Structure and Conductivity of Copper Samarium Co‐Doped Ceria Prepared by a Sol‐Gel Auto‐Combustion Method

Evaluation of a New Cerium Oxide-Bismuth Oxide-Based Nanobiocomposite as a Biocatalyst for Biodiesel Production

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