Single step fabrication of CuO–MnO–2TiO<sub>2</sub> composite thin films with improved photoelectrochemical response

Munawar, Khalid; Mansoor, Muhammad Adil; Basirun, Wan Jefrey; Misran, Misni; Huang, Nay Ming; Mazhar, Muhammad

doi:10.1039/c6ra28752b

Cited by 66 publications

(25 citation statements)

References 54 publications

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“…The interlayer distances increased in GO due to the intercalation of H 2 O molecules, hydroxyl, carboxyl, or epoxy groups. The characteristics peaks observed in IMGO at 2 θ = 35.81°, 40.73°, 44.12°, and 62.53° might be due to the formation of Fe 2 O 3 on the surface of GO while the diffraction peaks at 36.18° and 38.67° confirmed the formation of MnO on IMGO surface .…”

Section: Resultsmentioning

confidence: 88%

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Synthesis of magnetic iron‐manganese oxide coated graphene oxide and its application for adsorptive removal of basic dyes from aqueous solution: Isotherm, kinetics, and thermodynamic studies

Khan¹,

Shahjahan²,

Khan

2018

Env Prog and Sustain Energy

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Adsorptive removal of cationic dyes such as methyl violet (MV) and methyl green (MG) from aqueous solution using magnetic iron‐manganese oxide coated graphene oxide (IMGO) was examined. The IMGO was characterized using Fourier transform infrared spectroscopy, scanning electron microscopy, energy dispersive X‐ray spectroscopy, X‐ray diffraction (XRD), N2 adsorption–desorption isotherm, and vibrating sample magnetometer. The effect of different process parameters such as contact time, IMGO dose, initial dyes concentration, initial solutions pH, and temperature was investigated. The equilibrium experimental data were fitted with Langmuir, Freundlich, Dubinin–Radushkevich (D‐R), and Temkin isotherm models. The data fitted well with Freundlich isotherm model suggesting multilayer adsorption of dyes onto heterogeneous adsorbent surface. The Langmuir adsorption capacity (Qm, mg/g) of IMGO with MV and MG was 172.96 and 195.64, respectively. The data obeyed the pseudo‐second order kinetic model, and the mechanism of adsorption was controlled by both intra‐particle and liquid film diffusion models. The adsorption process was found to be spontaneous, endothermic, and physical in nature. The dye‐loaded IMGO was regenerated and used for at least four cycles without any substantial loss of its efficacy. The present adsorptive removal studies of MV and MG revealed that IMGO is an effective and efficient adsorbent for the removal of basic dyes from aquatic system. © 2018 American Institute of Chemical Engineers Environ Prog, 38: S214–S229, 2019

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Section: Resultsmentioning

confidence: 88%

“…This peak disappeared in GO and a new broad peak appeared at 11.62 with interlayer distance of 5.90 Å. The interlayer distances increased in GO due to the intercalation of H 2 [45].…”

Section: Characterization Of Imgo X-ray Diffractionmentioning

confidence: 94%

Synthesis of magnetic iron‐manganese oxide coated graphene oxide and its application for adsorptive removal of basic dyes from aqueous solution: Isotherm, kinetics, and thermodynamic studies

Khan¹,

Shahjahan²,

Khan

2018

Env Prog and Sustain Energy

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“…where A is constant = 4.83×10 21 (electronsm -3 K -3/2 ), E gap is the bandgap energy (eV), k is the Boltzmann constant, and T is the temperature (~303 K). For n-TiO 2 /p-NiO/GO, the value of It has been reported formerly that both NiO and CoO are p-type while TiO 2 is n-type semiconductor [15][16][17]. The bandgap of NiO, CoO, and TiO 2 are 2.6, 2.6 and 3.2 eV, respectively as shown in Table 1.…”

Section: Resultsmentioning

confidence: 87%

Nanocomposite of TiO2 @ Ni- or Co-doped graphene oxide for efficient photocatalytic water splitting

et al. 2019

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N ANOCOMPOSITES of TiO 2 @Ni-doped or Co-doped graphene oxide (GO) have been sucessfully prepared and are employed for photocatalytic water splitting. TEM images showed doted nanostructure and scattered-appearance of Co, Ni with and TiO 2 nanoparticles on GO sheet. The XRD patterns proved the existence of the crystal planes of Ni, Co and TiO 2 nanoparticles on GO. Moreover, the absorption spectrum of the prepared samples showed a better percentage of absorption of the visible light upon introducing NiO or CoO. EDX analysis results confirmed the presence of Co, C, O, and Ti elements in the sample. Interestingly, both n-TiO 2 /p-NiO/GO and n-TiO 2 /p-CoO/GO heterojunctions photocatalysts improved the photocatalytic activity for water splitting nonetheless with different mechanisms. The n-TiO 2 /p-NiO/ GO photocatalyst showed a higher hydrogen production rate of 0.3 mmole/min/g than that of n-TiO 2 /p-CoO/GO. The generated e/h pairs in the TiO 2 part of the catalyst is kept through the effect of the electric field formed by the p-NiO/n-TiO 2 heterojunction while Co presence narrows the bandgap and promotes both hydrogen evolution reactions at the conduction and valence band of heterojunctions.

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“…All the XRD peaks can be indexed as monoclinic crystal system of CuO 200), (-202), (020),(202),(022),(220), (004) respectively. [19][20][21] No other reflections were detected. These results indicate that the sample contains no impurities.…”

Section: Resultsmentioning

confidence: 97%

Optical, Magnetic and Adsorptive Properties of Prepared Copper(II) Oxide

Rahman

Islam

Hossain

2020

Dhaka Univ. J. Sci.

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We report the surface morphology, structural propertiesand surface characterization of copper(II) oxide by scanning electron microscope, energy dispersive X-ray spectroscopy, Fourier transformation infrared spectroscopy, attenuated total reflection infrared spectroscopy and X-ray diffraction. All the data of analysis were consistent with each other and bear the evidence for the purity of the prepared oxide. Kubelka-Munk (K-M) theory is used for the determination of direct band gap of the prepared oxide from UV-visible reflectance spectrum. The band gap value of the bulk material was found to be 4.15 0.05 eV from F(R) versus energy and (F(R) hv)n versus energy plots, with n=1/2 and n=2 Molar magnetic susceptibility and effective magnetic moment of the oxide are 3.393×10-4(cgs) and 0.895 BM respectively which suggest that the oxide is paramagnetic. Catalytic activity was investigated by the study of adsorption of brilliant red (BR) on the surface of prepared oxide in aqueous medium at room temperature. Adsorption isotherm shows that BR moleculesare adsorbed layer by layer on the surface of oxide. Study of the adsorption phenomenon in this work suggest that copper(II) oxide has significant adsorptive and catalytic property. Dhaka Univ. J. Sci. 68(1): 7-12, 2020 (January)

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Single step fabrication of CuO–MnO–2TiO₂ composite thin films with improved photoelectrochemical response

Abstract: CuO–MnO–2TiO2 composite thin film having a photocurrent density of 2.21 mA cm−2 at +0.7 V has been deposited from a homogeneous mixture of acetates of Cu and Mn and (Ti(O(CH2)3CH3)4) in the presence of trifluoroacetic acid in THF via AACVD at 550 °C.

Cited by 66 publications

References 54 publications

Synthesis of magnetic iron‐manganese oxide coated graphene oxide and its application for adsorptive removal of basic dyes from aqueous solution: Isotherm, kinetics, and thermodynamic studies

Synthesis of magnetic iron‐manganese oxide coated graphene oxide and its application for adsorptive removal of basic dyes from aqueous solution: Isotherm, kinetics, and thermodynamic studies

Nanocomposite of TiO2 @ Ni- or Co-doped graphene oxide for efficient photocatalytic water splitting

Optical, Magnetic and Adsorptive Properties of Prepared Copper(II) Oxide

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Single step fabrication of CuO–MnO–2TiO2 composite thin films with improved photoelectrochemical response

Abstract: CuO–MnO–2TiO2 composite thin film having a photocurrent density of 2.21 mA cm−2 at +0.7 V has been deposited from a homogeneous mixture of acetates of Cu and Mn and (Ti(O(CH2)3CH3)4) in the presence of trifluoroacetic acid in THF via AACVD at 550 °C.

Cited by 66 publications

References 54 publications

Synthesis of magnetic iron‐manganese oxide coated graphene oxide and its application for adsorptive removal of basic dyes from aqueous solution: Isotherm, kinetics, and thermodynamic studies

Synthesis of magnetic iron‐manganese oxide coated graphene oxide and its application for adsorptive removal of basic dyes from aqueous solution: Isotherm, kinetics, and thermodynamic studies

Nanocomposite of TiO2 @ Ni- or Co-doped graphene oxide for efficient photocatalytic water splitting

Optical, Magnetic and Adsorptive Properties of Prepared Copper(II) Oxide

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Single step fabrication of CuO–MnO–2TiO₂ composite thin films with improved photoelectrochemical response