•NiCeO2@f-MWCNT/EDA nanomaterials were synthesized by a facile method.•Various advanced analytical methods revealed the chemical composition of NiCeO2@f-MWCNT/EDA nanomaterials.•NiCeO2@f-MWCNT/EDA ...nanomaterials exhibited an excellent specific capacitance of 2385 Fg−1.
Metal oxide and carbon nanotube-based materials are widely preferred in supercapacitor and electrochemical sensor applications due to their interesting physicochemical structure. In this paper, we report the synthesis, characterization, and utilization of NiCeO2@f-MWCNT/EDA nanoparticles as electrode materials for supercapacitor applications. The characterization studies of NiCeO2@f-MWCNT/EDA nanomaterials were performed using X-ray diffraction (XRD), Transmission electron microscope (TEM), and Raman spectroscopy apparatus. The characterization methods revealed a good distribution of NiCeO2 on f-MWCNT/EDA and formed a new structure of NiCeO2@f-MWCNT/EDA nanoparticles. Electrochemical studies of NiCeO2@f-MWCNT/EDA nanoparticles showed a significant specific capacitance of between 2385 and 603 Fg−1 with good cyclic stability of 1000 cycles with capacity retention between 42% and 1.4% at 10 mV/s scan rate. The obtained results reveal that the prepared NiCeO2@f-MWCNT/EDA nanoparticles are promising electrode materials for supercapacitor devices.
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Reduced-graphene-oxide-supported Ni nanoadsorbents (Ni@rGO) were synthesized in this work to remove methylene blue (MB) dye from aqueous solutions using ultrasonic process method. These synthesized ...nanoadsorbents were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), Raman spectroscopy, N2 sorption, and X-ray photoelectron spectroscopy (XPS) apparatus. The effect of independent parameters (initial dye concentration, H2O2 concentration, adsorbent particle concentration, initial pH, contact time, and temperature were investigated) on dye removal efficiency with Ni@rGO nanoadsorbents. The zero charge points (pHzpc) of the Ni@rGO composite particles were determined by using experimental results. The max adsorption capacity (qemax) of the removal of methylene blue (MB) with Ni@rGO was determined as 946.12 mg g−1 as a result of experimental data under optimum conditions using ultrasonic process method. The experimental data obtained in the kinetic study concluded that the adsorption process was more consistent with the pseudo second-order model. Thermodynamic functions such as Gibbs free energy change (ΔG0), entropy change (ΔS0) and enthalpy change (ΔH0) values were investigated in order to get an idea about the working mechanism of MB as a result of adsorption interaction with Ni@rGO composite particles. As a result of all the data obtained Ni@rGO nanoadsorbent has proven to be an effective nanoadsorbent material to remove methylene blue from aqueous solution under different parameters in ultrasonic process systems.
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•Superior Ni nanoadsorbents were synthesized to remove MB dye from aqueous solutions.•The max adsorption capacity was determined as 946.12 mg g−1.•O2 radicals have an important function on dye removal efficiency.•Prepared nanoadsorbent was highly stable and efficient after five trials.
In this study, Fe
3
O
4
/Mn
3
O
4
/CuO nanoparticles were synthesized, characterized, and used as a nanocatalyst in methylene blue (MB) degradation under ultrasonic conditions. The synthesis of Fe
3
...O
4
/Mn
3
O
4
/CuO nanoparticles was carried out according to a facile method and characterized using some analytical techniques such as FTIR, scanning electron microscopy (SEM) with transmission electron microscopy (TEM), EDS, and X-ray diffraction (XRD). The obtained Fe
3
O
4
/Mn
3
O
4
/CuO nanoparticles showed a very homogeneous structure, and the average particle size was determined as 1.87 nm. XRD analyses revealed that Fe
3
O
4
/Mn
3
O
4
/CuO nanoparticles have a 2.27 nm crystalline particle size. The chemical composition of Fe
3
O
4
/Mn
3
O
4
/CuO nanoparticles was well detected by FTIR and SEM–EDS analyses. The products formed after the degradation of MB were detected by gas chromatography–mass spectrometry (GC–MS). The degradation of MB was investigated with several experimental conditions using Fe
3
O
4
/Mn
3
O
4
/CuO nanoparticles, and optimum experiment conditions were detected to be T = 301 K, MB = 0.03 g/L, Cat. = 1.0 g/L, H
2
O
2
= 5 mM, Ult. = 60 kHz. A maximum of 95.04% MB degradation using Fe
3
O
4
/Mn
3
O
4
/CuO nanoparticles was achieved in 150 min. To detect the radical effectiveness, t-butanol, ethanol, and t-butanol scavenger solvents were tested, and it was detected that these scavenger solvents prevent the formation of radicals that are effective in MB degradation. As a result, the present work paves the way to prepare excellent and highly efficient sonocatalysts for the degradation of organic dyes.
In this paper, we report graphene oxide (GO) supported Platinum(Pt)-Cobalt(Co) nanomaterials produced by a simple hydrothermal method after a series of water-ethanol treatments. To understand the ...change in chemical states, surface and crystal structure of the obtained Pt-Co@GO nanomaterials, X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, transmission electron microscopy (TEM), and X-ray diffraction (XRD) analyses were used. Pt-Co@GO nanomaterials exhibit a high adsorption effect in the methylene blue (MB) removal from the aqueous medium. The parameters including ultrasonic irradiation method contact time (1–90 min), initial dye concentration, temperature (293–323 K) and pH (4–10) were investigated for removal MB using Pt-Co@GO nano-adsorbent. The kinetic studies show that the MB adsorption processes can be described by pseudo-first-order, the pseudo-second-order model, and intraparticle diffusion. Thermodynamic activation functions including enthalpy change (ΔH0), Gibbs free energy change (ΔG0), and entropy change (ΔS0) were determined. The maximum adsorption capacity of the synthesized Pt-Co@GO nano-adsorbent reaches 273.6 mg/g under the condition that the pH 10, 318 K and the initial dye concentration is 3.0 × 10−5 M. It is understood from the obtained data, Pt-Co@GO nano-adsorbent has demonstrated to be an effective nano-adsorbent for removing MB under several parameters in aqueous solution by ultrasonic process systems.
•Pt-Co@GO nano-adsorbent has an extremely high potential for the removal of dyestuffs.•Pt-Co@GO nano-adsorbent exhibited superior catalytic activity and durability for the dye-removal.•The efficiency of absorbent, initial dye and H2O2 concentration, pH, and ultrasonic power were studied.•Reusability tests were performed under optimum conditions of synthesized nano-adsorbent.
Supercapacitors have gained great interest due to their high-power energy density, suitability for clean energy and energy storage applications. In this study, we used commercial multi-walled carbon ...nanotube (MWCNT), polypyrrole (PPy) and synthesized porous carbon (PC) from
Astragalus brachycalyx
plant as supporting materials to prepare Pt-NiO
x
/PPy-MWCNT and Pt-NiO
x
/PC electrodes by a straightforward method and tested their electrochemical properties for supercapacitor applications. X-ray diffractometer (XRD), scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS) were employed to characterize synthesized electrodes. The XRD results confirmed the composition and crystalline structure of related materials in the Pt-NiO
x
/PPy-MWCNT and Pt-NiO
x
/PC electrodes. While the MWCNT supporting materials with PPy exhibited filled rod like structure, PC supporting materials showed porous surfaces according to SEM images. The EDS analysis approved chemical composition of the Pt-NiO
x
/PPy-MWCNT and Pt-NiO
x
/PC depending on their ingredients. Cyclic voltammetry (CV) measurements were used to characterize capacitor behaviors of the electrode materials in a Swagelok-type cell. The Pt-NiO
x
/PPy-MWCNT and Pt-NiO
x
/PC materials displayed 252.36 F/g and 390.97 F/g capacitance values, respectively. The electrochemical experiments revealed that the synthesized materials can be used as energy storage electrode materials for supercapacitor applications.
Herein, multiwalled carbon nanotube-based Fe
O
nano-adsorbents (Fe
O
@MWCNT) were synthesized by ultrasonic reduction method. The synthesized nano-adsorbent (Fe
O
@MWCNT) exhibited efficient ...sonocatalytic activity to remove Maxilon Blue 5G, a textile dye, and present in a cationic form, in aqueous solution under ultrasonic irradiation. The magnetic nano-adsorbent particles were characterized by high-resolution transmission electron microscopy (HR-TEM), transmission electron microscopy (TEM), Raman spectroscopy and X-ray diffraction (XRD). Some important parameters such as nano-adsorbent dosage, solution pH, initial dye and H
O
concentration, reaction time, ultrasonic power and temperature were tested to determine the optimum conditions for the elimination of Maxilon Blue 5G dye. The reusability results showed that Fe
O
@MWCNT nano-adsorbent has a decrease of about 32.15% in the removal efficiency of Maxilon Blue 5G under ultrasonic irradiation after six times reuse. Additionally, in order to reveal the sufficient kinetic explanation, various experiments were performed at different temperatures and testing three kinetic models like the pseudo-first-order, pseudo-second-order and intraparticle diffusion for removal adsorption process of Maxilon Blue 5G using Fe
O
@MWCNT nano-adsorbent. The experimental kinetic results revealed that the adsorption process of Maxilon Blue 5G in the aquatic mediums using sono-Fenton method was found to be compatible with the intraparticle diffusion. Using kinetic models and studies, some activation parameters like enthalpy, entropy and Gibbs free energy for the adsorption process were calculated. The activation parameters indicated that Fe
O
@MWCNT nano-adsorbent could be used as an effective adsorbent for the removal of Maxilon Blue 5G as a textile dye and the adsorption process of Maxilon Blue 5G with Fe
O
@MWCNT nano-adsorbent is spontaneous.
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