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Facile Synthesis of Self-Assembled Biporous NiO and its Electrochemical Properties
M. Muruganandham,Rominder P.S. Suri,Mika Sillanpää,Gang-Juan Lee,Jerry J. Wu 대한금속·재료학회 2016 ELECTRONIC MATERIALS LETTERS Vol.12 No.5
In this article, we report the synthesis of self-assembled bi-porous nickeloxide on a large scale without using any templates or matrix. Porous NiOmicrospheres composed of particles were obtained by thermaldecomposition of nickel oxalate, which was prepared using nickel salt andoxalic acid as precursors. The as-obtained nickel oxalate and nickel oxidewere characterized using X-ray powder diffraction (XRD), ScanningElectron Microscopy (SEM), Transmission Electron Microscopy(TEM), X-ray Photoelectron Spectroscopy (XPS), thermogravimetricanalysis (TGA), and nitrogen adsorption-desorption analysis. Theinfluence of various experimental conditions on the formation nickeloxalate and NiO were studied. The nitrogen adsorption-desorptionanalysis showed that the synthesized NiO possesses a biporous (bothmesoporous and macroporous) surface structur. The NiO microspheresshowed a discharge capacity of 2929 mAh g−1. A plausible mechanism forthe NiO self-assembly was proposed.
Reza Darvishi Cheshmeh Soltani,Masumeh Mashayekhi,Alireza Khataee,Mohammad-Javad Ghanadzadeh,Mika Sillanpää 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.64 No.-
In the present study, amoxicillin (AMX) solution was treated by the combination of sonocatalysis (ultrasound/MgO nanoparticles) with electrolysis (Pt anode/graphite cathode). The reaction rate of the combined process (5.29 × 10−2 min−1) was over two orders of magnitude higher than that of the sonocatalysis (2.45 × 10−2 min−1). AMX was decomposed synergistically by the hybrid process (synergy percent of about 16%). On the basis of the applied mathematical modeling, an AMX removal efficiency (%) of more than 93% was achieved at Na2SO4 concentration of 0.13 M, current intensity of 0.04 A, MgO nanoparticles dosage of 1.8 g/L and AMX concentration of 11 mg/L.
Jalil Jaafari,Mohammad Ghanbari Ghozikali,Ali Azari,Mohammadbagher Delkhosh,Allah Bakhsh Javid,Ali Akbar Mohammadi,Shilpi Agarwal,Vinod Kumar Gupta,Mika Sillanpää,Alexey G. Tkachev,Alexander E. Burako 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.57 No.-
The development and design of adsorbents with high adsorption performance is an effective method of removing p-Cresol from effluent for environmental protection. Therefore, an Al2O3 coated multiwalled carbon nanotubes (MWNTs) composite for adsorption of p-Cresol from aqueous solution was synthesized. The p-Cresol concentration was determined by estimating the absorbance of the sample solution on a DR5000 UV/vis spectrophotometer. Box–Behanken design (BBD) was involved in the optimization of p-Cresol adsorption upon Al2O3 coated MWNTs adsorbent against the process parameters time, pH and adsorbent dose. The effects of these factors were studied in the ranges 5–40 min, 4–10, and 0.2–2 g L−1, respectively. The lack of fit obtained for this model was 0.357 which confirmed that the model is highly significant and the experiments are accurate and reliable. The results showed that adsorption isotherms fit well with the pseudo-second-order kinetic model and Langmuir isotherm model and Qmax was calculated to be 54.05 mg/g. Our results demonstrate that Al2O3 coated MWNTs has the potential to be used as an effective adsorbent for the rapid uptake of p-Cresol from aqueous solutions.
CdS microspheres composed of nanocrystals and their photocatalytic activity.
Rengaraj, Selvaraj,Jee, Sun Hee,Venkataraj, Selvaraj,Kim, Younghun,Vijayalakshmi, Selvaraj,Repo, Eveliina,Koistinen, Arto,Sillanp??, Mika American Scientific Publishers 2011 Journal of Nanoscience and Nanotechnology Vol.11 No.3
<P>A simple and template-free solution phase synthesis method has been developed for the preparation of novel CdS hollow microspheres using cadmium nitrate and thioacetamide precursors. In this manuscript, we demonstrate that process parameters such as the reaction time, precursor ratio, and reaction temperature strongly influence the morphology of the final product. The synthesized products have been characterized by a variety of methods, including X-ray powder diffraction (XRD), Raman spectroscopy, high-resolution scanning electron microscopy (HR-SEM), high-resolution transmission electron microscopy (HRTEM), energy-dispersive X-ray diffraction (EDX) analysis, X-ray photoelectron spectroscopy (XPS), and UV-visible diffused reflectance spectroscopy (UV-DRS). XRD analysis confirmed the cubic structure of the CdS microspheres, which has also been further supported by Raman spectroscopy. The HR-SEM measurements revealed the spherical morphology of the CdS microspheres which has been evolved by the oriented aggregation of the primary CdS nanocrystals. The TEM measurements confirmed the hollow shell-like structure of the spheres; the formation of their hollow interiors can be explained by the Ostwald ripening mechanism. UV-DRS studies showed that the band gap of the CdS microspheres increased with increasing cadmium-nitrate-to-thioacetamide ratio. Furthermore, studies of photocatalytic activity revealed that the synthesized CdS hollow microspheres exhibit an excellent photocatalytic performance in rapidly degrading methyl tert-butyl ether (MTBE) in aqueous solution under visible-light illumination. These results suggest that CdS microspheres will be an interesting candidate for photocatalytic detoxification studies under visible light radiation.</P>