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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.
Catalytic activity evaluation of mesoporous a-GaOOH microspheres self-assembly
M. Muruganandham,Rominder Suri,Mika Sillanpaa,Bashir Ahmmad,Gang-Juan Lee,Jerry J. Wu 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.26 No.-
The mesoporous a-GaOOH was synthesized using oxalic acid in a hydrothermal process at various hydrothermal temperatures and times. The nitrogen adsorption analysis indicated that a-GaOOH with surface areas ranging from 6 to 87 m2/g and pore sizes from 3.8 to 7.2 nm can be prepared by adjusting the experimental conditions. The photocatalytic hexavalent chromium reduction was studied under UV light irradiation and the results showed that a-GaOOH having higher surface area owned higher photocatalytic activity. The degradation of 2-ethoxy ethyl acetate in catalytic ozonation process showed that the degradation was enhanced over ozonation process in the presence of mesoporous a-GaOOH
Wen-Min Wang,Shi-Jer Tseng,Yu-Shuan Huang,Qian-Yuan Wu,Wen-Long Wang,Jerry J. Wu 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.119 No.-
Nitrate pollution in wastewater has posed a threat to human health and the environment. Photocatalyticreduction is a promising technology to remove nitrate due to its high adaptability, low cost, and high efficiency. However, there is a great challenge to design photocatalyst with high nitrate reduction and highselectivity of nitrogen (N2) yield. In this study, a novel hollow-structured Pd/TiO2 (PHT1) photocatalyst issynthesized with large specific surface area (SBET) and pore volume, strong UV adsorption, high reductionpotential than nitrate to nitrite, high charge transfer rate, and low electron-hole recombination rate. PHT1 exhibits a superior photocatalytic activity on the removal of methyl orange and nitrate. In addition,PHT1 exhibits high N2 selectivity (>95 %). A lower pH can promote the reduction of nitrate and the selectivityof N2 by PHT1. Electrons (e-) and CO2– are the main active species for nitrate reduction with OH asauxiliary radicals. Three main pathways for nitrate reduction are proposed: i) the reaction with formicacid under acidic conditions; ii) the reduction by electrons and the loaded Pd of photocatalyst to captureelectrons to inhibit electron-hole recombination; iii) the reduction by CO2 – generated from formic acidoxidation by OH.