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A Sb2Se3/Palygorskite Nanocomposite Catalyst for p-Nitrophenol Reduction
Lin Tan,Aidong Tang,Muen He,Xin Wen,Laifu Zhong,Peng Yan,Jing Chenc,Yi Zhang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.9
A nanocomposite consisting of rod-like Sb2Se3 and fiberous palygorskite (Pal) was prepared using cetyltrimethyl ammonium bromide (CTAB) as a pillaring agent to change Pal microstructure. CTAB optimal dosage was 0.2 g (versus 0.388 g of Pal). Sb2Se3/Pal has a high catalytic activity towards the catalytic reduction of p-nitrophenol to p-aminophenol while in the presence of NaBH4 at room temperature. The excellent performance is attributed to dispersion of rod-like Sb2Se3 in fiberous Pal which promoted more active sites exposure. The results provide new ideas for preparing new catalysts.
Wenrui Zhang,Aidong Tang,Dabin Ren,Hui Xiang,Zhiqiang Yu,Guoying Sheng,Jiamo Fu 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.5
The influence of structure of MnOx/TiO2 catalysts and their catalytic oxidation of o-dichlorobenzene were examined in this study. MnOx/TiO2 catalysts were characterized by X-ray diffractometer (XRD), thermogravimetry-differential thermal analysis (TG-DTA), TEM, X-ray photoelectron spectrum (XPS) and FTIR for NH3 adsorption techniques. Experimental results indicated that the MnOx/TiO2 catalyst prepared from manganese nitrate possessed the highest catalytic activity with a gas hourly space velocity (GHSV) of 14,500 h-1. This activity may be due to a large amount of surface Mn2O3 species, the strong Brönsted and Lewis acidity and the combined TiO2 phases. Additionally, a possible reaction model from o-dichlorobenzene oxidation over MnOx/TiO2 catalyst was suggested based on the analysis.
Synthesis of Nanoporous Materials Al-MCM-41 from Natural Halloysite
Yaling Xie,Aidong Tang,HUAMING YANG 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.1
Nanoporous materials Al-MCM-41 with varying Si/Al molar ratios have been successfully synthesized from natural clay mineral halloysite nanotubes (HNTs). Hydrothermal treatment of acid-pretreated HNTs and NaOH solution resulted in the one-step synthesis of final nanoporous products by using surfactant. The effects of Si/Al molar ratios (7.7, 61.0 and 176.5) on the surface area, porosity and degree of structural order of Al-MCM-41 materials have been investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM), N2 adsorption–desorption measurements and Fourier transform infrared (FTIR) spectra techniques. The results indicated that Si/Al molar ratio had important effect on the characteristics of nanoporous materials, and Al-MCM-41 with an intermediate Si/Al molar ratio of 61.0 exhibited excellent characteristics with high degree of order, high surface area (SBET) of 1033 m2 /g and pore volume of 0.92 mL/g.
Fabrication and Conductive Performance of Antimony-Doped Tin Oxide-Coated Halloysite Nanotubes
Huilin Lun,Jing Ouyang,Aidong Tang,Huaming Yang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.6
Antimony-doped tin oxide (ATO) was deposited on the surface of halloysite nanotubes (HNTs) to obtain conductive composite ATO/HNTs by a hydrolysis precipitation process. Structure and morphology of the samples were systematically characterized by X-ray diffraction (XRD), thermogravimetry – differential scanning calorimetry (TG – DSC), transmission electron micro-scope (TEM), energy-dispersive spectrometer (EDS) and Fourier transform infrared (FTIR) spectroscopy. The results indicated that ATO nanoparticles were successfully coated as thin layers on the surface of halloysite and the particle size was ~7.4 nm when calcined at 700℃. The ATO/HNTs composites were obtained with a resistivity of ~430Ω · cm under the optimum experimental parameters. ATO layers were proved to attach to the halloysite surface via the Sn–O–Si or Sn–O–Al bonds. A corresponding coating mechanism was depicted.