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Qian F.-B.,Ningbo University | Wang L.,Ningbo University | Shen J.-Y.,Ningbo University | Fu J.-L.,Ningbo University | And 2 more authors.
Chinese Rare Earths | Year: 2014

In order to research the regulation among A and B on the catalytic activity of the nanoperovskite ABOI for NO + CO and the catalytic mechanism, perovskite type oxides ABOI(A=La, Y; B=Mn, Co, Ni ) were prepared by a citric acid sol-gel method and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and N2 physisorption (BET). The catalytic activity of the oxides for NO + CO was tested. The obtained results indicated that the activity of catalysts for CO is in the order of LaNiOx > YCoOx > YNiOx > YMnOx > LaCoOx > LaMnOx and that for NO is in the order of LaNiOx > YCoOx > YNiOx > LaCoOx > YMnOx > LaMnOx. LaNiOx exhibits the best catalytic activity and complete conversion of CO and NO at 350°C. Valence state and d-electron number of B, specific surface area and the kind of oxygen in catalyst are the key factors influencing catalytic activity. Different A (La3+, Y3+) in catalysts with same B have great impact on catalytic activity through influencing lattice oxygen(OL) and valence of B. Source


Li T.H.,The State Key Laboratory Base of Novel Functional Materials and Preparation Science | Wang D.,The State Key Laboratory Base of Novel Functional Materials and Preparation Science | Lan H.Z.,The State Key Laboratory Base of Novel Functional Materials and Preparation Science | Gan N.,The State Key Laboratory Base of Novel Functional Materials and Preparation Science
Advanced Materials Research | Year: 2014

An electrochemical sensor for estradiol was prepared by a molecularly imprinted polymer (MIP) film and its recognition properties for estradiol were investigated. The polypyrrole (PPy) film was prepared by electropolymerizing pyrrole on gold nanoparticles (Au NPs) and graphene (Gs) modified glassy carbon (GC) electrode. The electrochemical response of 17β-Estradiol (17β-E2) at the imprinted PPy-Gs-Au/GC electrode was investigated by cyclic voltammetry. The results indicated that the imprinted PPy-Gs-Au/GC electrode can effectively improve the electrochemical signal of 17β-E2 and eliminate interferences of other interfering substances. The results showed that a wide detection linear range (3.0 × 10-9 - 1.0 × 10-6 mol L-1) for the determination of 17β-E2 with the low detection limit of 1.0 × 10-9 mol L-1 (S/N = 3) was obtained. The proposed sensor exhibited fast balance response time of 10 min, which is propitious to rapid detect 17β-E2 in real samples. The merits of the imprinted electrode suggested an attractive and broadly applicable way for developing the chemical sensor used for the estrogen detection. © (2014) Transrinted Tech Publications, Switzerland. Source


Shui M.,The State Key Laboratory Base of Novel Functional Materials and Preparation Science | Song Y.,The State Key Laboratory Base of Novel Functional Materials and Preparation Science | Wang Q.,The State Key Laboratory Base of Novel Functional Materials and Preparation Science | Ren Y.,The State Key Laboratory Base of Novel Functional Materials and Preparation Science
Asian Journal of Chemistry | Year: 2010

Titania based ceramics are promising materials for environmental sensors, high efficiency photocatalyst. Ion doping is an effective method to improve the properties by modifying their micro-structure and phase composition. In this study, pure TiO2, co-precipitation Fe3+-doped TiO2 and step-precipitation Fe3+-doped TiO2 are synthesized by means of TiCl4 hydrolyzation. Thermal analysis, TEM and X-ray diffraction are used to characterize the Fe3+-doped TiO2 powder. Micro-strain, crystallite size, phase content and cell parameters are calculated according to rietveld refinement software GSAS. The interaction mechanism of Fe3+ in crystal lattice of titanium dioxide and the crystal growth kinetics Fe3+-doped TiO2 are intensively investigated. Source

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