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Preparation of 3D ordered mesoporous anatase TiO2 and their photocatalytic activity

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Rare Metals 2019年第5期38卷 453-458页

作者： Hui-Li Tang Yu Ren Shun-Hang Wei Gang Liu Xiao-Xiang Xu Shanghai Research Institute of Materials Shanghai 200437China Clinical and Central Lab Putuo People's HospitalTongji University1291 Jiangning RoadShanghai 200060China Shanghai BDS Trading Consultancy Co.Ltd. Shanghai 200433China Shanghai Key Laboratory of Chemical Assessment and Sustainability Department of ChemistryTongji UniversityShanghai 200092China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of ScienceShenyang 110016China School of Materials Science and Engineering University of Science and Technology of China72 Wenhua RoadShenyang 110016China Department of Materials Engineering Huzhou UniversityHuzhou 313000China

Ordered crystalline mesoporous anatase titanium dioxides with different amounts of rutile were prepared by hard-template approaches using mesoporous silica(KIT-6)as the *** resulting mesoporous materials were characterized by powder X-ray diffraction(PXRD),transmission electron microscope(TEM),N2 adsorption and Raman *** mesoporous TiO2 has three-dimensional(3D)ordered mesostructures with large Brunauer–Emmett–Teller(BET)surface area and narrow pore size distribution(ca.5 nm).It was found that the level of rutile phase in the mesoporous titanium oxide was related to the SO4^2-concentration in the starting *** photocatalytic hydrogen production was evaluated and *** is found that low rutile content is beneficial for a high catalytic *** samples demonstrate a better activity than commercial P25.

关键词： Mesoporous Anatase Rutile Photocatalysis oxalic acid

Organic solvent-and phase transfer catalyst-free oxidation of cyclohexanol to cyclohexanone with dilute H_2O_2

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Chinese Science Bulletin 2002年第24期47卷 2060-2062页

作者： WEI Junfa, SHI Xianying, HE Diping & ZHANG MinSchool of Chemistry and Material Science, Shaanxi Normal University, Xi’an 710062, China School of Chemistry and Material Science Shaanxi Normal University Xi'an China

The oxidation of cyclohexanol to cyclohexanone with 30% aqueous hydrogen peroxide by using peroxotung-state complexes formed in situ from sodium tungstate di-hydrate and various bidentate organic ligands as the catalysts, without organic solvents, halide and phase transfer catalyst has been carried out. The influence of 13 ligands on the oxidation is investigated. The maximum yield of cyclohexanone is obtained when using 1,10-phenanthroline (96%) and oxalic acid (95%) as the ligand. Very high yields (around 90%) have also been obtained for the instances of using salicylic acid, 3,5-dibromosalicylic acid, and 8-hydro- xylquino-line as ligands. A research to improve the reaction condition using cheap oxalic acid as the ligand indicates that the optimum condition is that the reaction mixture with a molar ratio of cycohexanol:tungstate dihydrate:oxalic acid: 30% H2O2=100:2:2:120 was stirred at 85-90℃ for 12 h.

关键词： cyclohexanol hydrogen peroxide catalytic oxidation peroxotungstate oxalic acid.

Silver Nanoparticles: Green Route, Stability and Effect of Additives

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Journal of Biomaterials and Nanobiotechnology 2011年第4期2卷 390-399页

作者： Zaheer Khan Javed Ijaz Hussain Sunil Kumar Athar Adil Hashmi Maqsood Ahmad Malik Department of Chemistry Jamia Millia Islamia (Central University) Department of Chemistry Faculty of Science King Abdul Aziz University Department of Chemistry University of Delhi

Colloidal silver nanoparticles were prepared by reducing silver nitrate with oxalic acid in presence of cetyltrimethylammonium bromide (CTAB). The synthesized silver particles show an intense surface plasmon band in the visible region. The work reported in this paper describes the effect of concentration of various additives (NaCl, NaBr, NaNO3, Na2SO4 and NaH2PO4) and ammonia on the growth and stability of Ag-nanoparticles. In all the cases the rate decreases as the [electrolytes] or [ammonia] increases. The nature, polarizability and coordinating ability of the anions play vital roles for nucleus formation and the growth process, which subsequently form different size particles. Transmission electron microscopy, selected areas electron diffraction, and UV-visible spectroscopy have been employed to characterize Ag-nanoparticles. The effect of the following variables on the particle size and size distribution was investigated: the [oxalic acid], [CTAB] and [Ag+].The nanoparticles are stable in NaNO3 and NaH2PO4 solutions;but NaCl, NaBr and Na2SO4 causes their aggregation.

关键词： Silver Nanoparticles Stability oxalic Acid Additives Ammonia

QUANTUM CHEMICAL STUDY ON THE REARRANGEMENT FROM FORMIC ACID CATION TO DIHYDROXYMETHYLENE CATION

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Chinese Science Bulletin 1988年第7期33卷 571-574页

作者：于建国刘若庄 Quantum Chemistry Group Department of Chemistry Beijing Normal University

In the electronic-impact mass spectrum of formic acid, the formic acid cation [HCOOH].+ is one of the major fragment ions generated. The dihydroxymethylene cation [C（OH）2].+, which can be regarded as the enol form of formic acid cation, has already been observed in the mass spectrum of oxalic acid. The metastable peaks for the following

关键词： oxalic ACID metastable latter lying rearrangement symmetry Burgers generating neutral

Ex-factory Prices of Major Chemicals Quoted in Shanghai Zhongshan Chemical Market in April 2010

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China Chemical Reporter 2010年第9期21卷 37-39页

Reductive Acid Leaching of Low Grade Manganese Ores

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Geomaterials 2012年第4期2卷 70-72页

作者： Alok Prasad Das Sarpras Swain Shriyanka Panda Nilotpala Pradhan Lala Behari Sukla Centre of Biotechnology Siksha “O” Anusandhan University Bhubaneswar India Institute of Minerals and Materials Technology Bhubaneswar India

Manganese recoveries from low-grade ores using organic acids as reducing agents were investigated in the present work. The acid leaching potential of both oxalic acid and citric acid were estimated. Manganese leaching amount were measured by using standard manganese curve and estimated by titration method. Effects of various acid concentrations on leaching efficiency were studied. The observed result suggested prominent manganese recovery of 66% by oxalic acid at 2 M concentration whereas citric acid had less effect on leaching showing leaching percentage upto 40% in 6 days. Acid leaching of manganese ore with both the acids gave a comparative data stating that oxalic acid leached better than citric acid.

关键词： Low Grade Manganese ore oxalic Acid Citric Acid Leaching

Extraction of Rare Earth from K-rich Syenite Tailings

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矿物学报 2013年第S1期33卷 8-8页

作者： BAO Tingting YANG Jing MA Hongwen School of Materials Science and Technology China University of Geosciences

The application of K-rich nephline syenite ores would produce some tailings, which will cause many disadvantages such as more land occupation. In this research, an process was obtained to extract rare earth from the K-rich nephline syenite tailings of Gejiu, Yunnan province, China. This tailings mainly composed of K-feldspar, biotite, magnetite, andradite, nepheline and 0.1% rare earth. The chemical compositions are shown in Table 1.

关键词： K-rich syenite tailings rare earth extraction hydrochloric acid oxalic acid

LIYANG RARE EARTH GENERAL PLANT

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China Rare Earth Information 1992年第2期 4-4页

Located in the south of China,Liyang Rare Earth General Plantis bounded on Nanjing,Shanghaiand Hangzhou and enjoys the con-venience in both land and *** plant started its produc-tion in June,1987 and was enlarg-ed its... 详细信息

关键词： Hangzhou Nanjing facilities minerals yttrium oxalic