Yang F.,Northwest Normal University |
Sun S.,Northwest Normal University |
Chen X.,Northwest Normal University |
Chang Y.,Northwest Normal University |
And 6 more authors.
Applied Clay Science
Highly effective clay adsorbents of Mg-Al layered double hydroxides modified palygorskite were prepared from the mixture of metal salts, urea and palygorskite by the in situ hydrothermal crystallization method. The obtained adsorbents were characterized by FT-IR, TG, XRD and SEM/EDS. The adsorption performances were evaluated for the removal of Pb2+, Cu2+ and Ni2+ in the aqueous solution. The adsorption capacities of the three metal cations at variable pH, contact times and metal concentrations were determined by atomic adsorption spectrometry. The adsorption capacities of the three metal cations on Mg-Al layered double hydroxides modified palygorskite were higher than those of palygorskite and Mg-Al layered double hydroxides at the initial metal ion concentration of 100mg/L and initial pH of 5.0. The experimental data showed a good compliance with the Langmuir isotherm and the pseudo-second-order kinetic model. Taking advantage of the combined benefits of palygorskite and Mg-Al layered double hydroxides, the as-prepared adsorbents exhibit selective and fast rating adsorption for Pb2+. © 2016 Elsevier B.V. Source
Guan X.,Northwest Normal University |
Guan X.,Key Laboratory of Eco Environment Related Polymer Materials Ministry of Education |
Zhao Y.,Northwest Normal University |
Zhao Y.,Key Laboratory of Eco Environment Related Polymer Materials Ministry of Education |
And 3 more authors.
The environment-friendly and water-soluble polymer was prepared via ring-opening reaction between polyvinyl alcohol (PVA) and 3-epoxypropoxy fluorescein (EPF). Based on the quenching of fluorescence signals of PVA-EPF in the 520 nm wavelength and relative quenched intensity is good linear with the concentration of palladium II. A simple, rapid, sensitive, and specific detection method for palladium II is proposed. In comparison with traditionary methods, the present method is environment-friendly, stable, easy to operation, more water-soluble, and cheaper. The results suggested that PVA-EPF may offer potential as a reusable polymer sensor for palladium II ion in aqueous solution. © 2014 Copyright Taylor & Francis Group, LLC. Source
Wang X.-M.,Lanzhou University of Technology |
Ye H.-L.,Key Laboratory of Eco Environment Related Polymer Materials Ministry of Education |
Ye H.-L.,Northwest Normal University |
Qaun Z.-J.,Key Laboratory of Eco Environment Related Polymer Materials Ministry of Education |
And 3 more authors.
Research on Chemical Intermediates
A series of 1-aryl-1,2-dihydrobenzo[f]quinolin-3(4H)-one derivatives and 4-aryl-7,7-dimethyl-5-oxo-3,4,5,6,7,8-hexahydrocoumarin derivatives have been synthesized by one-pot multicomponent reaction of Meldrum's acid with benzaldehyde, naphthalene-2-amine, or cyclohexanedione in PEG-400. The method has the advantages of mild reaction conditions, good yields, and easy processing, and is environmentally benign. © 2012 Springer Science+Business Media B.V. Source