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Fang D.,Yancheng Teachers University | Fang D.,Yancheng Normal University | Yang J.,Yancheng Normal University | Ni C.,Yancheng Normal University
Heteroatom Chemistry | Year: 2011

Some task-specific ionic liquids N,N,N′, N′-tetramethyl-N, N′-dipropanesulfonic acid ethylenediammonium hydrogen sulfate, N,N,N′,N′-tetramethyl-N,N′-dipropanesulfonic acid-1,3-propanediammonium hydrogen sulfate, N,N,N′,N- tetramethyl-N, N′- dipropanesulfonic acid-1,6-hexanediammonium hydrogen sulfate were prepared. These ionic liquids could be used as efficient and recyclable catalysts for the synthesis of α-aminophosphonates at room temperature via an one-pot three-component reaction under organic solvent-free conditions with good yields of 83-96%. The postprocessing was simple, and the catalysts could be reused at least six times without noticeably decreasing the catalytic activity. The novel clean procedure offers the advantages including short reaction time, good yields, operational simplicity, and environmentally benign. © 2010 Wiley Periodicals, Inc.


Fang D.,Jiangsu Provincial Key Laboratory of Coast Wetland Bioresources Environment Protection | Fang D.,Yancheng Normal University | Jiao C.,Jiangsu Provincial Key Laboratory of Coast Wetland Bioresources Environment Protection | Ji B.,Yancheng Normal University
Phosphorus, Sulfur and Silicon and the Related Elements | Year: 2010

Some acyclic acidic ionic liquids were prepared and used as the catalysts for the one-pot, three-component synthesis of α-aminophosphonates from aldehydes, amines, and trimethylphosphite at room temperature in water. The products could simply be separated from the system of catalyst/water, and the catalysts could be reused at least six times without noticeably decreasing the catalytic activity. © Taylor & Francis Group, LLC.


Fang D.,Jiangsu Provincial Key Laboratory of Coast Wetland Bioresources and Environment Protection | Fang D.,Yancheng Normal University | Yang J.-M.,Jiangsu Provincial Key Laboratory of Coast Wetland Bioresources and Environment Protection | Liu Z.-L.,Yancheng Normal University
Journal of Heterocyclic Chemistry | Year: 2011

A biodegradable functionalized ionic liquid 3-(N,N-dimethyldodecylammonium) propanesulfonic acid hydrogen sulfate ([DDPA][HSO4]) was prepared and used as a Brønsted acid-surfactant-combined catalyst for the eco-friendly one-pot synthesis of 1,8-dioxo-octahydroxanthenes at 100°C in water. Under these conditions, the reaction of various aromatic aldehydes with dimedone generated 1,8-dioxo-octahydroxanthenes in good yields with a simple postreaction procedure. The products could simply be separated from the catalyst/water system, and the catalyst could be reused at least six times without noticeably decreasing the catalytic activity. © 2010 HeteroCorporation.


Yang J.,Yancheng Normal University | Jiang C.,Jiangsu Provincial Key Laboratory of Coast Wetland Bioresources and Environment Protection | Qian C.,Jiangsu Provincial Key Laboratory of Coast Wetland Bioresources and Environment Protection | Fang D.,Jiangsu Provincial Key Laboratory of Coast Wetland Bioresources and Environment Protection
Green Chemistry Letters and Reviews | Year: 2013

A clean and efficient procedure was established to synthesize 1,4-dihydropyridines via one-pot Hantzsch reactions in aqueous medium without the use of a catalyst and/or organic solvent. The reaction with stoichiometric molar ration could be carried out in a sealed vessel with a water steam, air, or nitrogen atmosphere to afford Hantzsch esters in good to excellent yields and purities. After the simple filtration, the 1,4-dihydropyridines were isolated, and the filtrate could be recycled and reused without significantly decreasing the yields and purities. The novel and clean methodology offers the advantages including short reaction time, good yields, operational simplicity, less leaks, and environmentally benign. © 2013 Copyright Jinming Yang, Chenning Jiang, Jiaojiao Yang, Cunwei Qian and Dong Fang Published by Taylor & Francis.


Fang D.,Jiangsu Provincial Key Laboratory of Coast Wetland Bioresources and Environment Protection | Fang D.,Yancheng Normal University | Yang J.,Yancheng Normal University | Jiao C.,Jiangsu Provincial Key Laboratory of Coast Wetland Bioresources and Environment Protection | Jiao C.,Yancheng Normal University
Catalysis Science and Technology | Year: 2011

A novel recyclable temperature-dependant phase-separation catalytic system comprised of PEG1000-based functional dicationic acidic ionic liquid and propylene glycol monomethyl ether was developed. This catalytic system could be used for the synthesis of 2,4,5-trisubstituted imidazoles via one-pot three-component condensation with various aldehydes, benzil and ammonium acetate in reasonable to good yield of 81-95%. The reaction was accomplished homogeneously at 70°C, while the products was separated from the catalyst system by liquid/liquid phasic-separation at room-temperature, and the catalyst could be reused at least eight times without significantly decreasing the catalytic activity. © 2011 The Royal Society of Chemistry.


Zhu H.X.,Nanjing University | Zhu H.X.,Yancheng Normal University | Liu J.-M.,Nanjing University
Computational Materials Science | Year: 2014

The electronic and optical properties of C, C-Nb and C-2Nb doped anatase TiO2 are studied using the first principles calculations. For the C-doped TiO2, three subbands in the band gap are generated due to the C-2p states, which suppress the effective band gap for electron transfer, while the gap states are partially occupied and probably serve as the recombination centers for electrons and holes. Therefore, the C-2Nb co-doping is investigated for the charge compensation consideration. Two possible co-doping configurations are comprehensively studied and compared. The three subbands in the band gap of the C mono-doped TiO2 become fully occupied because the two Nb atoms contribute sufficient electrons for compensation. Furthermore, the optical properties of the co-doped TiO2 and pure TiO2 are calculated. It is found that the optical absorption of the C-2Nb co-doped TiO2 extends its coverage over the visible light region. © 2013 Elsevier B.V. All rights reserved.


Sun L.,Yancheng Normal University | Sun C.,Jiaxing University | Sun X.,Changzhou University
Desalination and Water Treatment | Year: 2015

Abstract: The photocatalystic decolorization of the mixture of three textile azo dyes, i.e. Reactive Red (RR) 193, RR 198 and RR 239, with N, or Cr3+ or Fe3+doped TiO2 film photocatalysts under solar light irradiation was studied. The effect of different factors, i.e. concentration of dopant, pH of the solution, additive of H2O2 and irradiation source on the photocatalytic decolorization efficiency of the TiO2 film catalysts, was investigated. The optimal doping concentration is 0.2 at.% with N- or Cr3+, with larger than 96% of the decolorizing efficiencies after 4 h irradiation time. The decolorization of the dyes was strongly enhanced by the addition of hydrogen peroxide in the pH of 3.0. Under solar light irradiation in the presence of H2O2, both N-doped and Cr3+-doped TiO2 thin film were also applied to photocatalytically decolorize a textile wastewater sample. © 2014 Balaban Desalination Publications. All rights reserved.


Cui M.,Hefei University of Technology | Wu Y.,Yancheng Normal University | Ran J.,Hefei University of Technology | Xu T.,Hefei University of Technology
Desalination and Water Treatment | Year: 2015

Cation-exchange hybrid membranes have been prepared via the blending of sulfonated poly(2,6-dimethyl-1,4-phenylene oxide) (SPPO) with poly(vinyl alcohol) (PVA), which is cross-linked with multisilicon copolymer of poly(acrylic acid-co-γ-methacryloxypropyl trimethoxy silane) (poly(AA-co-γ-MPS)). The SPPO phase, PVA phase, and multisilicon copolymer can provide the membranes with functional groups of –SO3Na, –OH and –COOH, respectively. Hence, multi-functional groups are formed within the hybrid membranes. The hybrid membranes have a short-term thermal stability of 234–260°C, tensile strength (TS) of 12–13 MPa, and elongation at break of 27–49%. Membrane stability in alkaline solution is much affected by the content of SPPO. The membranes are potentially applied in diffusion dialysis (DD) for alkali recovery (NaOH/Na2WO4). The dialysis coefficients of NaOH (UOH) are in the range of 0.0075–0.032 m/h, which are higher than those of commercial membranes and reported membranes. The separation factor can reach up to 21.2 at 25°C for the membrane containing 10 wt% SPPO. Meanwhile, the membrane shows relative stability during long-term DD process. Hence, the multi-functional groups are effective for the diffusion dialysis process. © 2014, Balaban Desalination Publications. All rights reserved.


Fang D.,Jiangsu Provincial Key Laboratory of Coast Wetland Bioresources | Jiao C.,Yancheng Normal University | Ni C.,Yancheng Normal University
Heteroatom Chemistry | Year: 2010

SO3H-functionalized halogen-free ionic liquids were prepared and used as efficient and recyclable catalysts for the synthesis of α-aminophosphonates at room temperature via the one-pot three-component condensation reaction in aqueous media with good yields of 80-96%. The postprocessing was simple, and the catalysts could be reused at least six times without noticeably decreasing the catalytic activity. © 2010 Wiley Periodicals, Inc.


Fang D.,Yancheng Teachers College | Liu Z.-L.,Yancheng Normal University
Journal of Heterocyclic Chemistry | Year: 2010

Some recyclable acyclic SO3H-functionalized ionic liquids have been used as novel catalysts for the synthesis of 14-aryl-14H-dibenzo[a,j] xanthenes via the one-pot condensation of β-naphthol and aromatic aldehydes in aqueous medium. The condensation reaction was accomplished successfully with various aromatic aldehydes with good to excellent yields ranged from 86 to 96% within 5-30 min. After the reaction, the products could simply be separated from the catalysts by filtration. When separated from the reaction mixture, the catalysts could be recycled and reused for several times without noticeably reducing catalytic activity. The methodology gives the advantages of high yields, short reaction time, and easy work-up procedure. © 2010 HeteroCorporation.

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