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He C.,Sun Yat Sen University | Shu D.,Power Generation in Guangdong Universities | Su M.,Sun Yat Sen University | Xia D.,Sun Yat Sen University | And 3 more authors.
Desalination | Year: 2010

A series of metal (Pt, Ag, and Cu)-deposited TiO2 films with nanocrystalline structure was prepared. Compared with TiO2 film, the degradation efficiency of formic acid for the metal-deposited TiO2 films was significantly higher in both photocatalytic (PC) and photoelectrocatalytic (PEC) processes, the enhanced order in PC and PEC activity for the metal-deposited film is Pt-TiO2 > Ag-TiO2 > Cu-TiO2. However, the electrochemical dissolution of deposited metals (Ag, and Cu) on TiO2 film would be a technical problem in PEC processes, an alternate PC and PEC processes intermittently provide a positive approach to maintain deposited metals (Ag, and Cu) on the TiO2 films well. © 2009 Elsevier B.V. All rights reserved.

Shao J.,Power Generation in Guangdong Universities | Sun T.,South China Normal University | Ji S.,Power Generation in Guangdong Universities | Li H.,Power Generation in Guangdong Universities | And 2 more authors.
Chemical Physics Letters | Year: 2010

A new method for luminescence detection of [Ru(bpy)2tatp]2+-based thin layer (where bpy = 2,2′-bipyridine, tatp = 1,4,8,9-tetra-aza-triphenylene) on a polyaniline (PANI)/ITO electrode in the absence and presence of herring sperm DNA tuned by applied electrode potentials has been developed under the excitation of CW green laser. It is found that the DNA-[Ru(bpy)2tatp]2+ conjugates are formed either in solution or on the PANI/ITO surface, exhibiting an effective enhancement in the luminescence by DNA. More interestingly, the application of anodic potentials significantly enhances the emission intensities of both [Ru(bpy)2tatp]2+ and DNA-[Ru(bpy)2tatp]2+ conjugates on the PANI/ITO surface excited with green laser. © 2010 Elsevier B.V. All rights reserved.

Chen M.,Power Generation in Guangdong Universities | Li H.,Power Generation in Guangdong Universities | Li Q.,Power Generation in Guangdong Universities | Xu Z.,Power Generation in Guangdong Universities
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2010

The luminescence properties of [Ru(bpy)2MDHIP]2+ (bpy = 2,2′-bipyridine, MDHIP = 2,4-dihydrophenyl-imidazo[4,5-f][1,10]phenanthroline) in the absence and presence of DNA modulated by the introduction of Cu2+ ion and EDTA have been investigated. It is found that the ruthenium(II) complex can insert and stack between the base pairs of calf thymus DNA with MDHIP ligand, and the intramolecular hydrogen bond is located inside of the DNA. The presence of DNA can enhance the luminescence intensities of [Ru(bpy)2MDHIP]2+ both in buffer solution and on an ITO surface. Moreover, the luminescence intensities of [Ru(bpy)2MDHIP]2+ and DNA-bound [Ru(bpy)2MDHIP]2+ are quenched by Cu2+, and next recovered by the addition of EDTA. The repetitive luminescence-modulations have been achieved through the introduction of equimolar Cu2+ and EDTA, respectively. In addition, it becomes evident that the number of luminescence-modulation cycles for [Ru(bpy)2MDHIP]2+ in the absence and presence of DNA is influenced by the cumulative concentrations of CuEDTA, generated successively by the strong coordination of Cu2+ to EDTA. © 2010 Elsevier B.V. All rights reserved.

Rao M.M.,South China Normal University | Liu J.S.,South China University of Technology | Li W.S.,South China Normal University | Liao Y.H.,South China Normal University | And 3 more authors.
Journal of Solid State Electrochemistry | Year: 2010

Nano-Al 2O 3 was doped in poly(acrylonitrile-co-methyl methacrylate) (P(AN-co-MMA)), and polyethylene(PE)-supported P(AN-co-MMA)/nano-Al 2O 3 microporous composite polymer electrolyte (MCPE) was prepared. The performances of the prepared MCPE for lithium ion battery use, including ionic conductivity, electrochemical stability, interfacial compatibility, and cyclic stability, were studied by scanning electron spectroscopy, linear sweep voltammetry, and electrochemical impedance spectroscopy. It is found that the nano-Al 2O 3 significantly affects the MCPE performances. Compared to the MCPE without any nano-Al 2O 3, the MCPE with 10 wt.% nano-Al 2O 3 reaches its best performances. Its ionic conductivity is improved from 2.0×10 -3 to 3.2×10 -3 S cm -1, its decomposition potential is enhanced from 5.5 to 5.7 V (vs Li/Li +), and its interfacial resistance on lithium is reduced from 520 to 160 Ω cm 2. Thus, the battery performance is improved. © 2009 Springer-Verlag.

Li J.,South China Normal University | Sun F.,South China Normal University | Sun F.,Power Generation in Guangdong Universities | Gu K.,South China Normal University | And 4 more authors.
Applied Catalysis A: General | Year: 2011

Spindly cupric oxide (CuO) micro-particles were synthesized using Cu(NO3)2, hexamethylenetetramine, and NaOH solutions at 95 °C. The spindly CuO particles had a shape similar to a carambola of ∼1 μm in length and 300 nm in width. They were composed of nanosheets with a thickness of ∼5 nm. Such particles could be used in the photocatalytic degradation of rhodamine B in the presence of ∼0.01 M H2O 2. Under irradiation by a 100 W halogen tungsten lamp, the CuO showed photocatalytic activities higher than those of P25 and commercially available CuO powder. They were very stable and could be recycled without considerable loss of activity. Other dye and organic pollutants such as methyl orange, methylene blue, erosin B, and p-nitrophenol could also be photodecomposed under identical conditions. These characteristics show the practical applications of the CuO particles in environmental remediation. © 2011 Elsevier B.V.

Peng G.,Power Generation in Guangdong Universities | Ma L.,Power Generation in Guangdong Universities | Liu B.,Power Generation in Guangdong Universities | Cai J.-B.,Power Generation in Guangdong Universities | Deng H.,Power Generation in Guangdong Universities
Inorganic Chemistry Communications | Year: 2010

Three novel Ln(III)-Cu(I) coordination polymers, namely [LnCu(Hbic)3(ox)0.5] [Ln = Sm (1), Dy (2), Hbic = benzimidazole-5-carboxylate, ox = oxalate] and [EuCu(Hbic)2(ox)H2O]·2H2O (3) have been hydrothermally synthesized and stucturally characterized. Both complexes 1 and 2 display the same unusual 2D layer heterometallic coordination frameworks that are built up by dimeric [Ln2(Hbic)6] cores and oxalate ligands by sharing Cu(I) ions. Complex 3 represents 1D polymeric chain architecture constructed from Eu2Cu2 ring units and oxalate ligands. Furthermore, the luminescent property of complex 3 has also been investigated. © 2010 Elsevier B.V. All rights reserved.

Lu D.-s.,South China Normal University | Lu D.-s.,Power Generation in Guangdong Universities | Li W.-s.,South China Normal University | Li W.-s.,Power Generation in Guangdong Universities | And 2 more authors.
Electrochemistry Communications | Year: 2010

The effect 8-hydroxyquinoline (8-HQ) additive in electrolyte on the cyclic stability of Co-B alloy electrode was investigated at elevated temperature (55 °C). Charge-discharge measurements show that 8-HQ can drastically enhance the cycle life of Co-B alloy electrode. Specifically, in the electrolyte containing 0.028 M 8-HQ additive, the discharge capacity of Co-B alloy electrode after 100 cycles are still up to 385.8 mAh/g at 55 °C. However, for the electrode in 8-HQ-free electrolyte, its discharge capacity is sharply decreased to only 138.5 mAh/g after 100 cycles. ICP-OES, XRD and ATR/FT-IR measurements were used to clarify the reason of the improvement in the cyclic stability. These results show that beneficial effect of 8-HQ on cycle life of Co-B alloy electrode can be attributed to the formation of insoluble complex (8-HQ)2Co(II)·2H2O protective layer that can suppress the dissolution of Co(OH)2 into electrolyte at elevated temperature. © 2009 Elsevier B.V. All rights reserved.

Chen Y.-N.,Power Generation in Guangdong Universities | Ge Y.-Y.,Power Generation in Guangdong Universities | Zhou W.,Power Generation in Guangdong Universities | Ye L.-F.,Power Generation in Guangdong Universities | And 5 more authors.
Inorganic Chemistry Communications | Year: 2011

One new heterometallic dinuclear Schiff-base complex Mn(DMF) 2Zn(salpn)Cl2 (1) (H2salpn = N,N′-bis(salicylidene)-1,3-diaminopropane) has been successfully constructed by the solvothermal reaction of Mn(ClO4)2, ZnCl2 and H2salpn, and characterized by element analysis, IR spectroscopy and thermal analysis, as well as single crystal X-ray diffraction. The result reveals that compound 1 is heterodinuclear with Mn 2+ and Zn2+ centers, in which they respectively present octahedral and tetrahedral coordination geometries. Each neutral molecule unit [Mn(DMF)2Zn(salpn)Cl2] is further connected by four intermolecular hydrogen bonding CH⋯Cl and two CH⋯O interactions from six adjacent units to form a three-dimensional supramolecular network with pcu α-Po 412· 63 topology. Moreover, luminescence, antifungal and antimicrobial activities of the heteronuclear compound 1 have also been investigated. © 2011 Elsevier B.V. All rights reserved.

Zhang J.,Power Generation in Guangdong Universities | Xiao X.,Power Generation in Guangdong Universities | Nan J.,Power Generation in Guangdong Universities
Journal of Hazardous Materials | Year: 2010

Tri-phase (anatase, rutile, and brookite), bi-phase (anatase and rutile), and mono-phase (rutile) TiO2 nanomaterials with different morphologies were successively synthesized using a hydrothermal-hydrolysis method and adjusting the Ti4+/Ti3+ molar ratio in a precursor solution. The properties of the fabricated nanomaterials were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), photocatalytic reaction, and other techniques. It has been shown that TiO2 nanorods can be obtained by increasing the Ti4+/Ti3+ molar ratio in a precursor solution from 1:0 to 0.3:0.7. TiO2 nanoparticles are formed if the Ti3+ fraction in the solution is further increased. The selective synthesis of TiO2 nanomaterials is explained by a decrease in the reaction rate and by changes in acidity with increasing Ti3+ content. The tri-phase nanorods and bi-phase nanoparticles synthesized with Ti4+/Ti3+ molar ratios from 1:0 to 0.8:0.2 and 0.2:0.8 to 0:1, respectively, have a higher degradation ability with respect to methylene blue aqueous solutions under UV irradiation at ambient temperature compared to purely rutile TiO2 nanorods synthesized with Ti4+/Ti3+ molar ratios from 0.7:0.3 to 0.3:0.7. The high photocatalytic activity of the multi-phase TiO2 samples is primarily attributed to their larger band gap and suppressed recombination of photo-generated electron-hole pairs. © 2009 Elsevier B.V. All rights reserved.

Zhou P.,Power Generation in Guangdong Universities | He L.,Power Generation in Guangdong Universities | Gan G.,Power Generation in Guangdong Universities | Ni S.,Power Generation in Guangdong Universities | And 2 more authors.
Journal of Electroanalytical Chemistry | Year: 2012

A multiple sweep voltammetry is effectively applied to the electrochemical assembly of polypyridyl cobalt(III) complexes [Co(phen) 2(tatp)] 3+ and [Co(phen) 3] 3+ (where phen = 1,10-phenanthroline and tatp = 1,4,8,9-tetra-aza-triphenylene) on a glassy carbon electrode modified with DNA or sodium dodecyl sulfate (SDS)-dispersed multi-walled carbon nanotubes (MWCNTs). The DNA-MWCNTs and SDS-MWCNTs are found to impact redox reactions of [Co(phen) 2L] 3+ (L = phen or tatp) adsorbed on the electrode surfaces. The anionic surfactant (SDS) facilitates the adsorption of [Co(phen) 2L] 3+ on the MWCNT surfaces via a fully-packed π-π stacking mode. An excess amount of DNA as the dispersant attached to the surface of MWCNTs interferes with the π-π stacking between MWCNTs and [Co(phen) 2L] 3+, representing a DNA-bridged binding mode. Moreover, the DNA-MWCNT or SDS-MWCNT modified electrodes are suitable for the detection of 6-mercaptopurine (6-MP) using [Co(phen) 2(tatp)] 3+ as voltammetric probes. The proposed sensor exhibits a high selectivity to 6-MP (detection limit = 0.05 μM) and a good linear response in the range from 0.2 μM to 0.2 mM. © 2011 Elsevier B.V. All rights reserved.

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