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Chen S.-L.,Guilin University of Technology | Liu Z.,Guilin University of Technology | Xia J.-H.,Guilin University of Electronic Technology | Li Y.-H.,Guangxi Key Laboratory of Environmental Engineering | Li Y.-H.,Guilin University of Technology
Journal of Coordination Chemistry

A zinc coordination polymer, {[ZnL(H 2O) 2] · 2(H 2O)(CH 3OH)}n (1) (H 2L = 4-(2-picolinylhy- drazide) methylene benzoic acid), consisting of a trapeziform chain was synthesized and characterized by elemental analysis, UV, IR, and single-crystal X-ray diffraction. Single-crystal structure of this compound reveals that the coordination geometry of zinc is a slightly distorted trigonal bipyramid and the trapeziform chains are further assembled into a 3-D network via hydrogen-bonding and π-π interactions. A water-methanol cluster, (H 2O) 8(CH 3OH) 2, is observed in this complex. The electronic absorption spectrum was attributed to intra-ligand electronic transitions. The spectrum of 1 indicates strong fluorescence at λ ex = 282 nm in the fluorescence spectrum at room temperature; the fluorescence gradually quenches with rising temperature. With increasing scan rate, the reversible redox process of Zn 2+/Zn + changes into a quasi-reversible one. © 2012 Taylor & Francis. Source

Zhou S.,Guangxi Normal University | Zhou S.,Guangxi Key Laboratory of Environmental Engineering | Zhou S.,Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection

A new species of the ant genus Pyramica Roger, i.e. P. nankunshana sp. nov., from Nankunshan National Forest Park, Guangdong Province is described. The new species resembles P. elegantula (Terayama et Kubota) but differs from the later by its cephalic dorsum with 3 pairs of long simple standing hairs in profile view, dorsum of pronotum with distinct transverse striations and without a median long stria, and disc of petiole with transverse rugae. It differs from P. lepiothrix Wheeler by its leading edge of scape without anteriorly projecting straight suberect simple hair, standing hairs on cephalic dorsum much less, dorsal surface of body without standing hairs. Source

Huang S.,Guangxi Key Laboratory of Environmental Engineering | Huang S.,Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection | Huang S.,Guangxi Normal University | Chen Y.,Guangxi Normal University
Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering

We have reported an investigation of the electrochemical catalytic performance of nanoporous gold. The nanoporous materials were prepared by an electrochemical alloying/de-alloying method in a non-aqueous 1 mol/L LiPF6 solution at room temperature. The electrochemical catalytic properties were then studied by cyclic voltammetry and chrono-amperometric measurements. The results show that the average ethanol oxidation currents on the nanoporous gold electrode reach 3.7 and 6.1 mA·cm-2 at 0 and 400 mV (vs SCE), respectively, in 0.5 mol/L KOH + 1.0 mol/L CH3CH2OH solution. These average currents are over 100 times higher than that of a polished gold electrode. The nanoporous gold materials demonstrate to possess highly stable electrochemical catalytical oxidation capability for ethanol. Copyright © 2015, Northwest Institute for Nonferrous Metal Research. Published by Elsevier BV. All rights reserved. Source

Yu L.,Guangxi Key Laboratory of Environmental Engineering | Yu L.,Guangxi University
Advanced Materials Research

Based on a modified Carrousel oxidation ditch process acclimated with synthetic wastewater, effect of SRT on nitrogen and phosphorus removal occurred in the system was investigated. The results indicated that SRT was prominent to nitrogen and phosphorus removal. The removal efficiency of nitrogen was better with SRT extension and that the removal efficiency of phosphorus was better with SRT shortness. With the operation conditions of water temperature 30°C, SRT 11days, the removal efficiency of TN and TP reached 85.4% and 74.9%, which indicated that nitrogen and phosphorus removals were best. Source

Jiang Z.,Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection | Qin H.,Guangxi Key Laboratory of Environmental Engineering | Liang A.,Guangxi Normal University
Chinese Journal of Chemistry

In the pH 7.4 Na 2HPO 4-NaH 2PO 4 buffer solution, the cationic surfactant (CS) interacted with nanogold particles (NG) to form NG aggregations (NGA) that resulted in its color changing from wine red to blue-violet. NG has a strong catalysis on the formic acid-phosphomolybdic acid (PMo) colored reaction, but that of the NGA catalysis is weak. With the increase of CS concentration, the NGA increased and the NG decreased, the catalysis decreased and the absorption value at 700 nm decreased linearly. The concentrations of 6.25-250 nmol/L tetradecyl dimethyl benzyl ammonium chloride (TDBAC), 0.625-250 nmol/L cetyltrimethyl ammonium bromide (CTMAB) and 12.5-500 nmol·L -1 dodecyldimethylbenzyl ammonium chloride (DDBAC) had good linear responses to the decreased absorption value (ΔA 700 nm), with molar absorption coefficients of 2.2 × 10 6, 2.1 × 10 6 and 9 × 10 5 L ·mol -1·cm -1 respectively. This method was simple, highly sensitive and low-cost. Copyright © 2012 SIOC, CAS, Shanghai & WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source

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