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Wang R.-Y.,Zhengzhou University | Wu L.,Zhengzhou University | Yu Y.-H.,Zhengzhou University | Zhang X.-X.,Zhengzhou Water Supply Corporation | And 2 more authors.
Polyhedron | Year: 2012

Through natural evaporation of the reaction solutions of ZnX 2 (X = Cl -, CH 3COO - and SCN -) and the ligand 2,6-bis(pyridine-4-carboxamido)pyridine (L), three new coordination compounds, [Zn(L)(Cl) 2] n·nCH 3OH· nH 2O (1), [Zn(L)(CH 3COO) 2] 2 (2) and [Zn(L) 3(SCN) 2] n (3) have been obtained. In these zinc(II) complexes, ligand L displays various conformers and coordination modes to fabricate the helical chain of 1, the discrete dimer of 2 and the zigzag chain of 3, with the coordination number of Zn II varying from 4 for 1, 5 for 2 to 6 for 3. Through complementary amide hydrogen bonds, their structures are extended into chiral layers, 1D ribbons and a 3D supramolecular network, respectively. Interestingly, the coordination numbers of Zn II, as well as the molecular and supramolecular structures of the resulting coordination complexes, are obviously tuned with the X anion used. Additionally, the TGA of 1 and 2 as well as the fluorescence of the free ligand L and 1 were measured in the solid state. © 2012 Elsevier Ltd. All rights reserved.

Wu K.,Xi'an University of Architecture and Technology | Wu K.,CAS Research Center for Eco Environmental Sciences | Liu R.,CAS Research Center for Eco Environmental Sciences | Li T.,Zhengzhou Water Supply Corporation | And 3 more authors.
Chemical Engineering Journal | Year: 2013

This study investigated the elemental composition and distribution of the Fe-based backwashing sludge (FBBS), and studied its adsorption behaviors and mechanisms towards arsenite [As(III)]. The characterization results of EDS, XPS, and XRF corroborated that the valuable constituents within FBBS are ferric oxhydroxide (γ-FeOOH) and sulfate inter-layered Fe hydroxide [Fe(SO4)OH]. The zeta-potential results indicated a pHZPC value of 7.7. The adsorption equilibrium could be reached within 18h, and the kinetics data were well described by the Elovich and Power models due to the heterogeneous surfaces of FBBS. The isotherm experimental results suggested that the maximum adsorption amount of As(III) was around 59.7mg/g (initial As(III)=1-120mg/L, pH=7.0, T=25°C), which is higher than most of other low-cost adsorbents. The uptake of As(III) onto FBBS would increase with an increase in temperatures, inferring that it is an endothermic process. The optimal initial solution pH for As(III) removal was around pH 8.0. The release of sulfate from FBBS after As(III) adsorption implied the occurrence of ligand exchanges, while the mechanism of Fe(III) precipitation might be also involved. The spectra of FTIR and XPS revealed that the surface hydroxyl groups played an important role in the adsorption of As(III), and the oxidation state of As(III) was not changed. Moreover, phosphates (>1mM) could strongly inhibit the removal of As(III). The desorption results indicated that the release of As caused by alkali or phosphate eluent should be avoided for the scrutiny of waste landfill. © 2013 Elsevier B.V.

Zhao H.,Zhengzhou University | Zhang B.-G.,U.S. Center for Disease Control and Prevention | Zhang X.-X.,Zhengzhou Water Supply Corporation | Wang S.,Zhengzhou University | Wu B.-L.,Zhengzhou University
Synthesis and Reactivity in Inorganic, Metal-Organic and Nano-Metal Chemistry | Year: 2015

The homochiral coordination polymers of zinc(II) with D-camphoric acid (D-H2Cam) as bridges and 4′-p-tolyl-2,2′:6′,2″-terpyridine (ttpy) and 1,10-phenanthroline (phen) as accessorial terminal ligands, namely [Zn2(D-Cam)2(ttpy)2]n (I1) and [Zn2(D-Cam)2(phen)2]n (I2), have been synthesized and characterized by elemental analysis, IR, PXRD, and X-ray diffraction analysis. Both complexes have 1D homochiral coordination chains bridged by D-Cam. Interestingly, the coordination numbers of ZnII ions, the coordination modes of D-Cam, and the crystal structures in I1 and I2 vary with the accessorial ligands ttpy and phen used. Additionally, compounds I1 and I2 have stronger fluorescence and higher thermostability, indicating their potential utility in photoluminescent materials. Copyright © Taylor & Francis Group, LLC.

Wang L.,Henan University of Technology | Li X.,CAS Zhengzhou Research Institute | Li T.,Zhengzhou Water Supply Corporation
Applied Mechanics and Materials | Year: 2012

Arsenic is a toxic substance. It will bring detrimental effect to the health, when the arsenic content in water exceeds 10μg /L. For water containing arsenic, we use this control system to remove arsenic to ensure water quality. Arsenic removal in water production is with the characteristics such as time-varying, delay, nonlinear. The system uses a combining control strategy based on fuzzy control and conventional PID control. In the control process, the precise control and stability can be achieved by online modifying and improving the control rules. The results of experiments show that this method has rapid response, no overshoot and good robustness compared with the traditional controller. © (2012) Trans Tech Publications, Switzerland.

Hou Y.,Tongji University | Hou Y.,Zhengzhou Water Supply Corporation | Chu W.,Tongji University | Ma M.,Zhengzhou Water Supply Corporation
Journal of Environmental Sciences (China) | Year: 2012

This work investigated the formation of carbonaceous and nitrogenous disinfection by-products (C-DBPs, N-DBPs) upon chlorination of water samples collected from a surface water and a ground water treatment plant (SWTP and GWTP) where the conventional treatment processes, i.e., coagulation, sedimentation, and filtration were employed. Twenty DBPs, including four trihalomethanes, nine haloacetic acids, seven N-DBPs (dichloroacetamide, trichloroacetamide, dichloroacetonitrile, trichloroacetonitrile, bromochloroacetonitrile, dibromoacetonitrile and trichloronitromethane), and eight volatile chlorinated compounds (dichloromethane (DCM), 1,2-dichloroethane, tetrachloroethylene, chlorobenzene, 1,2-dichlorobenzene, 1,4-dichlorobenzene, 1,2,3-trichlorobenzene and 1,2,4-trichlorobenzene) were detected in the two WTPs. The concentrations of these contaminants were all below their corresponding maximum contamination levels (MCLs) regulated by the Standards for Drinking Water Quality of China (GB5749-2006) except for DCM (17.1 μg/L detected vs. 20 μg/L MCL). The SWTP had much higher concentrations of DBPs detected in the treated water as well as the DBP formation potentials tested in the filtered water than the GWTP, probably because more precursors (e.g., dissolved organic carbon, dissolved organic nitrogen) were present in the water source of the SWTP. © 2012 The Research Centre for Eco-Environmental Sciences, Chinese Academy of Sciences.

Wu W.,North China University of Water Conservancy and Electric Power | Wu W.,Zhengzhou Water Job Science and Technology Develops Ltd. | Wu X.,Zhengzhou Water Supply Corporation
ICCET 2010 - 2010 International Conference on Computer Engineering and Technology, Proceedings | Year: 2010

A kind of long-range and centralized automatic metering reading for water meter system is designed. The function of the GPRS network meter reading and the USB centralized meter reading are accomplished by the M23 GPRS module and the C8051F340 single chip micro-controller. The system is composed of water meter, data collector, concentrator and administer computer. The data of water consumption which will be converted into pulse signals are collected by the water meter, and these pulse signals are disposed by the data collector which can use RS-485 communication with concentrator, water user's machine can be controlled when the upper instructions are received by the way of controlling the electromotion valves. The Concentrator plays an important role in data transit and bus segregation. A USB interface is set up in the concentrator in order to avoid the failure of GPRS network, and the staff can copy the datas by computer or hand-written. The administer computer can manage the user's purchase of water and control the user's machine by sending specific instructions. © 2010 IEEE.

Yuan X.,Zhengzhou University | Zhang X.,Zhengzhou Water Supply Corporation | Zhao H.,Zhengzhou University | Liu L.,Zhengzhou University | Wu B.,Zhengzhou University
Crystal Growth and Design | Year: 2013

An acetate-functionalized purine-containing ligand, 2-(6-oxo-6,9-dihydro- 1H-purin-1-yl) acetic acid (H2L), and its six new one-three-dimensional (1-3D) coordination polymers, [La(HL)2(NO 3)(H2O)2]n (1), [Ce(HL) 2(NO3)(H2O)2]n (2), [Pb(HL)2(H2O)2]n (3), [Cd(HL) 2(H2O)2]n (4), [Cd(L)]n (5), and [Zn(L)]n (6), were synthesized and characterized. Single-crystal X-ray diffraction analyses reveal that the architectures of complexes 1-6 are built from the metal-organic helixes of ligands H 2L. The overall structures range from the double helical chains of 1 and 2, and the 2D helical networks of 3 and 4, to the 3D coordination polymers of 5 and 6, containing 2D homochiral layers based on 1D metal-organic helixes. In those meso compounds, ligands H2L display differently anionic states, bridge modes, and especially unsymmetrical configurations with the sharp distortion between the acetate and purin in favor of constructing helical assemblies as expected. The plentiful hydrogen-bonding sites and π···π interactions originating from the bioactive purin group of ligand H2L greatly contribute to the formation of helical structures and the structural dimension, showing an intriguing ability in the supramolecular assembly. At room temperature, complexes 1-6 exhibit solid-state photoluminescences, with their emission wavelengths and intensities varying according to the central metal ions and the coordination patterns of ligand H2L. Additionally, the thermostabilities of these new complexes have been discussed in detail. In particular, 3D polymers 5 and 6 have extra high thermostabilities and stronger blue emissions, indicating potential applications in photoluminescent materials. © 2013 American Chemical Society.

Wu D.,Zhengzhou University | Zhang X.,Zhengzhou Water Supply Corporation | Liu X.,Zhengzhou University | Niu Y.,Zhengzhou University
Synthesis and Reactivity in Inorganic, Metal-Organic and Nano-Metal Chemistry | Year: 2013

Five supramolecular compounds (BPP)[CdI4] 1, (BPP)[HgBr 4] 2, (BPP)[Hg(SCN)Br3] 3, (BPP)[ZnBr 0.32Cl0.68(NCS)3] 4, and (BPP)[Fe(CN) 6]·2.5H2O 5 (BPP = 1,3-bis(pyridinium) propane) were synthesized and characterized by IR spectrum and X-ray crystallography. The crystal structures of 1-3 show that they all crystallize in monoclinic systems with mononuclear tetrahalidometallate structure. Compound 4 crystallizes in triclinic system, space group P-1 in which three SCN- ions serve as bridging ligands to link one Zn(II) ions, giving rise to a approximate tetrahedron. Compound 5 crystallized in a monoclinic system and the Fe 2+ center resided in a slightly distorted octahedral environment and was six-coordinated by six SCN- ions. Copyright © Taylor & Francis Group, LLC 2013.

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