Tianjin Mainland Hydrogen Equipment Co.

Tianjin, China

Tianjin Mainland Hydrogen Equipment Co.

Tianjin, China
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Xu L.,Tianjin University | Xu L.,Tianjin Key Laboratory of Membrane Science and Desalination Technology | Zhang L.,Tianjin University | Zhang L.,Tianjin Key Laboratory of Membrane Science and Desalination Technology | And 2 more authors.
Journal of Membrane Science | Year: 2014

The research was conducted to study the independent impact of electro-catalytic oxidation on the nanofiltration (NF) performance during the separation of C.I. Acid Red 73 (AR 73) wastewater. Ti/SnO2-Sb2O3 electrode modified with rare element yttrium (Y) was successfully prepared by the sol-gel technology, and then it was used as an anode for the degradation of azo dye AR 73 coupling with NF. The electro-catalytic oxidation could be restrained by painting insulating varnish on the surface of anode. Through comparing the permeation flux with the case of not using insulating varnish, we could identify the independent impact of electro-catalytic oxidation in the coupling process. The influence of operating parameters, e.g., applied voltage, initial feed concentration, operating pressure and cross flow velocity on the electro-catalytic oxidation flux and energy consumption was investigated respectively. The results indicated that the accelerated lifetime of the Ti/SnO2-Sb2O3-Y electrode reached 4.1h, which was 9.1 times longer than that of the Ti/SnO2-Sb2O3 electrode, and the electro-catalytic oxidation flux was enhanced to a great extent by choosing appropriate operating conditions and the coupling process could energy-effectively treat AR 73 wastewater. © 2013 Elsevier B.V.


Xu L.,Tianjin University | Li W.,Tianjin University | You Y.,Tianjin University | Zhang S.,Tianjin Mainland Hydrogen Equipment Co. | Zhao Y.,Tianjin Mainland Hydrogen Equipment Co.
Frontiers of Chemical Science and Engineering | Year: 2013

The novel composite separators composed of polysulfone and zirconia were prepared by phase inversion precipitation technique. This technique allows pre-evaporation time and extraction temperature to be varied in order to obtain optimal performances of the separators. In order to evaluate practical applicability of those composite separators, a small-scale electrolysis experimental apparatus was used to investigate the changes of cell voltage, gas purity and separator stability. The results revealed a decreased cell voltage compared to the conventional asbestos separators, and the gas purity and separator stability met the requirements for industrial use. © 2013 Higher Education Press and Springer-Verlag Berlin Heidelberg.


Xu L.,Tianjin University | Xu L.,Tianjin Key Laboratory of Membrane Science and Desalination Technology | Li M.,Tianjin University | Li M.,Tianjin Key Laboratory of Membrane Science and Desalination Technology | Xu W.,Tianjin Mainland Hydrogen Equipment Co.
Electrochimica Acta | Year: 2015

Abstract Novel Ti/Cu-NRs/SnO2-Sb electrode modified by copper (Cu) nanorods was fabricated through anodic aluminum oxide (AAO) template assisted electrochemical deposition (ECD) for wastewater treatment. Scanning electron microscopy (SEM), energy dispersive X-ray (EDX), X-ray diffraction (XRD) and electrochemical methods such as linear sweep voltammetry (LSV), cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) were used to characterize the surface morphology, crystal structure and electrochemical performance of the electrodes. Acid dye AR 73 was selected as target pollutants to investigate the electro-catalyst behavior, and UV/vis spectroscopy was used to monitor the concentration changes with time. The results indicated that the presence of Cu nanorods on the Ti substrate promoted the electrodes' property obviously. Ti/Cu-NRs/SnO2-Sb anode possessed smaller charge transfer resistance and longer service life than Ti/SnO2-Sb anode. The oxygen evolution potential (OEP) of Ti/Cu-NRs/SnO2-Sb electrodes reach 2.17 V (vs. Ag/AgCl). Removal of pollutants and reaction rate were all promoted due to the introduction of Cu nanorods in the process of AR 73 decomposing with Ti/Cu-NRs/SnO2-Sb electrodes. And specific energy consumption also reduced remarkably. Our study has shown that the fabricated Ti/Cu-NRs/SnO2-Sb electrodes are very promising for the electrochemical treatment of wastewater. © 2015 Published by Elsevier Ltd.


Xu L.,Tianjin University | Yu Y.,Tianjin University | Li W.,Tianjin University | You Y.,Tianjin University | And 2 more authors.
Frontiers of Chemical Science and Engineering | Year: 2014

The composite separator comprising of polysulfone and zirconia was prepared by phase inversion precipitation technique. The influence of manufacturing parameters on its properties was investigated, and the results show that the manufacturing parameters affect the ionic resistance and maximum pore size significantly. A modified composite separator with a support layer was prepared to enhance the tensile strength of separator. By adding support layer, the tensile strength of the separator increases from 1.85MPa to 13.66 MPa. In order to evaluate the practical applicability of the composite separator, a small-scale industrial electrolytic experiment was conducted to investigate the changes of cell voltage, gas purity and separator stability. The results show that the modified composite separator has a smaller cell voltage and a higher H2 purity than the asbestos separator, and are promising material for industrial hydrogen production. © 2014, Higher Education Press and Springer-Verlag Berlin Heidelberg.


Xu L.,Tianjin University | Xu L.,Tianjin Key Laboratory of Membrane Science and Desalination Technology | Du L.-S.,Tianjin University | Du L.-S.,Tianjin Key Laboratory of Membrane Science and Desalination Technology | And 2 more authors.
Journal of Membrane Science | Year: 2012

To investigate the effects of electrolytic oxidation on nanofiltration in treating dye waste water, we put a mesh catalytic electrode on the intercept side of the membrane and apply a voltage to realize the coupling of electrolytic oxidation and nanofiltration. The effects of the electroosmosis, electrophoresis and electrochemical oxidation on the flux were investigated. Experiments show that electroosmosis makes the flux increase linearly with the electric intensity. When there is only an electric filed in the coupling experiments, we get that, with the increase of the electric intensity the flux is accelerating until the electric intensity reach the critical value, after that the flux increase linearly with the electric intensity. With the current density increasing, the degraded organics and the bubbles generated increase, and so the thickness of the concentration polarization and gel layer is reduced in a certain degree. The flux increases with the decrease of the feed concentration in the coupling experiments. The trend that the flux increases with the pressure slows down. The flux increases to a certain value and then keeps constant with the increase of the cross flow velocity. The trend that the flux decreases with time slows down with the increase of the voltage, because of the electroosmosis, electrophoresis and electrochemical oxidation. And when the voltage increases to a certain degree, the flux keeps at a high level and changes less with time because the thickness of concentration polarization and gel layer is reduced to the minimum. © 2012 Elsevier B.V.

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