Tianjin Motimo Membrane Technology Co.

Tianjin, China

Tianjin Motimo Membrane Technology Co.

Tianjin, China
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Wang X.,Tianjin Polytechnic University | Xiao C.,Tianjin Polytechnic University | Pan J.,Tianjin Polytechnic University | Hu X.,Tianjin MOTIMO Membrane Technology Co. | Huan G.,Tianjin MOTIMO Membrane Technology Co.
Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering | Year: 2017

The recycled performance of waste polyvinylidene fluoride (PVDF) hollow fiber membrane was studied which has run in the membrane bioreactor (MBR) system for 6 years. The effect of membrane fouling on properties of PVDF hollow fiber membranes was discussed during running time. Recycled PVDF flat membranes were fabricated via wet phase-inversion method. Results show that after being used for 6 years, the pore-creating agents content in PVDF hollow fiber membranes (such as PEG or PVP) reduces to zero. The tensile strength and elongation at break of PVDF hollow fiber membranes decrease. The crystallinity increases and membrane pores are clogged by impurities. Compared with conventional PVDF membranes, recycled PVDF membranes have lower breaking strength, smaller elongation at break, reduction of molecular weight and difficulty in creating pore (lower porosity) during preparing membrane process increase, but wettability, permeability and rejection rate of recycled PVDF membranes are similar to conventional PVDF membranes. © 2017, Editorial Board of Polymer Materials Science & Engineering. All right reserved.


Ma N.,Tianjin Polytechnic University | Zhao L.,Tianjin Polytechnic University | Hu X.,Tianjin Motimo Membrane Technology Co. | Yin Z.,Tianjin Polytechnic University | And 2 more authors.
Industrial and Engineering Chemistry Research | Year: 2017

A series of charge-modified polyacrylonitrile (PAN) membranes with different surface charge properties and densities have been obtained via first grafting with hyperbranched polyethylenimine (PEI) and then ring-opening with 1,4-butane sultone. The obtained PAN-gr-PEI membranes and PAN-gr-PEIS membranes have hyperbranched polycation and hyperbranched zwitterions tethered on the surface, respectively. They were characterized in detail by FT-IR, AFM, XPS, SEM, WCA, and zeta-potential measurements. Bovine serum albumin (BSA) and lysozyme (Lys) were chosen as model proteins in order to evaluate the separation performance of the modified membranes via dead-end ultrafiltration. The membranes grafted with PEI of different densities have different surface chemical compositions but very similar surface charge properties. PAN and PAN-gr-PEI membranes are highly negatively charged and moderately positively charged. PAN-gr-PEIS membranes show typical amphoteric characteristics. The UF performance is highly dependent on charge properties. The membrane shows high flux and low transmission when membrane and protein have the same charge. At pH of 7 and 10, BSA and Lys are oppositely charged so that PAN-gr-PEIS and PAN membranes show good selectivity. When membrane and protein are oppositely charged, the membrane was fouled severely, including zwitterionic PAN-gr-PEIS membranes, which should be due to the stiffness of the hyperbranched zwitterions. © 2017 American Chemical Society.


Wen P.,Tianjin Polytechnic University | Chen Y.,Tianjin Polytechnic University | Hu X.,Tianjin Motimo Membrane Technology Co. | Cheng B.,Tianjin Polytechnic University | And 4 more authors.
Journal of Membrane Science | Year: 2017

In order to reach both high water permeability and high ion rejection, a thin-film composite nanofiltration membrane (PA/GO-COCl) with acyl chlorided graphene oxide (GO-COCl) embedded in polyamide (PA) layer was fabricated by interfacial polymerization of piperazine and trimesoyl chloride. GO-COCl was synthesized by acyl chloride reaction with graphene oxide and then added into a nonpolar organic (hexane) phase using 2% ethanol as dispersant. The surface morphologies and chemical structures of the modified membranes were observed by scanning electronic microscopy, atomic force microscopy, X-ray photoelectron spectroscopy and FTIR spectroscopy. Water flux of the PA/GO-COCl membrane increased from 11.6 to 22.6 L m−2 h−1, and salt rejection of Na2SO4 increased from 95.0% to 97.1%, compared with those of the pristine PA membrane. Enhanced performances of the PA/GO-COCl membrane were attributed to the incorporation of laminated graphene oxide sheets, which decrease effective thickness of the active layer and keep the layer intact for high rejection rate. This graphene oxide embedded membrane overcomes the trade-off effect of conventional thin film composite nanofiltration membranes, suggesting a novel method for fabricating 2D laminar materials embedded thin film composite membranes for nanofiltration or reverse osmosis. © 2017 Elsevier B.V.


Hao Y.,Hebei University of Science and Technology | Cao Y.,Hebei University of Science and Technology | Sun B.,Hebei University of Science and Technology | Zhang Y.,Hebei University of Science and Technology | And 3 more authors.
Acta Chimica Sinica | Year: 2012

In this paper, ordered one-dimensional poly (3-hexylthiophene) (P3HT) /CdS/TiO2/ZnO core-shell nanorod arrays were fabricated. Highly ordered and vertically oriented one-dimensional ZnO nanorod arrays were electrodeposited on the indium-tin oxide (ITO) glass substrates. TiO2 sol was deposited on ZnO nanorod array by dip-coating to obtain TiO2/ZnO core-shell nanorod array. CdS nanocrystals were electrodeposited on the TiO2/ZnO core-shell nanorods to fabricate CdS/TiO2/ZnO core-shell nanorod arrays. Then a thin P3HT layer was electrodeposited on the CdS/TiO2/ZnO core-shell nanorod arrays to prepare the photoanode of the nanostructured hybrid solar cell. The photovoltaic performance of the hybrid solar cell was tested, and the mechanism of the solar cell was investigated.


Li X.,Tianjin Polytechnic University | Chen Y.,Tianjin Polytechnic University | Hu X.,Tianjin Motimo Membrane Technology Co. | Zhang Y.,Tianjin Polytechnic University | Hu L.,Tianjin Polytechnic University
Journal of Membrane Science | Year: 2014

Novel poly(vinyl alcohol) (PVA)/poly(vinylidene fluoride) (PVDF) hollow fiber composite membranes modified with nano-TiO2 were prepared by a dip-coating method and they are suitable to be utilized in dye desalination and wastewater treatment. Glutaraldehyde (GA) was used as a cross-linker for the composite polymer membrane in order to enhance the chemical, thermal as well as mechanical stabilities. The surface morphologies and chemical structures of modified membranes were observed by scanning electronic microscopy (SEM), energy dispersive spectroscopy (EDS) and FTIR spectroscopy. Zeta potential of the membrane surface was used to analyze the membrane separation performance. Separation efficiency of dye and salts through novel PVA/PVDF composite membrane was dramatically influenced by dye concentration, salts concentration, pH and temperature of feed solution. Fouling and thermal stability of the membrane were also evaluated with CR, NaCl, and Na2SO4 as model compounds. The separation datas showed that the 1g/L nano-TiO2 modified membrane presented highest performance in terms of the rejections to CR, MO, and MB being 94±2.57%, 52.1±2.45%, and 92±2.20%, respectively. And all the PVA composite membranes had no rejection to salts (NaCl, Na2SO4). Compared with PVA composite membrane, the PVA composite membrane modified with nano-TiO2 has higher separation efficiency, antifouling and thermal stability. © 2014 Elsevier B.V.


Quan Q.,Tianjin Polytechnic University | Xiao C.F.,Tianjin Polytechnic University | Liu H.L.,Tianjin Polytechnic University | Zhao W.,Tianjin Polytechnic University | And 2 more authors.
Advanced Materials Research | Year: 2014

The two-dimensional braid heterogeneous-reinforced (BHR) polyvinylidene fluoride (PVDF) hollow fiber membranes which include PVDF polymer solutions (coating layer) and the two-dimensional braid as a reinforcement were prepared through the dry-wet spinning process. The influence of PVDF concentration in polymer solutions on performance of BHR hollow fiber membranes were investigated by terms of pure water flux, protein rejection, a mechanical strength test, and morphology observations by a scanning electron microscope (SEM). The results of this study indicated that the tensile strength of the BHR PVDF hollow fiber membranes was nearly 75 MPa and the hollow fiber membranes were endowed with better flexibility performance. The BHR PVDF hollow fiber membranes had a favorable interfacial bonding between the coating layer and the two-dimensional braid. The pure water flux decreased, while the rejection ratio increased with the increase of polymer concentration. © (2014) Trans Tech Publications, Switzerland.


Zhang H.,Tianjin Polytechnic University | Li X.-L.,Tianjin Motimo Membrane Technology Co. | Hu X.-Y.,Tianjin Polytechnic University | Chen Y.-B.,Tianjin Polytechnic University | Xiao C.-F.,Tianjin Polytechnic University
Gongneng Cailiao/Journal of Functional Materials | Year: 2012

The mechanochemical treatment of PVC was studied by ball mill and the structure changes of PVC was analyzed. Based on the research, the flat membranes were prepared using the PVC before and after mechanochemical treatment, respectively by thermally induced phase separation (TIPS) method. The structure and properties of membranes were studied by FT-IR, DSC and SEM. Results showed that the mechanochemical treatment eliminated the PVC pomegranate appearance structure which made PVC difficult to be processed, and the perfection of initial micro-crystal of PVC was also reduced. The water flux of the flat membrane built of PVC after mechanochemical treatment by TIPS method reached 693.6 L/(m2·h) which was much higher than that built of PVC before mechanochemical treatment with the value of only 7.1 L/(m2·h), and the fracture strength of the flat membrane was also increased.


Sun C.,Chemical Engineering Research Center | Xie L.,Chemical Engineering Research Center | Li X.,Chemical Engineering Research Center | Sun L.,Tianjin MOTIMO Membrane Technology Co. | Dai H.,Tianjin MOTIMO Membrane Technology Co.
Desalination | Year: 2015

Performance of different pretreatment systems with ultrafiltration (UF) prior to reverse osmosis (RO) for desalting seawater was assessed in this paper. The pilot trial was operated on seawater from Bohai Bay in Tianjin using polyvinylidene fluoride (PVDF) hollow fiber UF membrane. During these experiments, membrane specific flux (SF) was calculated to evaluate the performance of UF. Results of the research showed that in a chemical enhanced backwash (CEB) period, the combination of UF with FeCl3 flocculation pretreatment was helpful in controlling the decrease of SF during the operation. Besides, the result also showed that FeCl3 flocculation/dual-stage sand filtration/UF performed effectively in terms of the stable of SF in a CEB period than FeCl3 flocculation/UF alone. In addition, water analysis was regularly performed to quantify pollutants in the effluents of different hybrid processes. According to the experiment, UF can provide product water with consistently low turbidity (0.07-0.12NTU) and low silt density index (SDI15 less than 2) levels regardless of seawater quality. Sand filtration showed good performance for turbidity removal (less than 0.5NTU in effluent), but limited effect on SDI removal (not below 4). Total organic carbon (TOC) removal up to 28% was obtained in FeCl3 flocculation/dual-stage sand filtration/UF hybrid system. © 2015 Elsevier B.V.


Patent
Tianjin Motimo Membrane Technology Co. | Date: 2012-07-02

A method for making a liquid separation membrane, including: (1) providing a polyvinylidene fluoride liquid separation membrane or polypropylene liquid separation membrane prepared by a thermally induced phase separation method as a substrate membrane, soaking the substrate membrane with water or a weak polar organic liquid to make membrane pores of the substrate membrane filled with the liquid, the soaking time being between 0.5 s and 1 min, and the weak polar organic liquid being indissolvable and compatible with the polyvinylidene fluoride liquid separation membrane or polypropylene liquid separation membrane; (2) coating a casting solution of polyvinylidene fluoride on the surface of the soaked substrate membrane obtained in step (1), and quickly soaking the substrate membrane in a coagulating bath heated to a temperature of 60-100 C. for curing to yield the liquid separation membrane.


Disclosed is a method for preparing a liquid separation membrane complexed and reinforced with polyvinylidene fluoride, comprising the following steps: subjecting a polyvinylidene fluoride liquid separation membrane or a polypropylene liquid separation membrane prepared by thermally induced phase separation, as a base membrane, to infiltration with any one of water and weakly polar organic liquids such that the pores of the base film are filled with the liquid; coating the surface of the infiltrated base membrane with a polyvinylidene fluoride casting solution and then quickly immersing the membrane into a curing bath for curing such that a liquid separation membrane complexed and reinforced with polyvinylidene fluoride is obtained. The liquid separation membrane obtained by the method both has a good mechanical property and a high retention rate, and the skin layer is not liable to peel off during use.

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