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Chao Wang,Zhenhuan Li,Lei Cao,Bo-wen Cheng 한국고분자학회 2018 Macromolecular Research Vol.26 No.9
Polyphenylene sulfide (PPS) membranes were modified by chloromethylation and quaternary amination reaction to prepare a hydrophilic PPS microporous membrane. The structures of the modified PPS membranes were characterized by the use of Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and scanning electron microscopy. The results showed that the modified membranes maintain the same microporous structures as the PPS membrane. The hydrophilicity of the modified membranes was significantly improved compared to that of the PPS membranes, and the water flux of N-methylimidazole modified membranes, triethylamine modified membranes, and both mixture modified membranes achieved 110.475, 168.94, 150.59 L·m-2·h-1, respectively. The quaternary amination of the PPS membranes made much less bovine serum albumin (BSA) pollution accumulation on the top surface of the modified membranes, and there was a significant improvement, to 94%, in the BSA rejection rate. Most importantly, the antibacterial activity of the modified membranes was effectively improved, and the bactericidal rate was elevated to above 80% in comparison with pure PPS membranes, which was attributed to the introduction of quaternary ammonium salts and imidazolium salts in out-surface of the membranes.
Numerical prediction analysis of propeller bearing force for full-scale hullepropellererudder system
Chao Wang,Shuai Sun,Liang Li,Liyu Ye 대한조선학회 2016 International Journal of Naval Architecture and Oc Vol.8 No.6
The hybrid grid was adopted and numerical prediction analysis of propeller unsteady bearing force considering free surface was performed for mode and full-scale KCS hullepropellererudder system by employing RANS method and VOF model. In order to obtain the propeller velocity under self-propulsion point, firstly, the numerical simulation for self-propulsion test of full-scale ship is carried out. The results show that the scale effect of velocity at self-propulsion point and wake fraction is obvious. Then, the transient two-phase flow calculations are performed for model and full-scale KCS hullepropellererudder systems. According to the monitoring data, it is found that the propeller unsteady bearing force is fluctuating periodically over time and full-scale propeller's time-average value is smaller than model-scale's. The frequency spectrum curves are also provided after fast Fourier transform. By analyzing the frequency spectrum data, it is easy to summarize that each component of the propeller bearing force have the same fluctuation frequency and the peak in BFP is maximum. What's more, each component of full-scale bearing force's fluctuation value is bigger than model-scale's except the bending moment coefficient about the Y-axis.
Electrochemical Degradation of Textile Effluent Using PbO<sub>2</sub> Electrode in Tube Electrolyzer
Chao Wang,Yongqiang Li,Junmin Wan,Yi Hu,Yi Huang The Korean Electrochemical Society 2024 Journal of electrochemical science and technology Vol.15 No.1
A commercial PbO<sub>2</sub> mesh cylinder electrode was utilized as the anode for the electrochemical degradation of the textile effluent after the biological treatment with the titanium cylinder as the cathode in a self-made tube electrolyzer. The electrochemical performances of the PbO<sub>2</sub> electrode in tube electrolyzer under different initial pH, electrolyte flow rates, current densities and times of the electrochemical degradation were investigated. The experimental results illustrated that the PbO<sub>2</sub> electrode can reduce the chemical oxygen demand (COD) of the textile effluent from 94.0 mg L<sup>-1</sup> to 65.0 mg L<sup>-1</sup> with the current efficiency of 88.3%, the energy consumption of 27.7 kWh kg<sup>-1</sup> (per kilogram of degraded COD) and the carbon emissions of 18.0 kg CO<sub>2</sub> kg<sup>-1</sup> (per kilogram of degraded COD) under the optimal operating conditions. In addition, the COD of the textile effluent could be reduced from 94.0 mg L<sup>-1</sup> to 22.0 mg L<sup>-1</sup> after the fifth electrochemical degradation. Therefore, PbO<sub>2</sub> mesh cylinder electrode in the tube cylinder was promising for the electrochemical degradation of the textile effluent.