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Pan T.,Donghua University | Li F.,Donghua University | Li F.,State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry | Du C.,Zhejiang GongShang University | And 5 more authors.
Huanjing Kexue Xuebao/Acta Scientiae Circumstantiae | Year: 2015

In this paper, the hydrophobic PVDF membranes were modified via UV-irradiation to graft the hydrophilic monomer poly(ethylene glycol) methacrylate (PEGMA) on the membrane surface, which can improve the hydrophilicity of the PVDF membrane. The addition of the N, N-methylene bisacrylamide (MBAA) as cross-linking agent was found to reduce the swelling of the PEG grafed-layer. The influence of the modification condition on membrane performance was investigated. The modified membranes were characterized with surface contact angle (CA), infrared spectroscopy (ATR-IR), scanning electron microscopy (SEM), and the filtration tests of emulsion. BSA solution were conducted to investigate the separation efficiency and anti-fouling ability of the modified membrane. The experimental results showed that the hydrophilicity and anti-fouling ability of the modified membranes were improved obviously. ©, 2015, Science Press. All right reserved. Source


Chen X.,Donghua University | Chen X.,State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry | Dai R.,Donghua University | Xiang X.,Donghua University | And 4 more authors.
Water Science and Technology | Year: 2016

The shock resistance characteristic (SRC) of an anaerobic bioreactor characterizes the ability of the anaerobic community in the reactor to withstand violent change in the living environment. In comparison with an upflow anaerobic sludge blanket reactor (UASBR), the SRC of a spiral symmetry stream anaerobic bio-reactor (SSSAB) was systematically investigated in terms of removal efficiency, adsorption property, settling ability, flocculability and fluctuations in these parameters. A quantitative assessment method for SRC was also developed. The results indicated that the SSSAB showed better SRC than the UASBR. The average value (m value) of chemical oxygen demand removal rates of the SSSAB was 86.0%. The contact angle of granules in the SSSAB present gradient distribution, that is the m value of contact angle increasing from bottom (84.5W) to top (93.9W). The m value of the density at the upper and lower sections of the SSSAB were 1.0611 g•cm-3 and 1.0423 g•cm-3, respectively. The surface mean diameter of granules in the SSSAB increased from 1.164 to 1.292 mm during operation. The absolute m value of zeta potential of granular sludge at the upper and lower sections of the SSSAB were 40.4 mV and 44.9 mV, respectively. The weighted mean coefficient variance (CV) value indicated SSSAB was more stable than the UASBR. © 2016 IWA Publishing. Source


Wu L.-X.,Donghua University | Wu L.-X.,State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry | Yang J.,Donghua University | Yang J.,State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry | And 4 more authors.
Zhongguo Huanjing Kexue/China Environmental Science | Year: 2015

Cobalt tetrasulfophthalocyanine was successfully immobilized on polystyrene resin, protecting them from the self-oxidation under oxidation conditions. The results showed that the removal efficiency of dye C. I. Acid Blue 25 achieved to 99% in the presence of polystyrene resin D201 supported cobalt tetrasulfophthalocyanine and hydrogen peroxide. Besides, the regeneration studies demonstrated that the polystyrene resin immobilized catalyst could be reused effectively. The main mechanism was that cobalt tetrasulfophthalocyanine was firmly anchored through the electronic interactions between the π electrons of the benzene rings of the polystyrene polymers in resin and macrocycle of phthalocyanines. Then its drawback of self-oxidation was improved and the catalytic activity was enhanced. ©, 2015, Zhongguo Huanjing Kexue/China Environmental Science. All right reserved. Source


Rashid S.,Donghua University | Rashid S.,State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry | Shen C.,Donghua University | Shen C.,State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry | And 9 more authors.
RSC Advances | Year: 2015

In this study, despite the high adsorption ability, efficient catalytic activity of a chitosan-metal complex has been developed through the chelation of chitosan polymer with bimetals Cu(ii) and Fe(iii). The removal of C. I. Reactive Black 5 (RB 5) by the chitosan-Cu-Fe complex/H2O2 system was studied in the pH range from 4 to 12. The maximal dye removal rate was achieved at an optimal concentration of Cu and Fe in the chitosan-Cu-Fe matrix, demonstrating the combination of sorptive enrichment and catalytic degradation. The results indicated that TOC removal and discoloration of the dye achieved 89.9% and 96.5% in a short reaction time. The pH sensitivity of the chitosan complex, the effect of the coexisting ions and the adsorption of other anionic dyes were also studied. X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX) were analyzed to study the structure of the chitosan bi-metal complex and a possible mechanism was proposed. © The Royal Society of Chemistry 2015. Source


Li F.,Donghua University | Li F.,State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry | Deng C.,Donghua University | Deng C.,Baylor University | And 5 more authors.
Water SA | Year: 2015

Membrane surface modification via grafting poly(ethylene glycol) (PEG) onto the coated polydopamine (PD) layer is an attractive strategy because it can improve the hydrophilicity of the membrane surface. Sodium alginate (SA), bovine serum albumin (BSA), and humic acid (HA) were used as model foulants to investigate the fouling mechanism and cleanability of modified membranes. The modification narrowed or blocked the membrane pores, which led to a reduction in the permeability of ultrafiltration membranes. A Hermia model was used to explore the fouling mechanism of the modified membranes. PD-g-PEG modified membranes exhibit a lower adsorption for the model foulants and a better cleanability than the unmodified membranes. © 2015, South African Water Research Commission. All Rights Reserved. Source

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