Tertiary amine block copolymer containing ultrafiltration membrane with pH-dependent macromolecule sieving and Cr(VI) removal properties

Yao, Zhikan; Li, Ying; Cui, Yue; Zheng, Ke; Zhu, Bao-Ku; Xu, Hong; Zhu, Liping

doi:10.1016/j.desal.2014.10.030

Cited by 44 publications

(22 citation statements)

References 42 publications

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“…Ultrafiltration (UF) membranes are widely used in water treatment processes due to their low pressure demands and wide range of chemical stability [31]. Several studies have demonstrated the use of UF membrane for Cr(VI) removal, however, Cr(VI) removal for typical polysulfone (10 K Da) UF membranes is very limited, with the maximum rejection of 20% [32][33][34]. Typical approaches attempted to increase Cr(VI) rejection by UF membranes include reducing the UF membrane"s pore size [32] and increasing the membrane surface charge [33,34].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical removal of hexavalent chromium using electrically conducting carbon nanotube/polymer composite ultrafiltration membranes

Duan

Chen

et al. 2017

Journal of Membrane Science

156

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Hexavalent chromium (Cr(VI)) contamination in drinking water resources remains a challenge in many parts of the United States, as well as in regions affected by industrial pollution. In this study, we demonstrated how electrically conducting carbon nanotube (CNT)polyvinyl alcohol (PVA) composite ultrafiltration (UF) membranes can be used to remove Cr(VI) from water through a combined process of electrostatic repulsion, electrochemical reduction, and precipitation. The impact of different operational (flux, contact time, applied electrical potential) and environmental (pH and salinity) conditions on Cr(VI) removal were evaluated. Due to the native electrical potential of the CNT/PVA UF membrane material, approximately 45% removal of 1 ppm Cr(VI) solution was detected under neutral pH conditions in deionized water. Increased Cr(VI) removal was observed with increasing membrane surface charge density, which was accomplished through the application of an external potential (3V, 5V and 7V, membrane as cathode) to the electrically conductive membrane surface. The solution ionic strength showed a significant impact on Cr(VI) removal. By increasing the ionic strength without applying external potential on the membrane, the electrostatic repulsive force between the charged membrane surface and the CrO 4 2ion was eliminated, and Cr(VI) removal dropped to zero. The highest removal (95%) was achieved when 7V was applied to the membrane/counter electrode with a 6 µm-thick membrane. Here, Cr(VI) was electrochemically reduced to Cr(III) on the membrane surface, followed by Cr(III) precipitation as chromium hydroxide Cr(OH) 3(s) , which occurred by Cr(III) reacting with hydroxide ions generated via water splitting on the CNT network. Precipitated Cr(OH) 3 was then removed by the UF membrane. In addition, CNT-PVA UF membranes were used to treat tap water spiked with Cr(VI); under these conditions, 99% Cr(VI) removal was observed when 7V were applied to the membrane/counter electrode. Furthermore, we demonstrate that other trace inorganic contaminants, such as uranium, were effectively removed as well.

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Section: Introductionmentioning

confidence: 99%

Electrochemical removal of hexavalent chromium using electrically conducting carbon nanotube/polymer composite ultrafiltration membranes

Duan

Chen

et al. 2017

Journal of Membrane Science

156

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“…Over the last few decades, artificial membranes have been widely used in the fields of hemodialysis, water treatment, tissue engineering and regenerative medicine [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

A facile approach toward multifunctional polyethersulfone membranes viain situcross-linked copolymerization

Sun

Qin

et al. 2015

Journal of Biomaterials Science, Polymer Edition

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In this study, multifunctional polyethersulfone (PES) membranes are prepared via in situ cross-linked copolymerization coupled with a liquid-liquid phase separation technique. Acrylic acid (AA) and N-vinylpyrrolidone (VP) are copolymerized in PES solution, and the solution is then directly used to prepare PES membranes. The infrared and X-ray photoelectron spectroscopy testing, scanning electron microscopy, and water contact angle measurements confirm the successful modification of pristine PES membrane. Protein adsorption, platelet adhesion, plasma recalcification time, and activated partial thromboplastin time assays convince that the modified PES membranes have a better biocompatibility than pristine PES membrane. In addition, the modified membranes showed good protein antifouling property and significant adsorption property of cationic dye. The loading of Ag nanoparticles into the modified membranes endows the composite membranes with antibacterial activity.

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“…Researchers have begun to study the effects and feasibility of using adsorptive UF membranes to remove harmful ions in aqueous solutions, and adsorptive UF membranes are a promising technology worldwide for the production of potable water. Yao et al . investigated adsorptive UF membranes containing tertiary amine copolymers and their Cr(VI)‐removal properties.…”

Section: Introductionmentioning

confidence: 99%

“…investigated adsorptive UF membranes containing tertiary amine copolymers and their Cr(VI)‐removal properties. PVDF (polyvinylidene fluoride) membranes containing tertiary amine copolymers had a higher removal rate for Cr(VI) (≤99%) at pH 3.5 than polyelectrolyte‐enhanced UF membranes and had only a less than 5% removal rate for Cr(VI) at pH 9.7 . The adsorption capabilities for Cr(VI) and the water fluxes of PVDF membranes containing tertiary amine copolymers depended on the pH value and ionic strength .…”

Section: Introductionmentioning

confidence: 99%

Preparation of a novel poly(ether sulfone) adsorptive ultrafiltration membrane containing a crosslinked quaternary chitosan salt and chromate removal

Huang

Yang

Zhou

et al. 2017

J of Applied Polymer Sci

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To improve the removal performance of low-concentration hexavalent chromium [Cr(VI)] in the ultrafiltration (UF) process, adsorptive UF membranes were prepared from suspensions consisting of poly(ether sulfone), N,N-dimethylacetamide, poly(vinyl pyrrolidone), and crosslinked quaternary chitosan salt (CQS). The results show that the contact angle of the membrane increased from 67 to 838 when the content of CQS was changed from 0 to 10 wt %. Meanwhile, the initial rejection of bovine serum albumin decreased from 90 to 61%, and the pure water fluxes of the membranes showed no obvious change. The rejection of Cr(VI) increased from 20% to 87% when the content of CQS was changed from 0 to 10 wt % in the membrane. Adsorptive UF membranes could be generated by a 1 mol/L solution of NaCl. The adsorption data were more applicable for a pseudo-second-order kinetic model and the Langmuir isotherm model.

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Tertiary amine block copolymer containing ultrafiltration membrane with pH-dependent macromolecule sieving and Cr(VI) removal properties

Cited by 44 publications

References 42 publications

Electrochemical removal of hexavalent chromium using electrically conducting carbon nanotube/polymer composite ultrafiltration membranes

Electrochemical removal of hexavalent chromium using electrically conducting carbon nanotube/polymer composite ultrafiltration membranes

A facile approach toward multifunctional polyethersulfone membranes viain situcross-linked copolymerization

Preparation of a novel poly(ether sulfone) adsorptive ultrafiltration membrane containing a crosslinked quaternary chitosan salt and chromate removal

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