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13 results on '"Hai, Yuyan"'

6. Fabrication of a hybrid ultrafiltration membrane based on MoS2 modified with dopamine and polyethyleneimine

Author

Xue Yang, Ma Rui, Hui Wei, Yunlong Qi, Xin Wen, Sun Jianyu, Xiaofan Liu, Jingyun Chen, Can He, and Hai Yuyan

Subjects
chemistry.chemical_classification, biology, General Chemical Engineering, education, Membrane fouling, technology, industry, and agriculture, Ultrafiltration, Nanoparticle, macromolecular substances, 02 engineering and technology, General Chemistry, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, Biofouling, Membrane, chemistry, Chemical engineering, Permeability (electromagnetism), biology.protein, Humic acid, Bovine serum albumin, 0210 nano-technology
Abstract

The hydrophobicity of ultrafiltration membranes is the main cause of membrane fouling and reduced permeability, so it is necessary to improve the hydrophilicity and anti-fouling performance of ultrafiltration membrane materials. MoS2 nanoparticles that were modified with polydopamine (PDA) and polyethyleneimine (PEI), named MoS2-PDA-PEI, were added to fabricate a polyethersulfone ultrafiltration membrane (PES/MoS2-PDA-PEI) for the first time. The effects of modified MoS2 nanoparticles on membrane performance were clarified. The results indicated that the permeability, rejection, and anti-fouling capability of the hybrid PES/MoS2-PDA-PEI membrane have been improved compared with the pristine PES membrane. When the content of MoS2-PDA-PEI nanoparticles in the membrane is 0.5%, the pure water flux of the hybrid membrane reaches 364.03 L m−2 h−1, and the rejection rate of bovine serum albumin (BSA) and humic acid (HA) is 96.5% and 93.2% respectively. The flux recovery rate of HA reached 97.06%. As expected, the addition of MoS2-PDA-PEI nanoparticles promotes the formation of the porous structure and improves the hydrophilicity of the membrane, thereby improving its antifouling performance.

Published
2021

12. Activated g-C3N4 Photocatalyst with Defect Engineering for Efficient Reduction of CO2in Water

Author

Tong, Zhenwei, Hai, Yuyan, Wang, Baodeng, Lv, Fei, Zhong, Zhencheng, and Xiong, Rihua

Abstract

The conversion and utilization of CO2into hydrocarbon fuel using solar energy is an attractive way to reduce CO2emissions. In the photocatalytic CO2conversion process, a synergistic enhancement of both photoreaction and chemical reaction is quite important for promoting the conversion. Here, we present a facile method for preparing a defective and activated graphitic carbon nitride (g-C3N4) photocatalyst, which exhibits a superior CO2-to-CO production of 32.06 μmol g–1without sacrificial agent or noble metal. This is about 9.1 times higher than that of the defect containing g-C3N4(3.51 μmol g–1). The activated g-C3N4, in which the TiO2species coexist, not only improved the CO production to 54.03 umol g–1but also reduced CO2into CH4with 2.50 umol g–1in 5 h. This is because the coexistence of TiO2species in activated g-C3N4promotes molecule and electron transfer, as observed through experimental characterization techniques. Therefore, this work provides a novel insight into the synthesis of multifunctional g-C3N4for efficient photocatalytic CO2reduction with H2O.

Published
2023
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13. Fabrication of a hybrid ultrafiltration membrane based on MoS 2 modified with dopamine and polyethyleneimine.

Author

Wen X, He C, Hai Y, Liu X, Ma R, Sun J, Yang X, Qi Y, Chen J, and Wei H

Abstract

The hydrophobicity of ultrafiltration membranes is the main cause of membrane fouling and reduced permeability, so it is necessary to improve the hydrophilicity and anti-fouling performance of ultrafiltration membrane materials. MoS 2 nanoparticles that were modified with polydopamine (PDA) and polyethyleneimine (PEI), named MoS 2 -PDA-PEI, were added to fabricate a polyethersulfone ultrafiltration membrane (PES/MoS 2 -PDA-PEI) for the first time. The effects of modified MoS 2 nanoparticles on membrane performance were clarified. The results indicated that the permeability, rejection, and anti-fouling capability of the hybrid PES/MoS 2 -PDA-PEI membrane have been improved compared with the pristine PES membrane. When the content of MoS 2 -PDA-PEI nanoparticles in the membrane is 0.5%, the pure water flux of the hybrid membrane reaches 364.03 L m -2 h -1 , and the rejection rate of bovine serum albumin (BSA) and humic acid (HA) is 96.5% and 93.2% respectively. The flux recovery rate of HA reached 97.06%. As expected, the addition of MoS 2 -PDA-PEI nanoparticles promotes the formation of the porous structure and improves the hydrophilicity of the membrane, thereby improving its antifouling performance., Competing Interests: There are no conflicts to declare., (This journal is © The Royal Society of Chemistry.)

Published
2021
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