Construction and performance of composite nanoporous PVDF membrane loaded with TiO2-based catalysts for organic pollutants’ removal

Scale-Up Fabrication of Fiber Membrane Based on Nanoporous Polyurea Colloids for Organic Solvents/Water Separation

“…The chemical characteristics of the membrane surfaces were visualized with the FT-IR spectra. The characteristic peaks including hydroxyl (3292 cm –1 ) and −C–O (1086 cm –1 ) groups appeared in the spectrum of the PVA substrate . In contrast to the PVA membrane, an absorption peak at 2270 cm –1 was observed in the spectra of the CPVA and CPVANP membranes (Figure a), which corresponds to the stretching vibration of the –NCO bond in the PDI, respectively.…”

“…The characteristic peaks including hydroxyl (3292 cm −1 ) and −C−O (1086 cm −1 ) groups appeared in the spectrum of the PVA substrate. 40 In contrast to the PVA membrane, an absorption peak at 2270 cm −1 was observed in the spectra of the CPVA and CPVANP membranes (Figure 4a), which corresponds to the stretching vibration of the −N�C�O bond in the PDI, respectively. This observation confirmed the secondary cross-linking reaction in the cross-linked membranes.…”

“…31,36 By integrating porogen or fillers with membrane matrix, it can easily gain hierarchical porous membranes with desirable properties. 37,38 In our previous work, functional fibrous membranes were prepared by combining electrospinning with functional colloids, 39,40 in which heterogeneous blending and direct introduction of porogen or fillers would ultimately affect the rejection performance and mechanical properties of the membrane. Therefore, homogeneous blending that can maintain the original structure and mechanical properties of the membrane and provide excellent pore properties is a more beneficial solution.…”

“…Among these membrane-made approaches, the electrospinning technique demonstrates a remarkable technique to prepare large-size and scale-up membranes for distillation and nanofiltration . Electrospun membranes possess distinctive advantages, including high porosity, easy adjustment of pore structure, and the ability to adjust the separation efficiency and flux of membrane materials by changing the type of substrate or surface modification. , By integrating porogen or fillers with membrane matrix, it can easily gain hierarchical porous membranes with desirable properties. , In our previous work, functional fibrous membranes were prepared by combining electrospinning with functional colloids, , in which heterogeneous blending and direct introduction of porogen or fillers would ultimately affect the rejection performance and mechanical properties of the membrane. Therefore, homogeneous blending that can maintain the original structure and mechanical properties of the membrane and provide excellent pore properties is a more beneficial solution .…”