scholarly journals Enhanced Performance of PVDF Composite Ultrafiltration Membrane via Degradation of Collagen-Modified Graphene Oxide

2021 ◽  
Vol 11 (23) ◽  
pp. 11513
Author(s):  
Yonggang Hou ◽  
Shenghua Lv ◽  
Haoyan Hu ◽  
Xinming Wu ◽  
Leipeng Liu
Keyword(s):  
Graphene Oxide ◽  
Polyvinylidene Fluoride ◽  
Membrane Surface ◽  
Water Flux ◽  
Ultrafiltration Membrane ◽  
Carboxyl Content ◽  
Modified Graphene Oxide ◽  
Leather Waste ◽  
Improved Performance ◽  
Modified Graphene

The collagen obtained from chrome leather waste can be used to modify graphene oxide (GO) to prepare polyvinylidene fluoride (PVDF) composite ultrafiltration membranes, a process that is conducive to the recovery of leather waste, comprehensive utilization of GO and improved performance of the membrane. In this paper, collagen-modified GO (CGO) was prepared by degradation of collagen from chrome leather waste and used to prepare a PVDF composite ultrafiltration membrane. The results show that the carboxyl content of CGO and dispersion were improved. The water flux and flux recovery rate of the modified ultrafiltration membrane were improved. The bovine serum albumin (BSA) intercepted on the membrane surface was easy to clean and the antifouling performance improved. The performance of the membrane decreased when the GO content exceeded 0.75 wt%, while CGO can reach 1.0 wt% without agglomeration due to its good dispersion.

scholarly journals Preparation and Properties of Polyvinylidene Fluoride Nanocomposited Membranes based on Poly(N-Isopropylacrylamide) Modified Graphene Oxide Nanosheets

Polymers ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 473 ◽  
Author(s):  
Xiangli Meng ◽  
Yuan Ji ◽  
Genhua Yu ◽  
Yujia Zhai
Keyword(s):  
Contact Angle ◽  
Graphene Oxide ◽  
Photoelectron Spectroscopy ◽  
Polyvinylidene Fluoride ◽  
Phase Inversion ◽  
Doping Amount ◽  
Water Contact ◽  
Modified Graphene Oxide ◽  
Modified Graphene ◽  
Scanning Electron

The nanomaterial of graphene oxide grafting poly (N-isopropylacrylamide) (GO-g-PNIPAAm) was synthesized and PVDF/GO-g-PNIPAAm blended membranes were fabricated by wet phase inversion. In this work, a hydrophilic nanomaterial GO-g-PNIPAAm with poly(N-isopropylacrylamide) (PNIPAAm) grafted on GO, was synthesized by the atom transfer radical polymerization (ATRP) method. The resulting nanomaterial was confirmed by scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR), Raman spectrum, and X-ray photoelectron spectroscopy (XPS) analysis. The synthesized GO-g-PNIPAAm was incorporated with polyvinylidene fluoride (PVDF) via phase inversion, and investigated for its temperature sensitivity, porosity, contact angle, scanning electron microscopy, and permeate properties. The water contact angle measurements confirmed that GO-g-PNIPAAm nanomaterial-endowed PVDF membranes with better hydrophilicity and thermo-responsive properties compared with those of the pristine PVDF membranes. Bovine serum albumin (BSA) adsorption experiments suggested that excellent antifouling properties of membranes were acquired after adding GO-g-PNIPAAm. The modified membranes showed good performance when the doping amount of GO-g-PNIPAAm was 0.2 wt %.

scholarly journals Color Removal from Wastewater using a Synthetic High Performance Antifouling GO-CPTMS@Pd-TKHPP/Polyether Sulfone Nanofiltration Membrane

2021 ◽  
Author(s):  
foad gholami ◽  
sirus zinadini ◽  
Soheila Nakhjiri Kamrani ◽  
ali akbar zinatizadeh ◽  
Kiumars Bahrami
Keyword(s):  
Graphene Oxide ◽  
High Performance ◽  
Pure Water ◽  
Water Flux ◽  
Nanofiltration Membrane ◽  
Powdered Milk ◽  
Water Contact ◽  
Polyether Sulfone ◽  
Modified Graphene Oxide ◽  
Modified Graphene

Abstract Modified graphene oxide with 5,10,15,20-tetrakis‐(4‐hexyloxyphenyl) ‐porphyrin and palladium (II) (signified by GO-CPTMS@Pd-TKHPP) prepared as a novel antifouling polyether sulfone (PES) blended nanofiller membrane. The membrane efficiency has been analyzed such as pure water flux (PWF), hydrophilicity and antifouling features. By increasing of modified graphene oxide percentage from 0 to 0.1 wt.% in polymer matrix the PWF was incremented from 14.35 to 37.33 kg/m2.h at 4bar. The membrane flux recovery ratio (FRR) has been investigated by applying powdered milk solution, the FRR results indicated that the 0.1 wt.% modified graphene oxide membrane showed the positive effect on fouling behavior with Rir and FRR value 8.24 and 91.73% respectively. The nanofiltration membrane performance was assessed applying the Direct Red 16 dye rejection. It was demonstrated that the optimal membranes (0.1 wt.% modified graphene oxide) had notable dye removal (99.58 % rejection). The results are also verified by measuring the scanning electron microscopy (SEM), water contact angle (WCA) and atomic microscopy analysis (AFM).

scholarly journals Design, synthesis, and catalytic performance of modified graphene oxide based on a cobalt complex as a heterogenous catalyst for the preparation of aminonaphthoquinone derivatives

RSC Advances ◽  
2021 ◽  
Vol 11 (28) ◽  
pp. 17108-17115
Author(s):  
Mahnaz Mirheidari ◽  
Javad Safaei-Ghomi
Keyword(s):  
Graphene Oxide ◽  
Cobalt Complex ◽  
Catalytic Performance ◽  
Silica Particles ◽  
Design Synthesis ◽  
Spherical Silica ◽  
Modified Graphene Oxide ◽  
Spherical Silica Particles ◽  
Heterogenous Catalyst ◽  
Modified Graphene

GO@f-SiO2@Co is a heterogenous catalyst composed of spherical silica particles grafted on the surface of graphene oxide with ethylenediamine ligands and coordination with Co(ii). We assessed the activity of the catalyst for the synthesis of aminonaphthoquinones.

Enhanced flame retardancy of polypropylene by melamine-modified graphene oxide

2015 ◽  
Vol 50 (16) ◽  
pp. 5389-5401 ◽  
Author(s):  
Bihe Yuan ◽  
Haibo Sheng ◽  
Xiaowei Mu ◽  
Lei Song ◽  
Qilong Tai ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Flame Retardancy ◽  
Modified Graphene Oxide ◽  
Modified Graphene
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