scholarly journals Polyacrylonitrile Nanofiber Membrane Modified with Ag/GO Composite for Water Purification System

Polymers ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2441
Author(s):  
Wongi Jang ◽  
Jaehan Yun ◽  
Yejun Park ◽  
In Kee Park ◽  
Hongsik Byun ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Water Flux ◽  
Precursor Solution ◽  
Nanofiber Membrane ◽  
Simple Modification ◽  
Pore Property ◽  
Polymer Nanofiber ◽  
Modified Graphene Oxide ◽  
Modified Graphene ◽  
Pan Nanofiber

Silver nanoparticle-modified graphene oxide (Ag/GO) was reliably prepared by using sodium borohydride (NaBH4) in the presence of citric acid capping agent via a simple wet chemistry method. This rapidly formed Ag/GO composite exhibited good dispersity in a solution containing hydrophilic polyacrylonitrile (PAN). Subsequent electrospinning of this precursor solution resulted in the successful formation of nanofibers without any notable defects. The Ag/GO-incorporated PAN nanofibers showed thinner fiber strands (544 ± 82 nm) compared to those of GO-PAN (688 ± 177 nm) and bare-PAN (656 ± 59 nm). Subsequent thermal treatment of nanofibers resulted in the preparation of thin membranes to possess the desired pore property and outstanding wettability. The Ag/GO-PAN nanofiber membrane also showed 30% higher water flux value (390 LMH) than that of bare-PAN (300 LMH) for possible microfiltration (MF) application. In addition, the resulting Ag/GO-PAN nanofiber membrane exhibited antibacterial activity against Escherichia coli (Gram-negative) and Staphylococcus aureus (Gram-positive). Furthermore, this composite membrane exhibited outstanding anti-fouling property compared to the GO-PAN nanofiber membrane in the wastewater treatment. Therefore, the simple modification strategy allows for the effective formation of Ag/GO composite as a filler that can be reliably incorporated into polymer nanofiber membranes to possess improved overall properties for wastewater treatment applications.

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 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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