Graphene oxide polypiperazine-amide nanofiltration membrane for improving flux and anti-fouling in water purification

Abstract

In this study, a facile polypiperazine-amide (PPA) composite nanofiltration (NF) membrane with nanomaterial graphene oxide (GO) incorporated into a polyamide (PA) layer for high water flux and anti-fouling was fabricated by interfacial polymerization (IP). The chemical composition, structure and surface properties of the fabricated PPA/GO and PPA composite NF membranes were characterized by FTIR, XPS, FE-SEM, AFM, zeta-potential and contact angle measurements. The separation properties and anti-fouling ability of the PPA/GO NF membrane were investigated and discussed. The experimental results indicated that the water flux of the PPA/GO (300 mgunder the operating pressure of 0.6 MPa, almost 1.4 times that of the PPA (without GO) membrane.However, the high salt rejection was still retained in the order of Na 2 SO 4 (98.2%) > MgSO 4 (96.5%) > NaCl (56.8%) > MgCl 2 (50.5%). An anti-fouling test revealed that the PPA/GO membrane had excellent antifouling properties due to the enhanced hydrophilicity and decreased roughness induced by the GO nanosheets. Thus, the PPA/GO membrane can be efficiently and endurably applied in water purification.

Design of ultrathin hybrid membranes with improved retention efficiency of molecular dyes

“…[8][9][10][11] The focus has, indeed, moved on to layered adsorption membranes made of nanoscaled adsorbents as zeolites, MOFs, graphene oxide and other compounds. [12][13][14][15][16][17][18][19] Considering, for example, nanocellulose based materials, inspired by the concept of thin-lm nanocomposites, both Cao et al 20 and Ma et al 9 introduced into the membranes thin TOCNF layers by casting and impregnating electrospun mats, which were prepared and characterized for ultraltration with pore sizes in the 10-100 nm range. 9,20 TEMPO-oxidised cellulose nanobers (TOCNF) have been established as highly functional and biobased adsorbents for water purication due to their high specic surface area, abundant functionality, high strength and crystallinity.…”

Enhancing the performance of thin-film nanocomposite nanofiltration membranes using MAH-modified GO nanosheets

“…The route (I) is oen preferred because GO demonstrates better dispersibility in aqueous solution than in organic phase. 9,[24][25][26] Lai et al 8 and Wang et al 27 investigated the effect of GO concentration in an aqueous PIP solution on membrane performance and found that TFN NF membrane with embedding an appropriate amount of GO exhibited better membrane performance owing to the remarkable increase in membrane hydrophilicity and surface negativity. Bano et al 28 and Xia et al 29 studied the effect of the GO concentration in an aqueous MPD solution on membrane performance and showed that GO-embedded TFN NF membranes offered higher water uxes and better antifouling properties.…”

Nanocomposite hollow fiber nanofiltration membranes: Fabrication, characterization, and pilot‐scale evaluation for surface water treatment

“…An increase in the concentration of TiO 2 from 0.01 to 0.2% may have confined the diffusion of PIP slowing growth of the nodular structures . Therefore, linkage between monomers used to form the PA layer may be stronger in TFN 0.01 and TFN 0.05 membranes than in TFN 0.2 membranes …”