A novel graphene oxide−silica (GO−SiO 2 )embedded polyamide nanofiltration (NF) membrane was successfully constructed by the interfacial polymerization reaction between piperazine (PIP) and trimesoyl chloride on the surface of a polysulfone (PSF) microporous support. In order to improve the water flux and enhance the antifouling property, GO−SiO 2 nanocomposites were dispersed in PIP solution. Scanning electron microscopy (SEM), atomic force microscopy (AFM), and water contact angle were used to characterize the prepared membranes. The results showed that the surface properties of nanocomposite NF (TFN-NF) thin films had the tendency of more hydrophilicity and smoothness. The surface contact angle (53.7°) and surface roughness (R a = 5.68, R a = 7.06) of the TFN-NF membrane containing 0.01 wt % GO−SiO 2 were the lowest. Furthermore, 0.01 wt % GO−SiO 2 /TFN showed the superior separation performance that the water flux was 43.55 L m −2 h −1 and salt rejection for NaCl, Na 2 SO 4 , MgSO 4 were 40.7, 93.2, 82.4%, respectively. Also, the separation performance of the TFN-NF membrane containing 0.01 wt % GO−SiO 2 was further compared with other TFN-NF membranes prepared by previous studies. Besides, after filtration of bovine serum albumin solution, the normalization of the flux of the TFN-NF membranes is 0.83, which has an improvement of 23.88% when compared with that of the bare NF membrane. The result above indicates that the modified membrane shows a better antifouling property than the TFC-NF membrane.
In this paper, graphitic‐phase carbon nitride (g‐C3N4) was prepared from urea and detected by FTIR, XRD, SEM, TEM, Boehm titration, zeta potential, and N2 adsorption‐desorption analyzes, demonstrating that g‐C3N4 possesses a thin sheet structure, negative surface, and strong alkalinity. Considering the alkaline groups and huge areas, g‐C3N4 was employed to adsorb perfluorooctanoic acid (PFOA). The adsorption capacity of g‐C3N4 towards PFOA was evaluated by batch adsorption experiments, indicating the considerable adsorption capacity of 120.879 mg g−1. The isothermal models and kinetic models were also performed in order to study the adsorption process, proving that PFOA adsorption was fitted by the Langmuir isothermal model and pseudo second‐order model. In addition, residual PFOA concentration after adsorption was determined by high performance liquid chromatography (HPLC) with a fluorescence detector after being derived with 3‐(2‐bromoacetyl) coumarin (3‐BrAC). The HPLC fluorescent detection showed satisfied linearity from 0.5 to 20.0 ug mL−1 with a sound R
2 of 0.9992. This is the first time that g‐C3N4 was applied to PFOA adsorption from aqueous solutions with outstanding adsorption capacity.
A novel salicylic acid (SA) molecularly imprinted polymer (MIP) has been synthesized successfully by surface imprinting technique based on SBA-15 nanoreactor. The SBA-15, selected as the nanoreactor for immobilizing of...
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