283 publications from this institution
In this paper, reduced graphene oxide (rGO) nanosheet from graphite was synthesized using the top‐down approach. The surface of rGO was modified by cetyltrimethylammonium bromide (CTAB) to prepare rGO/CTAB adsorbent for anionic dye removal. The prepared rGO/CTAB was characterized by XRD, FTIR, FE‐SEM and TGA. The operation parameters (surfactant concentration, adsorbent dosage, pH and initial concentration of dye solution) affecting the batch adsorption process to remove direct red 80 (DR80) and direct red 23 (DR23) were studied in detail. The dye adsorption capacity of rGO/CTAB was 213 and 79 mg/g for DR80 and DR23, respectively. In addition, dye removal followed the Langmuir isotherm with pseudo‐second order reaction kinetics.
Herein, zeolitic imidazolate framework (ZIF-8) - Polyvinylpyrrolidone (PVP) - Polyethersulfone (PES) composites (ZPP) with different amounts of ZIF-8 (1%, 2% and 3% denoted as ZPP-1, ZPP-2 and ZPP-3, respectively) were prepared. ZIF-8 particles have been synthesized individually. Then they are mixed with PES and PVP/PES and converted into membrane films. The materials including ZIF-8, PES, PVP/PES, ZPP-1, ZPP-2 and ZPP-3 were characterized by FTIR, XRD, AFM, SEM, BET, TEM, contact angle, and optical microscopy. The prepared membrane was used to remove Malachite green (MG) using a cross flow system. The outcomes showed that the ZPP hybrid membrane had higher dye removal ability. The membrane is made in an optimum state of 99.6% of the Malachite green (MG) removal from the wastewater at a flow rate of 12.42 L/m2 h. These results indicate that the ZPP membrane prepared in this way without the need for any special preparation can be a good option for the dye removal process. The prepared membranes have good efficiency and stability under different operating pressures.
