Fabrication of polyamide-12/cement nanocomposite and its testing for different dyes removal from aqueous solution: characterization, adsorption, and regeneration studies

Abstract

Polyamide-12/Portland cement nanocomposite was prepared by using the exfoliated adsorption method. The fabricated nanocomposite was applied first time to remove Congo red (CR), brilliant green (BG), methylene blue (MB), and methyl red (MR) from the synthetic wastewater. The polymer nanocomposite was characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, energy-dispersive X-ray spectroscopy, elemental mapping, Brunauer–Emmett–Teller surface area analysis, and X-ray diffraction. The adsorption was rapid and all the studied dyes were absorbed on the surface of the polymer nanocomposite in 90 min. The point of zero charge was found at pH 5 and the factors such as pH, time, and temperature were found to affect the adsorption efficiency. Freundlich isotherm and pseudo-second-order models well-fitted the adsorption isotherm and kinetics data, respectively. The calculated maximum adsorption capacity was 161.63, 148.54, 200.40, and 146.41 mg/g for CR, BG, MB, and MR, respectively. The mode of the adsorption process was endothermic, spontaneous, and physical involving electrostatic attraction. On an industrial scale, the high percentage of desorption and slow decrease in the percentage of adsorption after every five regeneration cycles confirm the potential, practicality, and durability of the nanocomposite as a promising and advanced adsorbent for decolorization of colored wastewater.

The effective treatment of dye-containing simulated wastewater by using the cement kiln dust as an industrial waste adsorbent

“…11 and Table 2 reveal that the kinetic data are best fitted and in excellent agreement with the pseudo–second–order kinetic model at all times along the whole adsorption process rather than the other studied models. This is in agreement with a previous study that used the cement nano-composite in the adsorption of both MB and CR dyes 48 . The regression coefficient (R 2 ) for the model is higher than 0.997, very near to the unit, and it is not only dependent on the initial concentration of the dye 49 .…”

Photocatalytic Degradation of Methyl Green Dye Mediated by Pure and Mn-Doped Zinc Oxide Nanoparticles under Solar Light Irradiation

“…Instead, similar bandgap widening has been attributed to Burstein-Moss effect which is widely reported (for ZnO) in literature [25,63,64]. Nevertheless, based on the efficient absorption of pure and Mn-doped ZnO in the The Brunauer-Emmett-Teller (BET) method is ubiquitously utilized in nanotechnology and is envisaged to be an ideal experimental tool to estimate the specific surface area of the nanomaterials [65]. In the present study, a linear BET multipoint plot of 1/½WðP/P o Þ − 1 vs. P/P o has been obtained for both pure and Mn-doped ZnO photocatalysts.…”

“…The Brunauer–Emmett–Teller (BET) method is ubiquitously utilized in nanotechnology and is envisaged to be an ideal experimental tool to estimate the specific surface area of the nanomaterials [65]. In the present study, a linear BET multipoint plot of 1 / ][ W )( P / P o − 1 vs. P / P o has been obtained for both pure and Mn-doped ZnO photocatalysts.…”

Application of carbon from pomegranate husk for the removal of ibuprofen, cadmium and methylene blue from water

“…Ternes et al [ 16 ] reported that conventional methods, including oxidation, flocculation and coagulation, ion exchange, phytoremediation and sedimentation, are ineffective in eliminating the abovementioned substances from wastewater. On the other hand, the non-conventional method of adsorption is more effective and efficient [ [17] , [18] , [19] , [20] , [21] ]. The presence of benzene rings and functional groups on the structures of IBU and MB enhances the ability of carbonaceous material derived from agricultural waste to adsorb these substances from water [ 22 , 23 ].…”