Incorporation of zero-valent silver and polyvinyl acetate on the surface matrix of carbon nanotubes for the adsorption of mercury and chromium from industrial wastewater

Abstract

Herein, zero-valent silver (Ag0) and polyvinyl acetate (PVAc) was ultrasonically incorporated into the surface matrix of MWCNTs to produce a multifunctional MWCNTs-Ag0/PVAc nanocomposite. The MWCNTs, MWCNTs-Ag0 and MWCNTs-Ag0/PVAc were characterized for the thermal stability, crystallographic structure and morphology using thermogravimetric analysis (TGA), X-ray diffraction (XRD) and high resolution scanning electron microscopy (HRSEM). Industrial wastewater containing Hg(II) and Cr(VI) ions were treated using the fabricated MWCNTs-Ag0/PVAc at different adsorption parameters such as pH, adsorbent mass, adsorption time and temperature. The characterization result obtained indicated successful incorporation of the Ag0 and PVAc to the surface matrix of MWCNTs-Ag0/PVAc. The materials were thermally stable and the crystalline peaks/patterns of the incorporated materials were evident on the MWCNTs-Ag0/PVAc. The adsorption study revealed maximum adsorption capacity of 249 mg/g and 237 mg/g for the Hg(II) and Cr(VI) by MWCNTs-Ag0/PVAc at the pH (6 for Hg(II) and 3 for Cr(VI)), adsorbent mass (40 mg), adsorption time (60 min) and temperature (30 °C). The experimental data effectively fitted the Langmuir isotherm and pseudo-second order kinetic, respectively. Finally, MWCNTs-Ag0/PVAc showed remarkable performance as a suitable adsorbent for heavy metals removal from industrial wastewater.

Effective removal of malachite green from local dyeing wastewater using zinc-tungstate based materials

“…The removal efficiency (% removal) and the adsorption capacity (q e mg/g) of MG in the local dyeing wastewater using ZnWO 4 and ZnWO 4 @BCN/N nanocomposites were determined using Eqs. (1) , (2) [ 51 ], respectively. where C o (mg/L) and C e (mg/L) are the initial and equilibrium liquid phase concentration, respectively; V (dm 3 ) is the volume of the solution and m (g) is the mass of the nanoadsorbents.…”

Treated Kaolin Clay Incorporated with Nickel Nanoparticles for Enhanced Removal of Crystal Violet and Methyl Orange from Textile Wastewater

“…Numerous methods have been employed to remove dye pollutants from wastewater, including adsorption, Fenton oxidation, photocatalysis, ozonation, membrane techniques, electrodialysis, reverse osmosis, flocculation, and coagulation. − Although a number of these techniques prove to be efficient, they frequently pose difficulties due to their expensive operation and strict compliance requirements. Remarkably, adsorption stands out as a prominent method and is exceptionally effective, eco-friendly, economical, and adaptable when it comes to eliminating toxic and dangerous substances from wastewater. , This approach demands minimal equipment, exhibits fast reaction rates, and possesses an outstanding ability to eliminate various contaminants. As a result, it is a favored option for wastewater treatment.…”

“…Remarkably, adsorption stands out as a prominent method and is exceptionally effective, eco-friendly, economical, and adaptable when it comes to eliminating toxic and dangerous substances from wastewater. 14,15 This approach demands minimal equipment, exhibits fast reaction rates, and possesses an outstanding ability to eliminate various contaminants. As a result, it is a favored option for wastewater treatment.…”