Ecofriendly Maghemite/Halloysite-like Nanotubes Nanocomposite for Highly Efficient Removal of Cd(II) from Industrial Wastewater

Abstract

Kaolinite is a widely available and inexpensive substance that has been successfully employed to decontaminate different hazardous contaminants from wastewater by adsorption. In this study, halloysite-like nanotubes (HNTs) were prepared via intercalation followed by ultrasonic rolling of the kaolinite layers. Then, maghemite nanoparticles were co-precipitated within the HNTs matrix to produce a maghemite/HNTs nanocomposite (MG@HNTs). XRD, SEM, TEM, FTIR, and a BET analyzer were used to characterize the MG@HNTs nanocomposite, which was then utilized to eliminate Cd(II) from aqueous solutions (water and wastewater). Using a batch methodology, the impact of various adsorption parameters on Cd(II) removal was explored. MG@HNTs nanocomposite exhibited a high adsorption capacity (qe) of 264.47 mg g−1 for Cd (II). The kinetic data well conformed to pseudo-2nd-order, while the adsorption isotherms conformed to the Langmuir model. The desorption study demonstrated that the MG@HNTs nanocomposite could be successfully regenerated and recycled five times, without losing its original removal efficiency. Furthermore, MG@HNTs exhibited effective implementation to remove cadmium from real water samples, including tap and industrial wastewater. This study confirmed the successful application of MG@HNTs as an efficient, eco-friendly, and sustainable adsorbent at a high level of feasibility for the uptake of hazardous contaminants from industrial wastewater.

Functional Ag-EDTA-modified MnO2 nanocoral reef for rapid removal of hazardous copper from wastewater

“…It can be inferred from the high values of R 2 and the low values of RMSE, Δ Q , and χ 2 (Table 5 ) that the experimental equilibrium results of Cu(II) ions using MnO 2 @EDTA or MnO 2 @EDTA-Ag are better described by the Langmuir model than the Freundlich model. Also, the R L values (between 0 and 1) demonstrated favorable adsorption of Cu(II) onto MnO 2 @EDTA or MnO 2 @EDTA-Ag (Mohamed et al 2023 ). Based on the Langmuir isotherm, single-layer adsorption of Cu(II) ions takes place on an even surface of MnO 2 @EDTA or MnO 2 @EDTA-Ag with a limited number of sites for adsorption.…”