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. 2022 Nov 7;27(21):7635.
doi: 10.3390/molecules27217635.

Fabrication of Novel Bentonite-Anthracite@Zetag (BT-An@Zetag) Composite for the Removal of Arsenic (V) from an Aqueous Solution

Mohamed R El-Aassar  1 , Ahmed K Alezbaway  2 , Ibrahim O Althobaiti  3 , Mohamed Y El-Sayed  1 , Hend S Abu Salem  4 , Hassan M A Hassan  1 , Rawan F Alolaimi  1 , Emam F El Agammy  5 , Mohamed S Mohy-Eldin  6 , Fathy M Mohamed  7
Affiliations

Fabrication of Novel Bentonite-Anthracite@Zetag (BT-An@Zetag) Composite for the Removal of Arsenic (V) from an Aqueous Solution

Mohamed R El-Aassar et al. Molecules. .

Abstract

The arsenic (As) pollution of water has been eliminated via intensive scientific efforts, with the purpose of giving safe drinking water to millions of people across the world. In this study, the adsorption of As(V) from a synthetic aqueous solution was verified using a Bentonite-Anthracite@Zetag (BT-An@Zetag) composite. The SEM, FT-IR, XRD, DSC, TGA, and SBET techniques were used to characterize the (BT-An@Zetag) composite. The adsorption of As(V) was explored using batch adsorption under varied operating scenarios. Five kinetic modelswere used to investigate kinetic data, whereas three isotherms had been used to fit empirical equilibrium data. According to the findings, the adsorption mechanism of As(V) was best described by the Freundlich isotherm with a maximum monolayer coverage of 38.6 mg/g showing pseudo-second-order mode. The estimated enthalpy (H°) indicates that the adsorption process is both chemical and endothermic.The calculated free energy (G°) indicates that the reaction is nonspontaneous. After four sequential adsorption cycles, the produced BT-An@Zetag composite demonstrated good reusability and a greater adsorption affinity for As(V) ions. Overall, the BT-An@Zetag composite is suited for removing arsenic from wastewater using adsorption as a cost-effective and efficient technique.

Keywords: As(V); anthracite; arsenic; bentonite; composites; water pollutant; water treatment; zetag.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
(A) XRD pattern, (B) TGA, (C) DSC, and (D) Raman spectra of the BT-An@Zetag composite.
Figure 2
Figure 2
Scanning electron microscopy with the energy-dispersive X-ray spectroscopy (SEM-EDX) analysis of the BT-An@Zetag composite (a–d).
Figure 3
Figure 3
(a) N2adsorption/desorption isotherms curves of the BT-An@Zetag composite obtained from the nitrogen gas, and (b) the BJH pore size distribution of the BT-An@Zetag composite.
Figure 4
Figure 4
(A) The effect of solution pH on As(V) adsorption by BT-An@Zetag composites (Concentration: 50 mg/L, adsorbent weight: 20 mg, contact time: 120 min, and agitation speed: 200 rpm at 25 °C), and effect of (B) adsorbent doze, (C) agitation speed, and (D) initial concentration on As(V) adsorption by the BT-An@Zetag composite.
Figure 5
Figure 5
(a) Effect of time, (b) pseudo-first-order, (c) pseudo-second-order models for the adsorption of As(V) by the BT-An@Zetag composite.
Figure 6
Figure 6
(a) Intraparticle-diffusion models and (b) the Van’t Hoff plot on the adsorption process of As(V) by BT-An@Zetag composite.
Figure 7
Figure 7
RAdsorption isotherm models of (a) Langmuir, (b) Freundlich, and (c) Temkin of As(V) by the BT-An@Zetag composite.
Figure 8
Figure 8
Reusability of BT-An@Zetag adsorbent composite.
Figure 9
Figure 9
Mechanism of the As(V) adsorption by the BT-An@Zetag adsorbent composite.
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