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Vol. 35 No. 5 (2023): Vol 35 Issue 5, 2023

Batch Adsorption Study: Sequestration of Cr(VI) ions from Aqueous Solution Utilizing Boerhavia diffusa

https://doi.org/10.14233/ajchem.2023.27804
Deva Nand Sharma
Department of Chemical Engineering, Deenbandhu Chhotu Ram University of Science & Technology, Murthal-131039, India
https://orcid.org/0000-0001-8474-8478
Anil Yadav
Department of Chemical Engineering, Deenbandhu Chhotu Ram University of Science & Technology, Murthal-131039, India
https://orcid.org/0000-0002-4537-014X

Corresponding Author(s) : Anil Yadav

anilyadav.che@dcrustm.org

Asian Journal of Chemistry, Vol. 35 No. 5 (2023): Vol 35 Issue 5, 2023

Abstract

In light of the ongoing contamination of water sources by aqueous waste from the electroplating, printing, pharmaceutical, dye and alloy industries, this work describes a new adsorbent for removing chromium ions (Cr(VI)) from a lab-prepared aqueous solution. As an adsorbent, pure and activated form of Boerhavia diffusa (abbreviated as RBD and ACBD), also known as Punarnava (in Hindi), was utilized. The adsorbents were characterized for their structure, morphology and thermal analysis through X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and thermal gravimetric analysis (TGA). The FTIR spectrum detected various functional groups viz. -OH, -CHO, RCO, -CN and C=H, implying strong bonding with metals ions. The amorphous and porous character of the adsorbent was confirmed by SEM and XRD. Consequences of other domains, including adsorbent dose, contact time, pH, concentration and temperature, were also investigated. With a starting concentration of 20 mg/L, pH of 7 (RBD), 5 (ACBD), adsorption dose of 20 mg and temperature of 303 K, the effective adsorption was achieved after 2 h and these were 86.4% and 92.7% in terms of removal efficiency by RBD and ACBD, respectively. The respective monolayer maximum adsorption capacity for RBD and ACBD were 66.28 mg/g and 135.81 mg/g. The Langmuir and pseudo-second order reactions were well-matched the experimental results for RBD and ACBD precisely.

Keywords

Isotherm Kinetics Boerhavia diffusa Adsorption capacity Thermodynamics
Sharma, D. N., & Yadav, A. (2023). Batch Adsorption Study: Sequestration of Cr(VI) ions from Aqueous Solution Utilizing Boerhavia diffusa. Asian Journal of Chemistry, 35(5), 1161–1168. https://doi.org/10.14233/ajchem.2023.27804
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