Design of a Novel Sericite–Phosphoric Acid Framework for Enhancement of Pb(II) Adsorption

In this study, phosphoric acid was used to attach anions to the weak interlayer structure of sericite, one of the clay minerals composed of a tetrahedral structure of silicate, to increase the adsorption capacity of cations. Natural sericite beads (NSB) and activated sericite beads with phosphoric a...

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Bibliographic Details
Published in:Molecules (Basel, Switzerland) Switzerland), 2023-11, Vol.28 (21), p.7395
Main Authors: Kim, Han-Soo, Choi, Hee-Jeong
Format: Article
Language:English
Subjects:
Acids
Adsorbents
Adsorption
Analysis
Aqueous solutions
Carbon
clay
Clay minerals
Efficiency
Heavy metals
Hydrogen
kinetic
lead removal
Morphology
Phosphates
Phosphoric acid
Phosphorylation
Pore size
sericite bead
Silicates
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Summary:In this study, phosphoric acid was used to attach anions to the weak interlayer structure of sericite, one of the clay minerals composed of a tetrahedral structure of silicate, to increase the adsorption capacity of cations. Natural sericite beads (NSB) and activated sericite beads with phosphoric acid (PSB) were prepared as beads in order to increase reusability and facilitate the separation of adsorbates and adsorbents. Using this, lead (Pb(II)) removal efficiency from an aqueous solution was comparatively analyzed. The pHpzc was 6.43 in NSB but lowered to 3.96 in PSB, confirming that more acidic functional groups were attached to the PSB surface. According to FT-IR analysis, P=O, P-O-C, P=OOH and P-O-P bonds appeared on the surface of the PSB adsorbent, and the peaks of carboxyl groups and OH-groups were large and broad. The maximum adsorption capacity of Langmuir was 52.08 mg/g for NSB and 163.93 mg/g for PSB. The adsorption process was close to physical adsorption for NSB and chemical adsorption for PSB, and both adsorbents were endothermic reactions in nature in that the higher the temperature, the higher the adsorption efficiency. The adsorption mechanism of Pb(II) to PSB was achieved by ion exchange, electrostatic interaction, hydrogen bonding, and complexation. The adsorption of Pb(II) using PSB was not significantly affected by the adsorption of competing ions and showed a high adsorption efficiency of 94% in reuse up to 6 times. This confirms the favorable feasibility of removing Pb(II) from industrial wastewater using PSB.
ISSN:1420-3049
1420-3049
DOI:10.3390/molecules28217395