Removal of Arsenic(V) from wastewater using calcined eggshells as a cost-effective adsorbent.

IF 3.4 3区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES

Heliyon Pub Date : 2025-02-06 eCollection Date: 2025-02-15 DOI:10.1016/j.heliyon.2025.e42505

Pratikshya Poudel, Davi Lal Parajuli, Srijana Sharma, Janaki Baral, Megh Raj Pokhrel, Bhoj Raj Poudel

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Abstract

This study investigates calcined eggshells (CES) as an effective adsorbent for the remediation of As(V). Characterization of CES was performed using zeta potential analysis, FTIR, XRD and SEM-EDX. Batch studies were conducted to examine the effects of pH, adsorption kinetics, and adsorption isotherms to assess efficacy. The adsorption of As(V) followed the Langmuir isotherm and pseudo-second-order kinetics, with a maximum capacity of 91.05 mg g⁻¹ at pH 6.0 and 298 K. The presence of additional anions such as chloride, sulfate, or nitrate had no significant impact on the biosorption of arsenate. However, the introduction of phosphate ions notably decreased the rate of arsenic adsorption. CES was easily regenerated with an alkaline solution and showed excellent reusability over four cycles. Thermodynamic studies confirmed the spontaneity and feasibility of the biosorption process. This study highlights that CES is a promising adsorbent for As(V) removal from contaminated water.

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来源期刊

Heliyon MULTIDISCIPLINARY SCIENCES-

CiteScore

4.50

自引率

2.50%

发文量

2793

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