Use of mussel shells for removal of arsenic from water: Kinetics and equilibrium experimental investigation
This study investigated the potential of calcined mussel shells (CMS) as an adsorbent for removing arsenic (As(III) and As(V)) from water using a comprehensive approach incorporating optimization, kinetics, and equilibrium studies. It assessed the impacts of pH, initial arsenic concentration (Ci), a...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-03-01
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| Series: | Results in Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2590123024018309 |
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| Summary: | This study investigated the potential of calcined mussel shells (CMS) as an adsorbent for removing arsenic (As(III) and As(V)) from water using a comprehensive approach incorporating optimization, kinetics, and equilibrium studies. It assessed the impacts of pH, initial arsenic concentration (Ci), adsorbent dose (Ad), and contact time (tc) using response surface methodology (RSM) to maximize the adsorption efficiency. The optimal conditions for As(III) removal were pH of 6.4, Ci = 57.9 mg L−1, Ad = 3.4 g L−1, and tc = 4.4 h, achieving a removal efficiency of 94.9%. For As(V) removal, the optimal conditions were pH of 5.7, Ci = 59.9 mg L−1, Ad = 2.7 g L−1, and tc = 4.9 h, achieving a removal efficiency of 98.5%. Kinetic studies revealed that pseudo-second-order (PSO) model best described As(III) and As(V) adsorption. According to equilibrium isotherm studies, the Langmuir model provided a more accurate representation of the adsorption behavior, indicating monolayer adsorption on the iron oxide–modified calcined mussel shells (IO-CMS) homogenous surface (As(III): qmax = 28.74, R2 = 0.87; As(V): qmax = 31.54, R2 = 0.98). The adsorption process for As(III) and As(V) was spontaneous and endothermic. This work highlights the potential of CMS as an environmentally acceptable and affordable adsorbent for removing arsenic from water. |
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| ISSN: | 2590-1230 |