Novel application of (NH4)2Mo3S13 for vanadium adsorption: Experiments, characterization, kinetic and equilibrium modeling
[Display omitted] •A novel application of (NH4)2Mo3S13 for vanadium removal was developed.•Kinetic and equilibrium adsorption data were quantified at 293–323 K and pH 3.2.•Estimation of the maximum adsorption capacity of this water pollutant.•It was concluded that this adsorbent is very promising fo...
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| Published in: | Separation and purification technology Vol. 329; p. 125210 |
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| Main Authors: | , , , , , , |
| Format: | Journal Article |
| Language: | English |
| Published: |
Elsevier B.V
15-01-2024
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| Subjects: | |
| Online Access: | Get full text |
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| Summary: | [Display omitted]
•A novel application of (NH4)2Mo3S13 for vanadium removal was developed.•Kinetic and equilibrium adsorption data were quantified at 293–323 K and pH 3.2.•Estimation of the maximum adsorption capacity of this water pollutant.•It was concluded that this adsorbent is very promising for water purification.
The adsorption of vanadium on (NH4)2Mo3S13 was analyzed via experimental and theoretical approaches. Kinetic and equilibrium adsorption data were quantified at 293–323 K and pH 3.2. Vanadium kinetics followed a pseudo-first order equation with adsorption rate constants ranging from 0.006 to 0.032 min−1, while the maximum experimental vanadium adsorption capacities ranged from 9.9 to 362 mg/g under tested operating conditions. Equilibrium data were fitted by a monolayer model that considered that the vanadium ions were removed via two different active sites of (NH4)2Mo3S13 surface. These adsorption sites were related to the Mo moieties of this material. The calculated adsorption capacities of these active sites followed the next trend: Q1 (293 K) > Q2 (293 K), Q2 (303 K) > Q1 (303 K) and Q2 (313 K) > Q1 (313 K). In particular, the calculated saturation vanadium adsorption capacities were 124 – 376 mg/g. The impact of adsorption temperature on the calculated number of vanadium ions that were adsorbed by both active sites was also studied. It was concluded that the temperature facilitated the adsorption of vanadium ions via the first active site of (NH4)2Mo3S13 surface, while an opposite trend was identified regarding the second type of active site. The interaction energies involved in the adsorption of both active sites were also calculated. These results indicated that both sites contributed in different degree to reduce the vanadium concentrations in the aqueous solutions for depollution purposes. Overall, this study provides useful insights on the vanadium adsorption mechanism for an alternative and competitive adsorbent, which is promising to be implemented in large-scale water purification systems. |
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| ISSN: | 1383-5866 1873-3794 |
| DOI: | 10.1016/j.seppur.2023.125210 |