[01] Morlu Stevens, Department of Chemical and Forensic Sciences, Botswana International University of Science and Technology, Palapye, Republic of Botswana. [02] Bareki Batlokwa, Department of Chemical and Forensic Sciences, Botswana International University of Science and Technology, Palapye, Republic of Botswana.

In this work, pulverized vinegar treated fish scales waste was used as a cheap green adsorbent for the simultaneous removal of high levels of arsenic (III) and mercury (II) from industrial wastewater. After mechanical pulverization and sieving of the collected fish scale waste, it was morphologically evaluated employing SEM. The investigation revealed spherical, rough surface particles with sizes of ≤63 µm. The prepared powder was treated with vinegar to functionalize the surfaces of the particles. Optimal adsorption capability of the treated powder was evaluated by investigating the effects of treated material dosage, pH, initial concentration of the selected ions and the contact time via subjecting the treated material to batch adsorption experiments modeled using Minitab 14 software. The investigation results indicated that, the adsorption of the selected metal ions by the vinegar treated fish scale waste was treated material dosage, pH, initial selected ions concentration and contact time dependent. Langmuir isotherm model was best fitted for the adsorption mechanism of the treated material. The obtained optimal capacity of the treated materials per gram was: 36 mg/g and 34 mg/g for arsenic (III) and mercury (II) respectively. It was also shown that adsorption of the selected ions on the treated material was endothermic, spontaneous and in an orderly fashion.

Fish Scales Waste-Remains, Mercury, Arsenic, Wastewater and Adsorption

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