PREPARATION OF ADSORBENT FROM PHOSPHATE ROCK WASTE TO BE USED FOR THE REMOVAL OF HEAVY METAL IONS...

A cost-effective adsorbent was made from phosphate rock waste in this work. Phosphate concentration techniques produced a large amount of phosphate rock waste as a by-product. Chemical activators were used to activate phosphate rock waste (including different concentration of HNO3 and NaOH or with both). Various methodologies were used to characterise the produced adsorbent (XRD, XRF and SEM). Batch tests were carried out to see how effective the created adsorbent was at removing heavy metal ions (Cd+2, Cu+2, Ni+2, Pb+2, and Zn+2). Contact time, solution pH, temperature, initial metal ion concentration, and adsorbent dosage were all studied as a function of various operating parameters. The results showed that activating phosphate rock waste with 2M HNO3 was effective, and the adsorbent generated is suitable for removing Cd+2, Cu+2, Ni+2, Pb+2, and Zn+2 from aqueous solution. The initial uptake of these metal ions rises with time and achieves equilibrium at 60 minutes, with 0.5 g 100 mL-1 adsorbent dosage and 25°C as the optimum adsorbent dosage and solution temperature, respectively. The adsorption process was pH-dependent, with pH 7 having the highest adsorption capacity. The Langmuir and Freundlich models were used to examine the experimental isotherm data. The findings from metal ion adsorption isotherms at various times fit well with the linear form of the Langmuir model.

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