In this study a cost-effective adsorbent
was prepared from phosphate rock waste. An abundant phosphate rock waste was
generated, as by-product, from phosphate concentration processes. Phosphate
rock waste was activated by chemical activators (including different concentration of HNO3 and NaOH or with both). The developed adsorbent
was characterized using different techniques (XRD, XRF and SEM). Batch
experiments were conducted to test the heavy metal ions (Cd+2, Cu+2, Ni+2, Pb+2
and Zn+2) removal efficiency by the developed adsorbent. The adsorption process
was evaluated as a function of various operating parameters such as contact time,
solution pH, temperature, initial metal ion concentration, and adsorbent
dosage. The results concluded that activation phosphate rock waste was
effective with 2M HNO3, and the developed adsorbent is suitable for effective
removal of Cd+2, Cu+2, Ni+2, Pb+2 and Zn+2 from aqueous solution. Initial
uptake of these metal ions increases with time and reaches equilibrium at 60
min, while the optimum adsorbent dosage and solution temperature were 0.5 g 100
mL-1 and 25°C, respectively. The adsorption process was pH-dependent with high
adsorption capacity at pH 7. The experimental isotherms data were analyzed
using the Langmuir, and Freundlich
models. The data obtained from adsorption isotherms of metal ions at
different time fitted well to linear form of Langmuir model.
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