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Performance of ultrasonic-assisted synthesis of date stones activated carbon for copper ions removal from aqueous media and electroplating wastewater

Copper (Cu2+) is found in various industrial wastewaters and has been associated to environmental and health adverse effects. The aim of this paper was to evaluate the adsorption property of ultrasonic-assisted- synthesized adsorbent prepared from date stones for copper ions elimination from aqueous solution. Physicochemical characteristics of the adsorbent including surface morphology, specific surface area, pore volume, functional groups, and pHzpc were determined. The adsorbent showed a high specific surface area of 512.38 m2 g−1, pore volume of 0.314 cm3 g−1, and the mean pore diameter of 26.6 nm. The effect of pH (3, 5, 6), adsorbent dose (0.25–4 g L−1), and contact time (3–60 min) on the copper adsorption was investigated. The copper adsorption by studied adsorbent was dependent on pH and the maximum removal was achieved at the solution pH of 6. The copper concentration of 40 mg L−1 was completely removed at the adsorbent dosage of 3 g L−1 and the contact time of 30 min. The equilibrium study was observed to conform with the Langmuir model (R2 = 0.997 and qmax = 188.67 mg g−1). Adsorption data were suitably described by the pseudo-second-order kinetic model (R2 > 0.99). Besides, used mesoporous activated carbon could be effectively reused for at least five times after treatment with HCl solution.