| الوصف: |
In the current work a highly efficient prickly pear peel activated carbon, PPPAC, adsorbent has been prepared from locally available prickly pear peel for the removal of toxic hexavalent chromium and divalent lead ions from synthetic wastewater. In order to evaluate the optimum conditions for the adsorption the effect of carbonization temperature, carbonization time, solution pH, contact time and adsorbent dosage are carefully studied based on AAS, FTIR, SEM, PZC and adsorption efficiency. The results from batch adsorption studies were showed that the adsorption efficiency of both chromium and lead onto PPPAC adsorbent was influenced by carbonization time, temperature, solution pH, contact time and adsorbent dosage. The PPPAC adsorbent, which was found to have significantly higher efficiency in chromium and lead removal was synthesized using carbonization time and carbonization temperature of 1 hour and 600 C, respectively. The highest Cr (VI) and Pb (II) uptake were obtained at adsorbent dose of 15 mg/50mL with removal efficiency of 99.8 % and 88.92 %, respectively and achieved at pH 3 and contact time of 30 min for Cr (VI), and at pH 5 and a contact time of 40 min for Pb (II), both from 0.5 mg/L of the respective metal solutions. |