Tayto Mindahun
This study aimed to prepare AC from flax straw and investigate its potential for the removal of Pb (II) ions from aqueous solution and real industrial wastewater. AC was prepared by chemical activation method using H3PO4 as activating agent. The effects of initial Pb (II) ion concentration, adsorbent dose, contact time and pH on the removal efficiency were studied by using aqueous solution prepared from Lead nitrate (Pb (NO3)2) on a batch mode. Response surface methodology was used in order to carry out experimental runs. The collected wastewater sample was characterized before and after treatment according to APHA methods. Activated carbon was characterized and results showed that the flax straw AC had 8.04% of moisture, 6.04% of ash, 18.615% of volatile matter, 79.421% of fixed carbon, 459.807 mg/g of iodine number and surface area of 489.455 m2/g. Physico-chemical characteristics showed that raw wastewater had a concentration of 3.95 mg/L Pb (II), 158.52 mg/L BOD5, 2482 mg/L COD, and 652.667 mg/L TSS. The highest removal efficiencies of Pb (II) metal ion which was achieved from aqueous solution and paint wastewater were found to be 95.16% and 78.73%, respectively. The experimental data are fitted with pseudo-second order model and adsorption of Pb (II) on flax straw AC fits the model of Langmuir very well. The results of the study suggested that flax straw AC can be used as an adsorbent for the removal of Pb (II) ion from industrial wastewaters.
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