Activated Carbon from Fly Ash of Heavy Fuel Oil: Characterization and its Utilization for Removal and Determination of Chlorophenonls in Water

摘要

Activated carbons (AC) prepared from volatile fly ash (FA) of heavy fuel oil via gasification with combined steam - C0_2 was characterized and used as a low- cost adsorbent for removal of chlorophenols (CPs) e.g. 2-chlorophenol (2-CP), 4-chlorophenol (4-CP), and 2,4,6- tetra chlorphenol (TCP) in water. At pH< 2.0，maximum CPs uptake was achieved and the average half-life time (t_(1/2)) of the equilibrium adsorption of CPs was in the range 0.80 ± 0.01-1.1 ± 0.04 h. Data suggested use of AC in packed column for separation and determination of various concentrations (0.5-100 μgL~(-1)) of CPs in water (0.5-1.0 L). Complete extraction and recovery (97.4 ± 2.9 %, n=5) of CPs were achieved at 2 mL min~(-1) flow rate. Analysis of CPs spiked onto tap- and seawater were also analyzed by AC packed column and the results were compared with the standard HPLC method at 95% confidence (P-0.05, n=5). The experimental student t test (iexp 1.81-1.93) and F (Fexp 1.21-5.76) values were lower than the tabulated t ffcrit. = 2.78) and F (6.38), respectively. AC packed column provides remarkable selectivity, reproducibility, and cost-effectiveness towards removal and/ or determination of CPs. AC adsorbent may serve positively in point-of-care use.