2,4-dichlorophenoxyacetic acid adsorption from contaminated water through activated carbon reclaimed with zero-valent iron and titanium dioxide

The sol-gel method was used to synthesize zerovalent iron/titanium dioxide supported on activated carbon (fe0/tio2/ac) adsorbent and the adsorbents were comprehensively characterized by xrf, xrd, ftir, bet, fesem and edx analysis. the batch experiments were performed to evaluate the effect of adsorbent type, ph of solution, pollutant initial concentration and contact time on the 2,4-dichlorophenoxyacetic acid (2,4-d) adsorption efficiency. the equilibrium experiments revealed that the langmuir isotherm was good fitted to the adsorption equilibrium data, whereas; the adsorption kinetic experiments indicated that the adsorption procedure was excellent described through a pseudofirstorder kinetic model. the obtained maximum adsorption capacities from langmuir isotherms of 86.5, 87.5, 86,57 and 88.76 mg/g were achieved for activated carbon (ac), zerovalent iron/activated carbon (fe0/ac), titanium dioxide/activated carbon (tio2/ac) and fe0/tio2/ac at the 2,4d initial concentration of 90 mg/l, ph=4 and 25 ℃, respectively.