Journal
FRONTIERS OF ENVIRONMENTAL SCIENCE & ENGINEERING
Volume 8, Issue 3, Pages 329-336Publisher
HIGHER EDUCATION PRESS
DOI: 10.1007/s11783-013-0553-9
Keywords
adsorption; humic acid; activated carbon; heavy metal ions
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Humic acid (HA) was impregnated onto powdered activated carbon to improve its Cu(II) adsorption capability. The optimum pH value for Cu(II) removal was 6. The maximum adsorption capacity of HA-impregnated activated carbon was up to 5.98 mg center dot g(-1), which is five times the capacity of virgin activated carbon. The adsorption processes were rapid and accompanied by changes in pH. In using a linear method, it was determined that the equilibrium experimental data were better represented by the Langmuir isotherm than by the Freundlich isotherm. Surface charges and surface functional groups were studied through zeta potential and FTIR measurements to explain the mechanism behind the humicacid modification that enhanced the Cu(II) adsorption capacity of activated carbon.
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