Removal of Cu(II) ions from aqueous solution by activated carbon impregnated with humic acid

doi:10.1007/s11783-013-0553-9

Front.Environ.Sci.Eng.

2014, Vol. 8

Issue (3) : 329-336 https://doi.org/10.1007/s11783-013-0553-9

RESEARCH ARTICLE

Removal of Cu(II) ions from aqueous solution by activated carbon impregnated with humic acid

LIU Hanchao,FENG Suping^1,(

),ZHANG Nannan,DU Xiaolin,LIU Yongli

Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan 250100, China

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Abstract

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·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 humic-acid modification that enhanced the Cu(II) adsorption capacity of activated carbon.

Keywords adsorption humic acid activated carbon heavy metal ions

Corresponding Author(s): FENG Suping

Issue Date: 19 May 2014

Cite this article:

LIU Hanchao,FENG Suping,ZHANG Nannan, et al. Removal of Cu(II) ions from aqueous solution by activated carbon impregnated with humic acid[J]. Front.Environ.Sci.Eng., 2014, 8(3): 329-336.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-013-0553-9
https://academic.hep.com.cn/fese/EN/Y2014/V8/I3/329

Tab.1

Fig.1 Distribution of copper species in an aqueous system as a function of pH

Fig.2 FTIR spectra of PAC and PAC-HA

Fig.3 Zeta-potentials of PAC and PAC-HA as a function of pH

Fig.4 Effect of solution pH on Cu(II) uptakes of materials and desorption ratios of humic acid bound on PAC-HA

Fig.5 Effect of contact time on Cu(II) uptake (a) and pH change during the adsorption (b)

Fig.6 Equilibrium isotherms of Cu(II) by PAC and PAC-HA at pH 6

Tab.2

Tab.3

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