Effect of Polyacrylic Acid on the Adsorption of Cd onto Natural Biofilms

doi:10.3969/j.issn.0251-0790.2012.09.023

Abstract

Abstract:

Dissolved natural organic matters(DNOM) usually have significant effects on the behavior of trace metals in aquatic environment. As an important solid material existing wildly in natural waters, natural biofilm also affect the behavior of trace metals remarkably, by the action of adsorption. In this study, polyacrylic acid(PAA) was selected as a surrogate for macromolecular DNOM to investigate the effect of DNOM on the adsorption of Cd by natural biofilms. Cd adsorption to natural biofilms without PAA and with different concentrations of PAA was carried out. The influences of solution pH value and component addition sequence on the effect of PAA were also measured. The presence of PAA generally decreased the adsorption of Cd, and the effect was influenced by the concentration of PAA, the solution pH value, the adsorption sequence and the thickness of the biofilms. Higher concentration ratio of PAA to Cd or higher pH value usually resulted in more significant decreasing effect on adsorption. The influence of adsorption sequence on the effect of PAA was insignificant in lower pH range, while in higher pH range, the decreasing effect of PAA on adsorption was more considerable for simultaneous adsorption and PAA first adsorption, than for Cd first adsorption. As to the thickness of biofilms, the effect of PAA was usually significant for thinner biofilms. The role of PAA on adsorption could be attributed to the competition between PAA and the biofilms for available Cd, and to the formation and adsorption of ternary surface complexes. Higher pH value facilitated the complexation between PAA and Cd, and impeded the adsorption of negatively charged complexes on the biofilms.

Key words: Natural biofilm, Adsorption, Cd, Polyacrylic acid(PAA), Natural organic matter

CLC Number:

O647.3
X132

TrendMD:

HUA Xiu-Yi, DONG De-Ming, JIANG Xu, HU Jin-Rui, GUO Zhi-Yong, LIANG Da-Peng. Effect of Polyacrylic Acid on the Adsorption of Cd onto Natural Biofilms[J]. Chem. J. Chinese Universities, 2012, 33(09): 2005.

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