Analysis of the electric charge properties of biofilm for the development of biofilm matrices as biosorbents for water pollutant

Abstract

Biofilms are the predominant habitats of microbes and have been suggested as potential biosorbents for water pollutants. The electric charges of extracellular polymeric substances (biofilm polymers) are essential characteristics of biofilms as promising biosorbents. In order to clarify the electric charge properties along with biofilm formation, the electrophoretic mobilities of biofilms formed on stones after 15, 30, and 60 formation days collected from Lahor Reservoir, Indonesia, were analyzed, as were the Fourier-transform infrared spectra. In addition, the adsorptions of Cu(II) by mature biofilms at different pH (pH 9, 7, 5) were also investigated. The results indicated the amount of Cu(II) adsorbed to the biofilms differed at various pH values (i.e., 92, 73, and 21 μmol/g at pH 9, 7, and 5, respectively). The greatest amount of Cu(II) at pH 9 may have been due to the abundance of the negatively charged sites in the biofilm polymers, in natural aquatic ecosystems. Such electric charges should be considered to utilize biofilms as biosorbents for water pollutants, such as heavy metals.

Keywords

Biofilm / Microbial ecology / Biosorbent / Electric charge properties / Water pollutant

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Funding

Direktorat Jenderal Pendidikan Tinggi