Use of chitosan microspheres as remedial material for acidity and iron (III) contents of coal mining wastewaters.
Chitosan microspheres are highly effective in neutralizing the acidity of wastewaters from coal mining. The saturation capacity for the formation of a superficial monolayer on the adsorbent was interpreted using Langmuir isotherm and considering the amino groups as the adsorption sites for hydronium ions. The saturation capacity of the surface of the static system was 0.428 mol kg(-1), higher than that of the dynamic one. This value corresponds to the neutralization of 135 liters of wastewater per kilogram of microspheres. One gram of chitosan microspheres was capable of increasing wastewater pH from 2.5 to 4.0 and removing approximately 100% of its iron (III) contents.
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Departamento de Química, Universidade Federal de Santa Catarina, Florianópolis 88040-900, Santa Catarina, Brazil.
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Laranjeira
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Martins
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D000327:Adsorption; D002686:Chitin / Q000031:analogs & derivatives* / Q000737:chemistry*; D048271:Chitosan; D003031:Coal; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste; D007501:Iron / Q000737:chemistry* / Q000302:isolation & purification*; D008863:Microspheres; D008906:Mining; D014865:Waste Disposal, Fluid / Q000379:methods*; D018508:Water Purification / Q000379:methods*
D003031:Coal; D007220:Industrial Waste; D002686:Chitin; D048271:Chitosan; D007501:Iron