Performance research on arsenic adsorption from aqueous solution by aluminum-modified fly ash cenospheres
An environmental material, aluminum-modified fly ash cenospheres, was synthesized by using composite means of wet and dry method. Static adsorption experiments were conducted to examine the effects of adsorbent dosage, pH, ionic strength, competing anions, reaction time and temperature on As(V) removal from aqueous solutions. Results showed that the best As(V) adsorption was observed in the range of neutral and acidic, and the coexisting ions had a large impact on As(V) adsorption in order comprehensive > H2PO4-> CO32-, and ionic strength had little influence on As(V) removal, and the maximum adsorption capacity of aluminum-modified fly ash cenospheres is about 5000ug/g (temperature 298K;adsorbent dosage 2.5g/L;time 24h). Experimental data of As(V) adsorption fitted well with the Langmuir adsorption isotherm and indicated the better applicability of the pseudo-second-order model.
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维普
