Study on Adsorption Performance of New Modified Fly Ash Material to Heavy Metal Polluted Wastewater
Fly ash(FA)is a good adsorption raw material due to its large yield,wide source,low price and porous structure.However,the adsorption capacity of fly ash is limited.In order to further improve the adsorption capacity of fly ash,microwave assisted technology was used to modify fly ash,and the removal rate and adsorption capacity of fly ash to remove Pb2+was quantitatively assessed.The adsorption capacity of Pb2+on fly ash treated by three different ways was investigated,and the effects of experimental temperature,dosage of absorbent,initial mass concentration of solution,pH and adsorption time on the removal of Pb2+by absorbent were also investigated.The results showed that the adsorption capacity of Pb2+on fly ash modified by microwave was stronger than that of fly ash cleaned by distilled water or dilute hydrochloric acid.When the temperature was 30℃,the dosage of absorbent was 6.0 g·L-1,the initial mass concentration was 200 mg·L-1,the pH was 4,and the adsorption time was 120 min,the adsorption effect of Pb2+was the best,the removal rate was 89.56%,the adsorption capacity was 29.853 mg·g-1.In addition,the thermodynamics of the removal of Pb2+by the microwave-modified fly ash was investigated.The adsorption process belongs to physical adsorption.
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