Adsorption Effect of Cetyltrimethyl-ammonium Bromide Modified Fly Ash on Methyl Orange Waste Water

Fly ash is a solid waste from power plant, which will pollute the environment if not handled properly. The modification of fly ash as an adsorbent is an ideal method of resource utilization. In this paper, fly ash was firstly treated with cetyltrimethy-lammonium bromide (CTAB), and then further stabilized to obtain the final adsorbent product. The proper treating conditions are obtained: mass ratio of CTAB to fly ash 0.017, modification temperature 32°C, and time 1 h. The removal rate for methyl orange with the modified fly ash stabilized by drying at 100 °C is up to 93.2 %, which is higher than that calcined at 500 °C. The adsorption effect of the modified fly ash is much better than that of unmodified fly ash. (paper)