关键词: 脱硫石膏(FGDG);重金属离子;吸附;脱吸附

Abstract: The use of industrial waste desulfurization gypsum (flue gas desulfurization gypsum, FGDG) as a adsorbent, under the condition of static adsorption, the adsorption process of FGDG on various heavy metal ions and the coexistence of various heavy metal ions were investigated from the aspects of temperature, pH value.Based on the influence of the hydration radius and the electric charge on the adsorption process, a mass transfer model is proposed.In the system of the existence of multiple heavy metal ions, the hydration radius and charge size have a significant effect on the competitive adsorption results, the competitive ability of five heavy metal ions as the follows: Pb2+＞Cr3 +＞Cd2 +＞Mn2+＞Cu2+.The Langmuir model infers that chemical adsorption is mainly a single layer adsorption process in adsorption model, and Freundlich model can describe FGDG and heavy metal ions physical adsorption belongs to multilayer adsorption process.After XRD analysis, FGDG and heavy metal ions can form Cu-S, Cd-S, Cr-S, Mn-S, Pb-S.

Key words: desulfurized gypsum(FGDG);heavy metal ion;adsoption;desortion