Abstract
ABSTRACT In this study, thioacetamide (TAA) was used as the precipitant to selectively precipitate Cu2+, Cd2+, and Pb2+ in acidic solution. The effect of temperature, time, and pH conditions on the selective precipitation of metal ions were investigated. Meanwhile, the thermodynamic process of single metal precipitation was studied by Avrami equation. By continuously and accurately controlling pH, Cu2+, Cd2+, and Pb2+ were successfully precipitated at pH 2.5, 4.0, and 6.5, respectively. Traditional inorganic sulfide precipitator Na2S was also used to compare with TAA under the same conditions, and the results showed that compared with Na2S, TAA could be better to achieve the goal of selective precipitation of Cu2+, Cd2+, and Pb2+. The metal sulfide precipitation was measured by field emission scanning electron microscopy (FE-SEM) and X-ray diffraction (XRD).
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