Abstract
To remove chelated heavy metal ions more efficiently without the addition of flocculant, a new type of poly-dithiocarbamate containing compounds, namely poly-ammonium dithiocarbamate (PADTC) and poly-sodium dithiocarbamate (PSDTC) with different degrees of polymerization (DP) were synthesized. Under the adsorption condition of pH at 6, PADTC dosage of 0.1 g, reaction time at 20 min, and initial metal ion concentration at 100 mg/L, PADTC exhibited its maximal adsorption capacities for chelated Cu2+, Ni2+ and Zn2+ being 245.53, 234.47, and 226.76 mg/g, respectively. Besides, the combinative strength of heavy metal ions with different chelating agents is in the increasing order tartaric acid (TA), citric acid (CA), and ethylenediaminetetraacetic acid (EDTA). Noticeably, removal efficiency of PSDTC for EDTA-Ni and EDTA-Zn reached 99.93% and 99.13% at the DP of 33, respectively. Moreover, the adsorption process of PADTC for Cu2+, Ni2+ and Zn2+ are typical Langmuir mono-molecular layer adsorption and their kinetic model follows the Pseudo-second-order, as the both coefficients of determination (R2) reached 0.99, while the thermodynamic parameters indicated that the endothermic nature of adsorption and the process happened spontaneously. Finally, adsorption of chelated heavy metal ions by C = S of PADTC and PSDTC was characterized using FTIR Spectrometer and X-ray photoelectron spectroscopy (XPS). Therefore, removal of heavy metal ions from metal processing/electroplating wastewater using PADTC or PSDTC might be of industrial potential.
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