Abstract：The performance of dithiocarboxyl hydroxymethy-polyacrylamide (DTMPAM) in the treatment of Cr(VI)-containing wastewater was investigated with the influences of some parameters, such as DTMPAM dosage, pH value, initial concentration of Cr(VI), and coexisting turbidity, inorganic and organic substances. The results showed that DTMPAM had a good removal efficiency on Cr(VI) in water samples with different initial concentrations of Cr(VI) under acidic conditions, and the removal rate of Cr(VI) increased with the decrease of initial pH in the system. At pH value 3.0, the highest removal rates of Cr(VI) in water samples reached 94.78%, 96.52%, 96.53% and 97.49% at the initial Cr(VI) concentrations of 5, 15, 25 and 50mg/L, respectively. The coexisting turbidity had an inhibitory effect on the removal of Cr(VI) by DTMPAM. At the low DTMPAM dosage, the coexisting inorganic cations (K+, Na+, Ca2+ and Mg2+), the coexisting inorganic anions (SO42-, NO3- and Cl-), as well as the coexisting organic substances (sodium citrate, sodium acetate, trichloroacetic acid and aminoacetic acid) had a certain inhibitory effect on the removal of Cr(VI) by DTMPAM, while at the high DTMPAM dosage, the presence of these coexisting substances exhibited a little promotion for the removal of Cr(VI). The presence of inorganic cations, such as Fe3+, Ni2+ and Ba2+, had a significant inhibitory effect on the removal of Cr(VI) by DTMPAM, and Ba2+ had the most significant inhibitory effect among these ions. Infrared spectroscopy and energy spectrum analysis showed that the dithiocarboxyl groups on the molecular chain of DTMPAM could reduce Cr(VI) to Cr(III) in the water samples, and then Cr(III) could further chelated with the dithiocarboxyl groups and amine groups on the molecular chain of DTMPAM to form flocs.
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