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<p>The highly hazardous water pollutant Cr(VI) poses a significant risk to humans and other organisms. This paper uses polyacrylamide modified with dithiocarboxyl group (DTAPAM) as a heavy metal flocculant to remove Cr(VI) from water, which exhibits flocculation, chelating, and precipitation capabilities for Cr(VI). The performance of DTAPAM was evaluated by measuring its efficiency for removing Cr(VI). The results from the flocculation tests demonstrated that an acidic environment promoted the rapid removal for Cr(VI), achieving 99.60% of removal under pH 3.0. At a DTAPAM dosage of 360&#xa0;mg/L, Cr(VI) removal approached 100% under the tested conditions. Coexisting conventional inorganic cations and anions exhibited minor effects on the Cr(VI) removal. Additionally, organic complexing agents (sulfamic acid, trichloroacetic acid, aminoacetic acid, and citric acid) as well as turbidity exhibited inhibitory effects on Cr(VI) removal. Nevertheless, these effects were attenuated or largely offset with increasing dosage of DTAPAM. The mechanisms underlying the flocculation process involved redox reactions combined with chelating precipitation along with bridging and sweeping effects for removing Cr(VI). Overall, the dithiocarboxyl modification-based flocculant shows excellent performance in removing aqueous Cr(VI), providing valuable guidance for developing efficient flocculation techniques to remove Cr-containing wastewater.</p>

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Removal performance and mechanism of Cr(VI) by dithiocarboxyl-modified polyacrylamide as flocculant

  • 期刊论文

  • 发表日期：

    2026年7月16日

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  • Shengji Jiang,
  • Hang Zhang,
  • Gang Wang,
  • Lulu Wang,
  • Liang Dai

摘要

The highly hazardous water pollutant Cr(VI) poses a significant risk to humans and other organisms. This paper uses polyacrylamide modified with dithiocarboxyl group (DTAPAM) as a heavy metal flocculant to remove Cr(VI) from water, which exhibits flocculation, chelating, and precipitation capabilities for Cr(VI). The performance of DTAPAM was evaluated by measuring its efficiency for removing Cr(VI). The results from the flocculation tests demonstrated that an acidic environment promoted the rapid removal for Cr(VI), achieving 99.60% of removal under pH 3.0. At a DTAPAM dosage of 360 mg/L, Cr(VI) removal approached 100% under the tested conditions. Coexisting conventional inorganic cations and anions exhibited minor effects on the Cr(VI) removal. Additionally, organic complexing agents (sulfamic acid, trichloroacetic acid, aminoacetic acid, and citric acid) as well as turbidity exhibited inhibitory effects on Cr(VI) removal. Nevertheless, these effects were attenuated or largely offset with increasing dosage of DTAPAM. The mechanisms underlying the flocculation process involved redox reactions combined with chelating precipitation along with bridging and sweeping effects for removing Cr(VI). Overall, the dithiocarboxyl modification-based flocculant shows excellent performance in removing aqueous Cr(VI), providing valuable guidance for developing efficient flocculation techniques to remove Cr-containing wastewater.