Abstract: A macromolecule heavy metal flocculant, named polydithiocarboxyl acrylamide (PDTAM), was used to treat the sample of simulated wastewater containing Cr(Ⅵ) prepared in the laboratory. The removal performance and environmental disturbance resistance of PDTAM for Cr(Ⅵ) were investigated. The optimal flocculation conditions for Cr(Ⅵ) removal with PDTAM from water sample were determined through some parameters, such as the dosage of PDTAM, hydraulic conditions of flocculation, and initial pH value. Common inorganic substances, organic compounds, and turbidity were studied as environmental interference factors in actual Cr(Ⅵ)-containing wastewater. The experimental results show that the highest Cr(Ⅵ) removal rate was 97.51% under rapid stirring (120 r/min) for 1.5 min, slow stirring (40 r/min) for 15 min, pH 3.0, and PDTAM dosage of 540 mg/L. At low PDTAM dosages, coexisting substances had a strong inhibition on Cr(Ⅵ) removal, but the influence would be weakened or eliminated by increasing the dosage of PDTAM, except for IO3-, BrO3-, Ba2+ and Ni2+, which still exhibited a strong inhibition on Cr(Ⅵ) removal. Infrared spectroscopy, scanning electron microscopy and energy spectrum analysis revealed that the removal mechanism of PDTAM for Cr(Ⅵ) mainly involved oxidation and reduction, chelation precipitation, and flocculation sedimentation mainly by adsorption bridging.
杨晓敏, 王刚, 王雪, 桑芳娟, 杨凯. 高分子絮凝剂PDTAM去除水中Cr(Ⅵ)的抗环境干扰性研究[J]. 材料导报, 2025, 39(7): 23100140-8.
YANG Xiaomin, WANG Gang, WANG Xue, SANG Fangjuan, YANG Kai. Resistance to Environmental Disturbance of Macromolecule Flocculant PDTAM in Cr(Ⅵ) Removal from Water Samples. Materials Reports, 2025, 39(7): 23100140-8.
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2025, Vol. 39 
