高分子絮凝剂PDTAM去除水中Cr(Ⅵ)的抗环境干扰性研究  

Resistance to Environmental Disturbance of Macromolecule Flocculant PDTAM in Cr(Ⅵ) Removal from Water Samples

作　　者：杨晓敏 王刚[1] 王雪 桑芳娟 杨凯 YANG Xiaomin;WANG Gang;WANG Xue;SANG Fangjuan;YANG Kai(School of Environmental and Municipal Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]兰州交通大学环境与市政工程学院,兰州730070

出　　处：《材料导报》2025年第7期223-230,共8页Materials Reports

基　　金：国家自然科学基金(51368030)。

摘　　要：探究高分子重金属絮凝剂聚二硫代羧基化丙烯酰胺(PDTAM)去除Cr(Ⅵ)的性能,以实验室配制的含Cr(Ⅵ)模拟废水样为考察对象,通过PDTAM投加量、絮凝水力条件和初始pH值等确定了PDTAM去除废水中Cr(Ⅵ)的最佳絮凝条件;参考实际含Cr(Ⅵ)废水中常见的无机物质、有机物质和浊度作为环境干扰因素,研究了其对PDTAM处理含Cr(Ⅵ)废水的影响。结果表明,当水样初始pH值为3.0时,在最佳絮凝水力条件为120 r/min快搅1.5 min、40 r/min慢搅15 min下投加540 mg/L的PDTAM,Cr(Ⅵ)的最高去除率可达97.51%。在PDTAM低投加量下共存物质对去除Cr(Ⅵ)皆存在较强的抑制作用,该抑制作用可通过增加PDTAM的投加量来减弱或消除;但是共存离子IO_(3)~-、BrO_(3)~-、Ba^(2+)和Ni^(2+)对PDTAM去除Cr(Ⅵ)仍存在较强的抑制作用。红外光谱、扫描电镜和能谱分析揭示了PDTAM对Cr(Ⅵ)的去除机理主要有氧化还原、螯合沉淀和以吸附架桥为主的絮凝沉降等作用。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 IO_(3)^(-),BrO_(3)^(-),Ba^(2+)and Ni^(2+),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.

关 键 词：高分子絮凝剂 含Cr(Ⅵ)废水 共存物质 絮凝 氧化还原 

分 类 号：TB34[一般工业技术—材料科学与工程] X703[环境科学与工程—环境工程] TQ085[化学工程]