Hydroxamic acid containing organic polymeric flocculants were synthesized from three different commercially available polymeric flocculants, such as WAS590, Zetag 4100, and Zetag 4110. These three polymers are acrylamide and acrylic acid‐based copolymers with different molecular weights and anionic charge density. The conversion of the amide groups to hydroxamic acid groups in the polymers was carried out by the reaction with hydroxylamine at pH 14. The modified polymers were characterized for structure and composition by elemental analysis, FTIR, and NMR. The chelation activity of the modified polymers was determined toward iron (Fe³⁺) and copper (Cu²⁺). The flocculation activity of the non‐modified and modified polymers was evaluated toward produced water and scrubber water. The results showed that all the modified flocculants exhibit better chelation with Fe³⁺ and Cu²⁺. In addition, the modified polymers display improved flocculation effect on tested wastewater.

中文翻译：

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聚异羟肟酸作为一种有效的金属螯合剂和絮凝剂，用于废水处理

含异羟肟酸的有机高分子絮凝剂是由三种不同的市售高分子絮凝剂（例如WAS590，Zetag 4100和Zetag 4110）合成的。这三种聚合物是具有不同分子量和阴离子电荷密度的丙烯酰胺和丙烯酸共聚物。聚合物中酰胺基团向异羟肟酸基团的转化是通过与羟胺在pH 14下反应进行的。通过元素分析，FTIR和NMR对改性聚合物的结构和组成进行了表征。确定了改性聚合物对铁（Fe ³⁺）和铜（Cu ²⁺）。评估了未改性和改性聚合物对采出水和洗涤塔水的絮凝活性。结果表明，所有改性絮凝剂均与Fe ³⁺和Cu ²⁺具有较好的螯合性。此外，改性聚合物对测试废水显示出改善的絮凝效果。