Journal
POLYMERS FOR ADVANCED TECHNOLOGIES
Volume 32, Issue 2, Pages 842-852Publisher
WILEY
DOI: 10.1002/pat.5135
Keywords
flocculants; metal removal; polyacrylamide; polyhydroxamic acid; wastewater treatment
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Funding
- Israel Science Foundation [235/17]
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Hydroxamic acid-containing organic polymeric flocculants were synthesized from three different commercially available polymeric flocculants and showed improved chelation with Fe3+ and Cu2+. The conversion of the amide groups to hydroxamic acid groups in the polymers enhanced their flocculation effect on tested wastewater.
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 Fe(3+)and Cu2+. In addition, the modified polymers display improved flocculation effect on tested wastewater.
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