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Dye wastewater causes great harm to the natural environment and health. To prepare a high-efficient and cost-effective flocculant to deal with the cationic dye wastewater is still an enormous challenge. In this paper, an anionic copolymer of lignocellulose, acrylamide and carboxymethyl cellulose (LAC) was designed and synthesized by microwave-assisted copolymerization technique. The synthetic parameters of monomer ratio, amount of initiator and irradiation time were optimized as 1:1:2, 1.0% (w/w), and 16 min, respectively, according to the flocculation efficiency towards cationic dye of methylene blue. When the dye concentration was 400 mg/L and the dosage of LAC was 21 mg, the optimum color removal ratio can reach 92.0 ± 2.2%. LAC displayed superior flocculation performance in a wide range of flocculant dosage and wastewater pH. The flocculation mechanism mainly involves electric neutralization and bridging. In addition, the treatment cost of LAC is 32% lower than that of commercial anionic PAM, offering excellent flocculation performance and cost-effectiveness. The LAC flocculant has the advantages of wide source of raw materials, low price, simple synthesis process and good flocculation performance, which has great use potential in the field of wastewater treatment.Graphical abstract[graphic not available: see fulltext]
Iranian Polymer Journal – Springer Journals
Published: May 1, 2022
Keywords: Lignocellulose; Acrylamide; Carboxymethyl cellulose; Flocculant; Microwave
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