College of Chemistry and Chemical Engineering, Qingdao University, Qingdao 26607, China.
College of Chemistry and Chemical Engineering, Qingdao University, Qingdao 26607, China; Institute of Polymer Science, Qingdao University, Qingdao 26607, China.
Int J Biol Macromol. 2020 Aug 1;156:585-590. doi: 10.1016/j.ijbiomac.2020.04.054. Epub 2020 Apr 17.
Flocculant made from natural polymers has the advantages of abundant source, affordable cost and environmental friendliness. In this work, a binary flocculant (sodium alginate-dimethyl diallyl ammonium chloride, SAD) was successfully prepared using microwave assisted free radical copolymerization technique. Based on the flocculation properties of yellow 7GL dye, the synthetic process was optimized with the amount of initiator was 0.8 wt% (equal molar ratio of ammonium peroxydisulfate and sodium bisulfite as complex initiator), sodium alginate: dimethyl diallyl ammonium chloride = 1:1 (molar ratio), and the microwave irradiation time was 18 min at the power of 280 W. The experimental results show that the color removal ratio was 73.5% at the SAD dosage of 425 mg/L for the 100 mg/L yellow 7GL simulated wastewater. The SAD also maintained excellent decolorization ratios under a wide range of flocculant dosage and environmental pH. The flocculation mechanism might be the combination of charge neutralization and bridging effect. The prepared SAD flocculant has the virtues of simple synthesis process, ecofriendliness and high decolorization ratio, which make it broad application prospect in the treatment of dye wastewater.
由天然聚合物制成的絮凝剂具有来源丰富、成本低廉和环境友好的优点。在这项工作中，使用微波辅助自由基共聚技术成功制备了二元絮凝剂（海藻酸钠-二甲基二烯丙基氯化铵，SAD）。基于黄色 7GL 染料的絮凝性能，通过优化引发剂用量为 0.8wt%（过硫酸铵和亚硫酸氢钠的等摩尔比作为复合引发剂）、海藻酸钠：二甲基二烯丙基氯化铵=1:1（摩尔比）和微波辐照时间为 18 分钟（功率为 280W），优化了合成工艺。实验结果表明，在 100mg/L 黄色 7GL 模拟废水中，SAD 用量为 425mg/L 时，去除率为 73.5%。SAD 在较宽的絮凝剂用量和环境 pH 值范围内也保持了优异的脱色率。絮凝机理可能是电荷中和和桥联作用的结合。所制备的 SAD 絮凝剂具有合成工艺简单、环保和高脱色率的优点，使其在处理染料废水方面具有广阔的应用前景。
