In this work, the novel β-cyclodextrin based polymeric flocculants (CADs) were synthesized and applied on the treatment of humic acid (HA)-kaolin wastewater. Acrylamide (AM) and acryloyloxyethyltrimethyl ammonium chloride (DAC) were grafted onto β-cyclodextrin (β-CD) by ultrasound assisted initiation using ceric ammonium nitrate as initiator. The synthesized conditions were optimized by evaluating the intrinsic viscosity and grafting efficiency of CADs. Furthermore, the characterization methods including Fourier transform infrared spectroscopy (FTIR), ¹H nuclear magnetic resonance spectroscopy (¹H NMR), thermogravimetric/differential scanning calorimetry (TG/DSC) and scanning electron microscopy (SEM) were used to evaluate and analyze the molecular structure and surface morphology of graft copolymers. In flocculation experiments, the effects of dosage, flocculant types, solution pH and flocs properties on flocculation performance were investigate in detail. CADs exhibited more satisfactory turbidity and HA removal performance than the synthetic cationic flocculants (PAD) and the non-ionic graft polymers (CAM). At the optimum dosage 4 mg/L, the maximum turbidity and HA removal rate of CAD 1# was 97.5% and 68.3%, respectively. Furthermore, CAD 1# exhibited a good flocculation performance and wide flocculation window in the pH range of 2.0–8.0. Lastly, the flocculation mechanism of CAD was detailed discussed by the investigation of zeta potential, surface tension, flocs FTIR and XPS spectra. Results indicated the unique hydrophobic internal structure of β-CD played an important role in improving the removal rate HA of CAD.

在这项工作中，合成了新型的基于β-环糊精的高分子絮凝剂（CAD），并将其用于处理腐殖酸（HA）-高岭土废水。以硝酸铈铵为引发剂，通过超声辅助引发将丙烯酰胺（AM）和丙烯酰氧基乙基三甲基氯化铵（DAC）接枝到β-环糊精（β-CD）上。通过评估CAD的特性粘度和接枝效率来优化合成条件。此外，表征方法包括傅立叶变换红外光谱（FTIR），¹ H核磁共振光谱（¹用1 H NMR，热重/差示扫描量热法（TG / DSC）和扫描电子显微镜（SEM）评估和分析接枝共聚物的分子结构和表面形态。在絮凝实验中，详细研究了用量，絮凝剂类型，溶液的pH值和絮凝特性对絮凝性能的影响。与合成阳离子絮凝剂（PAD）和非离子接枝聚合物（CAM）相比，CAD表现出更令人满意的浊度和HA去除性能。在最佳剂量4 mg / L时，CAD 1＃的最大浊度和HA去除率分别为97.5％和68.3％。此外，CAD 1＃在2.0-8.0的pH范围内具有良好的絮凝性能和宽的絮凝窗口。最后，通过研究Zeta电位，表面张力，絮凝FTIR和XPS光谱详细讨论了CAD的絮凝机理。结果表明，β-CD独特的疏水内部结构在提高CAD去除率HA中起着重要作用。