以木薯淀粉为原料,在微波和超声波双外场的作用下采用沉淀法制备淀粉纳米颗粒(starch nanoparticles, SNPs)。通过动态光散射仪(dynamic light scattering, DLS)、场发射扫描电镜(scanning electronic microscope, SEM)、原子力显微镜(atomic force microscope, AFM)、比表面积分析仪(Brunner-Emmet-Teller, BET)对SNPs进行表征,考察了SNPs对番红花红T的吸附机理,进一步考察了时间、吸附剂的投加量、粒径对吸附的影响。结果表明:SNPs具有较好的球形形貌,是V型淀粉晶体结构,Zeta电位值为-23.7 mV,比表面积大大增加。在番红花红T的质量浓度为200 mg/L,吸附时间为60 min,温度为298.15 K的条件下,投加20 mg平均粒径为40 nm的SNPs,吸附量可达115 mg/g。SNPs对番红花红T的吸附过程符合准二级动力学模型和Langmuir等温吸附模型。
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