Preparation of Sweet-potato Starch Microspheres and Its Application to the Removal of Cu2+ in Wastewater
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摘要: 以红薯粉为原料、Span 60与Tween 60为乳化剂、N,N-亚甲基双丙烯酰胺(MBAA)为交联剂,采用反相乳化交联法制备淀粉微球,用红外光谱仪(FT-IR)、扫描电镜(SEM)及比表面积和孔径分析仪对其进行表征和分析,并对模拟Cu2+污水进行吸附测试,探寻最佳吸附条件,并将最优吸附条件应用于西安汉城湖水样的Cu2+吸附测试。研究发现,制备的红薯淀粉微球的结构良好,且当淀粉微球投入浓度为0.12 g·m L-1、吸附时间为45 min时,吸附效果最佳;汉城湖水样测试显示,Cu2+去除率达到82.45%。Abstract: Starch microspheres were prepared by inverse cross linking-emulsion method with sweet potato starch as raw material, Span 60 and tween-60 as emulsifiers, and N, N-methylene bisacrylamide (MBAA) as crosslinking agent. Their functional groups were characterized by Fourier transform infrared spectroscopy (FT-IR), the morphologies of starch microspheres were observed by the scanning electron microscopy (SEM), and their specific surface areas and pore sizes were also tested. The optimum condition for the removal of Cu2+were investigated by simulation wastewater.Results showed that the structure of sweetpotato starch microsphere was fit to adsorb Cu2+and when the mass concentration of microphere was 0.12 g·mL-1, and the adsorption time was 45 min, the adsorption effect was the best. The adsorption test of Cu2+in Xi'an Seoul lake water was carried out under the optimum condition, and the removal rate reached to 82.45%.
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Key words:
- starch microspheres /
- cross-linking preparation /
- adsorption of Cu2+
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