Fabrication of a cationic polysaccharide for high performance flocculation
Fabrication of a cationic polysaccharide for high performance flocculation
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用于高性能絮凝的阳离子多糖的制备
DOI：
10.1016/j.colsurfa.2017.02.078
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发表时间：
2017-05
期刊：
影响因子：
--
通讯作者：
Zhang Qiqing
中科院分区：
文献类型：
--
作者：
You Lijun;Song Lidao;Wang Ao;Lu Feifei;Zhang Qiqing
以葡聚糖和壳聚糖为原料，采用交联法合成了一种阳离子多糖（CDCS）。采用热重分析和红外光谱对絮凝剂进行了表征。考察了温度、pH值和絮凝剂投加量对絮凝效果的影响。CDCS在较宽的pH范围内具有较高的絮凝性能。在高岭土悬浮液中，当pH为3-7时，投加量在5 mg/L以下时，絮凝率可达96.9%以上。在碱性条件下，当投加量为7和17 mg/L时，絮凝率分别为98.2%（pH = 9）和93.7%（pH = 11）。温度从10 ℃升高到40 ℃时，絮凝效率下降。在实际废水处理中，CDCS絮凝剂的处理效果明显优于商品聚丙烯酰胺和硫酸铁。对废水中固体悬浮物的去除率达97.7%。絮凝剂作用机理研究表明，絮凝过程包括电中和、吸附架桥和絮凝剂清扫作用机理。CDCS絮凝剂在废水处理中具有广阔的应用前景。
A cationic polysaccharide (CDCS) derived from dextran and chitosan was fabricated by crosslinking method as an eco-friendly flocculant. The flocculant was characterized by thermogravimetric analysis and Fourier transform infrared spectroscopy. Influences of temperature, pH and flocculant dosage on flocculation efficiency were examined. The CDCS presented enhanced high flocculation properties in a wide pH range conditions. In kaolin suspension, when pH was in the rang of 3–7, the flocculation efficiency was over 96.9% with dosage below 5 mg/L. In alkaline condition, it also presented a high flocculation efficiency of 98.2% (pH = 9) and 93.7% (pH = 11) with a low dosage of 7 and 17 mg/L, respectively. The flocculation efficiency decreased as the temperature rose from 10 to 40∘C. For actual wastewater treatment, the CDCS flocculant performed much better than commercial polyacrylamide and ferric sulfate. It removed 97.7% of the solid suspended particles in the wastewater. The flocculant mechanism study suggested charge neutralization, adsorption bridging and sweeping flocculant mechanisms were included in the flocculation process. The flocculant CDCS exhibited a broad prospects for wastewater treatment.
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