MXene@CS复合絮凝剂的制备及其对刚果红去除的研究

Synthesis of MXene@CS composite flocculant and its application in removal of Congo red dye from aqueous solution

壳聚糖(CS)因具有大量的羟基和氨基,可为吸附色素污染物提供较多活性位点,但其在酸性条件易于溶解。MXene可为CS提供支撑位点,从而构建新型MXene@CS复合材料。研究构建了新型Ti3C2TX@CS有机无机复合材料,并应用于刚果红的去除研究。通过对Ti3C2TX@CS的微观形貌、晶体结构、表面官能团等进行表征分析,发现Ti3C2TX@CS的复合过程为物理复合。絮凝实验结果表明:在Ti3C2TX@CS投加量为30 mg、溶液pH为9、反应时间为30 min、温度为25~60℃条件下,Ti3C2TX@CS对50 mL质量浓度为500 mg/L刚果红(CR)溶液的脱色率达到99%以上。通过实验结果和反应前后Ti3C2TX@CS电位变化推断,Ti3C2TX@CS对刚果红的去除机理主要是电中和作用和吸附架桥作用。

Chitosan(CS)has a large number of hydroxyl and amino groups,which can provide more active sites for adsorption of pigment pollutants,but it was easy to dissolve in acidic conditions.MXene could provide support sites for CS,thereby constructing a new type of MXene@CS composite material.A new type of Ti3C2TX@CS organic-inorganic composite was synthesized and applied in the removal of Congo red(CR).The Ti3C2TX@CS composite was proven to be physically compounded through the micromorphology,crystal structure and surface functional group analysis data.The experimental results showed that the decolorization rate of CR solution(500 mg/L)by synthesized Ti3C2TX@CS could exceed 99%at Ti3C2TX@CS dose of 30 mg,pH of 9,and reaction time of 30 min and the temperature range at 25~60℃.The experimental results and the change of Ti3C2TX@CS potential before and after the reaction were used to infer the Ti3C2TX@CS to Congo red.The removal mechaanism is the action of electrical neutralization and adsorption bridging.