聚乙烯亚胺功能化磁性纳米颗粒制备及其吸附分离蒽醌类阴离子染料性能研究

发布时间：2018-01-02 23:14

本文关键词：聚乙烯亚胺功能化磁性纳米颗粒制备及其吸附分离蒽醌类阴离子染料性能研究　出处：《分析化学》2016年02期 　论文类型：期刊论文

【摘要】：在室温下,采用戊二醛化学交联法制备聚乙烯亚胺功能化的磁性纳米吸附剂(Fe_3O_4-PEI)。利用TEM、XRD、FT-IR、VSM和TGA等手段对其进行结构表征,并以茜素红、核固红及茜素绿3种蒽醌类染料为目标吸附质,通过静态吸附实验考察了p H值、吸附时间、染料初始浓度、操作温度等因素对吸附的影响,同时进行了吸附动力学和吸附等温线模拟研究。结果表明,在p H=3和温度303 K的条件下,茜素红、核固红和茜素绿的最大吸附量分别为256.1,138.8和134.6 mg/g;初始浓度和吸附时间对染料吸附效率有明显的影响,吸附可在60 min内达到平衡,且吸附过程符合准二级动力学模型;Langmuir等温线模型能更好地描述染料的吸附;蒽醌类染料在Fe_3O_4-PEI上的吸附是一个自发的吸热过程。另外,Fe_3O_4-PEI良好的稳定性和重复使用性,使其可作为一种潜在的水处理吸附剂。
[Abstract]:At room temperature, polyethyleneimide functionalized magnetic nano-adsorbent, Fe3O4-PEI, was prepared by chemical crosslinking of glutaraldehyde. The structure was characterized by VSM and TGA. The adsorption time and pH value of anthraquinone dyes such as alizarin red, nuclear solid red and alizarin green were investigated by static adsorption experiments. The effects of initial dye concentration and operating temperature on the adsorption were studied. The adsorption kinetics and adsorption isotherm were simulated. The results showed that alizarin red was obtained at pH _ (3) and temperature (303 K). The maximum adsorptive capacity of nuclear solid red and alizarin green were 256.1 mg / g and 134.6 mg / g, respectively. The initial concentration and adsorption time have obvious effects on the adsorption efficiency of dyes. The adsorption can reach equilibrium within 60 min, and the adsorption process accords with the quasi-second-order kinetic model. The Langmuir isotherm model can better describe the adsorption of dyes. The adsorption of anthraquinone dyes on Fe_3O_4-PEI is a spontaneous endothermic process. In addition, Fe3O4-PEI has good stability and reusability. It can be used as a potential water treatment adsorbent.
【作者单位】：昆明理工大学环境科学与工程学院;
【基金】：国家自然科学基金(No.21307048) 云南省应用基础研究计划(No.2013FB011)资助项目~~
【分类号】：X703;O647.3
【正文快照】： 1引言合成有机染料作为一种重要的工业产品,广泛应用于纺织、造纸、电镀、印刷、食品加工和化妆品等行业[1,2]。蒽醌类染料是用量仅次于偶氮染料的一类活性染料[3,4],大多具有复杂且稳定的化学结构,在环境中常难以生物降解,对人类健康和生态环境存在着极大的威胁[5,6]。因此,

【参考文献】