聚多巴胺改性海泡石对有机染料的吸附性能研究
Adsorption Properties of Polydopamine Modified Sepiolite for Organic Dyes
鲜雯 1熊惠明 1黄阳 1罗立涛 1李椹 1苏妮1
作者信息
- 1. 西南科技大学环境与资源学院;固体废物处理与资源化教育部重点实验室;非金属矿粉体改性与高质化利用工程实验室
- 折叠
摘要
经过多巴胺自聚合反应制备了聚多巴胺改性海泡石复合材料(PDA@SEP),用X射线衍射仪(XRD)、傅里叶变换红外光谱仪(FT-IR)、比表面积及孔径分布测定仪等手段对该复合材料进行了表征,并重点研究了其对阳离子型有机染料结晶紫(CV)、孔雀石绿(MG)、亚甲基蓝(MB)和罗丹明B(RhB)的吸附性能和可再生性.结果表明,经聚多巴胺改性的海泡石对CV、MG、MB、RhB的最大吸附容量分别为1 501.1,555.1,120.9,149.3 mg/g,均高于未改性的海泡石;PDA@SEP对有机染料吸附过程符合准二级动力学模型和Langmuir等温线.0.1 mol/L盐酸作为洗脱剂的吸附—解吸试验发现,5次循环使用的PDA@SEP对有机染料的去除率仍然保持在40%以上,表明该复合材料具有良好的可重复使用性.综合上述,PDA@SEP是一种潜力较大的去除废水中有机染料的环境矿物材料.
Abstract
Polydopamine-modified sepiolite composite(PDA@SEP)was prepared by dopamine self-polymerization.The composite was characterized by X-ray diffractometer(XRD),Fourier transform infra-red spectrometer(FT-IR),specific surface area and aperture distribution measuring instrument.The adsorp-tion properties and renewability of cationic organic dyes Crystal Violet(CV),Malachite Green(MG),Methylene Blue(MB)and Rhodamine B(RhB)were studied.The results showed that the maximum adsorp-tion capacities of polydopamine modified sepiolite for CV,MG,MB and RhB were 1 501.1,555.1,120.9 and 149.3 mg/g,respectively,which were higher than those of unmodified sepiolite.The adsorption process follows to the pseudo-second-order kinetic model and Langmuir isotherm.The adsorption and desorption test of 0.1 mol/L hydrochloric acid as eluent showed that the removal rate of organic dyes by PDA@SEP used for 5 cycles remained above 40%,indicating that the composite had good reusability.In summary,PDA@SEP is an environmental mineral material with great potential for removing organic dyes from wastewater.
关键词
海泡石/多巴胺/有机染料/吸附Key words
sepiolite/dopamine/organic dyes/adsorption引用本文复制引用
基金项目
大学生创新创业训练计划项目(21XCY033)
出版年
2024
NETL
NSTL
万方数据