以糠醛废水为助剂制备的纳米钛酸镁对铅、镉、镍的吸附性能
Adsorption Properties of Nano-Magnesium Titanate Prepared with Furfural Wastewater for Lead,Cadmium and Nickel
张经铭 1赵苗 1张东 1姜承志 1徐文迪1
作者信息
- 1. 沈阳理工大学 环境与化学工程学院,沈阳 110159
- 折叠
摘要
以糠醛废水、氧化镁和钛酸四丁酯为原料,采用溶胶-凝胶法制备纳米钛酸镁粉体,利用X射线衍射仪、扫描电镜和红外光谱仪对其进行表征,并研究其对铅、镉、镍离子的吸附性能.以镉离子为例,对吸附过程的热力学和动力学进行了探讨.结果表明:纳米钛酸镁粉体在pH为4～8 的介质中,对水中的铅、镉和镍离子具有较强的吸附能力;吸附行为符合Langmuir等温方程和准二级动力学模型;吸附的重金属离子可用5 mL、浓度为0.5 mol/L硝酸溶液完全洗脱回收,富集因子高达50.将本文方法用于固相萃取富集-火焰原子吸收测定水样中铅、镉和镍离子,效果较好.
Abstract
In this paper,nanomagnesium titanate powders were prepared by sol-gel method using furfural wastewater,magnesium oxide and tetrabutyl titanate as raw materials.The powders were characterized by X-ray diffraction,scanning electron microscopy and fourier transform infrared spectroscopy.The adsorption properties of the powder to heavy metal ions such as lead,cadmium and nickel were explored.Taking cadmium ion for instance,the thermodynamics and kinetics of the adsorption process were studied.The results indicate that magnesium titanate gel precursor can be produced and nanomagnesium titanate powders are prepared after calcination by neutralizing with magnesium oxide,evaporating and concentrating furfural wastewater,and then adding tetrabutyl ti-tanate.The material has strong adsorption capacity for lead,cadmium and nickel in water in the me-dium of pH 4～8.As an endothermic spontaneous physical process,the adsorption behavior is ac-cord with Langmuir isotherm and quasi-second-order kinetic model.The heavy metals adsorbed can be thoroughly eluted and recovered by 5 mL,0.5 mol/L nitric acid solutions.The concentration factor of lead,cadmium and nickel is as high as 50.The application of this method in the determina-tion of trace lead,cadmium and nickel ions can be manifested in water samples by solid phase ex-traction enrichment and flame atomic absorption with satisfactory results.
关键词
糠醛废水/纳米钛酸镁/重金属/吸附行为/富集Key words
furfural wastewater/nanomagnesium titanate/heavy metals/adsorption behavior/en-richment引用本文复制引用
基金项目
辽宁省教育厅高等学校基本科研项目(LJKMZ20220599)
沈阳市科技计划项目(22322315)
出版年
2024
NETL
NSTL
维普
万方数据