张永祥,李雅君,井琦,王晋昊,郭汶俊.F-127改性纳米零价铁及对水中2,4-DCP的去除[J].环境科学学报,2019,39(8):2559-2566
F-127改性纳米零价铁及对水中2,4-DCP的去除
- Modified nano zero-valent iron by F-127 and its application in removal of 2,4-dichlorophenol in water
- 基金项目：北京市科委项目（No.Z161100004516015）；国家重点研发计划（No.2016YFC0401404）
- 张永祥
- 北京工业大学建筑工程学院, 水质科学与水环境恢复工程北京市重点实验室, 北京 100124
- 李雅君
- 北京工业大学建筑工程学院, 水质科学与水环境恢复工程北京市重点实验室, 北京 100124
- 井琦
- 北京工业大学建筑工程学院, 水质科学与水环境恢复工程北京市重点实验室, 北京 100124
- 王晋昊
- 北京工业大学建筑工程学院, 水质科学与水环境恢复工程北京市重点实验室, 北京 100124
- 郭汶俊
- 北京工业大学建筑工程学院, 水质科学与水环境恢复工程北京市重点实验室, 北京 100124
- 摘要：为了增强纳米零价铁的分散性，本研究采用环境友好型材料Pluronic F-127对纳米零价铁（NZVI）进行表面改性，形成分散型纳米零价铁（F-NZVI），并用于水中2，4-DCP的去除.通过不同质量比的F-NZVI颗粒沉降试验和对2，4-DCP的去除试验，发现存在沉降去除和悬浮去除两个阶段，确定F-127与NZVI颗粒的最佳质量比为2∶1，2，4-DCP最大去除率为72.32%.通过SEM、FTIR、XRD、XPS对样品进行表面形貌、组成和晶体结构分析，发现F-127对提高NZVI分散性和抗氧化性有显著作用.通过控制不同因素研究F-NZVI去除水中2，4-DCP的最优条件，实验结果表明，当2，4-DCP初始浓度为20 mg·L-1时，F-NZVI去除2，4-DCP的最佳pH值为5，F-NZVI最佳投加量为3 g·L-1.
- Abstract：To enhance the dispersivity of nano zero-valent iron (NZVI) used for removing 2,4-DCP from water, the surfaces of NZVI was modified with F-127 as an environmentally friendly organic stabilizer. Based on different mass ratio of F-NZVI particles sedimentation experiment and 2,4-DCP removal experiment,two-stage process (sedimentation removal and suspension removal) was found. The optimum mass ratio of F-127 to NZVI particles was found to be 2:1 and the maximum removal efficiency was 72.32%. The surface morphology, composition and crystal structure of the samples were analysed by using scanning electron microscope (SEM), Fourier Transform Infrared Spectroscopy (FTIR), X-Ray Diffraction (XRD) and X-ray photoelectron spectroscopy (XPS), respectively. Results show that F-127 significantly improved NZVI dispersibility and oxidation resistance. Final,the main factors of F-NZVI for the removal 2,4-DCP in water were studied to find the optimal 2,4-DCP removal condition, which were pH=5, 3 g·L-1 F-NZVI for 20 mg·L-1 of 2,4-DCP.
