Adsorption of Fluoride Ions in Water by Ca2+ and Mg2+ Modified TiO2

FENG Jiangtao; ZHANG Juantao; YAN Xuanye; FU Rao; ZHU Jinwei; YAN Wei

doi:10.7652/xjtuxb202211006

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Adsorption of Fluoride Ions in Water by Ca²⁺ and Mg²⁺ Modified TiO₂

更新时间：2025-07-09

- Adsorption of Fluoride Ions in Water by Ca²⁺ and Mg²⁺ Modified TiO₂
- Vol. 56, Issue 11, Pages: 49-61(2022)
- 作者机构：
  
  1. 西安交通大学能源与动力工程学院环境工程系,西安,710049
  2. 陕西电器研究所,西安,710025
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202211006
  CLC： X523
- Online First：10 November 2022，
  
  Published：2022
- 稿件说明：
移动端阅览
FENG Jiangtao, ZHANG Juantao, YAN Xuanye, et al. Adsorption of Fluoride Ions in Water by Ca²⁺ and Mg²⁺ Modified TiO₂[J]. 2022, 56(11): 49-61. DOI: 10.7652/xjtuxb202211006.
DOI：

FENG Jiangtao, ZHANG Juantao, YAN Xuanye, et al. Adsorption of Fluoride Ions in Water by Ca²⁺ and Mg²⁺ Modified TiO₂[J]. 2022, 56(11): 49-61. DOI: 10.7652/xjtuxb202211006. DOI：

摘要

为拓展TiO

吸附去除水中氟离子的pH适用范围

通过原位水解掺杂法制备出Ca

和Mg

改性的TiO

纳米颗粒材料TiO

-Ca和TiO

-Mg。场发射扫描电子显微镜(SEM)、X-射线衍射(XRD)、傅里叶变换红外光谱(FT-IR)、氮气吸脱附曲线、Zeta电位分析等表征显示

成功合成了改性的锐钛矿相TiO

并且TiO

-Ca和TiO

-Mg的等电点分别提高到了4.51和5.08。将合成的改性TiO

应用于水体低浓度氟离子的吸附去除

结果表明:TiO

-Ca和TiO

-Mg对水体氟离子的吸附可以在20 min内达到平衡

吸附容量分别达到22.51 mg·g

-1

和20.87 mg·g

-1

吸附的适用pH范围分别拓展到了5和6

其沉降性能也有了很大的提高

都较未改性的TiO

有了明显的改善。在常见的共存离子中

只有较高浓度的PO

和CO

才会明显影响其吸附性能

并且在反复脱附再生吸附20次循环后

TiO

-Ca和TiO

-Mg对水体中F

的吸附性能没有明显的降低。这说明

和Mg

改性对TiO

的物化性能和氟离子吸附性能都有明显的改善。此外

该吸附行为是自发的吸热过程

TiO

-Ca和TiO

-Mg对F

的去除主要涉及离子交换作用。该研究工作将为TiO

这种绿色材料应用于水体低浓度氟离子的去除提供理论与技术支持。

Abstract

This paper investigates the applicable pH value ranges for TiO

to remove

from water. First

TiO

-Ca and TiO

-Mg nanoparticles modified by Ca

and Mg

are successfully gained by in-situ hydrolysis and doping. Then field emission scanning electron microscopy(FESEM)

X-ray diffraction(XRD)

Fourier transform infrared spectroscopy(FT-IR)

adsorption-desorption analysis and Zeta potential analysis are carried out for characterization. The results show that the modified anatase phase TiO

was successfully synthesized

and that the isoelectric points of TiO

-Ca and TiO

-Mg were increased to 4.51 and 5.08 respectively. The modified TiO

samples were applied to remove the low-concentration fluoride ions from water. The results show that the adsorption of fluoride ions by TiO

-Ca and TiO

-Mg can reach equilibrium within 20 min

with the adsorption capacity reaching 22.51 mg·g

-1

and 20.87 mg·g

-1

respectively. Compared with the raw TiO

the applicable pH value ranges of TiO

-Ca and TiO

-Mg are expanded to 5 and 6 respectively

and their sedimentation performance is greatly improved. Among the common coexisting ions

only high-concentrations PO

and CO

can significantly affect their adsorption performance. After the desorption and regeneration cycle was repeated 20 times

the adsorption of F

in water by TiO

-Ca and TiO

-Mg did not decrease significantly. This shows that modification by Ca

and Mg

has obvious effects on the physicochemical properties and fluorine ion adsorption of TiO

samples. In addition

the adsorption is a spontaneous exothermic process and the removal of F

by TiO

-Ca and TiO

-Mg mainly involves ion exchange. The research results will provide theoretical and technical support for the application of the environmental-friendly TiO

in the removal of low-concentration fluoride ions from water.

关键词

Keywords

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