共 49 条
Removal of Cd2+ from water containing Ca2+ and Mg2+ using titanate nanotubes modified by carbon
被引:3
作者:
Wu, Mingda
[1
]
Lu, Linghong
[1
]
Zhou, Tao
[1
]
Ma, Yi
[1
]
Weng, Zhengsong
[1
]
机构:
[1] Nanjing Tech Univ, Coll Chem Engn, State Key Lab Mat Oriented Chem Engn, Nanjing 211816, Peoples R China
基金:
中国国家自然科学基金;
关键词:
Water treatment;
Cadmium ion;
Titanate nanotubes;
Carbon modification;
ACTIVATED CARBON;
ADSORPTION;
EFFICIENT;
CD(II);
IONS;
NANOMATERIALS;
DEGRADATION;
MECHANISM;
PB(II);
ACID;
D O I:
10.1007/s11356-022-19002-7
中图分类号:
X [环境科学、安全科学];
学科分类号:
08 ;
0830 ;
摘要:
Calcium and magnesium ions usually exist in natural water. When Cd2+ is removed from water by adsorption, it will be inhibited by these two ions. Titanate nanotubes (TNTs) have an effective adsorption capacity for Cd2+ due to extraordinary ion exchange property. However, TNTs also adsorb Ca2+ and Mg2+ in water. In this study, carbon-modified TNT (TNT/C) and TNT/C further treated with acid (TNT/HC) were synthesized by hydrothermal synthesis. The transmission electron microscope (TEM) images show that TNT/C or TNT/HC still keep nanotube morphology. The experimental results show the order of adsorption amount to Cd2+ is TNT (171.56 mg/g) > TNT/C (166 mg/g) > TNT/HC (159.88 mg/g) when there is no Ca2+ or Mg2+. But when there is 0.1 M Ca2+ or Mg2+ in the water, the order of Cd2+ adsorption capacity becomes TNT/HC (44.28, 49.04 mg/g) > TNT/C (58.84, 69.32 mg/g) > TNT (65.52, 70.6 mg/g). It indicates that the surface carbon modification can alleviate the hindrance of Ca2+ or Mg2+ to Cd2+ removal. This is because the carbon on the surface of TNT captured part of Ca2+ or Mg2+; it made more Cd2+ be successfully absorbed by TNT through ion exchange. This mechanism was confirmed by the X-ray photoelectron spectroscopy (XPS) spectra analysis. The results of this paper can provide ideas for the adsorption and removal of Cd2+ in water in the presence of Ca2+ or Mg2+.
引用
收藏
页码:44794 / 44805
页数:12
相关论文