A comparative study on adsorption behavior of iodinated X-ray contrast media iohexol and amidotrizoic acid by magnetic-activated carbon

被引:8
作者
Cheng, Xinying [1 ]
Ji, Qiuyi [1 ]
Sun, Dunyu [1 ]
Zhang, Jinghua [1 ]
Chen, Xianxian [1 ]
He, Huan [1 ,2 ]
Li, Shiyin [1 ]
Yang, Shaogui [1 ]
Zhang, Limin [1 ,3 ]
机构
[1] Nanjing Normal Univ, Sch Environm, Nanjing 210023, Jiangsu, Peoples R China
[2] Wuyi Univ, Coll Ecol & Resource Engn, Fujian Prov Key Lab Ecoind Green Technol, Wuyishan 354300, Fujian, Peoples R China
[3] Nanjing Univ Finance & Econ, Green Econ Dev Inst, Nanjing 210023, Jiangsu, Peoples R China
基金
中国国家自然科学基金;
关键词
Magnetic activated carbon; Iohexol; Amidotrizoic acid; Density functional theory; Co-adsorption; Adsorption mechanism; TANDEM MASS-SPECTROMETRY; WASTE-WATER; LIQUID-CHROMATOGRAPHY; AQUEOUS-SOLUTION; REMOVAL; DEGRADATION; DIATRIZOATE; PERFORMANCE; ADSORBENT; SORPTION;
D O I
10.1007/s11356-022-19127-9
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
As persistent and ubiquitous contaminants in water, iodinated X-ray contrast media (ICM) pose a non-negligible risk to the environment and human health. In this study, we investigated the adsorption behavior of two typical ICM compounds, iohexol (IOH) and amidotrizoic acid (DTZ), on magnetic activated carbon. Theoretical investigations, using density functional theory, identified the molecule structures and calculated the molecular diameters of IOH (1.68 nm) and DTZ (1.16 nm), which revealed that ICM could be adsorbed by mesopores and larger micropores. Therefore, magnetic activated carbon with a porous structure was prepared by the co-precipitation method to investigate the adsorption mechanism of IOH and DTZ. MAC-5 (magnetic activated carbon with a theoretical iron oxide content of 37%) showed the best adsorption ability for both IOH and DTZ, with maximum adsorption capacities of 86.05 and 43.00 mg g(-1), respectively. Adsorption kinetics and isotherm models were applied to explore the mechanisms involved, and the effects of solution pH, initial concentration, temperature, ionic strength, and natural organic matter were also investigated. The pore filling effect, pi-pi stacking, hydrogen bonding, and electrostatic interaction, were found to be the main adsorption mechanisms. The co-adsorption data showed that competition may occur in ICM coexisting environments. Interestingly, the used MAC-5 could be successfully regenerated and its adsorption efficiency did not decrease significantly after five cycles, indicating that it is a promising adsorbent for ICM. The results from this study provide some new insights for the treatment of water containing ICM.
引用
收藏
页码:45404 / 45420
页数:17
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