Adsorption characteristics of ciprofloxacin on the schorl: kinetics, thermodynamics, effect of metal ion and mechanisms

Journal of Water Reuse and Desalination

Shi, Jing¹  He, Zexiang¹  Yin, Danyang²  Shen, Lili³  Xu, Zhengwen⁴ 

[1]Technology, 210044 Nanjing, China

[2]Department of Environmental Science, China Pharmaceutical University, 211198 Nanjing, China

[3]Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Nanjing University of Information Science &

[4]School of Environmental Science and Engineering, Nanjing University of Information Science &

关键词: adsorption;    ciprofloxacin;    coexisting ions;    pH;    schorl;   

DOI  :  10.2166/wrd.2017.143

学科分类：工程和技术（综合）

来源: IWA Publishing

【 摘 要 】

In this study, schorl was used as an effective adsorbent for ciprofloxacin removal from wastewater. The adsorption performance, mechanism and effect of metal ion on sorption were investigated. Adsorption capacity reached a maximum (8.49 mg/g) when the pH value was 5.5. The pseudo-second-order kinetic model and Freundlich model could better describe the experimental data. The negative ΔH (–22.96 KJ/mol) value showed that the adsorption process was exothermic. The results also indicated physical adsorption existed on the adsorption process, which was in agreement with the analysis of X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy. The desorption rate could reach 94%, which suggested that schorl had a good desorption and regeneration performance. Coexisting ions, such as Cu2+ and Al3+, could obviously inhibit adsorption, and the inhibition from Al3+ was significantly higher than that from Cu2+. However, the additional Zn2+ could slightly promote the adsorption.

【 授权许可】

CC BY-NC-ND