Unraveling influence of metal species on norfloxacin removal by mesoporous metallic silicon adsorbent
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RESEARCH ARTICLE
Unraveling influence of metal species on norfloxacin removal by mesoporous metallic silicon adsorbent Guiquan Che 1 & Qiuyun Zhang 1,2,3,4 & Lin Lin 1 & Weirui Chen 1,2,3,4 & Xukai Li 1,2,3,4 & Laisheng Li 1,2,3,4 Received: 16 April 2020 / Accepted: 22 June 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Metal-modified adsorbent had appreciable adsorption capacity and fast rate toward norfloxacin (NOR), but limited studies focused on the influence of metal species on adsorbents’ performance. In this study, Fe and Cu were chosen to be loaded on mesoporous silicon SBA-15 for absorbing NOR and investigating the key function of metal species. An obvious synergy effect was found between active species and supporter. A high adsorption capacity (44.8 mg g−1 for Fe/SBA-15 and 78.3 mg g−1 for Cu/ SBA-15) and short equilibration time (< 2 h) were obtained. NOR adsorptions on two processes were described well by pseudosecond-order kinetics, particle diffusion equation, and Langmuir isotherm. The adsorption processes were spontaneous, but NOR adsorption on Cu/SBA-15 was endothermic while its adsorption on Fe/SBA-15 was exothermic. HA had dual effect on the adsorption efficiency, with a promotion at low HA concentration but an inhibition at high concentration. NOR removal increased first and then decreased with pH ascension from 3 to 9 for both Fe/SBA-15 and Cu/SBA-15, achieving maximum at pH = 7. Comparative characterizations and experiments suggested that NOR adsorption processes were dominated by electrostatic interactions, n-π EDA interactions, hydrogen bonds, and surface complex. The greater n-π EDA and complex efficiency of Cu with NOR resulted in the superior performance of Cu/SBA-15.
Keywords Mesoporous metallic silicon adsorbent . Adsorption . Norfloxacin . Mechanism
Highlights • A synergistic effect between active species and supporter on NOR adsorption was found. • Greater n-π EDA and complex efficiency with NOR led to better performance of Cu/SBA-15. • Solution pH value had great influence on NOR adsorption by Cu/SBA15 and Fe/SBA-15. • Cu/SBA-15 and Fe/SBA-15 had high NOR adsorption capacity as 78.3 and 44.8 mg g-1. Responsible editor: Tito Roberto Cadaval Jr Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11356-020-09829-3) contains supplementary material, which is available to authorized users. * Weirui Chen [email protected] * Laisheng Li [email protected] 1
School of Environment, South China Normal University, Guangzhou 510006, China
2
Key Laboratory of Theoretical Chemistry of Environment, Ministry of Education, Guangzhou 510006, China
3
Guangdong Provincial Engineering Technology Research Center for Drinking Water Safety, Guangzhou 510006, China
4
Guangdong Provincial Key Lab of Functional Materials for Environmental Protection, Guangzhou 510006, China
Environ Sci Pollut Res
Introduction Nowadays, society have eyewitnessed the wide application of antibiotics in medical care and aquaculture (Tan et al. 2016; Yan
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