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First Author: DOU Shuai
Abstract:

A fish scale-based porous activated biochar with defined pore size (DPBC) was fabricated by a one-step calcination and activation method. The DPBC possessed an ultrahigh specific surface area of 3370 m2 g-1 and its pore diameter centered at 1.49 nm which fits into the ciprofloxacin (CIP) molecular dimension, making it an ideal adsorbent for CIP adsorption due to the molecular pore-filling effect. The maximum Langmuir monolayer adsorption capacity of DPBC for CIP was higher than 1000 mg g-1 and the equilibrium time was less than 4 h, superior to most adsorbents reported in literature. Thermodynamic analysis indicated the adsorption process was spontaneous and endothermic. Notably, fixed-bed experiments showed an encouraging adsorption performance towards CIP, with a high saturated dynamic adsorption capacity of 880.3 mg g-1. Both Thomas and Yoon-Nelson models predict the fixed-bed column adsorption performance well. Hydrophobic effect, π-π interaction, π-π EDA, cation exchange, hydrogen bonding formation, pore filling effect, electrostatic and cation-π interaction involved in the CIP adsorption on the DPBC.

An activated porous fish-scale-based biochar with ultrahigh surface area and defined pore size fitting CIP molecular has been prepared. Fixed-bed experiments showed an encouraging performance of it towards CIP removal, with a high saturated dynamic adsorption capacity, suggesting its potential for practical application.

Contact the author: ZHENG Yu-Ming
Page Number: 131962
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PubYear: January 2022
Volume: 287
Publication Name: CHEMOSPHERE
The full text link: https://doi.org/10.1016/j.chemosphere.2021.131962
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