An efficient adsorbent: Simultaneous activated and magnetic ZnO doped biochar derived from camphor leaves for ciprofloxacin adsorption

• Published in: Bioresource technology 2019-09, Vol.288, p.121511, Article 121511
• Main Authors: Hu, Yi, Zhu, Yuan, Zhang, Yi, Lin, Tang, Zeng, Guangming, Zhang, Siyu, Wang, Yingrong, He, Wenze, Zhang, Mingjuan, Long, Huai
• Format: Article
• Language: English
• Subjects: Camphor leaves; Ciprofloxacin; Magnetic biochar; ZnCl2 activation
• ISSN: 0960-8524; 1873-2976
• DOI: 10.1016/j.biortech.2019.121511

•A simple and efficiency method for raising the specific surface area is proposed.•BC-2-650 has a terrific (449.40 mg L−1) adsorption capacity and separates easily.•BC-2-650 showed a stable and fast CIP adsorption as compared to other adsorbents.•Physical adsorption and chemisorption mechanism of ciprofloxacin were illustrated. In this work, a novel magnetic biochar of camphor leaf with large micropore area was prepared for ciprofloxacin removal. Biochar show the advantage of resource utilization, as an adsorbent in pollutant removal, but limited by its relatively low specific surface area and poor adsorption capacity. An efficient method was formulated to prepare ZnO nanoparticle modified magnetic biochar to adsorb ciprofloxacin. The biochar with ZnCl2/biochar mass ratio of 2 at the calcination temperature of 650 °C was a typical microporous material with huge surface area (915 m2 g−1). The maximum ciprofloxacin adsorption capacity of the biochar reached 449.40 mg L−1. The adsorption mechanism was discussed in terms of physical adsorption and chemisorption involving intense π-π stacking interaction, electrostatic interaction, cation exchange interaction etc. The adsorption capacity of biochar did not decline adsorption capacity significantly after 3 times regeneration. It provides a recycle and reuse way for camphor leaves resource disposal.