Regeneration of magnetic biochar derived from eucalyptus leaf residue for lead(II) removal

• Published in: Bioresource technology Vol. 186; pp. 360 - 364
• Main Authors: Wang, Sheng-ye, Tang, Yan-kui, Chen, Cheng, Wu, Jin-tao, Huang, Zhining, Mo, Ya-yuan, Zhang, Kai-xuan, Chen, Ji-bo
• Format: Journal Article
• Language: English
• Published: England Elsevier Ltd 01.06.2015
• Subjects: Adsorbent regeneration; Adsorption; Charcoal - chemistry; China; Edetic Acid; Eucalyptus - chemistry; Iron - isolation & purification; Lead - isolation & purification; Lead adsorption; Magnetic biochar; Magnetics; Plant Leaves - chemistry; Separation; Spectroscopy, Fourier Transform Infrared; Water Pollutants, Chemical - isolation & purification; Water Purification - methods; China; Lead adsorption; Separation; Magnetic biochar; Adsorbent regeneration
• ISSN: 0960-8524; 1873-2976
• DOI: 10.1016/j.biortech.2015.03.139

[Display omitted] •EDTA-2Na was effective for Pb(II) desorption and adsorbent regeneration.•Leaching amount of Fe ions was around 1mg/g in each regeneration cycle.•Higher SBET and pore volume were found in regenerated adsorbents.•Pb(II) removal efficiency maintains in certain level after six regeneration cycles.•Regenerated adsorbents showed good magnetic separation performance. Regeneration of Pb-loaded magnetic biochar prepared with eucalypts leaf residue was studied by using EDTA-2Na as a regenerant. The desorption efficiency was found to be 84.1% in 120min with iron leaching amount of 1.1mgg−1. Higher SBET and pore volume were observed in regenerated magnetic biochars and no significant band shifts occurred in FTIR spectra during 6 regeneration cycles. The decrease of Pb(II) adsorption capacity (from 52.4 to 41.5mgg−1) was only found in the first regeneration cycle. Magnetic separation performance of adsorbents was not significantly affected by multiple regeneration cycles.