从桉树叶片残渣中制备磁性生物炭及其对 Pb(II)的去除性能

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

机构信息

College of Environmental Science and Engineering, Guangxi University, Nanning 530004, China.

出版信息

Bioresour Technol. 2015 Jun;186:360-364. doi: 10.1016/j.biortech.2015.03.139. Epub 2015 Mar 31.

DOI:10.1016/j.biortech.2015.03.139

Abstract

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 120 min with iron leaching amount of 1.1 mg g(-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 41.5 mg g(-1)) was only found in the first regeneration cycle. Magnetic separation performance of adsorbents was not significantly affected by multiple regeneration cycles.

摘要

以 EDTA-2Na 为再生剂研究了用桉树叶残渣制备的负载 Pb 的磁性生物炭的再生。结果发现，在 120 min 内铁浸出量为 1.1 mg g(-1)时，解吸效率为 84.1%。在 6 次再生循环中，再生磁性生物炭的 SBET 和孔体积均较高，FTIR 光谱中没有出现明显的带位移。在第一个再生循环中，仅发现 Pb(II)吸附容量（从 52.4 降至 41.5 mg g(-1)）降低。多次再生循环对吸附剂的磁性分离性能没有显著影响。