Twice-milled magnetic biochar: A recyclable material for efficient removal of methylene blue from wastewater

Nina Yan, Biao Hu, Zhiyu Zheng, Haiying Lu, Jingwen Chen, Xiaomei Zhang, Xizhi Jiang, Yonghong Wu, Jan Dolfing, Lei Xu

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


Although magnetic modification has potential for preparing recyclable biochar, the traditional preparation methods of loading magnetic materials on biochar will probably lead to pore blockage and consequently remarkable adsorption recession. Herein, a preparation method was developed in which ball milled biochar was loaded with ultrafine magnetite and then milled for a second time, thus generating a magnetic, recyclable biochar with minimal pore blockage. The deposits of magnetite did not significantly wrap the biochar, although a decreased sorption performance was still detectable. Benefitting from the extra milling step, surface functional groups and specific surface areas of the adsorbents were largely restored, thus leading to a 93.8 % recovery adsorption of 84.6 ± 2.5 mg/L on methylene blue. Meanwhile, the recyclability of the material was not affected. The adsorption was driven by multiple interactions. These twice-milled magnetic biochar is quite outstanding for sustainable removal of aqueous contaminants with its recyclability and high sorption efficiency. [Abstract copyright: Crown Copyright © 2023. Published by Elsevier Ltd. All rights reserved.]
Original languageEnglish
Article number128663
Pages (from-to)1-8
Number of pages8
JournalBioresource Technology
Early online date21 Jan 2023
Publication statusPublished - 1 Mar 2023


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