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A novel electrochemical modification combined with one-step pyrolysis for preparation of sustainable thorn-like iron-based biochar composites
- Yang, Fan, Zhang, Shuaishuai, Sun, Yuqing, Du, Qing, Song, Jingpeng, Tsang, Daniel C.W.
- Bioresource technology 2019 v.274 pp. 379-385
- adsorbents, adsorption, biochar, carbon electrodes, corn, electric field, electrochemistry, iron oxides, lead, magnetism, moieties, nanoparticles, pyrolysis, wastewater treatment
- A novel method incorporating electrochemical (EC) modification and one-step pyrolysis is developed to prepare sustainable Fe3O4-based magnetic adsorbent (EC-Fe3O4/BC) via pyrolysis of FeCl3-pretreated corn straw-derived biochar under an electric field generated by graphite electrode. Morphological characterization revealed a uniform dispersion of rod-like crystalline Fe3O4 nanoparticles in the inner and outer structure of biochar. The EC modification also introduced more oxygen-containing functional groups, which contributed to an outstanding Pb adsorption capacity (113 mg g−1) and fast kinetics (0.054 g mg−1 h−1). Therefore, the EC modification is a simple and time-saving method to effectively fabricate magnetic biochar adsorbent for high-performance wastewater treatment.