Bio-regeneration of spent Fe3O4 laden quaternary-ammonium shaddock peel after perchlorate capture: Considering the oxygen, coexisting anions, bio-fouling and indirect bio-regeneration

Publication date: 15 May 2017 Source:Chemical Engineering Journal, Volume 316 Author(s): Yuanfeng Qi, Xing Xu, Cao Qi, Xi Fei A new bio-sorbent based on the shaddock peel was prepared for perchlorate capture. The shaddock peel was introduced with quaternary-ammonium groups and Fe3O4 nanoparticles, forming the Fe3O4 laden quaternary-ammonium shaddock peel (Fe3O4-QA-SP). Bio-regeneration of perchlorate laden Fe3O4-QA-SP considering the oxygen, coexisting anions, bio-fouling and indirect bio-regeneration was conducted. Results indicated that the bio-reduction rate increased as the increase in the amounts of perchlorate laden on Fe3O4-QA-SP and the optimal reduction rates (0.0226–0.0865mgp/mgss/d) were obtained at pH 7.0. Bio-reduction of laden perchlorate in the presence of Cl− (indirect bio-regeneration) help to keep a relatively high capture capacity (86.5%) of Fe3O4-QA-SP for perchlorate even after 7 cycles of indirect bio-regeneration. In contrast, only 58.3% of capture capacity was left after 3rd of direct bio-regeneration. Bio-fouling was also observed on surface of Fe3O4-QA-SP after sterilization process. Graphical abstract
Source: Chemical Engineering Journal - Category: Chemistry Source Type: research