Efficient removal of hexavalent chromium through adsorption-reduction-adsorption pathway by iron-clay biochar composite prepared from Populus nigra
Efficient removal of hexavalent chromium through adsorption-reduction-adsorption pathway by iron-clay biochar composite prepared from Populus nigra
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黑杨制备的铁-粘土生物炭复合材料通过吸附-还原-吸附途径高效去除六价铬
DOI：
10.1016/j.seppur.2021.120386
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发表时间：
2021-12
影响因子：
8.6
通讯作者：
Xi Hu
中科院分区：
文献类型：
--
作者：
Lu Zhou;Tianying Chi;Yaoyu Zhou;Jundong Lv;Hong Chen;Shiquan Sun;Xiaofang Zhu;Haipeng Wu;Xi Hu
由侵入性黑杨制备的铁粘土生物炭复合材料 (PFB)，用于去除 Cr(VI)。结果表明，矿物相的表面涂层可以改善生物炭的孔隙结构、氧化还原部分和石墨烯相。 PFB对初始浓度100mg·L-1水溶液中Cr(VI)的吸附率和还原率分别为100%和87.18%，分别是原始生物炭（PB）的3.1和2.1倍。基于模型模拟，PFB去除Cr(VI)是一种混合吸附-还原-吸附方法，包括薄膜静电引力、颗粒内扩散和化学相互作用，其中Cr(III)c的吸附是主要控制步骤。一系列表征表明，-C-O 官能团、Fe(II)octin Fe3O4、Fe(0) 和持久性自由基 (PFR) 是参与 Cr(VI) 去除的重要电子供体。此外，具有类石墨结构的PFB还可以作为电子穿梭，促进Cr(VI)吸附还原。
An iron-clay biochar composite (PFB) prepared from invasivePopulus nigrawas employed for Cr(VI) removal. The results suggested that surface coatings of mineral phases could improve the pore structure, redox moieties, and graphene phase of biochar. The adsorption and reduction rates of Cr(VI) at the initial concentration 100 mg·L-1in aqueous solution by PFB were 100% and 87.18%, respectively, which was 3.1 and 2.1 times higher than the pristine biochar (PB). Based on the model simulation, the Cr(VI) removal by PFB was a mixed adsorption-reduction-adsorption approach including the electrostatic attraction via film and intraparticle diffusion and chemical interactions, in which the adsorption of Cr(III)cwas the main control step. A series of characterizations revealed that -C-O functional groups, Fe(II)octin Fe3O4, Fe(0), and persistent free radicals (PFRs) were the prominent electron donors involved in the Cr(VI) removal. In addition, the PFB with a graphite-like structure could also serve as an electron shuttle to facilitate Cr(VI) adsorption-reduction.
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使用磁性生物炭复合材料吸附和还原水中六价铬的机理见解：Fe3O4 和持久自由基的关键作用
影响因子：
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