Key Laboratory of Ministry of Education for Advanced Materials in Tropical Island Resources, School of Chemical Engineering and Technology, Hainan University, Haikou 570228, PR China.
Key Laboratory of Ministry of Education for Advanced Materials in Tropical Island Resources, School of Chemical Engineering and Technology, Hainan University, Haikou 570228, PR China; School of Science, Hainan University, Haikou 570228, PR China; Hainan Provincial Key Lab of Fine Chem, School of Chemical Engineering and Technology, Hainan University, Haikou 7570228, PR China.
Bioresour Technol. 2020 Nov;315:123797. doi: 10.1016/j.biortech.2020.123797. Epub 2020 Jul 9.
Fenton modification, involving iron-promoted pyrolysis followed by HO oxidation, was first employed to improve the adsorptive and magnetic capabilities of biochar. Modified biochars were prepared from rubber tree bark and coconut shell through iron-promoted pyrolysis and subsequent HO oxidation, and their adsorption behaviors toward Cr (VI) and MB were evaluated in aqueous solution. The modified biochars pyrolyzed at 300 and 400 ˚C displayed much higher adsorption capabilities than corresponding pristine biochars for Cr (VI) and MB, respectively, ascribing to introduction of COOH, CO and C-O groups by Fenton oxidation. More importantly, saturation magnetization could be enhanced by transforming nonmagnetic iron oxides into γ-FeO through HO oxidation. The removal of Cr (VI) and MB could be primarily contributed to the adsorption of biochar matrix by reduction/hydrogen bonding/cation exchange/electrostatic interaction and hydrogen bonding/cation exchange/electrostatic interaction, respectively. This would provide a novel and efficient strategy for making highly adsorptive magnetic biochar.
芬顿改性，涉及铁促进的热解，随后是 HO 氧化，首次被用于提高生物炭的吸附和磁性能力。通过铁促进的热解和随后的 HO 氧化，从橡胶树树皮和椰子壳制备改性生物炭，并在水溶液中评估它们对 Cr(VI)和 MB 的吸附行为。在 300 和 400°C 下热解的改性生物炭对 Cr(VI)和 MB 的吸附能力分别比相应的原始生物炭高得多，这归因于 Fenton 氧化引入了 COOH、CO 和 C-O 基团。更重要的是，通过 HO 氧化将非磁性氧化铁转化为 γ-FeO 可以增强饱和磁化强度。Cr(VI)和 MB 的去除主要归因于还原/氢键/阳离子交换/静电相互作用和氢键/阳离子交换/静电相互作用对生物炭基质的吸附。这为制备高吸附性磁性生物炭提供了一种新颖而有效的策略。
