Ajibade Peter A, Nnadozie Ebenezer C
School of Chemistry and Physics, University of KwaZulu-Natal, Private Bag X01, Scottsville, Pietermaritzburg 3209 South Africa.
ACS Omega. 2020 Dec 11;5(50):32386-32394. doi: 10.1021/acsomega.0c04404. eCollection 2020 Dec 22.
Solar-moderated adsorptions of indigo carmine and methylene blue dyes were investigated using manganese and zinc ferrite capped with biochar prepared from the root of . TEM micrograph of the as-prepared manganese ferrite nanocomposites (MnFeO@BC) revealed octagonally shaped particles with an average size of 42.64 nm while the zinc ferrite nanocomposite (ZnFeO@BC) micrograph revealed mixtures of rod- and cone-shaped particles with an average size of 43.82 nm. Biochar capping of MnFeO@BC reduced the band gap from 3.63 to 2.08 eV. The nanocomposite surface areas were 197.64 and 92.14 m/g for MnFeO@BC and ZnFeO@BC, respectively. Photoadsorption of the as-prepared nanocomposites showed that 10 mg of ZnFeO@BC effectively removed 69.07 and 98.60% of 70 mg/L indigo carmine and methylene blue dyes while MnFeO@BC removed 77.65 and 94.83% of indigo carmine and methylene blue dyes after 2 h of equilibration under visible light irradiation, respectively. The nonlinear form of the Langmuir isotherm had a better approximation to the experimental solid-phase concentration ( ) for the adsorption of indigo carmine dye using both nanocomposites. In contrast, the linear form gave a better goodness-of-fit for the adsorptions of methylene blue dye. The manganese ferrite (MnFeO@BC) and zinc ferrite (ZnFeO@BC) nanocomposites showed no inhibition of and , which indicates that they could be used for both biological and environmental applications.
使用由[植物名称]根制备的生物炭包覆的锰铁氧体和锌铁氧体，研究了太阳能调节的靛蓝胭脂红和亚甲基蓝染料的吸附。所制备的锰铁氧体纳米复合材料（MnFeO@BC）的透射电子显微镜图像显示为八边形颗粒，平均尺寸为42.64nm，而锌铁氧体纳米复合材料（ZnFeO@BC）的显微镜图像显示为棒状和锥形颗粒的混合物，平均尺寸为43.82nm。MnFeO@BC的生物炭包覆将带隙从3.63eV降低到2.08eV。MnFeO@BC和ZnFeO@BC的纳米复合材料表面积分别为197.64和92.14m²/g。所制备的纳米复合材料的光吸附表明，在可见光照射下平衡2小时后，10mg的ZnFeO@BC有效去除了70mg/L靛蓝胭脂红和亚甲基蓝染料中的69.07%和98.60%，而MnFeO@BC分别去除了靛蓝胭脂红和亚甲基蓝染料中的77.65%和94.83%。对于使用两种纳米复合材料吸附靛蓝胭脂红染料，Langmuir等温线的非线性形式对实验固相浓度（ ）有更好的近似。相比之下，线性形式对亚甲基蓝染料的吸附拟合优度更好。锰铁氧体（MnFeO@BC）和锌铁氧体（ZnFeO@BC）纳米复合材料对[两种物质名称]均无抑制作用，这表明它们可用于生物和环境应用。
