Abstract Synthesis of mesoporous MnFe2O4 nanocomposites employing a simple one-pot approach of manganese acetate with ferric nitrate at varying surfactant F127 triblock copolymer molar ratios from 0.0075 to 0.020 was conducted, and their impacts on the physical properties, morphology, crystallinity, and photocatalytic performance were investigated. TEM images of the synthesized mesoporous MnFe2O4 nanocomposites exhibit a quasi-spherical structure with 15-20 nm diameters. The lattice spacing of the MnFe2O4 plane (311) was determined by ∼ 0.256 nm, implying the construction of the cubic MnFe2O4 lattice structure. Interestingly, the obtained mesoporous MnFe2O4 nanocomposites have a large surface area of 227 m2/g for the first time. The total pore volume and average pore diameter were measured ∼6.0 nm and 0.33 cm3/g, respectively. The photocatalytic performance of the mesoporous MnFe2O4 nanocomposites for degradation of ciprofloxacin (CIP) was boosted from 50% to 100% by increasing surfactant F127 molar ratios from 0.0075 to 0.020. The photodegradation rate of the synthesized photocatalyst at 0.020 surfactant F127 molar ratio is higher two times than that of the synthesized one at 0.0075 molar ratio. Such high photocatalytic performance of mesoporous MnFe2O4 nanocomposite at high surfactant F127 molar ratio as compared with other samples might be referred to some effects like generation high •OH concentration, reduction of light scattering as a result of large pore volume and high surface area, or a rapid diffusion of the CIP to the active sites through the mesoporous structure.

中文翻译：

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表面活性剂比例对介观结构 MnFe2O4 纳米复合材料及其光催化性能的影响

摘要 采用乙酸锰和硝酸铁的简单一锅法合成介孔 MnFe2O4 纳米复合材料，表面活性剂 F127 三嵌段共聚物摩尔比为 0.0075 至 0.020，并对其物理性质、形貌、结晶度和光催化性能的影响进行了研究。调查。合成的介孔 MnFe2O4 纳米复合材料的 TEM 图像显示出直径为 15-20 nm 的准球形结构。MnFe2O4 平面 (311) 的晶格间距由 ~ 0.256 nm 决定，这意味着立方 MnFe2O4 晶格结构的构造。有趣的是，所获得的介孔 MnFe2O4 纳米复合材料首次具有 227 m2/g 的大表面积。测得的总孔体积和平均孔径分别为~6.0 nm 和0.33 cm3/g。通过将表面活性剂 F127 的摩尔比从 0.0075 增加到 0.020，介孔 MnFe2O4 纳米复合材料降解环丙沙星 (CIP) 的光催化性能从 50% 提高到 100%。表面活性剂F127摩尔比为0.020时合成的光催化剂的光降解率是0.0075摩尔比时合成光催化剂的两倍。与其他样品相比，在高表面活性剂 F127 摩尔比下，介孔 MnFe2O4 纳米复合材料具有如此高的光催化性能，这可能是由于产生高•OH 浓度、由于大孔体积和高表面积导致的光散射减少、或CIP 通过介孔结构快速扩散到活性位点。