静电纺丝法制备CaIn2O4-In2O3纳米带及其光催化性能

利用静电纺丝技术原位制备了准一维结构CaIn_2O_4-In_2O_3纳米带.采用XRD、SEM、TEM、EDS、UV-vis DRS、N_2吸附-脱附曲线等对合成的光催化剂进行表征,并以对苯二甲酸(TA)为分子探针物质,结合荧光技术探讨了光催化反应过程中·OH自由基的变化.以亚甲基蓝(MB)为降解目标物,考察了CaIn_2O_4-In_2O_3纳米带的光催化活性,并研究了溶液pH及MB初始浓度对其光催化活性的影响.研究结果表明,宽度约为(663±75) nm的CaIn_2O_4-In_2O_3纳米带由直径约为80 nm的纳米颗粒组成,且纳米颗粒之间有一定的孔隙.模拟太阳光辐照120 min,MB的降解率为76%,且降解过程服从一级动力学模型.CaIn_2O_4-In_2O_3纳米带在酸性环境中显正电性,且光催化反应体系中·OH自由基的生成量随反应时间线性增加.CaIn_2O_4与In_2O_3的耦合使得合成的光催化剂在模拟太阳光下具有良好的光催化活性.

Fabrication and photocatalytic activity of CaIn2O4-In2O3 composite nanobelts by electrospinning

One-dimensional CaIn₂O₄-In₂O₃ nanobelts were successfully prepared in-situ by electrospinning method. XRD, SEM, TEM, EDS, UV-vis DRS and N₂ adsorption-desorption isotherms were used to characterize the samples. Terephthalic acid (TA) was used as the ·OH radicals capturer to measure the production of ·OH radicals in the photocatalytic process via a fluorescence spectroscopy. The photocatalytic performance of CaIn₂O₄-In₂O₃ nanobelts was investigated using methylene blue (MB) as the photodegrading target. Meanwhile, the effect of pH and initial concentration of MB on the photocatalytic activity were studied. The results showed that the CaIn₂O₄-In₂O₃ nanobelts (width of (663±75) nm) consist of nanoparticles with a diameter of 80 nm, with different pore size between the nanoparticles. The degradation rate of MB was 76% after irradiated by simulated sunlight for 120 min, and the degradation process was subject to the first-order kinetic model. The CaIn₂O₄-In₂O₃ nanobelts showed positively charge in an acidic solution, and the amount of ·OH radicals increased with the increasing reaction time. The coupling of CaIn₂O₄ and In₂O₃ produced photocatalyst with good photocatalytic performance under simulated sunlight irradiation.