摘要
首先利用沉淀法合成了BiOCl纳米片,然后利用研磨-焙烧法将La2O3纳米颗粒复合到BiOCl纳米片中,制备了一系列La2O3/BiOCl复合光催化剂(La2O3:1wt%、2wt%、4wt%、8wt%)。运用X射线粉末衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)、光电子能谱(XPS)、紫外-可见漫反射光谱(UV-Vis DRS)、傅里叶红外光谱(FT-IR)和光致发光(PL)谱等对样品的晶相、光吸收和表面性能等进行了表征。以紫外灯(λ=254 nm)为光源,评价了所制备样品光催化降解高浓度染料酸性橙II(40×10-6)的活性。结果表明,经过研磨-焙烧后该系列催化剂均具有较好的结晶性能,同时2~5 nm的La2O3纳米粒子粘附在BiOCl纳米片表面。200℃焙烧制备的1wt%La2O3/BiOCl催化剂具有丰富的表面羟基,对染料表现出较强的吸附性能。该催化剂表现了最高的光催化活性,活性为纯BiOCl的2.4倍。另外,La2O3/BiOCl中的La3+提供的氧化-还原势阱可能捕获光生电子,从而阻止了光生电子(e–)和空穴(h+)的复合,有利于光催化活性的提高。
BiOCl nanoplates were firstly prepared by precipitation method and then La2O3/BiOCl composite photocatalysts with different La2O3 contents(1wt%, 2wt%, 4wt%, 8wt%) were synthesized by grinding-calcination procedure. The physical chemistry properties of the as-prepared photocatalysts were characterized by powder X-ray diffraction(XRD), scanning electron microscope(SEM), transmission electron microscope(TEM), UV-Vis diffuse reflectance spectroscope(DRS), X-ray photoelectron spectroscope(XPS), Fourier transformed infrared spectroscope(FT-IR), and photoluminescence(PL) spectroscope. The photocatalytic activity of the samples was evaluated by photocatalytic degradation of high concentration acid orange II(40×10-6) under UV light(λ=254 nm) irradiation. Results showed that the as-prepared samples have good crystallinity. La2O3 particles with the size of 2–5 nm were closely combined with BiOCl nanoplate after grinding-calcination treatment. La2O3/BiOCl composite photocatalysts with 1wt% La2O3 calcined at 200 displayed the best photocatalytic activity℃ which is 2.4 times of that of pure BiOCl. The produced La2O3/BiOCl has abundant surfaceOH groups and highly suitable adsorption of dye. Moreover, La3+ could capture the photon-generated electrons(e-) and prevent the recombination of photon-generated and holes(h+).
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2015年第9期943-949,共7页
Journal of Inorganic Materials
基金
国家自然科学基金(21067004
21263005)
江西省自然科学基金青年科学基金(20133BAB21003)
江西省教育厅高等学校科技落地计划项目(KJLD14046)
江西省青年科学家培养项目(20122BCB23015)
江西省远航工程~~