School of Chemistry and Environment, South China Normal University, Guangzhou 510006, PR China.
J Hazard Mater. 2012 Mar 30;209-210:137-45. doi: 10.1016/j.jhazmat.2012.01.006. Epub 2012 Jan 10.
A novel microsphere-like BiOI hierarchical material was successfully synthesized by a one-step solution method at room temperature using polyvinylpyrrolidone (PVP) as structure directing reagent, its morphology, structure, surface area, photoabsorption were characterized, and the removal of tetracycline hydrochloride (TC) was evaluated under dark adsorption and visible light irradiation. It was shown that the BiOI microspheres formed in the precursor solution with PVP exhibit a mesoporous surface layer, 28.1m(2)g(-1) surface area, 1.91 eV band gap energy (E(g) value), and twofold removal ability to tetracycline hydrochloride (TC), i.e. adsorptive separation and visible light photocatalytic degradation. The adsorption process of TC on BiOI microspheres can be described by pseudo-second-order kinetics model and both Freundlich and Langmuir equations well described the adsorption isotherm but the former is better. More importantly, the BiOI microspheres exhibit an excellent photocatalytic degradation and mineralization capability to TC under visible light irradiation, which comes from its electronic band structure, high surface area and high surface-to-volume ratio. In addition, the BiOI microspheres are stable during the reaction and can be used repeatedly, showing promising prospect for the treatment of TCs in future industrial application.
一种新型的类球形 BiOI 分层材料通过一步室温溶液法成功合成，使用聚乙烯吡咯烷酮（PVP）作为结构导向试剂。对其形貌、结构、比表面积、光吸收等进行了表征，并在黑暗吸附和可见光照射下评估了其对盐酸四环素（TC）的去除效果。结果表明，在含有 PVP 的前驱体溶液中形成的 BiOI 微球具有介孔表面层、28.1m(2)g(-1)的比表面积、1.91eV 的能带隙能量（E(g)值），对盐酸四环素（TC）具有两倍的去除能力，即吸附分离和可见光光催化降解。TC 在 BiOI 微球上的吸附过程可以用伪二级动力学模型来描述，Freundlich 和 Langmuir 方程都很好地描述了吸附等温线，但前者更好。更重要的是，BiOI 微球在可见光照射下对 TC 具有优异的光催化降解和矿化能力，这源于其电子能带结构、高比表面积和高表面积与体积比。此外，BiOI 微球在反应过程中稳定且可重复使用，为未来工业应用中处理 TC 提供了广阔的前景。
