Interactive Fe2O3/porous SiO2 nanospheres for photocatalytic degradation of organic pollutants: Kinetic and mechanistic approach
Interactive Fe2O3/porous SiO2 nanospheres for photocatalytic degradation of organic pollutants: Kinetic and mechanistic approach
复制标题
用于光催化降解有机污染物的相互作用 Fe2O3/多孔 SiO2 纳米球：动力学和机械方法
DOI：
10.1016/j.chemosphere.2019.06.092
复制
发表时间：
2019
期刊：
影响因子：
8.8
通讯作者：
Patel Raj Kishore
中科院分区：
文献类型：
--
作者：
M;al S;ip;Adhikari Sangeeta;Pu Shengyan;Wang Xiaoke;Kim Do-Heyoung;Patel Raj Kishore
成功地合成了均匀分布的介孔二氧化硅纳米球。采用溶胶-凝胶法制备了不同含量的Fe2O3纳米粒子负载在SiO2纳米球上，并通过煅烧制备了Fe2O3/SiO2纳米球复合材料。对合成的光催化剂进行了晶体结构、形貌、稳定性、比表面积和表面组成的表征。通过在550~560 nm波长范围内具有强吸收的可见光下降解亚甲基蓝和刚果红染料水溶液来评价复合光催化剂的光催化氧化能力。二氧化硅的主要意义是作为催化剂载体，使赤铁矿颗粒均匀分布，从而提高催化反应性。最高的降解已经实现了20重量%的负载量的赤铁矿纳米粒子，表明更少的团聚和更多的催化位点的可用性。此外，在H2O2氧化剂存在下，对2-氯苯酚和2，4-二氯苯酚进行了高效降解。清除剂实验证实，羟基自由基是该催化体系的主要参与物种。该复合系统还显示出良好的可回收性的材料，并主张多种危险的环境污染物的设计系统的有前途的性质。
A uniformly distributed mesoporous silica nanospheres has been successfully synthesized. Silica nanospheres have been loaded with different content of Fe2O3nanoparticles synthesized by the sol-gel process followed by calcination to form the Fe2O3supported on silica nanospheres composite. The as-synthesized photocatalyst has been characterized for crystal structure, morphology, stability, surface area and also surface composition was determined. The photocatalytic oxidation ability of the composite photocatalyst was evaluated by degrading aqueous solutions of Methylene Blue and Congo red dyes under visible light having intense absorption in the wavelength range between 550 and 560 nm. The prime significance of silica is to act as catalyst support for uniform distribution of hematite particles for enhanced catalytic reactivity. Highest degradation has been achieved with 20 wt % loading of hematite nanoparticles indicating the less agglomeration and availability of more catalytic sites. Furthermore, colorless organic pollutants 2-chlorophenol and 2, 4-dichlorophenol have been degraded with high efficiency in the presence of H2O2oxidizer. The scavenger experiments confirmed that hydroxyl radicals are the majorly participating species in this catalytic system. The composite system also shows good recyclability of the materials and advocates the promising nature of the designed system for multiple hazardous environmental contaminants.