光催化
氯化石蜡
纳米颗粒
光化学
傅里叶变换红外光谱
化学
矿化(土壤科学)
X射线光电子能谱
涂层
化学工程
材料科学
纳米技术
催化作用
有机化学
工程类
氮气
作者
Wei Xiong,Xinyong Li,Qidong Zhao,Yixiang Shi,Ce Hao
标识
DOI:10.1016/j.jhazmat.2018.07.066
摘要
Short chain chlorinated paraffins (SCCPs) have attracted increasing attention recently due to their widespread occurrence and persistence in the environment, long-distance transport, and bioaccumulation and toxicity. For the sake of photocatalytic elimination of SCCPs, a kind of polydopamine (PDA) based photocatalyst, echinus-like Fe2O3@PDA-Ag hybrids have been synthesized via coating Fe2O3 with PDA by self-polymerization of dopamine and further loading silver nanoparticles by in situ reduction onto the surface of PDA shell. The photogenerated charges of Fe2O3@PDA-Ag hybrids exhibit long lifetime from transient photovoltage signal, which is of benefit to participate in various subsequent reaction processes before their recombination. Benefiting from the coating of PDA shell and the deposition of Ag nanoparticles, Fe2O3@PDA-Ag hybrids exhibit enhanced photocatalytic activity for the removel of SCCPs as investigated by the in situ Fourier transform infrared spectroscopy, 2.9 times as high as that of Fe2O3, due to the reactive OH radicals. The density functional theory simulation demonstrates the key mechanism of the formation of conjugate bond in the dechlorination process as well as the final product of HCl. The simulation indicates that there are no regularities for the H-abstraction but the dechlorination usually occurs in the adjacent Cl atoms next to the C with H-abstraction.
科研通智能强力驱动
Strongly Powered by AbleSci AI