615-67-8Relevant articles and documents
Photochemistry of Semiconductor Particles. Part 4. - Effects of Surface Condition on the Photodegradation of 2,4-Dichlorophenol catalysed by TiO2 Suspensions
Zang, Ling,Liu, Chun-Yan,Ren, Xin-Min
, p. 917 - 924 (1995)
The photocatalysed degradation of 2,4-dichlorophenol (DCP) has been investigated in aqueous suspensions of TiO2.A possible reaction scheme has been proposed for the degradation, in which chlorobenzoquinone (CBQ) was detected as a predominant intermediate present in the reaction solution.Kinetic details for the degradation steps have been analysed based on the experimental results.The essential role of oxygen was considered to be the capturing of the photogenerated electron to form the oxidizing species, such as H2O2, HO2(.) and OH(.).In anaerobic conditions, the photodegradation rate was quite low even with the adsorbed Cu(2+) ion on the TiO2 powder as an alternative electron scavenger.This is due to the rapid indirect recombination of the photogenerated electron and hole, which is mediated by the short-circuiting reaction of Cu(2+).However, in aerobic conditions, oxygen takes up the photogenerated electron trapped at the adsorbed Cu(2+) ion to prevent it from recombining with the photogenerated hole.As a result, the hole has sufficient opportunity to participate in the oxidizing reactions.The degradation rate was dependent to some extent on the surface charge of the TiO2 particles.Positive charge always promotes the photodegradation, whereas negative change is detrimental.This was attributed to the effects of surface charge on the migration of electrons from the interior of the TiO2 particles to the surface.
Photochemical transformations of 2, 6-dichlorophenol and 2-chlorophenol with superoxide ions in the atmospheric aqueous phase
Dong, Linchang,Hu, Shuheng,Lu, Jun,Peng, Shuchuan,Zhu, Chengzhu,Zhu, Mengyu
, (2022/04/03)
The possible photochemical transformation pathways of chlorophenols (2, 6-dichlorophenol and 2-chlorophenol) with superoxide anion radical (O2·?) were studied by steady-state irradiation and 355 nm laser flash photolysis technique. O
Preparation method of sesamol
-
Paragraph 0022; 0026; 0028-0029, (2021/11/21)
The invention belongs to the technical field of compound synthesis, and particularly relates to a preparation method of sesamol, which firstly prepares 2 -chloro -1, 4 -diphenol, and then 2 - chlorine -1, 4 -biphenol and sodium hydroxide in an aqueous solution to obtain the sesamol, namely 1 2, 1 2 4 - 4 -triphenol and dichloromethane. The invention provides a new method for preparing the sesame phenol, and the yield of the sesamol is remarkably improved.
Pompon Dahlia-like Cu2O/rGO Nanostructures for Visible Light Photocatalytic H2 Production and 4-Chlorophenol Degradation
Karthikeyan, Sekar,Ahmed, Kassam,Osatiashtiani, Amin,Lee, Adam F.,Wilson, Karen,Sasaki, Keiko,Coulson, Ben,Swansborough-Aston, Will,Douthwaite, Richard E.,Li, Wei
, p. 1699 - 1709 (2020/02/11)
Hierarchical Cu2O nanospheres with a Pompon Dahlia-like morphology were prepared by a one-pot synthesis employing electrostatic self-assembly. Nanocomposite analogues were also prepared in the presence of reduced graphene oxide (rGO). Photophysical properties of the hierarchical Cu2O nanospheres and Cu2O/rGO nanocomposite were determined, and their photocatalytic applications evaluated for photocatalytic 4-chlorophenol (4-CP) degradation and H2 production. Introduction of trace (2O for H2 production from 2.23 % to 3.35 %, giving an increase of evolution rate from 234 μmol.g?1.h?1 to 352 μmol.g?1.h?1 respectively. The AQE for 4-CP degradation also increases from 52 % to 59 %, with the removal efficiency reaching 95 % of 10 ppm 4-CP within 1 h. Superior performance of the hierarchical Cu2O/rGO nanocomposite is attributable to increased visible light absorption, reflected in a greater photocurrent density. Excellent catalyst photostability for >6 h continuous reaction is observed.
