Wenyan Shi

Degradation of halogenated benzenes in solution by electron beam irradiation method.

In this work, the dehalogenation and degradation of halogenated benzenes (chlorobenzenes, bromobenzene) under electron beam radiation were investigated. Several factors affected the degradation of halogenated benzenes by the electron beam radiation method, such as the dose of the electron beam, the initial pH value of the solutions and the kind of halogen. The rule of dehalogenation and degradation followed the order: bromobenzene > 1,2,4‐trichlorobenzene > p‐dichlorobenzene > chlorobenzene. The final products were found to be benzene and diphenyl. Dehalogenation of halogenated benzenes occurred in the presence of NaOH. Based on the results, a general reaction pathway for the degradation of halogenated benzenes is proposed.

Study on the preparation and photocatalytic properties of carbon nanotubes coated with TiO 2 and ZnO nanoparticles

Due to the particular tubular molecular structure, carbon nanotubes exhibit various excellent physical and chemical properties and potential application prospect. With constantly developing preparation technology of carbon nanotubes, decoration and application of carbon nanotubes arouse widespread attention. Carbon nanotubes coated with TiO2 and ZnO nanoparticles (TiO2-CNTs and ZnO-CNTs) were performed by sol method and a part of them were irradiated under electron-beam to be decorated further in the present study. All the prepared nanotubes were characterized by TEM, XRD and BET techniques. Methyl orange solution was used as organic wastewater to be photolyzed to evaluate the photocatalytic activities of the TiO2-CNTs and ZnO-CNTs (both non-irradiated and irradiated). Optimum conditions were determined during the photolysis.

Radiation of Bromobenzene Solution by Ultraviolet and Electron Beam

Halogenated benzenes are chemical materials used widely. In this paper, its degradation and debromination by electron beam was studied. Comparing the pre-and-post of beam radiation, differing from pH conditions, its radiolysis was researched. The results show that degradation of bromobenzene solution by radiolysis of UV and electron beam is feasible.

Study of the catalytic characteristics of metal ions decorated carbon nanotubes for waste water processing under ionizing irradiation

Multiwall and singlewall carbon nanotubes were used as precursors for preparing metal ion-decorated nanotubes. The activated nanotubes catalyze metal deposition specifically onto their surfaces upon wetting the surface of nanotubes. K⁺ , Cu²⁺ , Mg²⁺ , Ca²⁺ and Fe³⁺ decorated singlewall and multiwall carbon nanotubes, were screened for the catalytic activity in reactive violet dye waste water decomposition reaction under ionizing irradiation. It showed that K⁺ , Mg²⁺ , Ca²⁺ decorated multiwall carbon nanotubes have higher catalytic activity than others under different condition, such as basic and acid condition, and different concentration. The catalytic active of decorated nanotubes was improved highly at very low dose.