Novel synthesis of MeOx (Ni, Cu, La)@Nano-Co3O4 from combination of complexation and impregnation in ultrasonic intervention for low temperature oxidation of toluene under microwave radiation

Honghong Yi; Zhongyu Yang; Xiaolong Tang; Shunzheng Zhao; Fengyu Gao; Jiangen Wang; Yonghai Huang; Yueqiang Ma; Chao Chu

doi:10.1016/j.ultsonch.2017.07.047

Novel synthesis of MeO_x (Ni, Cu, La)@Nano-Co₃O₄ from combination of complexation and impregnation in ultrasonic intervention for low temperature oxidation of toluene under microwave radiation

Ultrason Sonochem. 2018 Jan;40(Pt A):543-551. doi: 10.1016/j.ultsonch.2017.07.047. Epub 2017 Aug 1.

Authors

Honghong Yi¹, Zhongyu Yang², Xiaolong Tang³, Shunzheng Zhao¹, Fengyu Gao², Jiangen Wang², Yonghai Huang², Yueqiang Ma², Chao Chu²

Affiliations

¹ Department of Environmental Enginnering, School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, PR China; Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, Beijing 100083, PR China.
² Department of Environmental Enginnering, School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, PR China.
³ Department of Environmental Enginnering, School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, PR China; Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, Beijing 100083, PR China. Electronic address: txiaolong@126.com.

PMID: 28946456
DOI: 10.1016/j.ultsonch.2017.07.047

Abstract

Nano-metal binary oxides were prepared by the combined method of complexation and impregnation in ultrasonic intervention for low temperature catalytic oxidation of toluene under microwave radiation. Activity differences of prepared samples were evaluated using the removal rate and the mineralization rate as assessment criteria. Results show that the sample derived from the introduction of La and intervention of ultrasonic presents the best catalytic performance, which the removal rate of 80% can be obtained at 120°C and the mineralization rate of 97% can be obtained at 210°C. Compared with the worst sample at low temperature, maximum increases of removal rate and mineralization rate using the sample of La-Co (US) are 3.47 and 11.79 times respectively. Lowest values of T₉₀ based on removal rate and mineralization rate are 140°C and 195°C, respectively. Compared with the sample that ultrasonic treatment is not applied in impregnation process, maximum increases of removal rate and mineralization rate using the sample of La-Co (US) are 17.43% and 85.19% respectively. Moreover, Diagrams of XRD, EDX and TEM indicate that metal binary oxides nano-particles are synthesized successfully. The data of SEM and XPS manifests that the sample of La-Co (US) possesses the smallest particle size distribution, the highest levels of the Co²⁺/Co³⁺ and the O_latt/O_ads. In addition, significant differences of catalytic activities are not observed after three cycles indicating that the sample possesses good stability and recycling.

Keywords: Complexation reaction; Impregnation; Low temperature oxidation; Microwave radiation; Toluene; Ultrasonic intervention.