화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.92, 77-87, December, 2020
DOI10.1016/j.jiec.2020.08.022  Export Citation
Simultaneous deSOx and deNOx of marine vessels flue gas on ZnO-CuO/rGO: Photocatalytic oxidation kinetics
Hengxiao Man1, Chengxin Wen1, Wei Luo2, Junjie Bian1, 3, †, Wanyuan Wang1, and Wanyuan Wang1
  • 1Key Laboratory of Marine Chemistry Theory and Technology of Ministry of Education, Ocean University of China, Qingdao 266100, China
  • 2School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China
  • 3School of Chemical, Biological, and Materials Engineering, University of Oklahoma, Norman, OK 73019, USA
E-mail:
Marine Pollution Convention has been updated to prevent the excessive emissions from diesel machine. For high concentrated, large fluxed SO2 and NO photocatalytic oxidation, a novel dual stages oxidation-scrubbing process was proposed. The p.n junction ZnO-CuO/rGO ternary catalysts were prepared via the co-precipitation route and supported on reduced graphene oxide (rGO). The UV-vis spectra showed that the bandgap Eg of ZnO-CuO/rGO was notably narrowed to 2.3-2.6 eV for facilitating electron transfer, and its flat band potential of was -0.54 V versus Ag/AgCl. The PL spectra and photocurrent curves revealed that the formation of heterojunctions and the introduction of graphene promoted an efficient separation of the photo-induced charge carriers. The photocatalytic activity of the ZnO-CuO/rGO with 5 wt% GO was evaluated for simultaneous DeSOx and DeNOx, and 97% desulfurization rate and 64% denitration rate could be reached under GHSV 2000 h-1 for 270 min. In seawater scrubber, ZnO-CuO/rGO(5%) addition made SO3 2- conversion was 80.72%. The radical scavenging experiments demonstrated that holes (h+) and superoxide radicals (ㆍO2-) contributed most to SO3 2- photocatalytic oxidation. Kinetic studies showed that SO3 2- oxidation on ZnO-CuO/rGO fitted the L-H model. The mechanism of photocatalytic oxidation in gas and liquid phases were also proposed to address the reaction pathway.
Keywords:Photocatalytic DeSOx/DeNOx;Heterojunction;Graphene;ZnO-CuO;Marine vessel flue gas
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