Graphene oxide-promoted Ti/PbO 2 photoanode with photoelectric synergy effect for efficient photoelectrocatalytic degrad
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Graphene oxide-promoted Ti/PbO2 photoanode with photoelectric synergy effect for efficient photoelectrocatalytic degradation of reactive brilliant blue Wenfeng Li1, Huiru Ma-An1, Yinghuan Fu1, Chun Ma1, Guowen Wang1,*, Xiaoli Dong1, and Hongchao Ma1,* 1
School of Light Industry & Chemical Engineering, Dalian Polytechnic University, No. 1 Qinggongyuan, Ganjingzi District, Dalian 116034, People’s Republic of China
Received: 7 August 2020
ABSTRACT
Accepted: 20 November 2020
The development of semiconductor-based photoelectrocatalysts with superior activity is of great importance for water purification. Here, we fabricated graphene oxide (GO)-wrapped Ti/PbO2 photoanodes by combination of electrochemical deposition and electrophoretic deposition process. The as-obtained composite electrodes showed better performance for photoelectrocatalytic (PEC) degradation of reactive brilliant blue KN-R, as compared with that of Ti/PbO2 reference. Experimental results demonstrated that the efficient PEC performance of graphene oxide (GO)-wrapped Ti/PbO2 photoanodes could be ascribed to the low charge transfer resistance, large electrochemical active areas, and high separation efficiency of induced electrons/holes. Furthermore, a significant photoelectric synergy effect can be observed for the graphene oxide (GO)wrapped Ti/PbO2 photoanodes during the photoelectrocatalytic process.
Published online: 30 November 2020
Springer Science+Business
Media, LLC, part of Springer Nature 2020
Introduction In recent years, various advanced electrochemical oxidation processes (EAOP) have been developed to remove organic pollutants in wastewater and avoid endangering human normal production and life due to environmental accumulation. Photoelectrocatalysis (PEC) has become a highly efficient EAOP with great
development prospects by combining photocatalysis and electrolysis [1, 2]. It is understood that the use of proper anodic materials in anodic oxidation treatment can remove organic pollutants completely [3]. In various anode materials, such as SnO2, TiO2 or Co3O4 and PbO2 have been reported. Although SnO2 anode has high oxygen evolution potential, its service life is very short [4]. TiO2 is an intrinsic semiconductor with a band gap of 3.2 eV and a small surface
Handling Editor: Catalin Croitoru.
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https://doi.org/10.1007/s10853-020-05604-4
4742 area. It can only absorb ultraviolet light in the solar spectrum. However, the ultraviolet light in sunlight is only less than 5%, so the quantum yield of TiO2 is low [5, 6]. Co3O4 needs further modification before it can be used due to its shortcomings such as low conductivity and utilization [7]. Nevertheless, PbO2 material has been widely applied in electrocatalytic procedure due to its high conductivity, low cost and chemical inertness [8, 9]. Especially, some previous works demonstrated that the PbO2 electrode has negligible environmental impact under electrocatalytic conditions [10, 11]. Although PbO2 is an excellent
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