Chinese Journal of Catalysis ›› 2017, Vol. 38 ›› Issue (2): 270-277.DOI: 10.1016/S1872-2067(16)62556-1

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Heterojunction between anodic TiO2/g-C3N4 and cathodic WO3/W nano-catalysts for coupled pollutant removal in a self-biased system

Tingting Yua, Lifen Liua,b, Fenglin Yanga   

  1. a Key Laboratory of Industrial Ecology and Environmental Engineering, MOE, School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, Liaoning, China;
    b School of Food and Environment, Dalian University of Technology, Panjin 124221, Liaoning, China
  • Received:2016-07-23 Revised:2016-09-02 Online:2017-02-18 Published:2017-03-14
  • Contact: 10.1016/S1872-2067(16)62556-1
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (21177018, 21677025) and the Program of Introducing Talents of Discipline to Universities (B13012).

Abstract:

An anodic TiO2/g-C3N4 hetero-junction and cathodic WO3/W were used to build a self-sustained catalytic fuel cell system for oxidizing rhodamine B or triclosan and reducing NO3--N to N2 simultaneously. The WO3 nano-catalyst was formed in situ by heating and oxidizing a tungsten wire in air. Cyclic voltammetry and current-time curves were used to characterize the electrochemical properties of the electrodes and system. Aeration and activation of molecular oxygen by self-biased TiO2/g-C3N4 led to the formation of reactive oxidizing species in the fuel cell. The mechanism of simultaneous anodic oxidation of pollutants and cathodic reduction of nitrate was proposed. The spontaneously formed circuit and tiny current were used simultaneously in treating two kinds of wastewater in the reactor chambers, even without light illumination or an external applied voltage. This new catalytic pollution control route can lower energy consumption and degrade many other kinds of pollutants.

Key words: Self-biased system, Hetero-junction, No light irradiation, Low energy consumption, Pollutant degradation