Abstract
The BiFeO3/g-C3N4 heterostructure, which is fabricated via a simple mixing-calcining method, benefits the significant enhancement of the pyrocatalytic performance. With the growth of g-C3N4 content in the heterostructure pyrocatalysts from 0 to 25%, the decomposition ratio of Rhodamine B (RhB) dye after 18 cold-hot temperature fluctuation (25–65 °C) cycles increases at first and then decreases, reaching a maximum value of ∼94.2% at 10% while that of the pure BiFeO3 is ∼67.7%. The enhanced dye decomposition may be due to the generation of the internal electric field which strengthens the separation of the positive and negative carriers and further accelerates their migrations. The intermediate products in the pyrocatalytic reaction also have been detected and confirmed, which proves the key role of the pyroelectric effect in realizing the dye decomposition using BiFeO3/g-C3N4 heterostructure catalyst. The pyroelectric BiFeO3/g-C3N4 heterostructure shows the potential application in pyrocatalytically degrading dye wastewater.
Highlights
The limited clean water has been seriously polluted by a large number of the chemical dyes discharged from the textile and printing industries, which results in aJ Adv Ceram 2021, 10(2): 338–346 internal polarization intensity of the pyroelectric materials so that a charge imbalance forms between the internal polarization charges and the external compensation charges, leading to the separation and migration of these pyroelectrically-induced positive and negative charges to the surface of catalyst
The method of fabricating heterostructure with the narrow-gap semiconductors to enhance catalytic performance has been widely applied in photocatalysis [11,12,13]
Fabricating heterostructure with g-C3N4 has been widely used for improving the catalytic performance in the photocatalytic technology while its reports in pyrocatalysis field are rare up to now [21,22,23]
Summary
The limited clean water has been seriously polluted by a large number of the chemical dyes discharged from the textile and printing industries, which results in aJ Adv Ceram 2021, 10(2): 338–346 internal polarization intensity of the pyroelectric materials so that a charge imbalance forms between the internal polarization charges and the external compensation charges, leading to the separation and migration of these pyroelectrically-induced positive and negative charges to the surface of catalyst. The method of fabricating heterostructure with the narrow-gap semiconductors to enhance catalytic performance has been widely applied in photocatalysis [11,12,13]. Benefitting from the generation of internal electric field on the interface, the heterostructure can strengthen the separation of the positive and negative carriers and further accelerate their migrations [14,15,16]. This method may be available to enhance the pyrocatalytic performance of the pyroelectric materials in theory, which is rarely reported. Fabricating heterostructure with g-C3N4 has been widely used for improving the catalytic performance in the photocatalytic technology while its reports in pyrocatalysis field are rare up to now [21,22,23]
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