Nature-Mimic Method To Fabricate Polydopamine/Graphitic Carbon Nitride for Enhancing Photocatalytic Degradation Performance

Abstract

In this paper, polydopamine/graphitic carbon nitride (PDA/g-C 3 N 4 ) has been synthesized by the dopamine (DA) polymerization modification of the surface of g-C 3 N 4 . For a study of the morphology and optical property of catalysts, the obtained PDA/g-C 3 N 4 composites were characterized by FTIR, XRD, SEM, TEM, BET, XPS, TGA, DRS (diffuse reflectance spectroscopy), photoluminescence, and photocurrent generation. Polydopamine (PDA) plays multiple roles as a light absorption substance, an electron transfer acceptor, and an adhesive interface in the design of PDA/g-C 3 N 4 photosynthetic systems. The optical results demonstrate that PDA has an effect on the PDA/g-C 3 N 4 composite light-harvesting capacity. With an increasing PDA ratio, the photocatalyst's light-harvesting ability was gradually improved. In addition, the 10%PDA/g-C 3 N 4 composite has been shown to be highly efficient for the degradation of the organic dyes methylene blue (MB), Rhodamine B (RhB), and phenol under visible-light irradiation. The degradation efficiency of MB is about 98% in 3 h, and the catalysts can have a degradation efficiency higher than 90% after four cycles. Polydopamine (PDA), as a surface-modified additive with abundant semiquinone and quinone functional ligands, was introduced for an improvement of the transfer ability of photoinduced electrons and accepts them from a semiconductor-based photocatalysis material (g-C 3 N 4 ), which can reduce electron−hole recombination of g-C 3 N 4 and enhance the photocatalytic activity.

Defective Graphitic Carbon Nitride Modified Separators with Efficient Polysulfide Traps and Catalytic Sites for Fast and Reliable Sulfur Electrochemistry

“…The emerging new peak at 790 cm −1 in the spectra of sCNPP indicated the formation of nitrogen‐containing heterocycle between sCN and oxygen‐containing groups of PDA. [ 23,24 ] Furthermore, the slight shift of cyano groups at 2200 cm −1 also suggested the intense interactions between sCN and PDA resulted from electrostatic forces (Figure 4d). Similarly, XPS result verified all of the deconvoluted peaks of N 1s spectra in sCN/PS were shifted to higher BE, with regard to the strong electronic interaction.…”

Biomimetic Design of Hollow Flower‐Like g‐C3N4@PDA Organic Framework Nanospheres for Realizing an Efficient Photoreactivity

“…The charge transfer excitation‐like transition of PDA under visible light, which can lead to photogenerated electron transfer to the conduction band (CB) of g‐C3N4 and accept the holes from the valence band (VB) of g‐C3N4. Consequently, the lifetime of charge carriers over the photocatalyst is prolonged …”

Effect of Mussel‐Inspired Poly(Dopamine)‐Functionalized Carbon Nanotubes/Graphene Nanohybrids on Interfacial Adhesion of Soy Protein‐Based Nanocomposites

“…b, the XRD pattern of CNTs powder showed two characteristic peaks at 2θ = 25.7° and 42.6°, which were assigned to the diffractions of (0 0 2) and (1 0 0) planes of graphite carbon . After the modification of PDA, a new diffraction peak appeared at 2θ = 8.5°, suggesting that the PDA was successfully coated on the surface of CNTs . The XRD patterns of the neat SPI and SPI‐based nanocomposite films are displayed in Fig.…”