Soft‐Template Synthesis of Hybrid Carbon and Carbon Nitride Composites with Enhanced Photocatalytic Activity for the Degradation of Methylene Blue under Visible Light

Abstract

The porous hybrid carbon and carbon nitride composites (C/CN‐P123‐x) with higher adsorption capacity and improved photocatalytic activity for methylene blue (MB) degradation were obtained using partially formaldehyde‐modified dicyandiamide and amphiphilic block polymers (P123) as precursor and soft‐template, respectively. The structures of as‐prepared composites were analyzed by thermogravimetric analysis, X‐ray diffraction, elemental analysis, nitrogen adsorption–desorption, scanning electron microscopy, transmission electron microscopy, photoluminescence spectroscopy, and X‐ray photoelectron spectroscopy. The effect of carbon content on the structure of the composites and the catalytic activity for the photodegradation of MB were determined under visible light. The optimal carbon content is determined to be 27.17 wt % on the C/CN‐P123‐0.8 with MB photodegradation rate of 0.0115 min−1, which was 1.92 times higher than that of C/CN‐P123‐0. The remarkably increased photocatalytic performance arises from the synergistic effect of hybrid carbon and graphitic carbon nitride. Also, the possible degradation mechanism of C/CN‐P123‐0.8 for MB was proposed. © 2019 American Institute of Chemical Engineers Environ Prog, 38:e13146, 2019

Matrix Doped C3N4 with Hierarchical Microstructures and High Vis–NIR Light Photoactivity

“…After the mixture was heated at 180 °C for 12 h, white powders were precipitated from the solution. When the intermediate was sintered at 500 °C, a tri- s -triazine structure (double peaks at 13.0° and 27.1°) was formed. , The GCN sample is slightly yellow, while PCN- x ( x is the volume (mL) of phosphoric acid (85%) added into the reactant solution (60 mL in total) in the solvothermal step) is distinctively black.…”

Emerging tri‐s‐triazine‐based graphitic carbon nitride: A potential signal‐transducing nanostructured material for sensor applications

“…also prepared a porous carbon/g‐C 3 N 4 nanocomposite capable of the photocatalytic degradation of MB according to the mechanism shown in Figure 5F. [ 80 ] This study offers a robust method to prepare carbon‐g‐C 3 N 4 hybrid materials for environmental applications.…”

In‐situ synthesis of defects modified mesoporous g‐C 3 N 4 with enhanced photocatalytic H 2 evolution performance

“…Except TiO 2 , other photocatalysts, such as CdS, 11,12 ZnS, 13 WO 3 14,15 , Bi 12 O 17 Cl 2 , 16,17 etc, were also developed. In 2009, a new organic semiconductor, graphitic carbon nitrogen (g‐C 3 N 4 ), was discovered to possess photocatalytic ability for producing H 2 by Wang et al 18 g‐C 3 N 4 had some advantages, including low‐cost, easy preparation, and good stability, which resulted in g‐C 3 N 4 to be widely developed in photocatalysis field, for example, photocatalysis pollutants degradation, 19‐21 H 2 evolution, 22‐26 nitrogen fixation, 27 H 2 O 2 production, 28 etc. Whereas, the photocatalytic performance of untreated g‐C 3 N 4 was not desired owing to low specific surface area, slow efficient separation of photoexcited electrons, and common visible‐light response property.…”