A kind of preparation method of surface-modified g-c3n4

Abstract

The invention belongs to the field of materials and catalysis and relates to a surface-modified g-C 3 N 4 preparation method. For the first time, sodium halide, potassium halide or mixtures of these salts were creatively combined with g‑C 3 N 4 Carry out high-temperature reaction, and introduce water during the reaction process, so that the modified g‑C 3 N 4 Contains hydroxyl groups and in modified g‑C 3 N 4 Surface modification with corresponding metal ions. This method is not only simple to operate, easy to implement, cheap and easy to obtain reaction raw materials, environmentally friendly, and modified g‑C 3 N 4 It has the characteristics of high yield and modified g-C 3 N 4 The abundant hydroxyl groups and rich pore structure on the surface can generate abundant hydroxyl radicals under visible light. These characteristics are modified g‑C 3 N 4 It has laid the foundation for practical applications in the field of photocatalysis.

Description

technical field [0001] The invention belongs to the field of material and catalysis science, in particular to a surface-modified g-C 3 N 4 method of preparation. The method is through a simple high-temperature reaction method, in g-C 3 N 4 Hydroxyl groups are formed on the surface of the material and loaded with metal ions. This method is implemented for the first time. Through this method, large quantities of surface-modified g-C can be rapidly and batch-prepared 3 N 4 , has broad prospects in the fields of solar cells, heterogeneous catalysis, and degradation of organic matter. Background technique [0002] g-C 3 N 4 (Graphitic Carbon Nitride, abbreviated as g-C 3 N 4 ) is an organic semiconductor material with a graphite-like structure. Since it was discovered in 2009 that it has photocatalytic hydrogen evolution activity, it has been extensively studied due to its stable physical and chemical stability, small band gap (2.7eV), and easy preparation method. Ho...

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Problems solved by technology

However, since g-C prepared by the traditional one-pot method 3 N 4 The shortcomings of small specific surface area, narrow visible light absorption range, and low catalytic activity limit its application in the field of catalysis, so people have carried out a lot of research on its modification, including morphology design, metal ion doping, and organic molecule copolymerization. , Construction of semiconductor heterojunctions, etc., have made some progress

However, since g-C 3 N 4 High physical and chemical stability, but there are few studies on its surface modification, and the abundant amine defect groups on its surface can provide the possibility for modification research

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