Two-dimensional ultrathin nanosheet graphite phase carbon nitride material rich in nanopores, and preparation method and applications thereof

Abstract

The invention discloses a two-dimensional ultrathin nanosheet graphite phase carbon nitride material rich in nanopores, and a preparation method and applications thereof, and belongs to the technicalfield of nanometer functional material preparation, solar energy utilization, and environment protection. The two-dimensional ultrathin nanosheet graphite phase carbon nitride material rich in nanopores is prepared through oriented thermal polymerization combined two-step thermal processing technology; more specifically, a liquid phase template agent is adopted to control the thickness of a nanosheet g-C3N4 material, two-step thermal processing technology parameter design is adopted for forming of nanopores on nanosheets; the forming of the nanopores is capable of introducing more active sites, so that the nanosheet g-C3N4 material obtained at last possesses appropriate light absorption characteristic, and relatively high photo-induced electron and cavity separation efficiency, a defect ofblock-shaped g-C3N4 material that photocatalytic efficiency is low is improved, and the two-dimensional ultrathin nanosheet graphite phase carbon nitride material rich in nanopores can be directly used for organic matter decomposition, microbial pathogen inactivation, and photocatalytic reduction CO2 to produce organic matters under sunlight.

Description

Technical field [0001] The invention relates to the technical field of functional nanomaterial preparation, solar energy utilization and environmental protection, and in particular to a two-dimensional ultra-thin nanosheet g-C rich in nanopores 3 N 4 Materials and their preparation methods and applications. Background technique [0002] In the past few decades, photocatalytic technology has received widespread attention due to its huge potential in solving the global energy crisis and environmental pollution. At present, most photocatalytic material systems are still focused on traditional inorganic transition metal oxide semiconductors, especially the modification of traditional inorganic semiconductor photocatalytic materials (such as metal and non-metal doping, metal particle deposition and construction of heterojunctions, etc. ) And the exploration of new semiconductor photocatalytic materials. [0003] In recent years, a new type of non-metal organic polymer semiconductor g-C...

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Problems solved by technology

[0005] The object of the present invention is to provide a nanopore-rich two-dimensional ultra-thin nanosheet graphitic carbon nitride material and its preparation method and application. The nanopore-rich two-dimensional ultrathin nanosheet g-C 3 N 4 The material is prepared by a process of directed thermal polymerization combined with two-step heat treatment. Specifically, the g-C of nanosheets is controlled by a liquid-phase template agent. 3 N 4 The thickness of the material, and then through the design of the two-step heat treatment process parameters to create nanopores on the nanosheets, the existence of nanopores can introduce more activity, so that the final nanosheet g-C 3 N 4 The material not only has suitable light absorption properties, but also has high separation efficiency of photogenerated electrons and holes, improving the bulk g-C 3 N 4 Due to the low photocatalytic efficiency of the material, it can be directly applied to the decomposition of organic matter under sunlight, the inactivation of microbial pathogens and the photocatalytic reduction of CO 2 organic fuel

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