摘要石墨相氮化碳( g-C3N4)是一种典型的非金属半导体材料。由于其电子结构独特、对可见光响应、物理化学性质稳定、成本低廉，同时还具有无毒、来源丰富、制备成型工艺简单等特点， g-C3N4已成为备受关注的一种新型半导体光催化材料。本论文对不同原料，不同方法制备的 g-C3N4的性质和结构进行了探究，具体内容如下：

    (1)选取制备 g-C3N4常用原料尿素、三聚氰胺、二氰二胺中两种按一定比例（1:0，1:2，1:1，2:1，0:1）在一定温度下混合煅烧，得到的煅烧产物再进行二次焙烧，得到片层少，结构完整的g-C3N4纳米片。通过光催化降解罗丹明B实验表明，二次焙烧制得的g-C3N4纳米片具有更加优异的可见光催化活性；

    (2)采用软化学方法在 g-C3N4的二维表面上负载Ag2CO3纳米颗粒，并通过XRD，TEM，Raman等手段对复合材料进行结构和形貌的表征。光催化实验结果表明，与单一g-C3N4和Ag2CO3相比，复合材料具有更好的光催化活性，主要归因于二者之间的协同作用，有助于光生载流子的有效分离。79339

毕业论文关键词  g-C3N4；Ag2CO3；染料降解；光催化

毕业设计说明书外文摘要

Title  Synthesis and photocatalytic properties study of graphitic carbon nitride nanomaterial                       

Abstract As a typical metal-free semiconductor, graphitic carbon nitride (g-C3N4) has attracted considerable attention owing to its unique electronic and optical properties, exceptional physical and chemical properties, low cost and simple process。 This dissertation is based on the different materials and methods to design g-C3N4 with high performance under visible light irradiation。 The main contributions of this dissertation are described as follows:

(1) The g-C3N4 nanosheets with less layers and structural integrity were prepared by a mixture of both of the urea, melamine, cyanide diamine with a certain proportion after the second calcination。 The results show that the as-obtained g-C3N4 reveals excellent photocatalytic activity for degradation of Rhodamine B under visible light irradiation。

(2) Ag2CO3 nanoparticles were homogeneously anchored on the surface of g-C3N4 nanosheets by a facile one-step chemical deposition method and characterized by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy and transmission electron microscopy techniques。 In comparison with the pure Ag2CO3 and g-C3N4 catalyst, the Ag2CO3/g-C3N4 nanocomposite reveals much higher photocatalytic activity due to the concerted effects of Ag2CO3 and g-C3N4, which made the recombination of photogenerated electrons and holes inhibited greatly。

Keywords  g-C3N4; Ag2CO3; dye degradation; photocatalysis

目   录

1  绪论 1

1。1半导体光催化剂概述 1

1。1。1半导体光催化原理 1

1。1。2 光催化性能的主要影响因素 3

1。2类石墨相氮化碳（g-C3N4）概述 4

1。2。1 g-C3N4的发展历史 4

1。2。2 g-C3N4的结构 4

1。2。3 g-C3N4的制备方法 5

1。3 g-C3N4在能源以及环境领域的应用 6

1。4 本课题的选题依据及研究内容 7

1。4。1 选题依据 7

1。4。2 主要研究内容 8