超分子前体制备g-C3N4/g-C3N4同质结及光催化性能研究

doi:10.19964/j.issn.1006-4990.2021-0260

摘要/Abstract

摘要：

通过混合煅烧二氰二胺水热法和三聚氰胺-三聚氰酸共沉淀法制备的超分子前驱体,制备了兼具多孔纳米片和中空纳米管形貌的g-C₃N₄/g-C₃N₄同质结（CN-HP）。通过X射线衍射（XRD）、扫描电镜（SEM）、透射电镜（TEM）、紫外-可见漫反射光谱（UV-Vis DRS）、光致发光光谱（PL）等对光催化剂进行了表征。结果表明,CN-HP-1/1在75 min内对亚甲基蓝（MB）的降解率可达99.8%,伪一级动力学常数为4.02 h^-1,是块体g-C₃N₄的5倍,同时单位比表面积的反应常数提升至单体的1.8倍。PL测试表明,合适比例的三聚氰胺-三聚氰酸（MCA-H、MCA-P）超分子制备的同质结,其光生电子-空穴复合率较单体g-C₃N₄进一步降低。自由基捕获实验表明,光生空穴是光催化降解过程中的主要活性物种,并结合X射线光电子能谱价带谱测试提出了Z型电子传输机制。

关键词: 石墨相氮化碳, 超分子, 同质结, 光催化

Abstract:

g-C₃N₄/g-C₃N₄ homojunction（CN-HP） with the morphology of porous nanosheets and hollow nanotubes was pre-pared from supramolecular precursor prepared by mixed calcination of dicyanodiamine hydrothermal method and melamine-cyanuric acid coprecipitation method.The photocatalyst was characterized by X-ray diffraction（XRD）,scanning electron mi-croscopy（SEM）,transmission electron microscopy（TEM）,ultraviolet-visible diffuse reflectance（UV-Vis DRS）,photolumi-nescence spectroscopy（PL）,etc.The results showed that CN-HP-1/1 exhibited a degradation rate of 99.8% for methylene blue（MB） within 75 min,and the pseudo first-order kinetic constant was 4.02 h^-1,which was 5 times that of bulk g-C₃N₄.And the reaction constant per unit specific surface area was increased to 1.8 times that of monomeric g-C₃N₄.The PL test showed that the photogenerated electron-hole recombination rate of the homojunction prepared by the appropriate ratio of MCA was lower than that of the monomer g-C₃N₄. Free radical capture experiments showed that photo-generated holes were the main active species in the photocatalytic degradation process.Combined with XPS valence band spectroscopy tests,it was proposed that the homojunction photocatalysts had a Z-scheme electron transport mechanism.

Key words: g-C₃N₄, supramolecular, homojunctions, photocatalysis

中图分类号:

O644.1

班昌胜,李军,金央,陈明,左龙涛. 超分子前体制备g-C₃N₄/g-C₃N₄同质结及光催化性能研究[J]. 无机盐工业, 2022, 54(3): 125-131.

BAN Changsheng,LI Jun,JIN Yang,CHEN Ming,ZUO Longtao. Study on preparation of g-C₃N₄/g-C₃N₄ homojunction by supramolecular precursor and its photocatalytic property[J]. Inorganic Chemicals Industry, 2022, 54(3): 125-131.

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光催化剂	比表面积/ （m²·g^-1）	平均孔径/ nm	孔容/ （cm³·g^-1）
BCN	8.8	32.5	0.042
CN-H	52.6	14.5	0.193
CN-HP-3/1	40.4	18.3	0.158
CN-HP-1/1	47.8	17.5	0.174
CN-HP-1/3	49.6	17.1	0.186
CN-P	56.7	16.5	0.202

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超分子前体制备g-C₃N₄/g-C₃N₄同质结及光催化性能研究

Study on preparation of g-C₃N₄/g-C₃N₄ homojunction by supramolecular precursor and its photocatalytic property

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