| 超分子前体制备g-C3N4/g-C3N4同质结及光催化性能研究 |
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| 引用本文： | 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. |
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| 作者姓名： | 班昌胜 李军 金央 陈明 左龙涛 |
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| 作者单位： | 四川大学化学工程学院,四川成都 610065 |
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| 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。
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| 关 键 词： | 石墨相氮化碳 超分子 同质结 光催化 |
| 收稿时间： | 2021-05-20 |
Study on preparation of g-C3N4/g-C3N4 homojunction by supramolecular precursor and its photocatalytic property |
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| 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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| Authors: | BAN Changsheng LI Jun JIN Yang CHEN Ming ZUO Longtao |
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| Affiliation: | School of Chemical Engineering,Sichuan University,Chengdu 610065,China |
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| 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. |
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| Keywords: | g-C3N4 supramolecular homojunctions photocatalysis |
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