超声共混合成Ni(HNCN)2/BiVO4复合可见光催化剂

doi:10.11900/0412.1961.2020.00062

金属学报

2020, Vol. 56

Issue (11): 1551-1557 DOI: 10.11900/0412.1961.2020.00062

本期目录 | 过刊浏览

超声共混合成Ni(HNCN)₂/BiVO₄复合可见光催化剂

张霞(

), 宋扬, 王誉, 纪逯鹤, 杨媚, 孟皓

东北大学理学院化学系沈阳 110819

Ultrasonic Blending Synthesis of Ni(HNCN)₂/BiVO₄ Composite Visible-Light Induced Photocatalysts

ZHANG Xia(

), SONG Yang, WANG Yu, JI Luhe, YANG Mei, MENG Hao

Faculty of Chemistry, College of Sciences, Northeastern University, Shenyang 110819, China

引用本文:

张霞, 宋扬, 王誉, 纪逯鹤, 杨媚, 孟皓. 超声共混合成Ni(HNCN)₂/BiVO₄复合可见光催化剂[J]. 金属学报, 2020, 56(11): 1551-1557.
Xia ZHANG, Yang SONG, Yu WANG, Luhe JI, Mei YANG, Hao MENG. Ultrasonic Blending Synthesis of Ni(HNCN)₂/BiVO₄ Composite Visible-Light Induced Photocatalysts[J]. Acta Metall Sin, 2020, 56(11): 1551-1557.

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摘要:

采用化学沉淀法分别合成了Ni(HNCN)₂和BiVO₄，然后通过超声共混制备了Ni(HNCN)₂/BiVO₄复合颗粒，利用XRD、SEM、红外光谱(FT-IR)和紫外-可见(UV-Vis)吸收光谱对复合光催化剂的结构进行表征，并研究其对于有机染料罗丹明B的可见光催化降解。结果表明，超声共混获得较小颗粒尺寸的Ni(HNCN)₂沉积在棒状BiVO₄表面形成异质结构。单一Ni(HNCN)₂的禁带宽度为2.64 eV，BiVO₄的禁带宽度为2.41 eV，Ni(HNCN)₂/BiVO₄复合颗粒的禁带宽度约为2.37 eV。相较于单一Ni(HNCN)₂和BiVO₄颗粒，复合颗粒禁带宽度变窄，更有利于对可见光的响应。在对罗丹明B的光催化降解过程中，Ni(HNCN)₂与BiVO₄按照摩尔比例1∶2合成的复合颗粒的光催化活性最强。光催化机理研究表明，匹配的能带结构促进光生电子和空穴在两相界面的流动，提高光催化效率。

关键词 ：超声共混合成, 可见光催化, 单氰胺镍, 钒酸铋

Abstract：

Photocatalytic technology is gaining increasing attention as one of the key technologies in solving environmental pollution problems owing to its ability to completely decompose organic contaminants. In addition, the development of visible-light-driven photocatalysts has always been an important topic in photocatalytic fields. In this work, Ni(HNCN)₂ and BiVO₄were synthesized using a simple chemical precipitation process, which was followed by the preparation of Ni(HNCN)₂-BiVO₄ composite particles using a simple ultrasonic blending method. The structure of the resulting composite photocatalysts was characterized via XRD, SEM, FT-IR, and UV-Vis spectra, and its photocatalytic activities in the degradation of Rhodamine B were tested. The experimental results revealed that the smaller Ni(HNCN)₂ particles produced via ultrasonic treatment were deposited on the surface of BiVO₄to form a heterostructure. The bandgap of single Ni(HNCN)₂, BiVO₄, and Ni(HNCN)₂-BiVO₄ are 2.64, 2.41, and 2.37 eV, respectively. Compared to the single Ni(HNCN)₂ and BiVO₄particles, there was improved sensitivity to visible light in Ni(HNCN)₂-BiVO₄ composites due to the narrower bandgap of the composite particles. During the photocatalytic degradation of Rhodamine B, the composite particles synthesized with 1∶2 mole ratio of Ni(HNCN)₂ and BiVO₄ demonstrated the best visible-light photocatalytic activity. The mechanism of the photocatalysis suggested that the matched band structure promotes the flow of the photogenerated electrons and holes at the interface, thereby improve the photocatalytic efficiency.

Key words： ultrasonic blending synthesis visible-light induced photocatalysis nickel cyanamide bismuth vanadate

收稿日期: 2020-02-25

ZTFLH:

TQ13

基金资助:国家自然科学基金项目(21501023);国家级大学生创新创业训练计划项目(201910145033);中央高校基本科研业务专项资金项目(N182410001)

作者简介: 张霞，女，1971年生，博士，教授

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https://www.ams.org.cn/CN/10.11900/0412.1961.2020.00062 或 https://www.ams.org.cn/CN/Y2020/V56/I11/1551

图1 Ni(HNCN)2、BiVO4 和Ni(HNCN)2/BiVO4复合颗粒的SEM像和EDS分析

图2 Ni(HNCN)2、BiVO4和Ni(HNCN)2/BiVO4复合颗粒的XRD谱和FT-IR谱

图3 Ni(HNCN)2/BiVO4复合颗粒的UV-Vis光谱和(Ahν)2随 (hν)变化曲线

图4 Ni(HNCN)2/BiVO4复合颗粒对罗丹明B的降解曲线

图5 Ni(HNCN)2和BiVO4颗粒的Mott-Schottky曲线

图6 Ni(HNCN)2/BiVO4复合颗粒的能带结构示意图

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[1]	荣凤鸣, 王誉, 张霞. 基于氰胺锌的复合光催化剂的结构与可见光催化性能[J]. 金属学报, 2018, 54(1): 76-82.

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