BiVO<sub>4</sub>/rGO涂膜电极光电催化测定水样中的COD

何卓容; 李贤英; 魏贝贝

doi:10.13205/j.hjgc.202302027

BiVO₄/rGO涂膜电极光电催化测定水样中的COD

doi: 10.13205/j.hjgc.202302027

东华大学环境科学与工程学院, 上海 201620

详细信息

作者简介:
何卓容(1997-),女,硕士研究生,主要研究方向为功能性环境纳米材料。hzrbyoct@163.com

通讯作者:
李贤英(1970-),女,博士,副教授,主要研究方向为功能性环境纳米材料及基于有机分子自组装的超分子化学。seanlee@dhu.edu.cn

计量
- 文章访问数: 42
- HTML全文浏览量: 8
- PDF下载量: 4
- 被引次数: 0
出版历程
- 收稿日期: 2021-12-07
- 网络出版日期: 2023-05-25
- 刊出日期: 2023-02-01

DETERMINATION OF COD IN WATER SAMPLES BY BiVO₄/rGO BASED ON PHOTOELECTROCHEMICAL DETERMINATION

College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China

摘要

摘要: 准确、及时且环境友好地检测水体的化学需氧量(COD)已成为环境监测领域的重要研究课题。采用溶液燃烧法和旋转涂膜法制备了一种可见光响应型BiVO₄/rGO涂膜电极用于COD测定,并考察了该电极用于COD检测的光电化学性能。利用X-射线衍射(XRD)、扫描电子显微镜(SEM)、比表面积分析(BET)探究复合电极结构,表明基底完全被BiVO₄/rGO覆盖。采用循环伏安法(CV)、光电流-时间法(I-t)测试其光电性能,确定最佳制备条件为:煅烧温度为500℃、掺杂rGO为5 mL、涂膜厚度为4层。通过考察其测试参数得出,在工作电压为1.0 V、支持电解质为0.1 mol/L Na₂SO₄、光照强度为400 μW/cm²、pH为6~8可得到稳定可靠的测试结果。利用BiVO₄/rGO涂膜电极测定有机物溶液COD的测定范围为12.18~719.8 mg/L,转移净电荷量(Q_net)和理论COD间呈良好的线性关系。用于实际水样COD测定时,在60 s内可达稳态光电流,测定结果与国标法测定COD结果具有良好的一致性,相对偏差均<5%。因此BiVO₄/rGO涂膜电极具有响应速度快、线性范围宽、操作便捷等优点,可替代传统COD测定仪器。
- 光电催化反应 /
- BiVO₄/rGO涂膜电极 /
- 化学需氧量(COD) /
- 净电荷量 /
- 水处理
Abstract: Accurate, timely and environmentally friendly detection of water Chemical oxygen demand has become an important research topic in the field of environmental monitoring. A visible-light-responsive BiVO₄/rGO film electrode was prepared by solution combustion method and rotating coating method for the determination of COD. The structure of the composite electrode was investigated by X-ray diffraction (XRD), surface area analysis(BET) and scanning electron microscope analysis(SEM). The results showed that the substrate was completely covered by BiVO₄/rGO. The photoelectric properties were tested by cyclic voltammetry(CV), photocurrent-time (I-t) method, and the best performance was obtained when the calcination temperature was 500℃, the doped rGO was 5 mL, and the coating thickness was 4 layers. The results showed that stable and reliable test results could be obtained in the condition of a working voltage of 1.0 V, supporting electrolyte of 0.1 mol/L Na₂SO₄, illumination intensity of 400 μW/cm² and pH of 6~8. The determination range of COD by BiVO₄/rGO film electrode was 12.18~719.8 mg/L, and there was a good linear relationship between the transfer net charge (Q_net) and the theoretical COD value. When it was applied to the determination of COD in real water samples, the steady photocurrent could be reached within 60 seconds. The results were in good agreement with the national standard method, and the relative deviation was less than 5%. Therefore, BiVO₄/rGO coated electrode has the advantages of fast response, wide linear range and convenient operation, which can replace the traditional COD determination instrument.
- photoelectrocatalytic reaction /
- BiVO₄/rGO coating electrode /
- chemical oxygen demand (COD) /
- net charge /
- water treatment

HTML全文

参考文献(25)

[1]	KANG Z F, HE Z X, WEN Y Z, et al. Smart COD sensor using UV-Vis spectroscopy against optical window surface contamination[J]. Measurement, 2022, 187:110125.
[2]	LI J W, TONG Y F, GUAN L, et al. A turbidity compensation method for COD measurements by UV-vis spectroscopy[J]. Optik, 2019, 186:129-136.
[3]	ZHOU B, BAI J, LI J. Applying nanophotoelectrocatalytic oxidation of organic pollutants to COD sensing[J]. Science, 2016, 1223:30-31.
[4]	MAHESKUMAR V, JIANG Z, LIN Y, et al. The structural and optical properties of Ag/Cu co-doped BiVO4 material:a density functional study[J]. Materials Letters, 2022, 315:131289.
[5]	LI Y P, SUN X L, TANG Y M, et al. Understanding photoelectrocatalytic degradation of tetracycline over three-dimensional coral-like ZnO/BiVO₄ nanocomposite[J]. Materials Chemistry and Physics, 2021, 271:254-584.
[6]	CHEN Z H, MI N, HUANG L Q, et al. Snow-like BiVO₄ with rich oxygen defects for efficient visible light photocatalytic degradation of ciprofloxacin[J]. Science of the Total Environment, 2022, 808:152083.
[7]	SAMSUDIN M F R, SUFIAN S. Hybrid 2D/3D g-C₃N₄/BiVO₄ photocatalyst decorated with RGO for boosted photoelectrocatalytic hydrogen production from natural lake water and photocatalytic degradation of antibiotics[J]. Journal of Molecular Liquids, 2020, 314:113530.
[8]	冯艳, 王济奎, 张宝剑, 等. 基于氧化石墨烯-纳米镍修饰电极的化学耗氧量即时检测系统[J]. 分析化学, 2018, 46(7):1055-1061.
[9]	OUYANG K, YANG C, XU B Q, et al. Synthesis of novel ternary Ag/BiVO₄/GO photocatalyst for degradation of oxytetracycline hydrochloride under visible light[J]. Colloids and Surfaces A:Physicochemical and Engineering Aspects, 2021, 625:126978.
[10]	MORAL R A I, QUINTANA M, LEYVA R R, et al. Novel and green synthesis of BiVO₄ and GO/BiVO₄ photocatalysts for efficient dyes degradation under blue LED illumination[J]. Ceramics International, 2022, 48(1):1264-1276.
[11]	WANG J Q, YAO N, LI M, et al. Electrochemical tuning of the activity and structure of a copper-cobalt micro-nano film on a gold electrode, and its application to the determination of glucose and of chemical oxygen demand[J]. Microchimica Acta, 2015, 182:515-522.
[12]	KANGKUN N, PONCHIO C. Photoelectrodeposition of BiVO₄ layer on FTO/WO₃ photoanodes for highly efficient photoelectrocatalytic chemical oxygen demand sensor applications[J]. Applied Surface Science, 2020, 526:146686.
[13]	NAGABHUSHANA G P, TAVAKOLI A H, NAVROTSKY A. Energetics of bismuth vanadate[J]. Journal of Solid State Chemistry, 2015, 225:187-192.
[14]	李晓娜. BiVO₄材料的改性及其光催化效能研究[J]. 分子科学学报, 2019, 35(3):242-247.
[15]	陈擘威,黄华康,毕于铁,等. 锌基复合气凝胶的制备与表征[J]. 精细化工,2015,32(5):487-490.
[16]	QIU Y C, LIU W, CHEN W, et al. Efficient solar-driven water splitting by nanocone BiVO₄-perovskite tandem cells[J]. Science Advances, 2016, 2:1501764.
[17]	杨喆, 何利华, 张丙青. 基于钒酸铋半导体材料的光电化学葡萄糖传感器的研究[J]. 分析测试技术与仪器, 2021, 27(3):158-164.
[18]	HE Z T, LIU S, ZHONG Y, et al. Preparation of BiPO4/graphene photoelectrode and its photoelectrocatalyitic performance[J]. Chinese Journal of Catalysis,2020,41(2):302-311.
[19]	SILVA M R, LUCILHA A C, AFONSO R, et al. Photoelectrochemical properties of FTO/m-BiVO₄ electrode in different electrolytes solutions under visible light irradiation[J]. Ionics, 2014, 20(1):105-113.
[20]	CAO D W, LI M, ZHU J F, et al. Enhancement of photoelectrochemical performance in ferroelectric films via the introduction of an Au buffer layer[J]. Journal of Semiconductors, 2021, 42(11):65-73.
[21]	LIU G Q, LI Y, YANG Y, et al. Anti-photocorrosive photoanode with RGO/PdS as hole extraction layer[J]. Science China Materials,2020,63(10):1939-1947.
[22]	欧盼盼, 韦富存, 吴叶宇, 等. 基于多孔二氧化钛-硒化镉量子点复合材料的光电化学传感器用于检测Hg²⁺[J]. 分析化学, 2021, 49(11):1897-1907.
[23]	SAITO R, MISEKI Y, SAYAMA K. Photoanode characteristics of multi-layer composite BiVO₄ thin film in a concentrated carbonate electrolyte solution for water splitting[J]. Journal of Photo-chemistry and Photobiology A:Chemistry, 2013, 258:51-60.
[24]	ZHANG S Q, ZHAO H J, JIANG D L, et al. Photoelectrochemical determination of chemical oxygen demand based on an exhaustive degradation model in a thin-layer cell[J]. Analytica Chimica Acta, 2004, 514:89-97.
[25]	环境保护部.水质化学需氧量的测定重铬酸盐法:GB 11914-1989[S]. 北京:中国环境出版社,1989.