Mechanistic insight into photochemical and photoelectrochemical degradation of organic pollutants with the use of BiVO4 and BiVO4/Co-Pi

被引:21
作者
Lecki, Tomasz [1 ,2 ]
Hamad, Hesham [1 ,3 ]
Zarebska, Kamila [1 ,2 ]
Wierzynska, Ewelina [1 ]
Skompska, Magdalena [1 ,2 ]
机构
[1] Univ Warsaw, Fac Chem, Lab Electrochem, Pasteur 1, PL-02093 Warsaw, Poland
[2] Univ Warsaw, Fac Chem, Biol & Chem Res Ctr, Zwirki & Wigury 101, PL-02089 Warsaw, Poland
[3] City Sci Res & Technol Applicat SRTA City, Adv Technol & New Mat Res Inst ATNMRI, Fabricat Technol Res Dept, New Borg El Arab City 21934, Alexandria, Egypt
关键词
BiVO4; Photocatalysis; Photoelectrocatalysis; Caffeine photodegradation; Co-Pi; Flat band potential; Mott-Schottky plot; FLAT-BAND POTENTIALS; THIN-FILM ELECTRODES; VISIBLE-LIGHT; OXYGEN EVOLUTION; WATER OXIDATION; PHOTOCATALYTIC PERFORMANCE; BISMUTH VANADATE; COBALT-PHOSPHATE; CHARGE SEPARATION; SEMICONDUCTOR;
D O I
10.1016/j.electacta.2022.141292
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
In this work we clarify the role of hydroxyl radicals (center dot OH), superoxide anion radicals (O-2(center dot-)) and the holes in photocatalytic and photoelectrocatalytic degradation of organic pollutants on BiVO4, and critically discuss different mechanisms of the process reported in the literature. The generation of O-2(center dot-) anion radicals was monitored by the reaction with Nitro Blue Tetrazolium chloride (NBT), while the formation of center dot OH was controlled by transformation of terephthalic acid into fluorescent 2-hydroxyterephtalic acid. The band diagram of BiVO4 was constructed on the base of the E-fb determined from the measurements of open circuit potential (OCP) and photocurrent onset potential, and the mechanism of photodegradation of caffeine (CAF) on BiVO4 was proposed. It was shown that the photodegradation rate constant of CAF may be increased from 2.1.10(-3) to 4.610(-3) min(-1) by modification of BiVO4 surface with cobalt phosphate (Co-Pi) co-catalyst. The presence of Co-Pi resulted in the increase of the electron life-time and suppression of the electron-hole recombination in BiVO4. The 26-fold increase of the degradation rate constant, to the value 5.5.10(-2) min(-1), was achieved by application of an external potential of 0.6 V vs Ag/AgCl to the BiVO4 electrode and the mechanism of photoelectrocatalytic process was proposed.
引用
收藏
页数:12
相关论文
共 83 条
[21]   Flat band potential determination: avoiding the pitfalls [J].
Hankin, Anna ;
Bedoya-Lora, Franky E. ;
Alexander, John C. ;
Regoutz, Anna ;
Kelsall, Geoff H. .
JOURNAL OF MATERIALS CHEMISTRY A, 2019, 7 (45) :26162-26176
[22]   Photocatalytic BiVO4 Microswimmers with Bimodal Swimming Strategies [J].
Heckel, Sandra ;
Simmchen, Juliane .
ADVANCED INTELLIGENT SYSTEMS, 2019, 1 (08)
[23]   Properties of O2•- and OH• formed in TiO2 aqueous suspensions by photocatalytic reaction and the influence of H2O2 and some ions [J].
Hirakawa, T ;
Nosaka, Y .
LANGMUIR, 2002, 18 (08) :3247-3254
[24]   Self-assembly synthesis of BiVO4/Polydopamine/g-C3N4 with enhanced visible light photocatalytic performance [J].
Huo, Rui ;
Yang, Xue-Ling ;
Yang, Jing-Yu ;
Yang, Si-Yuan ;
Xu, Yue-Hua .
MATERIALS RESEARCH BULLETIN, 2018, 98 :225-230
[25]   Oxysulfide Sm2Ti2S2O5 as a stable photocatalyst for water oxidation and reduction under visible light irradiation (λ ≤ 650 nm) [J].
Ishikawa, A ;
Takata, T ;
Kondo, JN ;
Hara, M ;
Kobayashi, H ;
Domen, K .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2002, 124 (45) :13547-13553
[26]   Porous F-doped BiVO4: Synthesis and enhanced photocatalytic performance for the degradation of phenol under visible-light illumination [J].
Jiang, Haiyan ;
Dai, Hongxing ;
Deng, Jiguang ;
Liu, Yuxi ;
Zhang, Lei ;
Ji, Kemeng .
SOLID STATE SCIENCES, 2013, 17 :21-27
[27]   In situ formation of an oxygen-evolving catalyst in neutral water containing phosphate and Co2+ [J].
Kanan, Matthew W. ;
Nocera, Daniel G. .
SCIENCE, 2008, 321 (5892) :1072-1075
[28]   Cobalt-phosphate oxygen-evolving compound [J].
Kanan, Matthew W. ;
Surendranath, Yogesh ;
Nocera, Daniel G. .
CHEMICAL SOCIETY REVIEWS, 2009, 38 (01) :109-114
[29]   FLATBAND POTENTIALS AND DONOR DENSITIES OF POLYCRYSTALLINE ALPHA-FE2O3 DETERMINED FROM MOTT-SCHOTTKY PLOTS [J].
KENNEDY, JH ;
FRESE, KW .
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1978, 125 (05) :723-726
[30]   Nanoporous BiVO4 Photoanodes with Dual-Layer Oxygen Evolution Catalysts for Solar Water Splitting [J].
Kim, Tae Woo ;
Choi, Kyoung-Shin .
SCIENCE, 2014, 343 (6174) :990-994