Development of g-C 3 N 4 /BiVO 4 Binary Component Heterojunction as an Advanced Visible Light-Responded Photocatalyst fo
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ORIGINAL PAPER
Development of g-C3N4/BiVO4 Binary Component Heterojunction as an Advanced Visible Light-Responded Photocatalyst for Polluted Antibiotics Degradation Nguyen Le Minh Tri3,4 · Nguyen Thi Dieu Cam2 · Hai Dinh Pham1 · Doan Van Thuan5,6 · Thanh‑Dong Pham7,8 · Van Tang Nguyen9 · Nguyen Tien Trung2 · Mai Hung Thanh Tung10 · Tran Thi Thu Phuong2 · Thi Thu Phuong Nguyen11 · Cao Van Hoang2 · Van Duong Dao12
© Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract g-C3N4/BiVO4, binary component heterojunction materials, were successfully synthesized for novel photocatalytic tetracycline (TC) decomposition. In the prepared binary component heterojunction, B iVO4 was well distributed on g-C3N4 layer. In addition, BiVO4 and g-C3N4 was intimately contacted. Both BiVO4 and g-C3N4, which band gap energies were approximately 2.46 and 2.71 eV, respectively, would also absorb significant amount of visible light to excite electrons (e−) from their valence bands to conduction bands. Thus, the e − on the conduction band of the B iVO4 could quickly transfer and combine with + the h on the valence band of the g-C3N4. Therefore, the g-C3N4/BiVO4 could be easily excited by incident visible irradiation to produce large number of h+ on the valence band of the BiVO4 and e− on the conduction band of the g-C3N4. These produced e− and h+ were strong enough for reactions with water and oxygen to product huge amounts of hydroxyl radicals for novel TC degradation. The photocatalytic performance of these g-C3N4/BiVO4 materials highly depended on weight ratio of these used precursors. The g-C3N4/BiVO4-10 material, which the g-C3N4:BiVO4 weight ratio was 10%, presented the highest tetracycline degradation efficiency (95%). This was due to these excess of g-C3N4 covered more BiVO4 surface preventing incident light reaching to the material and also represented as active sites for recombination of charges (e− and h+) decreasing photocatalytic efficiency of the system. Finally, the synthesized g-C 3N4/BiVO4 presented novel durability during long-term photocatalysis. Keywords BiVO4 · g-C3N4 · Binary component heterojunctions · Tetracycline removal · Photocatalytic degradation
1 Introduction Uses of photocatalysts for degradation of organic pollutants has recently become an advanced technology for wastewater purification [1–3]. Numerous photocatalysts, including T iO2, ZnO, AgI, B iVO4, g-C3N4, FeVO4, Ta3N5, Ag3VO4, NiWO4, Ag3PO4 and W O3, have been successfully developed for Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11244-020-01368-y) contains supplementary material, which is available to authorized users. * Nguyen Thi Dieu Cam [email protected] * Thanh‑Dong Pham [email protected] Extended author information available on the last page of the article
degradation of many organic contaminants [4–6]. Nevertheless, wide energy band-gap ( Ebg ≥ 3.0 eV) and/or quick recombination of photo-induced h+ and e− have been considered
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