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Heterojunction catalysts g-C 3 N 4 /-3ZnO-c-Zn 2 Ti 3 O 8 with highly enhanced visible-light-driven photocatalytic activity
Journal of Sol-Gel Science and Technology ( IF 2.5 ) Pub Date : 2019-09-17 , DOI: 10.1007/s10971-019-05101-4
Nelvi Sutanto , Khairul Arifah Saharudin , Srimala Sreekantan , Vignesh Kumaravel , Hazizan Md Akil

Abstract

In this study, pristine ZnO, TiO2, hexagonal-ZnTiO3, and cubic-Zn2Ti3O8 nanoparticles were synthesized by varying the molar ratio of ZnO/TiO2 by sol–gel method assisted with calcinations at 500 °C for 2 h in air. Compared with the pristine phase of zincite (ZnO) and anatase/rutile (TiO2), hybrid nanostructures with 3ZnO:1TiO2 (3ZT) that retain zincite and c-Zn2Ti3O8 demonstrated a higher photocatalytic activity (~82% degradation within 45 min). 3ZT photocatalyst that has been loaded with 10 wt% g-C3N4 has further enhanced visible-light photocatalytic activity performance up to ~99% degradation within 45 min under sunlight illumination. The bandgap energy of 2.5 eV, the formation of a heterojunction of 10g-C3N4/-3ZnO-c-Zn2Ti3O8, crystalline nature of the phases, and high quantity of surface OH resulted in higher adsorption of organic molecules, causing a substantial improvement in degradation of methylene blue (MB) from ~1.8 to 2.2% per min, which in turn was ~70% better than other reported work.



中文翻译:

具有高度增强的可见光驱动的光催化活性的异质结催化剂gC 3 N 4 / -3ZnO-c-Zn 2 Ti 3 O 8

摘要

在这项研究中,通过溶胶-凝胶法改变ZnO / TiO 2的摩尔比并辅以在500°C下煅烧的方法,合成了原始的ZnO,TiO 2,六角形的ZnTiO 3和立方的Zn 2 Ti 3 O 8纳米颗粒。空气中2小时。与锌矿(ZnO)和锐钛矿/金红石(TiO 2)的原始相相比,具有3ZnO:1TiO 2(3ZT)的保留锌矿和c-Zn 2 Ti 3 O 8的杂化纳米结构显示出更高的光催化活性(〜82 % 45分钟内降解)。负载了10 wt%gC 3 N 4的3ZT光催化剂进一步增强了可见光在45分钟内在阳光照射下的光催化活性,降解率高达99%。为2.5eV的带隙能量,构成的异质结的形成10克-C 3 Ñ 4 / -3ZnO-C-Zn系2的Ti 3 ø 8,将各相的结晶性质,和表面的高量的OH -导致更高吸附的有机分子,使亚甲基蓝(MB)的降解从每分钟约1.8%大幅提高到2.2%,这反过来比其他已报道的工作要好约70%。

更新日期:2020-02-14
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