Enhanced photocatalytic activity of ternary g-C 3 N 4 /NaTaO 3 /biomass carbon composite photocatalysts under visible-li
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Enhanced photocatalytic activity of ternary g-C3N4/ NaTaO3/biomass carbon composite photocatalysts under visible-light radiation Shengze Li1, Jinlong Liao1, Yubin Dong1, Yaqin Fu1, and Yaofeng Zhu1,* 1
Key Laboratory of Advanced Textile Materials and Manufacturing Technology Ministry of Education, Zhejiang Sci-Tech University, Hangzhou 310018, Zhejiang, China
Received: 7 May 2020
ABSTRACT
Accepted: 11 September 2020
Highly efficient visible-light-responsive ternary graphitic carbon nitride (gC3N4)/NaTaO3/biomass carbon (BM-C) photocatalysts with different g-C3N4 amounts were prepared via a solvothermal method combined with a hightemperature sintering method. Herein, the crystal structure and morphology of g-C3N4/NaTaO3/BM-C are investigated in detail. The light-response characteristics of g-C3N4/NaTaO3/BM-C composites are effectively extended into the visible-light region. Compared with NaTaO3/BM-C and g-C3N4/NaTaO3, the g-C3N4/NaTaO3/BM-C composite showed high visible-light catalytic performance when the mass ratio of melamine (the g-C3N4 precursor) to binary NaTaO3/BM-C is 4:1, and the degradation extent of 95.85% for Rhodamine B can be reached in 60 min under visible-light irradiation. In addition, the photocatalytic mechanism showed that the enhanced photocatalytic activity of the composite may be attributed to the introduction of g-C3N4, which expanded the visible-light response range and the formation and effect of a good synergistic effect of BM-C and various components. This work provides useful insights for promoting the practical process of sodium tantalate photocatalytic materials.
Springer Science+Business
Media, LLC, part of Springer Nature 2020
1 Introduction For decades, with the rapid growth of the world economy, the energy crisis and environmental pollution have become ever-increasing problems globally, posing a serious threat to human production and life [1–4]. Semiconductor-based photocatalysis technology is a promising green chemical technique with great potential in wastewater purification [5–10].
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https://doi.org/10.1007/s10854-020-04488-z
Among them, NaTaO3 is particularly attractive due to its nontoxicity, chemical and physical stability, and structural properties [11]. Moreover, NaTaO3 has favorable band-edge potentials and photogenerated electron–hole pair separation because of the large bond angle of Ta–O–Ta, which are primary reasons for higher efficiency [12–14]. However, because of its wide band-gap energy (3.8–4.0 eV), the photocatalytic activity of NaTaO3 is limited to the ultraviolet
J Mater Sci: Mater Electron
(UV) region, which greatly reduces its photocatalytic efficiency and restricts its widespread applications [15, 16]. To remedy the limitation of NaTaO3 and to enhance its visible-light photocatalytic activity, many efforts such as doping with a nonmetal [17, 18], depositing noble metals [19, 20], applying sacrificial [21], and constructing heterojunction photocatalysts [22–24] have been made. Recently, the fa
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