Highly Efficient UV–Visible Photocatalyst from Monolithic 3D Titania/Graphene Quantum Dot Heterostructure Linked by Aminosilane,Advanced Sustainable Systems

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Highly Efficient UV–Visible Photocatalyst from Monolithic 3D Titania/Graphene Quantum Dot Heterostructure Linked by Aminosilane
Advanced Sustainable Systems ( IF 6.5 ) Pub Date : 2019-09-18 , DOI: 10.1002/adsu.201900084
Hyewon Yoon ₁ , Kisung Lee ₁ , Hyojung Kim ₂ , Minsu Park ₁ , Travis G. Novak ₁ , Gayea Hyun ₁ , Mun Seok Jeong ₂ , Seokwoo Jeon ₁

Affiliation

As rapidly growing environmental pollution demands the development of efficient photocatalytic materials, tremendous attention has been drawn to TiO₂, a widely used photocatalytic material with cost‐effectiveness, stability, and outstanding reactivity. To maximize its photocatalytic efficiency by enhancing the photogenerated charge separation, lowering the intrinsically large bandgap (3.2 eV) of TiO₂ is a key problem to be overcome. Herein, a new design is reported for an efficient photocatalyst realized by heterostructuring a 3D nanostructured TiO₂ monolith (3D TiO₂) and graphene quantum dots (GQDs) through using 3‐aminopropyltriethoxysilane (APTES) as a linker. The incorporation of APTES between the TiO₂/GQD interface enables the formation of a charge injection‐type heterostructure, as confirmed by transient absorption spectroscopy, providing improvement of both visible absorption and charge separation. As a result, the heterostructure exhibits a 242% enhanced photocatalytic performance compared to that of nonheterostructured 3D TiO₂ under visible irradiation, demonstrating its promising potential for practical photocatalytic applications in environmental remediation.

中文翻译：

氨基硅烷连接的整体式3D二氧化钛/石墨烯量子点异质结构的高效紫外可见光催化剂

随着迅速增长的环境污染要求开发高效的光催化材料，TiO ₂已经引起了极大的关注，TiO ₂是一种具有成本效益，稳定性和出色的反应性的广泛使用的光催化材料。为了通过增强光生电荷的分离来最大化其光催化效率，降低本质上较大的TiO ₂带隙（3.2 eV）是需要克服的关键问题。在本文中，报告了一种新的高效光催化剂设计，该催化剂通过使用3-氨基丙基三乙氧基硅烷（APTES）作为连接剂，异质结构化3D纳米结构TiO ₂整料（3D TiO ₂）和石墨烯量子点（GQDs）而实现。在TiO ₂之间掺入APTES/ GQD界面可形成电荷注入型异质结构，这已由瞬态吸收光谱法证实，从而改善了可见光吸收和电荷分离。结果，与非杂结构的3D TiO ₂在可见光照射下相比，该异结构显示出242％的增强的光催化性能，证明了其在环境修复中的实际光催化应用前景广阔。

更新日期：2019-11-14

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