TY - JOUR
T1 - Synergy of Ti-O-based heterojunction and hierarchical 1D nanobelt/3D microflower heteroarchitectures for enhanced photocatalytic tetracycline degradation and photoelectrochemical water splitting
AU - Wang, Q.
AU - Zhu, Hongmin
AU - Li, Bing
N1 - Funding Information:
The authors gratefully acknowledge the financial support provided by the National Natural Science Foundation of China (No. 51774145 ). The first author also thanks the China Scholarship Council (CSC) for financial support.
Publisher Copyright:
© 2019 Elsevier B.V.
Copyright:
Copyright 2019 Elsevier B.V., All rights reserved.
PY - 2019/12/15
Y1 - 2019/12/15
N2 - Solar-driven photocatalytic pollutant degradation and photoelectrochemical (PEC) water splitting are promising approaches for green environmental remediation and solar energy conversion. In this work, novel hierarchical 1D K2Ti6O13 nanobelt/3D TiO2 microflower heteroarchitectures were controllably synthesized via a facile hydrothermal route. The optimal K2Ti6O13/TiO2 hybrids exhibited much higher photocatalytic activity than single catalysts and good stability for tetracycline (TC) degradation. The removal of TC was also evaluated at different catalyst dosage, temperature, pH and concentration of TC solutions. The contributions of radical species for TC degradation followed a sequence of [rad]OH > h+ > [rad]O2−. The intermediates and degradation pathway of TC were determined by LC-MS analysis. Furthermore, significantly enhanced PEC responses of K2Ti6O13/TiO2 composites were also observed compared with the single components, fully proved by open-circuit potential, LSV, transient photocurrent and EIS analysis. Such superior photoactivities were mainly attributed to the synergistic effects between the strongly coupled K2Ti6O13/TiO2 heterojunctions and hierarchical 1D/3D micro-nano architectures, including larger surface area, increased light adsorption and charge separation efficiency. Overall, this work offers a controllable strategy to design novel Ti-O-based heterostructures with hierarchical micro-nano architectures and outstanding performance for photocatalytic and PEC applications.
AB - Solar-driven photocatalytic pollutant degradation and photoelectrochemical (PEC) water splitting are promising approaches for green environmental remediation and solar energy conversion. In this work, novel hierarchical 1D K2Ti6O13 nanobelt/3D TiO2 microflower heteroarchitectures were controllably synthesized via a facile hydrothermal route. The optimal K2Ti6O13/TiO2 hybrids exhibited much higher photocatalytic activity than single catalysts and good stability for tetracycline (TC) degradation. The removal of TC was also evaluated at different catalyst dosage, temperature, pH and concentration of TC solutions. The contributions of radical species for TC degradation followed a sequence of [rad]OH > h+ > [rad]O2−. The intermediates and degradation pathway of TC were determined by LC-MS analysis. Furthermore, significantly enhanced PEC responses of K2Ti6O13/TiO2 composites were also observed compared with the single components, fully proved by open-circuit potential, LSV, transient photocurrent and EIS analysis. Such superior photoactivities were mainly attributed to the synergistic effects between the strongly coupled K2Ti6O13/TiO2 heterojunctions and hierarchical 1D/3D micro-nano architectures, including larger surface area, increased light adsorption and charge separation efficiency. Overall, this work offers a controllable strategy to design novel Ti-O-based heterostructures with hierarchical micro-nano architectures and outstanding performance for photocatalytic and PEC applications.
KW - Hierarchical micro-nano heteroarchitectures
KW - KTiO/TiO heterojunction
KW - Photocatalytic degradation
KW - Photoelectrochemical water splitting
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U2 - 10.1016/j.cej.2019.122072
DO - 10.1016/j.cej.2019.122072
M3 - Article
AN - SCOPUS:85068228070
VL - 378
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
SN - 1385-8947
M1 - 122072
ER -