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Research Article

Synergistic effect of homojunction and Ohmic junctions in CdS boosting spatial charge separation for U(VI) photoreduction

Haonan Pei§, Zhimin Dong§, Zifan Li, Jian Huang, Yuanping Jiang, Zuojia Li, Lin Xu, Xiaohong Cao, Yunhai Liu( ), Zhibin Zhang( ), Guoping Yang( )
State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, China

§ Haonan Pei and Zhimin Dong contributed equally to this work.

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Graphical Abstract

In this work, we synthesized dandelion-like CdS(002)/(102) by controlling the growth mechanism of CdS through thermodynamic and kinetic factors, and then modified n-type CdS(002)/(102) semiconductors by using low functional metal Ni to construct homojunction and ohmic junction photocatalysts. On this basis, the synergistic quantum confinement effect of dandelion-like CdS provides a new catalytic strategy for the removal of uranium(VI) from radioactive wastewater and the solution of environmental pollution problems.

Abstract

Photo-excited holes usually migrate to the surface of the catalyst and rapidly recombine with electrons, reducing the photocatalytic reduction efficiency of uranium(VI) (U(VI)) in radioactive wastewater. Consequently, we employed a straightforward synthesis technique to meticulously shape and manipulate the morphology of CdS to precisely construct CdS-Ni dandelion-like composites with different aspect ratios. Briefly, the introduction of crystal facet homojunction with Ohmic contacts in this unique morphology siqnificantly improves the photocatalytic efficiency. Temperature-dependent photoluminescence spectroscopy (TD-PL) verifies that the composite material positively effects on the dissociation of excitons. Within 30 min, CdS(002)/(102)/Ni-4 removed 98% of the uranium content in solution and showed a rather high apparent rate constant (0.114 min−1), which was 4.8 times higher than that of CdS nanospheres (NSs) (0.024 min−1) and 3.7 times higher than that of CdS nanorods (NRs) (0.031 min−1). This is much higher the most reported photocatalysts for U(VI) reduction. Even after 5 consecutive cycles, the photocatalytic efficiency only decreased by 7%. This offers a fresh perspective on constructing a new perspective for building a green, efficient, and multi mechanism collaborative catalytic system to remediate environmental pollution.

Keywords

uraniumdandelion-shapedaxial size effectcrystal facet homojunctionohmic contact

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Nano Research
Volume 17 Issue 8,
August 2024
Pages 6849-6859
DOI: 10.1007/s12274-024-6637-y
Cite this article:
Pei H, Dong Z, Li Z, et al. Synergistic effect of homojunction and Ohmic junctions in CdS boosting spatial charge separation for U(VI) photoreduction. Nano Research, 2024, 17(8): 6849-6859. https://doi.org/10.1007/s12274-024-6637-y
Topics:
Photocatalysis

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Received: 02 February 2024
Revised: 03 March 2024
Accepted: 17 March 2024
Published: 18 April 2024
© Tsinghua University Press 2024
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