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Constructing ZrO2/La2O3 heterostructure to modulate internal electric fields for efficient phosphate electrosorption at low concentration.

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Title:	Constructing ZrO2/La2O3 heterostructure to modulate internal electric fields for efficient phosphate electrosorption at low concentration.
Authors:	Wang, Ruoding¹ (AUTHOR), Ge, Yu¹ (AUTHOR), Niu, Yuxuan¹ (AUTHOR), Zhang, Yujia¹ (AUTHOR), Wang, Yue² (AUTHOR), Cui, Li¹ (AUTHOR), Sun, Peipei¹ (AUTHOR), Yin, Zhonglong¹ (AUTHOR), Yang, Weiben¹ (AUTHOR) yangwb007@njnu.edu.cn
Source:	Colloids & Surfaces A: Physicochemical & Engineering Aspects. Aug2026:Part 2, Vol. 742, pN.PAG-N.PAG. 1p.
Subjects:	Phosphate removal (Water purification), Heterostructures, Wastewater treatment, Electric fields, Electrodes, Oxygen vacancy, Adsorption kinetics, Ab-initio calculations
Abstract:	Electrosorption is effective in the treatment of wastewater and phosphate removal. Despite some important achievements, the progress is still lower than expected, especially for low-concentration phosphate, mostly because of slow ion transport and weak anti-interference capability. In this work, we constructed a heterojunction composite electrode (ZrO 2 /La 2 O 3 /C) to induce interfacial charge redistribution for efficient phosphate removal. The optimized electrode exhibited a high saturation adsorption amounts of 437.21 mg-P g−1 at 1.2 V. Characterizations and DFT calculations reveal that ZrO 2 /La 2 O 3 /C heterojunction drives electron transfer from La to neighboring Zr in the Zr-O-La coordination units through oxygen-mediated super-exchange interactions, thereby inducing the generation of internal electric field. This shifts the Zr d-band center positively, generating more electron states at the E f and lowering the adsorption energy barrier, which accelerates the phosphate adsorption kinetics. It also demonstrates excellent stability and anti-interference capability in the presence of multiple competing anions. This study proposes a heterostructure-engineering strategy for the construction of Zr-based electrodes, providing a rational route for efficient phosphate removal under low-concentration conditions. [Display omitted] • Constructing a heterojunction electrode by inducing interfacial charge redistribution. • The optimized electrode delivered a maximum adsorption capacity of 437.21 mg-P g−1. • Built-in fields and interfacial charge transfer lower the adsorption energy barrier. • Oxygen vacancy serve as extra active sites that reduce the adsorption barrier. [ABSTRACT FROM AUTHOR]
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Database:	Engineering Source

Description
Abstract:	Electrosorption is effective in the treatment of wastewater and phosphate removal. Despite some important achievements, the progress is still lower than expected, especially for low-concentration phosphate, mostly because of slow ion transport and weak anti-interference capability. In this work, we constructed a heterojunction composite electrode (ZrO 2 /La 2 O 3 /C) to induce interfacial charge redistribution for efficient phosphate removal. The optimized electrode exhibited a high saturation adsorption amounts of 437.21 mg-P g−1 at 1.2 V. Characterizations and DFT calculations reveal that ZrO 2 /La 2 O 3 /C heterojunction drives electron transfer from La to neighboring Zr in the Zr-O-La coordination units through oxygen-mediated super-exchange interactions, thereby inducing the generation of internal electric field. This shifts the Zr d-band center positively, generating more electron states at the E f and lowering the adsorption energy barrier, which accelerates the phosphate adsorption kinetics. It also demonstrates excellent stability and anti-interference capability in the presence of multiple competing anions. This study proposes a heterostructure-engineering strategy for the construction of Zr-based electrodes, providing a rational route for efficient phosphate removal under low-concentration conditions. [Display omitted] • Constructing a heterojunction electrode by inducing interfacial charge redistribution. • The optimized electrode delivered a maximum adsorption capacity of 437.21 mg-P g−1. • Built-in fields and interfacial charge transfer lower the adsorption energy barrier. • Oxygen vacancy serve as extra active sites that reduce the adsorption barrier. [ABSTRACT FROM AUTHOR]
ISSN:	09277757
DOI:	10.1016/j.colsurfa.2026.140474