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A Z-scheme BiOCl/UiO-66(Zr/Ti) heterojunction with engineered interfacial contacts for synergistic pollutant mineralization and selective sulfoxidation.

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Title: A Z-scheme BiOCl/UiO-66(Zr/Ti) heterojunction with engineered interfacial contacts for synergistic pollutant mineralization and selective sulfoxidation.
Authors: Wu, Wentao1 (AUTHOR), Wu, Xingxing2 (AUTHOR), Peng, Chenkai1 (AUTHOR), Zhao, Yang3 (AUTHOR), Zhao, Danxia1 (AUTHOR) danxia@tzc.edu.cn
Source: CrystEngComm. 7/6/2026, Vol. 28 Issue 26, p4007-4018. 12p.
Subjects: Electrostatic fields, Metal-organic frameworks, Sulfinyl compounds, Photocatalysis, Holes (Electron deficiencies)
Abstract: Simultaneous deep mineralization of pollutants and selective oxidation of value-added substrates remains challenging due to the conflicting reactivity requirements of ·OH and 1O2. Here we construct a Z-scheme BiOCl/UiO-66(Zr/Ti) heterojunction in which work-function mismatch generates a built-in electric field that directs electrons to the MOF and holes to BiOCl. Ti is atomically dispersed within the UiO-66 framework, as confirmed by XAS and DFT, forming Zr–O–Ti bridges and oxygen vacancies that enhance charge separation. This spatial charge compartmentalization enables dual-ROS pathways: electrons accumulated on UiO-66 reduce O2 to ·OH for deep mineralization (98% dye decolorization, 88% TOC removal), while holes retained on BiOCl generate 1O2 for selective sulfoxidation (70% conversion, 99% selectivity). Trace rhodamine B acts as an in situ photosensitizer, amplifying both pathways via electron injection and triplet energy transfer. The colloidal architecture maintains >90% activity in real water matrices and over eight cycles with low energy consumption. This work establishes interfacial electric field engineering as a generalizable strategy to integrate environmental remediation and selective synthesis in a single photocatalytic platform. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:Simultaneous deep mineralization of pollutants and selective oxidation of value-added substrates remains challenging due to the conflicting reactivity requirements of ·OH and 1O2. Here we construct a Z-scheme BiOCl/UiO-66(Zr/Ti) heterojunction in which work-function mismatch generates a built-in electric field that directs electrons to the MOF and holes to BiOCl. Ti is atomically dispersed within the UiO-66 framework, as confirmed by XAS and DFT, forming Zr–O–Ti bridges and oxygen vacancies that enhance charge separation. This spatial charge compartmentalization enables dual-ROS pathways: electrons accumulated on UiO-66 reduce O2 to ·OH for deep mineralization (98% dye decolorization, 88% TOC removal), while holes retained on BiOCl generate 1O2 for selective sulfoxidation (70% conversion, 99% selectivity). Trace rhodamine B acts as an in situ photosensitizer, amplifying both pathways via electron injection and triplet energy transfer. The colloidal architecture maintains >90% activity in real water matrices and over eight cycles with low energy consumption. This work establishes interfacial electric field engineering as a generalizable strategy to integrate environmental remediation and selective synthesis in a single photocatalytic platform. [ABSTRACT FROM AUTHOR]
ISSN:14668033
DOI:10.1039/d6ce00195e