Light-triggered oxidative activity of chromate at neutral pH: A colorimetric system for accurate and on-site detection of Cr(VI) in natural water

Hexavalent chromium (Cr(VI)), a confirmed human respiratory carcinogen, has attracted widespread attention due to its high toxicity and mobility in natural water systems. However, the developed catalytic colorimetric probes for Cr(VI) detection remain challenging, such as various species of Cr(VI) c...

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Published in:Journal of hazardous materials Vol. 440; p. 129812
Main Authors: Liao, Jing, Wu, Yuke, Chen, Xueshan, Yu, Huimin, Lin, Yao, Huang, Ke, Zhang, Jinyi, Zheng, Chengbin
Format: Journal Article
Language:English
Published: Elsevier B.V 15.10.2022
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ISSN:0304-3894, 1873-3336
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Abstract Hexavalent chromium (Cr(VI)), a confirmed human respiratory carcinogen, has attracted widespread attention due to its high toxicity and mobility in natural water systems. However, the developed catalytic colorimetric probes for Cr(VI) detection remain challenging, such as various species of Cr(VI) coexisting in water or acid buffer, the obvious interference from oxidizing ions at acidic pH, the synthesis of complex materials, and the consumption of hydrogen peroxide. In this work, a phenomenon of UV light-triggered chromate to produce singlet oxygen under neutral pH was found. An environmentally-friendly method based on the rapid oxidation of chromogenic substrates was thus developed for the highly specific and accurate detection of Cr(VI). Cr(VI) serves as both the active center and the target of this system, which ensures the rapidity, simplicity, and environmental protection of the proposed colorimetric strategy. Importantly, the neutral catalytic condition ensures that the predominant species CrO42- can be accurately quantified and avoids the interference of oxidizing ions. Subsequently, a portable analytical system integrating an array of LED lamps, a miniature color reading device, and a developed smartphone-based program was successfully developed to accomplish high-throughput and on-site analysis of Cr(VI) in natural water. The proposed method provides a rapid screening and water quality assessment tool for the faster, more cost-effective, and accurate detection of Cr(VI) in the water system. [Display omitted] •The light-triggered oxidative activity of Cr(VI) at neutral pH was first proposed.•Cr(VI) is a green ionic photosensitizer that can generate singlet oxygen.•Accurate, selective, and environmentally-friendly analysis of Cr(VI) was obtained.•The portable colorimetric method is rapid, sensitive, and high throughput.•The developed colorimetric system can predict Cr(VI) pollution in natural water.
AbstractList Hexavalent chromium (Cr(VI)), a confirmed human respiratory carcinogen, has attracted widespread attention due to its high toxicity and mobility in natural water systems. However, the developed catalytic colorimetric probes for Cr(VI) detection remain challenging, such as various species of Cr(VI) coexisting in water or acid buffer, the obvious interference from oxidizing ions at acidic pH, the synthesis of complex materials, and the consumption of hydrogen peroxide. In this work, a phenomenon of UV light-triggered chromate to produce singlet oxygen under neutral pH was found. An environmentally-friendly method based on the rapid oxidation of chromogenic substrates was thus developed for the highly specific and accurate detection of Cr(VI). Cr(VI) serves as both the active center and the target of this system, which ensures the rapidity, simplicity, and environmental protection of the proposed colorimetric strategy. Importantly, the neutral catalytic condition ensures that the predominant species CrO₄²⁻ can be accurately quantified and avoids the interference of oxidizing ions. Subsequently, a portable analytical system integrating an array of LED lamps, a miniature color reading device, and a developed smartphone-based program was successfully developed to accomplish high-throughput and on-site analysis of Cr(VI) in natural water. The proposed method provides a rapid screening and water quality assessment tool for the faster, more cost-effective, and accurate detection of Cr(VI) in the water system.
Hexavalent chromium (Cr(VI)), a confirmed human respiratory carcinogen, has attracted widespread attention due to its high toxicity and mobility in natural water systems. However, the developed catalytic colorimetric probes for Cr(VI) detection remain challenging, such as various species of Cr(VI) coexisting in water or acid buffer, the obvious interference from oxidizing ions at acidic pH, the synthesis of complex materials, and the consumption of hydrogen peroxide. In this work, a phenomenon of UV light-triggered chromate to produce singlet oxygen under neutral pH was found. An environmentally-friendly method based on the rapid oxidation of chromogenic substrates was thus developed for the highly specific and accurate detection of Cr(VI). Cr(VI) serves as both the active center and the target of this system, which ensures the rapidity, simplicity, and environmental protection of the proposed colorimetric strategy. Importantly, the neutral catalytic condition ensures that the predominant species CrO42- can be accurately quantified and avoids the interference of oxidizing ions. Subsequently, a portable analytical system integrating an array of LED lamps, a miniature color reading device, and a developed smartphone-based program was successfully developed to accomplish high-throughput and on-site analysis of Cr(VI) in natural water. The proposed method provides a rapid screening and water quality assessment tool for the faster, more cost-effective, and accurate detection of Cr(VI) in the water system. [Display omitted] •The light-triggered oxidative activity of Cr(VI) at neutral pH was first proposed.•Cr(VI) is a green ionic photosensitizer that can generate singlet oxygen.•Accurate, selective, and environmentally-friendly analysis of Cr(VI) was obtained.•The portable colorimetric method is rapid, sensitive, and high throughput.•The developed colorimetric system can predict Cr(VI) pollution in natural water.
ArticleNumber 129812
Author Chen, Xueshan
Huang, Ke
Zheng, Chengbin
Liao, Jing
Wu, Yuke
Lin, Yao
Zhang, Jinyi
Yu, Huimin
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  givenname: Chengbin
  surname: Zheng
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  organization: Key Laboratory of Green Chemistry & Technology of MOE, College of Chemistry, Sichuan University, Chengdu, Sichuan 610065, China
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Keywords Neutral pH
Colorimetric sensor
Cr(VI) detection
Photocatalytic oxidation
On-site analysis
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Snippet Hexavalent chromium (Cr(VI)), a confirmed human respiratory carcinogen, has attracted widespread attention due to its high toxicity and mobility in natural...
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StartPage 129812
SubjectTerms carcinogens
chromates
chromium
color
Colorimetric sensor
colorimetry
cost effectiveness
Cr(VI) detection
ecotoxicology
environmental protection
humans
hydrogen peroxide
Neutral pH
On-site analysis
oxidation
oxygen
photocatalysis
Photocatalytic oxidation
photosensitizing agents
singlet oxygen
toxicity
water quality
Title Light-triggered oxidative activity of chromate at neutral pH: A colorimetric system for accurate and on-site detection of Cr(VI) in natural water
URI https://dx.doi.org/10.1016/j.jhazmat.2022.129812
https://www.proquest.com/docview/2718325140
Volume 440
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