Journal ArticleDOI
Sensitive and selective electrochemical detection of chromium(VI) based on gold nanoparticle-decorated titania nanotube arrays
Wei Jin,Guosheng Wu,Aicheng Chen +2 more
TLDR
It was found that the electrochemical reduction of Cr(VI) at the Ti/TiO2NT/Au electrode exhibited an almost 23 fold improvement in activity as compared to a polycrystalline gold electrode, due to its nanoparticle/nanotubular heterojunction infrastructure.Abstract:
Owing to the severe toxicity and mobility of Cr(VI) in biological and environmental systems, it is of great importance to develop convenient and reliable methods for its detection. Here we report on a facile and effective electrochemical technique for monitoring Cr(VI) concentrations based on the utilization of Au nanoparticle-decorated titania nanotubes (TiO2NTs) grown on a titanium substrate. It was found that the electrochemical reduction of Cr(VI) at the Ti/TiO2NT/Au electrode exhibited an almost 23 fold improvement in activity as compared to a polycrystalline gold electrode, due to its nanoparticle/nanotubular heterojunction infrastructure. As a result, the Ti/TiO2NT/Au electrode demonstrated a wide linear concentration range from 0.10 μM to 105 μM, a low detection limit of 0.03 μM, and a high sensitivity of 6.91 μA μM−1 Cr(VI) via amperometry, satisfying the detection requirements of the World Health Organization (WHO). Moreover, the Ti/TiO2NT/Au electrode exhibited good resistance against interference from coexisting Cr(III) and other metal ions, and excellent recovery for Cr(VI) detection in both tap and lake water samples. These attributes suggest that this hybrid sensor has strong potential in applications for the selective detection of Cr(VI).read more
Citations
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Journal ArticleDOI
A review on detection of heavy metal ions in water – An electrochemical approach
Manju Bhargavi Gumpu,Swaminathan Sethuraman,Uma Maheswari Krishnan,John Bosco Balaguru Rayappan +3 more
TL;DR: In this article, the toxicity mechanisms of various metal ions and their relationship towards the induction of oxidative stress have been summarized, and electrochemical biosensors employed in the detection of metal ions with various interfaces have been highlighted.
Journal ArticleDOI
Electrochemical processes for the environmental remediation of toxic Cr(VI): A review
TL;DR: In this article, a review aims at recent advances in electrochemical technology for practical hexavalent chromium (Cr(VI) treatment applications, and the mechanism and performance of different strategies are commented and compared.
Journal ArticleDOI
Fluorescence sensing of chromium (VI) and ascorbic acid using graphitic carbon nitride nanosheets as a fluorescent “switch”
Mingcong Rong,Liping Lin,Xinhong Song,Yiru Wang,Yunxin Zhong,Jiawei Yan,Yufeng Feng,Xiuya Zeng,Xi Chen +8 more
TL;DR: Using graphitic carbon nitride (g-C3N4) nanosheets, an effective and facile fluorescence sensing approach for the label-free and selective determination of chromium (VI) (Cr(VI), which has the potential application for detection of Cr(VI) in lake waters and AA in biological fluids.
Journal ArticleDOI
Earth-abundant transition metal and metal oxide nanomaterials: Synthesis and electrochemical applications
TL;DR: In this article, a review gives an account of the various emerging synthesis of EATM&MO nanomaterials and their nanocomposites using numerous chemical strategies for the state-of-the-art electrochemical applications.
Journal ArticleDOI
Nanomaterials-based electrochemical detection of chemical contaminants
TL;DR: In this article, the authors assess various concepts and recent advancements in design and the application of state-of-the-art nanomaterials through the incorporation of carbon nanometrics, metallic and metallic oxide nanoparticles, titanium dioxide nanotubes, and dendrimers toward the development of electrochemical sensors for the detection of chemical contaminants in the environment and in foods.
References
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Journal ArticleDOI
Chromium occurrence in the environment and methods of its speciation.
J. Kotaś,Z. Stasicka +1 more
TL;DR: It is demonstrated that knowledge of interconversion processes between different Cr forms is necessary to understand its behaviour and role in the environment, in addition to enabling reliable Cr speciation analysis to be performed.
Journal ArticleDOI
Anodic oxidation of titanium and TA6V alloy in chromic media. An electrochemical approach
TL;DR: In this article, both voltametric (potentio-dynamic) and chrono-amperometric (constant voltage, either applied directly or progressively increased during the first steps of the treatment) experiments are conducted.
Journal ArticleDOI
Nanomaterials based electrochemical sensors for biomedical applications
TL;DR: The utility of nanomaterials, which are currently being studied for in vivo and in vitro medical applications as robust and tunable diagnostic and therapeutic platforms, is highlighted.
Journal ArticleDOI
Chromium(III) hydrolysis constants and solubility of chromium(III) hydroxide
Journal ArticleDOI
pH-Induced aggregation of gold nanoparticles for photothermal cancer therapy.
TL;DR: The gold nanoparticles show selective and efficient destruction of cancerous cells with an intensity threshold of 5 W/cm(2) to induce the thermal destruction and shows a new proof-of-concept for photothermal cancer therapy that exploits collective plasmon modes of metal nanoparticles.
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