Ultra-sensitive electrocatalytic detection of bromate in drinking water based on Nafion/Ti3C2Tx (MXene) modified glassy carbon electrode

P. Abdul Rasheed; Ravi P. Pandey; Kashif Rasool; Khaled A. Mahmoud

doi:10.1016/j.snb.2018.03.103

Ultra-sensitive electrocatalytic detection of bromate in drinking water based on Nafion/Ti₃C₂T_x (MXene) modified glassy carbon electrode

P. Abdul Rasheed, Ravi P. Pandey, Kashif Rasool, Khaled A. Mahmoud^*

^*Corresponding author for this work

QEERI - Environment & Sustainability Center

Hamad bin Khalifa University

Research output: Contribution to journal › Article › peer-review

181 Citations (Scopus)

Abstract

A versatile and ultra-sensitive sensor platform based on lamellar Ti₃C₂T_x (MXene)-modified glassy carbon electrode has been developed for the detection of bromate (BrO₃ ⁻) in water. MXene showed unique electrocatalytic properties towards effective BrO₃ ⁻ reduction and the developed sensor displayed a linear response for the BrO₃ ⁻ concentration from 50 nM to 5 μM with a detection limit of 41 nM. The catalytic reduction of BrO₃ ⁻ by MXene was assumed by an increase of the peak current and a shift to lower potential. Surface changes to MXene after electrocatalytic reduction of BrO₃ ⁻ was investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The formation of trace TiO₂ crystals at the surface of Ti₃C₂T_x during the electrochemical reduction of BrO₃ ⁻ have confirmed the redox reaction between BrO₃ ⁻ and MXene. Also the developed sensor showed excellent selectivity for BrO₃ ⁻ among other interfering ions. This work provides an evidence for the application of MXene as an effective platform for detection of water contaminants especially when its redox functionality can be utilized.

Original language	English
Pages (from-to)	652-659
Number of pages	8
Journal	Sensors and Actuators B: Chemical
Volume	265
DOIs	https://doi.org/10.1016/j.snb.2018.03.103
Publication status	Published - 15 Jul 2018

Keywords

Bromate
Electrocatalytic detection
MXene
Reduction
Sensor
Water treatment

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10.1016/j.snb.2018.03.103

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title = "Ultra-sensitive electrocatalytic detection of bromate in drinking water based on Nafion/Ti3C2Tx (MXene) modified glassy carbon electrode",

abstract = "A versatile and ultra-sensitive sensor platform based on lamellar Ti3C2Tx (MXene)-modified glassy carbon electrode has been developed for the detection of bromate (BrO3 −) in water. MXene showed unique electrocatalytic properties towards effective BrO3 − reduction and the developed sensor displayed a linear response for the BrO3 − concentration from 50 nM to 5 μM with a detection limit of 41 nM. The catalytic reduction of BrO3 − by MXene was assumed by an increase of the peak current and a shift to lower potential. Surface changes to MXene after electrocatalytic reduction of BrO3 − was investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The formation of trace TiO2 crystals at the surface of Ti3C2Tx during the electrochemical reduction of BrO3 − have confirmed the redox reaction between BrO3 − and MXene. Also the developed sensor showed excellent selectivity for BrO3 − among other interfering ions. This work provides an evidence for the application of MXene as an effective platform for detection of water contaminants especially when its redox functionality can be utilized.",

keywords = "Bromate, Electrocatalytic detection, MXene, Reduction, Sensor, Water treatment",

author = "Rasheed, {P. Abdul} and Pandey, {Ravi P.} and Kashif Rasool and Mahmoud, {Khaled A.}",

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doi = "10.1016/j.snb.2018.03.103",

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AU - Rasheed, P. Abdul

AU - Pandey, Ravi P.

AU - Rasool, Kashif

AU - Mahmoud, Khaled A.

PY - 2018/7/15

Y1 - 2018/7/15

N2 - A versatile and ultra-sensitive sensor platform based on lamellar Ti3C2Tx (MXene)-modified glassy carbon electrode has been developed for the detection of bromate (BrO3 −) in water. MXene showed unique electrocatalytic properties towards effective BrO3 − reduction and the developed sensor displayed a linear response for the BrO3 − concentration from 50 nM to 5 μM with a detection limit of 41 nM. The catalytic reduction of BrO3 − by MXene was assumed by an increase of the peak current and a shift to lower potential. Surface changes to MXene after electrocatalytic reduction of BrO3 − was investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The formation of trace TiO2 crystals at the surface of Ti3C2Tx during the electrochemical reduction of BrO3 − have confirmed the redox reaction between BrO3 − and MXene. Also the developed sensor showed excellent selectivity for BrO3 − among other interfering ions. This work provides an evidence for the application of MXene as an effective platform for detection of water contaminants especially when its redox functionality can be utilized.

AB - A versatile and ultra-sensitive sensor platform based on lamellar Ti3C2Tx (MXene)-modified glassy carbon electrode has been developed for the detection of bromate (BrO3 −) in water. MXene showed unique electrocatalytic properties towards effective BrO3 − reduction and the developed sensor displayed a linear response for the BrO3 − concentration from 50 nM to 5 μM with a detection limit of 41 nM. The catalytic reduction of BrO3 − by MXene was assumed by an increase of the peak current and a shift to lower potential. Surface changes to MXene after electrocatalytic reduction of BrO3 − was investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The formation of trace TiO2 crystals at the surface of Ti3C2Tx during the electrochemical reduction of BrO3 − have confirmed the redox reaction between BrO3 − and MXene. Also the developed sensor showed excellent selectivity for BrO3 − among other interfering ions. This work provides an evidence for the application of MXene as an effective platform for detection of water contaminants especially when its redox functionality can be utilized.

KW - Bromate

KW - Electrocatalytic detection

KW - MXene

KW - Reduction

KW - Sensor

KW - Water treatment

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Ultra-sensitive electrocatalytic detection of bromate in drinking water based on Nafion/Ti₃C₂T_x (MXene) modified glassy carbon electrode

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