THESIS
2020
xiii, 87 pages : illustrations (chiefly color) ; 30 cm
Abstract
Aggravated by human and industrial activities, environmental pollution has become a
severe problem, causing widespread concern in society, and cannot be ignored. The problem of
heavy metal pollution is particularly prominent. Therefore, environmental researchers need to
find a rapid method to detect heavy metal ions. In this thesis, graphene/noble nanoparticles-modified
electrodes are proposed and successfully applied for the high-performance detection
of heavy metal ions using electrochemical technology.
In Chapter 1, a concise overview of heavy metal ions and the relevant works by others in
the detection of heavy metals by various techniques is introduced.
In Chapter 2, we describe a facile electrochemical method to fabricate graphene and Au
nanoparticle (NP)-coated electrode...[
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Aggravated by human and industrial activities, environmental pollution has become a
severe problem, causing widespread concern in society, and cannot be ignored. The problem of
heavy metal pollution is particularly prominent. Therefore, environmental researchers need to
find a rapid method to detect heavy metal ions. In this thesis, graphene/noble nanoparticles-modified
electrodes are proposed and successfully applied for the high-performance detection
of heavy metal ions using electrochemical technology.
In Chapter 1, a concise overview of heavy metal ions and the relevant works by others in
the detection of heavy metals by various techniques is introduced.
In Chapter 2, we describe a facile electrochemical method to fabricate graphene and Au
nanoparticle (NP)-coated electrodes. The presence of graphene and AuNPs enhances the
performance of these modified electrodes. An AuNP/rGO/GCE(SPCE) was fabricated by in-situ
electroreduction and electrodeposition with CV and i-t. The electrochemical performance
of this modified electrode was determined by the concentration of Hg
2+ under optimal
conditions.
In Chapter 3, a gold amalgam and graphene-modified electrode (Hg/Au/rGO/GCE) was
developed and employed to detect Pb
2+. However, this modified electrode cannot detect various
heavy metal ions simultaneously, thus, some improvements were put forward in Chapter 4.
In Chapter 4, we present an in-situ mercury film-coated graphene-based glassy carbon
electrode (Hg/rGO/GCE). The electrode was prepared and applied for selective and sensitive
electrochemical detection of Cd
2+, Pb
2+ and Cu
2+ simultaneously with high sensitivity and
selectivity.
Finally, in the concluding chapter, the achievements of this thesis are summarized some
future works are presented.
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