In this work, a simple
and sensitive electrochemical
method was
developed to determine ethyl violet (EV) dye in aqueous systems by
using square wave anodic stripping voltammetry (SWASV) employing a
glassy carbon electrode modified with acidic-functionalized carbon
nanotubes (COOH-
f
CNTs). In square wave anodic stripping
voltammetry, EV exhibited a well-defined oxidation peak at 0.86 V
at the modified GCE. Impedance spectroscopy and cyclic voltammetry
were used to examine the charge transduction and sensing capabilities
of the modified electrode. The influence of pH, deposition potential,
and accumulation time on the electro-oxidation of EV was optimized.
Under the optimum experimental conditions, the limit of detection
with a value of 0.36 nM demonstrates high sensitivity of COOH-
f
CNTs/GCE for EV. After detection, it was envisioned to
devise a method for the efficient removal of EV from an aqueous system.
In this regard a photocatalytic degradation method of EV using Ho/TiO
2
nanoparticles was developed. The Ho/TiO
2
nanoparticles
synthesized by the sol–gel method were characterized by UV–vis,
XRD, FTIR, SEM, and EDX. The photocatalytic degradation studies revealed
that basic medium is more suitable for a higher degradation rate of
EV than acidic and neutral media. The photodegradation kinetic parameters
were evaluated using UV–vis spectroscopic and electrochemical
methods. The results revealed that the degradation process of EV follows
first-order kinetics.