Abstract:An electrochemical sensor based on a modified glassy carbon electrode (GCE) with reduced graphene oxide and Ni-Au nanoparticles (Ni(OH) 2 /AuNp/rGO/GCE) was developed for the determination of ethylene glycol. The graphene oxide was reduced electrochemically at the electrode surface by chronoamperometry, the gold nanoparticles were deposited by chronopotentiometry while the nickel hydroxide nanoparticles were deposited by cyclic voltammetry. The characterization of graphene oxide was performed by Raman spectros… Show more
“…It is broadly applied in numerous industries such as petroleum, oil, paint, textile, plastic, and even road industry for its chemical features. Despite its undeniable uses, from the point of view of environment and human health, its excessive use may have risks [1][2][3][4]. Alcoholic compounds can penetrate in water and soil and cause to pollution of groundwater.…”
Within this work, pristine zinc oxide and copper-doped powders were prepared using a sol–gel technic. Important physical properties such as morphological, optical, and structural features of the samples have been studied. Different data including X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDX), and Brunauer–Emmett–Teller analysis (BET), UV–Vis spectrophotometry, and Fourier transform infrared spectroscopy (FTIR) were collected to investigate the physical features of the samples. In addition, the ethylene glycol vapor sensing capability of the prepared samples was investigated and compared with other vapors like as ethanol, methanol, acetone, isopropanol, and dimethylformamide. The results demonstrated that the samples have a very good selectivity to ethylene glycol (up to 50 times for ZnO and 13 times for ZnO:Cu 20%). The most important parameter of sensing namely operating temperature, real-time variation, sensitivity, and response/recovery times were also evaluated for pristine zinc oxide and copper-doped nano-structures. Specifically, the ZnO nano-structure sensor represented prominent sensitivity of about 37 and 139 towards for ethylene glycol concentration of 200 and 700 ppm, respectively.
“…It is broadly applied in numerous industries such as petroleum, oil, paint, textile, plastic, and even road industry for its chemical features. Despite its undeniable uses, from the point of view of environment and human health, its excessive use may have risks [1][2][3][4]. Alcoholic compounds can penetrate in water and soil and cause to pollution of groundwater.…”
Within this work, pristine zinc oxide and copper-doped powders were prepared using a sol–gel technic. Important physical properties such as morphological, optical, and structural features of the samples have been studied. Different data including X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDX), and Brunauer–Emmett–Teller analysis (BET), UV–Vis spectrophotometry, and Fourier transform infrared spectroscopy (FTIR) were collected to investigate the physical features of the samples. In addition, the ethylene glycol vapor sensing capability of the prepared samples was investigated and compared with other vapors like as ethanol, methanol, acetone, isopropanol, and dimethylformamide. The results demonstrated that the samples have a very good selectivity to ethylene glycol (up to 50 times for ZnO and 13 times for ZnO:Cu 20%). The most important parameter of sensing namely operating temperature, real-time variation, sensitivity, and response/recovery times were also evaluated for pristine zinc oxide and copper-doped nano-structures. Specifically, the ZnO nano-structure sensor represented prominent sensitivity of about 37 and 139 towards for ethylene glycol concentration of 200 and 700 ppm, respectively.
“…This emphasis on detecting low-concentration, targeted gases has become the central focus of gas sensor research. Ethylene glycol is a commonly used industrial raw material with various physical and chemical properties such as being colorless, odorless, and possessing a low volatility point, low combustibility, and excellent flash point. − It finds applications in synthetic fibers, surfactants, and antifreeze. In elevated-temperature settings, the hydroxyl group of ethylene glycol may undergo oxidation, transforming into glycolic acid and subsequently to oxalic acid.…”
Ethylene glycol, a common industrial
raw material, finds
widespread
usage in various production and life applications such as antifreeze
and chemical synthesis. However, it poses a threat to human health,
being both odorless and colorless, which makes its detection difficult.
Previous ethylene glycol sensors have had limited success in detecting
low concentrations of the substance (response of 400–30 ppm).
Hence, there is a need for a highly responsive and selective ethylene
glycol sensor. In this study, different hydrothermal temperatures
of 160–180 °C were used to prepare the precursor of ZIF-8,
and the final ZnO nanorod sample was prepared accordingly. It was
tested in the air environment of 20 °C and 10%RH and the product’s
response and selectivity to ethylene glycol were systematically studied.
The findings indicate that the sensor exhibited exceptional performance,
displaying an ultrahigh response of 3264 for 25 ppm of ethylene glycol
when operated at a temperature of 180 °C, along with high selectivity.
Notably, in this study, the utilization of various zinc sources led
to alterations in the crystal plane spacing of the resultant product.
The remarkable gas-sensing performance can be attributed to the heightened
presence of surface oxygen defects. Specifically, the oxygen vacancy
content of the 200-ZIF sample increased by 9.2%, resulting in the
corresponding adjustments in the carrier concentration. The results
demonstrate that ZnO derived from ZIF-8 outperforms the hydrothermal
method in sensing ethylene glycol, thus offering an approach for the
precise detection of this compound.
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