Investigation of copper sulfate pentahydrate dehydration by terahertz time-domain spectroscopy*

Ma, Yuanyuan; Huang, Haochong; Hao, Sibo; Tang, Weichong; Zheng, Zhiyuan; Zhang, Zili

doi:10.1088/1674-1056/28/6/060702

Cited by 8 publications

(3 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In recent years, terahertz spectroscopy with a longer band than infrared can fill the gap in this field. Terahertz time-domain spectroscopy (THz-TDS) has become an important tool for identifying material components and analyzing material characteristics [13][14][15][16] owing to its advantages of being non-contact, non-invasive, strong penetrability and high sensitivity [17][18][19]. HDPE is often used and tested as a substrate material in the terahertz range [20,21], Stefan Sommer et al [22] distinguished the crystalline state of HDPE by refractive index, and the adsorption characteristics of HDPE have been studied by Gas chromatography [8], liquid chromatography [23,24], etc.…”

Section: Introductionmentioning

confidence: 99%

Characterizations of high-density polyethylene by terahertz time-domain spectroscopy

Zhang,

Zheng

et al. 2023

TST

View full text Add to dashboard Cite

The optical properties of high-density polyethylene (HDPE) in the terahertz band are characterized by terahertz time-domain spectroscopy (THz-TDS). The results show that the THz-TDS can effectively distinguish the particle size of HDPE and filler content of HDPE. And it can also be used to characterize the adsorption characteristics of HDPE. These indicate that it can improve the performance of HDPE, industrial production and even environmental pollution of micro-size of HDPE.

show abstract

Section: Introductionmentioning

confidence: 99%

Characterizations of high-density polyethylene by terahertz time-domain spectroscopy

Zhang,

Zheng

et al. 2023

TST

View full text Add to dashboard Cite

show abstract

“…This technology has been also applied to detect agricultural pollution 45 . Terahertz techniques offer significant advantages for qualitative and quantitative studies of heavy metal ions in soil contaminants because of the complex structure of soil and its unique absorption properties for terahertz waves 46 – 48 .…”

Section: Introductionmentioning

confidence: 99%

Characterization of the remediation of chromium ion contamination with bentonite by terahertz time-domain spectroscopy

Cheng

Huang

Yang

et al. 2022

Sci Rep

Self Cite

View full text Add to dashboard Cite

Heavy metal pollution of agricultural and urban soils limits economic progress in the rapidly developing society. Terahertz technology is applied to detect heavy metal pollutants under existence of multiple pathways of their dissemination. In this study, terahertz time-domain spectroscopy (THz-TDS) is employed as an advanced probing technique in combination with traditional detecting methods to measure the adsorption ability of trivalent chromium ions on bentonite. The concentration of chromium ions and the weight of bentonite are known to influence on the adsorption capacity of the latter. It is tested here by both qualitative and quantitative measurements of two mentioned parameters. The adsorption process of chromium ions by bentonite is monitored using THz-TDS. The adsorptions signal from samples at 0.5 THz gradually increases with the increase of bentonite weight or chromium ion concentration. It would appear to indicate that terahertz could be used for quantitative detection of metal ions. Secondly, the ratios of results obtained by inductively coupled plasma mass spectrometry (ICP-MS) and the THz-TDS ones are stabilized at 0.105 ± 0.014 as the bentonite weight or chromium ion concentration increase. Such finding confirms that terahertz technology can be used for the quantitative detection of metal ions. Using the relationship between the ICP-MS test results and the THz-TDS ones, the amplitude value of bentonite is obtained to be 13.925 at the concentration of chromium ions of 0.05 mol/L, the mass of bentonite sample involved in adsorption of 1.5 g, and the detection frequency in THz-TDS measurements of 0.5 THz. The adsorption coefficient of bentonite is calculated to be 1.44%. Increase of the chromium ion concentration to 0.2 mol/L, and the mass of bentonite involved in adsorption to 3 g leads to the increase of the amplitude corresponding to adsorbed chromium ions to about 19.463, and the adsorption coefficient to about 2.1%. Obtained results demonstrate that terahertz technology is promising to meet the ever-increasing requirements in mineral analyses for rapid detection of chemical contaminants and measurement of the adsorption efficiencies of materials.

show abstract

“…This is because the rotation mode, vibration mode and energy related to the hydrogen bond of water molecules are in the THz band, which yields strong absorption characteristics of water to THz wave. [9][10][11] Due to the noncoincidence of positive and negative charges, water molecules are polarized and exhibit strong resonance absorption to terahertz wave. [12] Moreover, all kinds of sugar molecules in solution, such as glucose molecules in animal cells and sucrose molecules in plant cells, combine with free water to form hydrogen bonds, which limits the polarisation and free diffusion of water molecules in solution.…”

Section: Introductionmentioning

confidence: 99%

Effect of external electric field on the terahertz transmission characteristics of electrolyte solutions*

Wang¹,

Wang²,

Liu³

et al. 2021

Chinese Phys. B

View full text Add to dashboard Cite

We fabricated a microfluidic chip with simple structure and good sealing performance, and studied the influence of the electric field on THz absorption intensity of liquid samples treated at different times by using THz time domain spectroscopy system. The tested liquids were deionised water and CuSO4, CuCl2, NaHCO3, Na2CO3 and NaCl solutions. The transmission intensity of the THz wave increases as the standing time of the electrolyte solution in the electric field increases. The applied electric field alters the dipole moment of water molecules in the electrolyte solution, which affects the vibration and rotation of the whole water molecules, breaks the hydrogen bonds in the water, increases the number of single water molecules and leads to the enhancement of the THz transmission spectrum.

show abstract

Investigation of copper sulfate pentahydrate dehydration by terahertz time-domain spectroscopy*

Cited by 8 publications

References 25 publications

Characterizations of high-density polyethylene by terahertz time-domain spectroscopy

Characterizations of high-density polyethylene by terahertz time-domain spectroscopy

Characterization of the remediation of chromium ion contamination with bentonite by terahertz time-domain spectroscopy

Effect of external electric field on the terahertz transmission characteristics of electrolyte solutions*

Contact Info

Product

Resources

About