Solubility and Decomposition of Organic Compounds in Subcritical Water

Yabalak, Erdal; Akay, Sema; Kayan, Berkant; Gizir, A. Murat; Yang, Yu

doi:10.3390/molecules28031000

Cited by 13 publications

(8 citation statements)

References 59 publications

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“…For chromatographic analysis conducted at elevated temperatures, one of the main concerns is the instability or even the degradation of the analyzed compounds. Considering water as a mobile phase, hydrolysis and oxidation are the two most likely reactions [22,47]. It is obvious that the solubilities of organic compounds increase with higher water temperatures.…”

Section: Subcritical Water Separationsmentioning

confidence: 99%

“…Reducing analysis time results in lower exposure of analytes to the reaction. However, it must be emphasized that degradation increases with the rise in temperature [47]. Thompson and Carr analyzed several drugs and alkaloids to determine their thermal stability.…”

Section: Subcritical Water Separationsmentioning

confidence: 99%

“…It is obvious that the solubilities of organic compounds increase with higher water temperatures. However, the degree of degradation of organic compounds also increases with increasing water temperature [47].…”

Section: Subcritical Water Separationsmentioning

confidence: 99%

See 2 more Smart Citations

Exploring the green frontier: Subcritical water chromatography for sustainable analytical practices

Bocian,

Dembek,

Kalisz

2024

J of Separation Science

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Water in the subcritical state is characterized by properties significantly different from water under standard conditions. These include low viscosity, low surface tension, and a much lower dielectric constant, increasing the solubility of nonpolar substances. For this reason, it can provide an alternative solvent and be used in chromatographic techniques—subcritical water chromatography (SBWC). SBWC appears to be one of the greenest analytical techniques until we unravel chromatography with pure water at room temperature. The versatility of SBWC is explored through its applications in the separation and analysis of a wide range of compounds, including pharmaceuticals, natural products, etc. The use of subcritical water as a mobile phase requires suitable stable stationary phases and special apparatus. Still, it makes it possible to conduct analyses without using organic solvents. When using this technique, it is important to remember that it suits the analysis of thermally stable substances. The following work is a critical review of developments in SBWC.

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Section: Subcritical Water Separationsmentioning

confidence: 99%

Section: Subcritical Water Separationsmentioning

confidence: 99%

See 1 more Smart Citation

Exploring the green frontier: Subcritical water chromatography for sustainable analytical practices

Bocian,

Dembek,

Kalisz

2024

J of Separation Science

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show abstract

“…In addition to extracting diverse bioactive substances (such as polyphenols, pigments, essential oils, flavonoids, and peptides) from various raw materials, SBWE is also capable of extracting and remediating a wide range of contaminants (such as pesticides, PAHs, and PCBs) from various environmental matrices [ 25 , 26 , 27 , 28 , 29 , 30 ]. In this study, we present a comprehensive and systematic explanation of the SBWE approach for extracting organic pollutants from environmental matrices, including pesticides, pharmaceuticals, PAHs, PCBs, pharmaceuticals, and phthalates.…”

Section: Introductionmentioning

confidence: 99%

A Review: Subcritical Water Extraction of Organic Pollutants from Environmental Matrices

Yabalak,

Aminzai,

Gizir

et al. 2024

Molecules

Self Cite

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Most organic pollutants are serious environmental concerns globally due to their resistance to biological, chemical, and photolytic degradation. The vast array of uses of organic compounds in daily life causes a massive annual release of these substances into the air, water, and soil. Typical examples of these substances include pesticides, polychlorinated biphenyls (PCBs), and polycyclic aromatic hydrocarbons (PAHs). Since they are persistent and hazardous in the environment, as well as bio-accumulative, sensitive and efficient extraction and detection techniques are required to estimate the level of pollution and assess the ecological consequences. A wide variety of extraction methods, including pressurized liquid extraction, microwave-assisted extraction, supercritical fluid extraction, and subcritical water extraction, have been recently used for the extraction of organic pollutants from the environment. However, subcritical water has proven to be the most effective approach for the extraction of a wide range of organic pollutants from the environment. In this review article, we provide a brief overview of the subcritical water extraction technique and its application to the extraction of PAHs, PCBs, pesticides, pharmaceuticals, and others form environmental matrices. Furthermore, we briefly discuss the influence of key extraction parameters, such as extraction time, pressure, and temperature, on extraction efficiency and recovery.

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“…It is defined as the amount of oxygen consumed by the oxidation and decomposition of organic matter under controlled reaction temperature and time conditions [ 4 ]. Rapid and accurate detection of COD is of great significance for routine water quality monitoring, sewage treatment, and pollution source monitoring [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

A Method of Water COD Retrieval Based on 1D CNN and 2D Gabor Transform for Absorption–Fluorescence Spectra

et al. 2023

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Chemical Oxygen Demand (COD) is one of the indicators of organic pollution in water bodies. The rapid and accurate detection of COD is of great significance to environmental protection. To address the problem of COD retrieval errors in the absorption spectrum method for fluorescent organic matter solutions, a rapid synchronous COD retrieval method for the absorption–fluorescence spectrum is proposed. Based on a one-dimensional convolutional neural network and 2D Gabor transform, an absorption–fluorescence spectrum fusion neural network algorithm is developed to improve the accuracy of water COD retrieval. Results show that the RRMSEP of the absorption–fluorescence COD retrieval method is 0.32% in amino acid aqueous solution, which is 84% lower than that of the single absorption spectrum method. The accuracy of COD retrieval is 98%, which is 15.3% higher than that of the single absorption spectrum method. The test results on the actual sampled water spectral dataset demonstrate that the fusion network outperformed the absorption spectrum CNN network in measuring COD accuracy, with the RRMSEP improving from 5.09% to 1.15%.

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Solubility and Decomposition of Organic Compounds in Subcritical Water

Cited by 13 publications

References 59 publications

Exploring the green frontier: Subcritical water chromatography for sustainable analytical practices

Exploring the green frontier: Subcritical water chromatography for sustainable analytical practices

A Review: Subcritical Water Extraction of Organic Pollutants from Environmental Matrices

A Method of Water COD Retrieval Based on 1D CNN and 2D Gabor Transform for Absorption–Fluorescence Spectra

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