Application of synthetic benzoic acid technology in environmental radiocarbon monitoring

Feng, Bin; Zhao, Chao; Chen, Bin; Zhuo, Weihai; Liu, Yiwen; Wang, Liangzi; He, Liang; Tang, Fangqiong

doi:10.1016/j.jenvrad.2020.106188

Cited by 6 publications

(4 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, numerous radiocarbon laboratories worldwide are still equipped with counters for processing relatively large samples, although often they also have graphite preparation lines 28 to enable analysis of smaller samples using AMS, i.e., these laboratories function as AMS satellite laboratories. Nuclear waste 29 and environmental monitoring 30 and the authentication of natural products 31 often rely on beta-ionization counting techniques because the costs of equipment/analysis are significantly lower and sample size is not a limitation.…”

Section: [H2] Equipment [H3] Beta-counting Techniquesmentioning

confidence: 99%

Radiocarbon dating

Hajdas

Ascough

Garnett

et al. 2021

Nat Rev Methods Primers

114

View full text Add to dashboard Cite

Radiocarbon dating uses the decay of a radioactive isotope of carbon ( 14 C) to measure time and date objects containing carbon-bearing material. With a half-life of 5,700 ± 30 years, detection of 14 C is a useful tool for determining the age of a specimen formed over the last 55,000 years. In this Primer, we outline key advances in 14 C measurement and instrument capacity, as well as optimal sample selection and preparation. We discuss data processing,

show abstract

Section: [H2] Equipment [H3] Beta-counting Techniquesmentioning

confidence: 99%

Radiocarbon dating

Hajdas

Ascough

Garnett

et al. 2021

Nat Rev Methods Primers

114

View full text Add to dashboard Cite

show abstract

“…After that, the melt began to decompose quickly (with a decrease of 80 wt.%) into released gaseous hydrocarbons and light hydrocarbons compounds in the form of pyrolysis vapors [48], followed by ash formulation and char devolatilization smoothly and slowly in the following regions till the end of the reaction [49]. As shown, PET fibers had a lower thermal stability compared to virgin PET due to its lower crystallinity and their bigger free space, which allowed the generated heat flux to penetrate this free space and break the Van der Waals bonds of the internal molecules of PET chains combined with several consecutive reactions (random chain scission, side group, and recombination), thus developing smaller molecules rich in gaseous hydrocarbon compounds [51,52]. This structure also led to changes in their chain size and this helped in the digestibility process and converting PET molecules into hydrocarbon and benzoic acid compound [48].…”

Section: Mechanism Of Pet Membrane Pyrolysismentioning

confidence: 99%

“…Higher heating rates enhanced the decarboxylation reaction and secondary cracking of carbonyl (-C=O-) and carboxyl (-COOH) groups, which contribute in the formation of greater CO2 and CO [54]. As shown, PET fibers had a lower thermal stability compared to virgin PET due to its lower crystallinity and their bigger free space, which allowed the generated heat flux to penetrate this free space and break the Van der Waals bonds of the internal molecules of PET chains combined with several consecutive reactions (random chain scission, side group, and recombination), thus developing smaller molecules rich in gaseous hydrocarbon compounds [51,52]. This structure also led to changes in their chain size and this helped in the digestibility process and converting PET molecules into hydrocarbon and benzoic acid compound [48].…”

Section: Chemical Analysis Of the Synthesized Volatile Products Using...mentioning

confidence: 99%

Pyrolysis Kinetic Behavior and Thermodynamic Analysis of PET Nonwoven Fabric

Yousef,

Eimontas,

Striūgas

et al. 2023

Materials

View full text Add to dashboard Cite

This research aims to maximize polyethylene terephthalate (PET) nonwoven fabric waste and make it as a new source for benzoic acid extraction using a pyrolysis process. The treatment was performed using a thermogravimetric analyzer (TGA) and released products were characterized using FTIR spectroscopy and gas chromatography–mass spectrometry (GC–MS). The pyrolysis kinetic and thermodynamic behavior of PET fabric was also studied and simulated using different linear and nonlinear models. The results show that the PET fabric is very rich in volatile matter (80 wt.%) and can completely degrade under 490 °C with a weight loss of 84%. Meanwhile, the generated vapor was rich in the carbonylic C=O functional group (FTIR), and the GC–MS analysis concluded that benzoic acid was the major compound with an abundance of 75% that was achieved at the lowest heating rate (5 °C/min). The linear kinetic results showed that PET samples had an activation energy in the ranges of 193–256 kJ/mol (linear models) and ~161 kJ/mol (nonlinear models). The thermodynamic parameters, including enthalpy, Gibbs free energy, and entropy, were estimated in the ranges of 149–250 kJ/mol, 153–232 kJ/mol, and 256–356 J/mol K, respectively. Accordingly, pyrolysis treatment can be used to extract benzoic acid from PET fabric waste with a 134% increase in the benzoic acid abundance that can be recovered from PET bottle plastic waste.

show abstract

“…AMS is the best and most widely used in large laboratories, yet its use is expensive. Other methods such as LSC can be considered cheaper to use but still reliable for accuracy [3].…”

Section: Introductionmentioning

confidence: 99%

Absorption of Carbon Dioxide into Potassium Hydroxide: Preliminary Study for its Application into Liquid Scintillation Counting Procedure

et al. 2021

View full text Add to dashboard Cite

This preliminary study presents a theoretical and experimental investigation on the absorption of CO2 into KOH solution. The study provides variation of KOH concentrations at 1, 2, 3, 4, and 5 N. The value of pH was observed for each increment of sample volume. The absorbed CO2 was measured by applying titration. The amounts of CO2 resulted from every provided KOH concentration were respectively 0.0075, 0.0075, 0.0232, 0.0305, and 0.0395 mol. The results reveal an increase in absorbed CO2 with each increment of KOH concentration. The absorption efficiency values of each KOH concentration were 0.3750, 0.4000, 0.3861, 0.3813, and 0.3950 mol total CO2/mol KOH, respectively. The difference values of experimental and theoretical absorbed CO2 may be caused by the formation of other compounds.

show abstract

Application of synthetic benzoic acid technology in environmental radiocarbon monitoring

Cited by 6 publications

References 23 publications

Radiocarbon dating

Radiocarbon dating

Pyrolysis Kinetic Behavior and Thermodynamic Analysis of PET Nonwoven Fabric

Absorption of Carbon Dioxide into Potassium Hydroxide: Preliminary Study for its Application into Liquid Scintillation Counting Procedure

Contact Info

Product

Resources

About