Experimental and theoretical study on dissociative photoionization of cyclopentanone

Li, Zhaohui; Yu, Ye-peng; Lin, Xuan; Chen, Jun; Zhang, Hang; Li, Yanbo; Wang, Huanhuan; Meng, Qinghui; Sun, Ruirui; Shan, Xu; Liu, Fuyi; Sheng, Liusi

doi:10.1063/1674-0068/31/cjcp1804084

Cited by 5 publications

(2 citation statements)

References 20 publications

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“…The smaller the RSD is, the higher the accuracy of the method. The precisions of the three determination methods for the sludge protein obtained by different hydrolysis processes were all less than 0.05, which meets the experimental requirements of precision (Li and Zhang, 2000).…”

Section: Precision Testssupporting

confidence: 58%

“…BSA was used as the standard protein, and standard addition recovery tests were performed to calculate the recovery rate. Studies have shown that a recovery rate of standard addition between 95% and 105% meets the test requirements (Li and Zhang, 2000). As seen from the Supplementary Information and table A.2, the recovery rates of both the Lowry and BCA methods were between 95% and 105% for the protein solutions obtained by all hydrolysis methods, indicating that the accuracy and reliability of the Lowry and BCA methods were excellent; in contrast, the recovery rate of the Bradford method had a large deviation and did not indicate high credibility in determining the protein content in sludge.…”

Section: Spiked Recovery Testsmentioning

confidence: 99%

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Comparison of methods for detecting protein extracted from excess activated sludge

Yan

Zhang

Gao

et al. 2023

Environ Sci Pollut Res

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Currently, the protein content of hydrolyzed sludge supernatant is commonly determined by the Kjeldahl method, but this method suffers from complicated operation, a long time requirement and large chemical consumption. In this paper, the Lowry, bicinchoninic acid (BCA) and Bradfordmethods were used to test the precision and spiked recovery of protein from sludge supernatant hydrolyzed by alkaline-thermal hydrolysis (ATH), enzymatic hydrolysis (EH) and ultrasound-assisted enzymatic hydrolysis (UEH), and the results were compared with those obtained with the Kjeldahl method. For all the hydrolysis processes, the sludge protein values determined from the three tested methods were within 0.05 of each other, meeting the experimental requirements for accuracy. Both the Lowry and BCA methods had a recovery rate of 95%-105%, while the Bradford method showed a large deviation and was not highly reliable. The three protein determination methods had signi cant differences from the Kjeldahl method (P<0.05). However, the relative deviation between the Kjeldahl and BCA methods was the smallest (3%-5%), followed by those between the Kjeldahl and the Lowry (11%-21%) and Bradford methods (21%-90%), and the causes of the deviation were analyzed according to the protein hydrolysate components and the mechanisms of the different detection methods. On the basis of the above results, the BCA method was chosen as the most appropriate quanti cation method for use in sludge protein extraction, and it was used to analyze the protein content extracted from residual sludge from two sewage treatment plants. The reliability of the method was veri ed, which lays a foundation for the extraction and reclamation of sludge protein.

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Section: Precision Testssupporting

confidence: 58%

Section: Spiked Recovery Testsmentioning

confidence: 99%

Comparison of methods for detecting protein extracted from excess activated sludge

Yan

Zhang

Gao

et al. 2023

Environ Sci Pollut Res

View full text Add to dashboard Cite

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Kinetics and Dynamics of Cyclopentanone Thermal Decomposition in Gas Phase

Priya,

Halder,

Paranjothy

2024

ChemPhysChem

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Cyclopentanone is a potential bio‐fuel which can be produced from bio‐mass. Its gas phase dissociation chemistry has attracted several experimental and theoretical investigations. In the photochemical and thermal decomposition studies of cyclopentanone, ethylene and carbon monoxide were found to be dominant reaction products along with several other compounds in smaller quantities. For the formation of ethylene and carbon monoxide, a concerted mechanism has been proposed as primary reaction pathway. In addition, a step‐wise mechanism involving ring‐opened radical intermediate has also been considered. The present work reports gas phase thermal decomposition of cyclopentanone at high temperatures investigated using electronic structure theory methods, Rice‐Ramsperger‐Kassel‐Marcus (RRKM) rate constant calculations, and Born‐Oppenheimer direct classical trajectory simulations. The trajectory calculations were performed on density functional PBE96/6‐31+G* potential energy surface using initial conditions selected from fixed energy normal mode distributions. Simulations showed that ethylene and carbon monoxide formed primarily via the concerted mechanism confirming the earlier predictions. In addition, stepwise pathways were also observed for same products in lower fraction of trajectories. Furthermore, several other reaction products in smaller quantities and new mechanistic pathways were observed. The computed RRKM rate constants and simulation data are agreement with experimental results and detailed atomic level dissociation mechanisms presented.

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Investigation into reactions of methyl methacrylate and ethyl acrylate with chlorine atom

Lin

et al. 2019

Chemosphere

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Experimental and theoretical study on dissociative photoionization of cyclopentanone

Cited by 5 publications

References 20 publications

Comparison of methods for detecting protein extracted from excess activated sludge

Comparison of methods for detecting protein extracted from excess activated sludge

Kinetics and Dynamics of Cyclopentanone Thermal Decomposition in Gas Phase

Investigation into reactions of methyl methacrylate and ethyl acrylate with chlorine atom

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