Adsorption Properties of Comb-Shaped Polycarboxylate Dispersant onto Different Crystal Pyraclostrobin Particle Surfaces
The stability of the suspension system of the two crystal forms of pyraclostrobin is evaluated using multiple light technology, and the adsorption performance of polycarboxylate dispersant on the surface of two different crystalline pyraclostrobin particles is compared in combination with XRD, FTIR,...
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doaj-19b33620e3b441c891d059ce77630b672020-12-01T00:01:35ZengMDPI AGMolecules1420-30492020-11-01255637563710.3390/molecules25235637Adsorption Properties of Comb-Shaped Polycarboxylate Dispersant onto Different Crystal Pyraclostrobin Particle SurfacesLiying Wang0Chong Gao1Jianguo Feng2Yong Xu3Danqi Li4Lixin Zhang5Institute of Functional Molecules, Shenyang University of Chemical Technology, Shenyang 110142, ChinaInstitute of Functional Molecules, Shenyang University of Chemical Technology, Shenyang 110142, ChinaSchool of Horticulture and Plant Protection, Yangzhou University, Yangzhou 225009, ChinaInnovation Center of Pesticide Research, Department of Applied Chemistry, College of Science, China Agricultural University, Beijing 100193, ChinaInstitute of Functional Molecules, Shenyang University of Chemical Technology, Shenyang 110142, ChinaInstitute of Functional Molecules, Shenyang University of Chemical Technology, Shenyang 110142, ChinaThe stability of the suspension system of the two crystal forms of pyraclostrobin is evaluated using multiple light technology, and the adsorption performance of polycarboxylate dispersant on the surface of two different crystalline pyraclostrobin particles is compared in combination with XRD, FTIR, XPS, and SEM from the microscopic view. The adsorption kinetics and thermodynamics studies of 2700 on the surfaces of different crystalline forms of pyraclostrobin particles show that the adsorption process of 2700 on the surfaces of pyraclostrobin crystal forms II and IV conform to pseudo-second-order kinetic adsorption model. The <i>E</i>a values for crystal forms II and IV are 12.93 and 14.39 kJ∙mol<sup>−1</sup>, respectively, which indicates that both adsorption processes are physical adsorption. The adsorption models of 2700 on the surfaces of pyraclostrobin crystal forms II and IV are in accordance with Langmuir adsorption isotherms. The <b>∆</b><i>G</i><sub>ad</sub> values of crystal forms II and IV are negative and the <b>∆</b><i>S</i><sub>ad</sub> values are positive at different temperatures. Therefore, the adsorption processes are spontaneous and accompanied by entropy increase. The results of this study provide an important theoretical basis for the selection of polycarboxylate dispersants in the suspension of pyraclostrobin. This study also provides a reference for the research of polycrystalline pesticide suspension concentrate.https://www.mdpi.com/1420-3049/25/23/5637pyraclostrobincrystal formpolycarboxylate dispersantstabilityadsorption |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Liying Wang Chong Gao Jianguo Feng Yong Xu Danqi Li Lixin Zhang |
spellingShingle |
Liying Wang Chong Gao Jianguo Feng Yong Xu Danqi Li Lixin Zhang Adsorption Properties of Comb-Shaped Polycarboxylate Dispersant onto Different Crystal Pyraclostrobin Particle Surfaces Molecules pyraclostrobin crystal form polycarboxylate dispersant stability adsorption |
author_facet |
Liying Wang Chong Gao Jianguo Feng Yong Xu Danqi Li Lixin Zhang |
author_sort |
Liying Wang |
title |
Adsorption Properties of Comb-Shaped Polycarboxylate Dispersant onto Different Crystal Pyraclostrobin Particle Surfaces |
title_short |
Adsorption Properties of Comb-Shaped Polycarboxylate Dispersant onto Different Crystal Pyraclostrobin Particle Surfaces |
title_full |
Adsorption Properties of Comb-Shaped Polycarboxylate Dispersant onto Different Crystal Pyraclostrobin Particle Surfaces |
title_fullStr |
Adsorption Properties of Comb-Shaped Polycarboxylate Dispersant onto Different Crystal Pyraclostrobin Particle Surfaces |
title_full_unstemmed |
Adsorption Properties of Comb-Shaped Polycarboxylate Dispersant onto Different Crystal Pyraclostrobin Particle Surfaces |
title_sort |
adsorption properties of comb-shaped polycarboxylate dispersant onto different crystal pyraclostrobin particle surfaces |
publisher |
MDPI AG |
series |
Molecules |
issn |
1420-3049 |
publishDate |
2020-11-01 |
description |
The stability of the suspension system of the two crystal forms of pyraclostrobin is evaluated using multiple light technology, and the adsorption performance of polycarboxylate dispersant on the surface of two different crystalline pyraclostrobin particles is compared in combination with XRD, FTIR, XPS, and SEM from the microscopic view. The adsorption kinetics and thermodynamics studies of 2700 on the surfaces of different crystalline forms of pyraclostrobin particles show that the adsorption process of 2700 on the surfaces of pyraclostrobin crystal forms II and IV conform to pseudo-second-order kinetic adsorption model. The <i>E</i>a values for crystal forms II and IV are 12.93 and 14.39 kJ∙mol<sup>−1</sup>, respectively, which indicates that both adsorption processes are physical adsorption. The adsorption models of 2700 on the surfaces of pyraclostrobin crystal forms II and IV are in accordance with Langmuir adsorption isotherms. The <b>∆</b><i>G</i><sub>ad</sub> values of crystal forms II and IV are negative and the <b>∆</b><i>S</i><sub>ad</sub> values are positive at different temperatures. Therefore, the adsorption processes are spontaneous and accompanied by entropy increase. The results of this study provide an important theoretical basis for the selection of polycarboxylate dispersants in the suspension of pyraclostrobin. This study also provides a reference for the research of polycrystalline pesticide suspension concentrate. |
topic |
pyraclostrobin crystal form polycarboxylate dispersant stability adsorption |
url |
https://www.mdpi.com/1420-3049/25/23/5637 |
work_keys_str_mv |
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1724411300973379584 |