Novel slow-release nanohybrid from zinc hydroxysalt intercalated with dicamba herbicide

IF 5.3 2区地球科学 Q2 CHEMISTRY, PHYSICAL Applied Clay Science Pub Date : 2023-11-01 DOI:10.1016/j.clay.2023.107114

Gabriela Oro , Renata Mello Giona , Nájila Mikaeli Pauli , Paulo Rodrigo Stival Bittencourt , Rodrigo Leonardo de Oliveira Basso , Cristiane Canan , Ana Cristina Trindade Cursino

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Abstract

Dicamba was intercalated by co-precipitation into a zinc-layered hydroxide salt (LHS) to create a slow-release nanohybrid weed control without leaching. The X-Ray Powder Diffractometry (XRPD) patterns of the LHS intercalated with dicamba showed a basal spacing of 20.48 Å and 26.10 Å, confirming its allocation as a monolayer and bilayer interdigitated arrangement, respectively. The Fourier Transformant Infrared (FTIR) spectrum showed bands typical of dicamba and provided information about its bridging bidentate coordination to the matrix layer. The thermogravimetric analysis (TGA) estimated the compound's formula as Zn₅(OH)₈(dicamba)₂·4.14H₂O. The thermal stability of the LHS/dicamba system, the stages of mass loss, the characterization of the compounds released in the pyrolysis, the activation energy (E_a), and the kinetics were all analyzed. The average activation energy for decomposition of intercalated dicamba indicates that the thermal degradation occurred with the breakage of covalent bonds. Controlled release of dicamba from its nanohybrid in water was observed for 962 h (40 days). The pseudo-second-order model described the release process satisfactorily from its linear fitting, suggesting intraparticle diffusion or surface diffusion control. In summary, the intercalation of dicamba in the zinc LHS produced a slow-release material that can aid in weed control.

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新型羟基锌盐插麦草畏除草剂缓释纳米杂化物

通过共沉淀将麦草畏嵌入到锌层氢氧化物盐(LHS)中，以创建一种缓释的纳米杂交杂草控制剂。x射线粉末衍射(XRPD)显示，插入麦草畏的LHS基间距分别为20.48 Å和26.10 Å，证实其为单层和双层交叉排列。傅里叶变换红外(FTIR)光谱显示麦草畏的典型波段，并提供了其与基质层桥接双齿配位的信息。热重分析(TGA)估计化合物的分子式为Zn5(OH)8(麦草畏)2·4.14H2O。分析了LHS/麦草畏体系的热稳定性、失重阶段、热解过程中释放的化合物特征、活化能(Ea)和动力学。插层麦草畏的平均分解活化能表明，热降解发生在共价键断裂的过程中。观察麦草畏纳米杂交种在水中的控释962 h (40 d)。伪二阶模型从线性拟合上很好地描述了释放过程，表明颗粒内扩散或表面扩散控制。综上所述，麦草畏嵌入锌LHS中产生了一种缓释物质，有助于杂草控制。

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来源期刊

Applied Clay Science 地学-矿物学

CiteScore

10.30

自引率

10.70%

发文量

289

审稿时长

39 days

期刊介绍： Applied Clay Science aims to be an international journal attracting high quality scientific papers on clays and clay minerals, including research papers, reviews, and technical notes. The journal covers typical subjects of Fundamental and Applied Clay Science such as: • Synthesis and purification • Structural, crystallographic and mineralogical properties of clays and clay minerals • Thermal properties of clays and clay minerals • Physico-chemical properties including i) surface and interface properties; ii) thermodynamic properties; iii) mechanical properties • Interaction with water, with polar and apolar molecules • Colloidal properties and rheology • Adsorption, Intercalation, Ionic exchange • Genesis and deposits of clay minerals • Geology and geochemistry of clays • Modification of clays and clay minerals properties by thermal and physical treatments • Modification by chemical treatments with organic and inorganic molecules(organoclays, pillared clays) • Modification by biological microorganisms. etc...