Laboratoire « Eau, Energie et Environnement » (LR3E; code: LR99ES35), Ecole Naionale d'Ingénieurs de Sfax, Université de Sfax, B. P. W, 3038, Sfax, Tunisia.
Laboratoire de Génie Chimique, B6a, Université de Liège, 4000, Liège, Belgium.
Environ Sci Pollut Res Int. 2018 Jul;25(19):18251-18262. doi: 10.1007/s11356-017-9122-2. Epub 2017 May 13.
Essential oils from aromatic plants are currently mentioned as suitable tools for excellent protection of stored grains from insect pest attacks. The present work aimed to study the processes of the synthesis insecticidal formulation with clay. The active terpenic compounds of essential oil of Eucalyptus globulus (Eg) were fixed in the palygorskite by adsorption process. Two sample types of palygorskites were used: raw and organo-palygorskite. The palygorskite clays were characterized by different physicochemical techniques including X-ray diffraction (XRD), Fourier transform infrared (FTIR) analyses, thermogravimetric analysis (TG), differential thermal analysis (DTA), Brunauer-Emmet-Teller (BET), and scanning electron microscope (SEM). Results reveal that the raw clay has a fibrous structure with impurities essential calcite. These structures and physicochemical properties of raw palygorskite and organo-palygorskite give it the potential of material adsorbent. Results show that the adsorption capacity strongly depends on affinity between terpenic compounds and organic cations rather than on interlayer distance of organo-palygorskite. The highest adsorption capacity of terpenic compounds is acquired with palygorskite interlaced by didodecyldimethylammonium bromide (DDDMA). These results validated the potential utility of the Paly-DDDMA as adsorbent fibrous clay for the retention of terpenic compounds in application of environmental preservation.
芳香植物精油目前被认为是保护储存谷物免受虫害的绝佳工具。本工作旨在研究用粘土合成杀虫制剂的过程。通过吸附过程，将蓝桉精油（Eg）的活性萜类化合物固定在坡缕石中。使用了两种类型的坡缕石样品：原矿和有机坡缕石。通过 X 射线衍射（XRD）、傅里叶变换红外（FTIR）分析、热重分析（TG）、差热分析（DTA）、BET 和扫描电子显微镜（SEM）等不同的物理化学技术对坡缕石粘土进行了表征。结果表明，原矿具有纤维状结构，杂质主要为方解石。这些结构和原矿及有机坡缕石的物理化学性质赋予了它作为吸附材料的潜力。结果表明，吸附能力强烈取决于萜类化合物与有机阳离子之间的亲和力，而不是有机坡缕石的层间距。用二癸基二甲基溴化铵（DDDMA）交错的坡缕石获得了萜类化合物的最高吸附能力。这些结果验证了 Paly-DDDMA 作为纤维状粘土吸附剂在环境保存应用中保留萜类化合物的潜在用途。
