Ultrasound-assisted coating of silk yarn with nano-porous Co3(BTC)2·12H2O with iodine adsorption affinity

• Dense coatings of Co3(BTC)2·12H2O nanostructures on the silk fibers were achieved.
• The effects of ultrasound irradiation and sequential dipping steps in growth of the Co-BTC were studied.
• Results show a decrease in the particles size as decreasing sequential dipping steps.
• XRPD analyses indicated that the prepared Co-BTC on fiber were crystalline.
• A comparison of adsorption and desorption rates of iodine between samples was also conducted.

A porous coordination polymer, Co3(BTC)2·12H2O (Co-BTC) upon silk yarn, has been synthesized under ultrasound irradiation of identical reaction mixtures of Co(OAc)2·2H2O and H3BTC (BTC = 1,3,5-benzenetricarboxylate) at different conditions. In this work, we successfully loaded compounds with I2 by suspending them in an n-hexane solution of I2. The delivery of I2 from compounds in ethanol at room temperature was determined by UV/vis spectroscopy. In the nano-porous materials the surface area is decreased so that the amount of adsorption is decreased a little. So the delivery of iodine from the nano-porous materials can be faster than bulk materials but the amount of adsorbance is less. Effects of temperature, sequential dipping steps and sonication in growth of the Co-BTC upon silk yarn were studied. A comparison of adsorption and desorption rates of iodine between samples under various conditions was also conducted.

Schematic representation of the formation mechanism of nano-porous Co3(BTC)2·12H2O on natural silk surfaces.Figure optionsDownload as PowerPoint slide