فراز شعباني مقدم

Nanoclay is one of the most used and common additives in many industries such as composites, automotive, medicine, agriculture, packaging and drilling, which is not currently produced in iran with a suitable quality grade. The most common clay phase used in the above applications is montomorillonite, which can be found abundantly in bentonite soils. Due to existence of several bentonite mines in Iran and the high added value of the final product compared to its raw materials, the production of nanoclay has attracted many researchers. In this study, raw bentonite soils were selected from several Iranian mines and analyzed to select the most suitable soil for nanoclay synthesis. To remove or reduce disturbing impurities in the processes of synthesis and operation of nanoclay products, such as cristobalite, quartz, calcium carbonate, feldspar and hydroxides, the purification process was performed by ultrasonic treatment and use of dispersants with centrifugation and sedimentation routes. In the last step, the synthesis of organically modified clay was performed in order to improve the properties of clay and its industrial application with the help of two surface modifiers named cetyltrimethylammonium bromide and octadecylamine by two different methods. X-ray diffraction analysis, scanning electron microscopy and X-ray fluorescence analysis were used to eva‎luate the results at each stage. The purification process was quite successful with the removal of quartz, feldspar, calcium carbonate and relative reduction of cristobalite. Cation exchange capacity was increased from 69.44 meq/100g to 121.28 meq/100g after purification process. Also, the nanoclay synthesis process was successfully performed by increasing the interlayer distance from 12Å in raw bentonite to 35Å in the nanoclay sample. Also clay layers exfoliation was observed in the final samples.

نانورس , مونت موري لونيت , بنتونيت , تخليص رس , سنتز رس آلي

Nanoclay , Montmorillonite , Bentonite , Purification of clay , organoclay synthesis

Faraz Shaebani Moghadam

Dr. Mir Kazemi - Dr. Hajar Ghanbari