سجاد نظري

Removing carbon dioxide as a member of greenhouse gas and industrial gases has been one of the challenging topics for researchers. The increase in industrial activities has caused this gas to enter the atmosphere and increase the temperature of the earth, so different methods are used to collect and remove this gas. Surface absorption is one of the most efficient methods to remove carbon dioxide. Various types of adsorbents such as zeolites, metal-organic frameworks and porous polymers and various carbon-based structures for the surface absorption of carbon dioxide have been of interest to researchers. In this thesis, the performance of polyaniline polymer and its composite with activated carbon is investigated based on the use of surface absorption method, and the issue of carbon dioxide gas sensing by this polymer is investigated. For the synthesis of the mentioned polymer, the method of oxidation of aniline in hydrochloric acid (HCl) solution with the presence of ammonium persulfate (APS) as an oxidizing agent and with equal proportions in terms of moles was used. An advanced laboratory system with a batch reactor was used to measure the amount of carbon dioxide absorption and to check the operating conditions such as temperature and pressure. In this research, various characterization methods such as FTIR (Infrared Spectroscopy), XRD (X-ray Diffraction Spectrometer) were used in order to investigate the elements and bonds of the material and to eva‎luate the microscopic morphology. The highest absorption capacity for PAni/AC composite at 25 degrees Celsius and 9 bar pressure was obtained with a value of 11.2 mmol/g, which is improved compared to PAni. Also, kinetic and isotherm studies were performed for three adsorbents. Important thermodynamic parameters were calculated, which indicate the exothermic and spontaneity of the absorption process. At the end of the research, the results of measuring the ability of polyaniline in carbon dioxide sensing are given. The sensor results with a response percentage of 29.63 indicate the acceptable performance of this material in this test.

gas absorption , carbon dioxide , polyaniline , carbon dioxide detectiob , polyaniline synthesis

Sajad Nazari

Dr. Farrokhzad Dr. Ghaemi