Viny Alfiyah. Adsorption behavior of air-pollution gases on boron nitride nanotubes for gas sensing and storage. Master's Degree(Chemistry). Chulalongkorn University. Office of Academic Resources. : Chulalongkorn University, 2023.
Adsorption behavior of air-pollution gases on boron nitride nanotubes for gas sensing and storage
Abstract:
Structures of pristine (5,5) and (10,0) BNNTs, their Al-, Ga-, Cr- and Fe-doping derivatives, and their adsorption structures with H2O, H2S, SO2, CO2, CO, NH3, N2O, and NO were explored using periodic DFT/PBEPBE/ method. N2O and SO2 adsorbed either on the Cr-(5,5) or Cr-(10,0) BNNT were found to be the strongest and the second-strongest adsorptions, respectively. N2O adsorption either on the Cr-(5,5) or Cr-(10,0) BNNT found as dissociative chemisorption is suggested as the catalyst for reductive conversion of N2O to N2 and O2 gases, of which overall reaction of -0.253 eV was found. Cr-(5,5) and Cr-(10,0) BNNTs are suggested as the catalyst for N2O conversion to N2 and O2 gases of which overall reaction of -0.253 eV. Based on band gap changes over 70% after gas adsorption and short recovery time, Al-(5,5) BNNT, Ga-(5,5) BNNT, Al-(10,0) BNNT, Ga-(10,0) BNNT as NO sensing materials are suggested. Based on adsorption strengths, Al-(5,5) BNNT, Ga-(5,5) BNNT, Al-(10,0) BNNT, Ga-(10,0) BNNT are suggested as NH3 storage materials.