A study of B12N12 nanocage as potential sensor for detection and reduction of 2,3,7,8-tetrachlorodibenzodioxin

Abstract

The adsorption of the 2,3,7,8-tetrachlorodibenzodioxin (TCDD) molecule on the B₁₂N₁₂ nanocage (B₁₂N₁₂-NC) was studied by M06-2X/6-31++G** method. There are three sites for TCDD adsorption on B₁₂N₁₂-NC. The B–B atom pair in six-membered rings (B_(6MR)–B_(6MR)) of B₁₂N₁₂-NC is the preferable adsorption site. When TCDD approaches the B₁₂N₁₂ nanocage, electronic exchange between them occurs, and TCDD is converted to 3,4-dichlorophenol, 3-chloroprop-2-en-1-ol, and 1-chloroprop-1-ene. The HOMO/LUMO energy, energy gaps (E_g), thermodynamic properties, and structural deformation are calculated by DFT methods. The lowest value of E_g (3.796 eV) was obtained for TS-3 (the first transition state of conversion of intermediate 3,4-dichlorophenol to 3-chloroprop-2-en-1-ol and 1-chloroprop-1-ene). The Gibbs free energy and heat of reactions are negative; therefore, these reactions are favorable and spontaneous and make B₁₂N₁₂-NC suitable as nanosensor for TCDD detection and reduction.