Improving the Photocatalytic Activity of TiC MXene by Surface Modification of N Doped.

Methyl orange dye (MO) is one of the azo dyes, which is not only difficult to degrade but also hazardous to human health, therefore, it is necessary to develop an efficient photocatalyst to degrade MO. In this paper, a facile and low-cost elemental doping method was used for the surface modification of TiC MXene, i.e., nitrogen-doped titanium carbide was used as the nitrogen source, and the strategy of combining solvent heat treatment with non-in situ nitrogen doping was used to prepare N-TiC MXene two-dimensional nanomaterials with high catalytic activity. It was found that the catalytic efficiency of N-TiC MXene materials was enhanced and improved compared to the non-doped TiC MXene. In particular, N-TiC 1:8 MXene showed the best photo-catalytic ability, as demonstrated by the fact that the N-TiC 1:8 MXene material successfully degraded 98.73% of MO (20 mg/L) under UV lamp irradiation for 20 min, and its catalytic efficiency was about ten times that of TiC MXene, and the N-TiC photo-catalyst still showed good stability after four cycles. This work shows a simplified method for solvent heat-treating non-in situ nitrogen-doped TiC MXene, and also elaborates on the photo-catalytic mechanism of N-TiC MXene, showing that the high photo-catalytic effect of N-TiC MXene is due to the synergistic effect of its efficient charge transfer and surface-rich moieties. Therefore, N-TiC MXene has a good prospect as a photo-catalyst in the photocatalytic degradation of organic pollutants.