| Type of dopants used(x,y) | Optimum molar ratio of the dopants (Mx : My) | Codoped TiO2 preparation method | Starting material of TiO2 | Starting material of co-dopants | Particle size (nm) | Phase | BET surface area (m2/g) | Reference |
| F, N | 1.00 | Sol gel | TTIP | NH4F, NH4Cl | — | Anatase | 102.00 | [74] | Sm, N | 1.50 | Coprecipitation | Ti(SO4)2 | Sm(NO3)3, NH3 | 8.80 | Anatase/Rutile | 170.00 | [96] | Fe, Nb | 0.12 | Sol gel | TTIP | Fe(NO3)3•9H2O, C4NH4NbO9•10H2O | 10.00 | Anatase | 120.20 | [97] | W, N | 1.60 | Hydrolysis | TiCl4 | (NH4)2WO4 | 11.00 | Anatase | 80.00 | [98] | B, Fe | 3.00 | Sol gel | Ti(OBu)4 | H3BO3, Fe(acac)3 | 12.00 | Anatase | 60.00 | [99] | N, S | 1.00 | Hydrolysis | Ti(SO4)2 | NH3•H2O, Ti(SO4)2 | 38.20 | Anatase | 56.10 | [100] | S, I | 1.00 | Sol gel | TIP | Thiourea, HIO3 | 8.80 | Anatase | 85.00 | [101] | N, S | 33.33 | Hydrothermal | Ti(SO4)2 | CH4N2S, Ti(SO4)2 | 16.20 | Anatase | — | [102] | Cu, S | 2.00 | Sol gel | TIP | CuCl2•2H2O, Thiourea | 8.00 | Anatase | — | [103] | F, N | 1.00 | Sol gel | TiCl4 | NH4F | 11.90 | Anatase | 160.70 | [104] | Pt, Cu | 12.50 | Impregnation | Titanium Tetraisobutyloxide | H2PtCl6, Cu(NO3)2 | 8.90 | Anatase | 105.90 | [105] | Fe, C | 0.57 | Sol gel/Solvothermal | Tetrabutyl titanate | Fe(NO3)3•9H2O | 10.80 | Anatase | 158.00 | [106] | Pt, N | 0.02 | Sol gel | TTIP | H2PtCl6, NH2CONH2 | 5.00 | Anatase | 72.50 | [107] | Cr, W | 2.00 | Pyrolysis | Ti2(C2O4)3•10H2O | (NH4)2Cr2O7, Dimethylammonium tungstate | 30.00 | Anatase | 60.00 | [108] |
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