Preparation of core-shell structured Cu2O@NH2-MIL-125(Ti) MOF and efficient photocatalytic degradation of methylene blue

Cu2O has garnered increased interest due to its ideal band gap and excellent carrier separation efficiency for photo catalysis; nonetheless, charge recombination still causes instability in practical usage. Here we design and fabricate Truncated cube Cu2O(T C)@NH2-MIL-125(Ti) core-shell. The main bonds formed between NH2-MIL- 125(Ti) and T C are through the - N - Cu - N - , - N - O - Cu - bond and the Cu-O surface interaction in addition formed. The Truncated cube shape of Cu2O as a core and NH2-MIL-125(Ti) shell with limited recombination is seldom researched. The rate constant (K) for the photocatalytic methylene blue degradation of Cu2O (T C)@NH2-MIL-125(Ti) was 0.0182 min- 1 , 3.35 times higher than that of pure TC. The closely spaced band structures and close contact surfaces between T C and NH2-MIL-125(Ti) should be the origin of the core-shell's increased photocatalytic activity, as they facilitate the efficient transfer and separation of the photo-generated charge carriers. Cu2+ proportion to Cu1+ after core-shell preparation is 45.66 %, which causes more oxygen vacancy and charge imbalances, increasing reactant adsorption and light absorption in the visible spectrum. The stability test towards MB employing T C@NH2-MIL-125(Ti) core-shell and the photocatalytic scavenger test have also been studied. Moreover, a Type-II heterojunction was produced by photo-generated electron transfer from T C to NH2-MIL-125(Ti). Such a heterostructure sheds light on Cu2O-related core-shell materials' exceptionally effective recombination suppression and improved photocatalytic effectiveness.