Constructing a direct Z-scheme La2NiO4/g-C3N4 hybrid photocatalyst with boosted visible light photocatalytic activity

摘要: Abstract A mediator-free direct Z-scheme La2NiO4/g-C3N4 hybrid photocatalyst was successfully constructed by a facile mixed-calcination route and applied for the photocatalytic degradation of methyl orange (MO) in aqueous solution at room temperature under visible light irradiation (λ > 420 nm). Noticeably, all hybrids illustrated significantly boosted performances compared to individual La2NiO4 g-C3N4. More importantly, optimal theoretical mass fraction 3.3% revealed highest apparent photodegradation rate constant, which nearly 4.14 3.42 times larger than that pristine g-C3N4, respectively. Such remarkably augmented catalytic activity could be mainly ascribed formation an all-solid-state system composed not only separation efficiency photogenerated electrons holes but also possessed splendid oxidation reduction ability superior activity. Furthermore, active species trapping experiments demonstrated (h+) superoxide radicals ( O−2) were predominant reaction process. Finally, tentative mechanism responsible charge proposed based on results energy band positions, experiment photoluminescence spectroscopy.