Homologous chemiluminescence resonance energy transfer on the interface of WS2 quantum dots for monitoring photocatalytic H2O2 evaluation.

• The homologous CRETproperty of WS 2 QD S was reported firstly. • WS 2 QD S -NaClO-H 2 O 2 system was employed to design CL method of H 2 O 2 detection. • The H 2 O 2 evolution of photocatalysts was evaluated by the proposed CL method. Water disinfection is a significant process in water treatment. As the widely used disinfection method, sodium hypochlorite (NaClO) disinfection has the potential carcinogenic risk because of its chloramine byproducts. Hence, the green and noncarcinogenic photocatalytic disinfection becomes a new favourite. In photocatalytic disinfection, H 2 O 2 with long lifetime and lasting antibacterial property plays a principal role. Therefore, monitoring H 2 O 2 in this process is imperative and challenging, which facilitated the development of efficient disinfection technique. Herein, a novel homologous chemiluminescence resonance energy transfer (CRET) on the interface of WS 2 QD S was designed to amplify the chemiluminescence (CL) emission of NaClO-H 2 O 2 system. Interestingly, energy donators and acceptors were originated from WS 2 QDs in this CRET system. In detail, W (IV) on the interface of WS 2 QD S were oxidized to W (VI) by NaClO, and then W (VI) combined with H 2 O 2 to generate in-situ reactive peroxotungstate. The unstable peroxotungstate rapidly decomposed to singlet oxygen (1O 2) and then dimerised to (1O 2) 2 * (a dimer of singlet oxygen). WS 2 QD S received the energy from (1O 2) 2 * to produce strong luminescence. Based on this mechanism, a new platform for H 2 O 2 determination with high selectivity and sensitivity was proposed and successfully applied to evaluate the photocatalytic properties of five two-dimensional materials by monitoring the photocatalytic H 2 O 2 evolution. This work deepens the understanding of the excellent property of WS 2 QDs. More constructively, it provides a novel idea for designing effective CRET and explores its potential application in photocatalytic research. [ABSTRACT FROM AUTHOR]