Guest Molecule Insertion-Optimized d-Band Center Position in MoS₂ with Improved Sulfite Activation Ability Inspired by Sulfite Oxidase

Abstract

As a prospective member in the family of advanced oxidation processes (AOPs), heterogeneous sulfite activation shows low cost and high safety for poisonous organic pollutants’ degradation. To obtain an efficient sulfite activator, sulfite oxidase (SuO x ), a molybdenum-based enzyme that can prompt oxidation and activation of sulfite, inspired us greatly. Based on the structure of SuO x , MoS 2 /BPE (BPE = 1, 2-bis-(4-pyridyl)-ethylene) is synthesized successfully. In MoS 2 /BPE, the BPE molecule is inserted between the MoS2 layers as a pillar and the N atom links with Mo4+ directly. MoS 2 /BPE shows excellent SuO x mimic activity. Theoretical calculation implies that BPE insertion optimizes the d-band center position of MoS 2 /BPE, which regulates the interaction between MoS2 and *SO4 2–. This prompts •SO4 – generation and organic pollutants’ degradation. At pH 7.0, its tetracycline degradation efficiency achieved is 93.9% in 30 min. Furthermore, its sulfite activation ability also endows MoS 2 /BPE with excellent antibiofouling performance because •SO4 – can kill the microorganisms in water effectively. This work develops a new sulfite activator based on SuO x . The connection between structure and SuO x mimic activity and sulfite activation ability is clarified in detail.

Construction of Mo-Based p–n Heterojunction with Enhanced Oxidase–Mimic Activity for AOPs and Antibiofouling

“…To achieve this goal, we focus on the nanozyme with oxidase-mimic activity, which can convert O 2 to ·OH directly and oxidize a lot of organic compounds. − In this process, O 2 in the air serves as a ·OH provider directly and no other additives (such as above-mentioned H 2 O 2 , PS, and PMS) are required . This unique merit makes the nanozyme with oxidase-mimic activity become a potential selection for AOPs to remove organic pollutants in water. , MoS 2 shows promising oxidase-mimic activity and has been used in environmental monitoring, disease therapy, as well as biosensing successfully. − Furthermore, as a nanomaterial, MoS 2 not only inherits the activity of natural oxidase but also has a low price . To remove organic pollutants in water with the AOP method, ·OH at high concentrations usually receives good results .…”

“…22−24 Furthermore, as a nanomaterial, MoS 2 not only inherits the activity of natural oxidase but also has a low price. 25 To remove organic pollutants in water with the AOP method, •OH at high concentrations usually receives good results. 26 In this aspect, the oxidase-mimic activity of MoS 2 requires further improvement.…”