Metal free MoS₂ 2D sheets as a peroxidase enzyme and visible-light-induced photocatalyst towards detection and reduction of Cr(vi) ions

Abstract

Two-dimensional molybdenum disulphide (MoS2) sheets were prepared by using a simple thermal decomposition method.

The age of bioinspired molybdenum‐involved nanozymes: Synthesis, catalytic mechanisms, and biomedical applications

“…A number of bottom-up and top-down approaches including exfoliation (e.g., liquid exfoliation, ultrasonic exfoliation, and chemical exfoliation), hydrothermal/solvothermal synthesis, thermal decomposition as well as pulsed laser ablation can be used to synthesize Mo-based nanozymes (Table 1). 40,41,[53][54][55] Herein, representative methods for synthesis of Mobased nanozymes are presented. Multiple MoS 2 NSs with a few layers can be extensively produced by exfoliation of bulk MoS 2 .…”

“…Therefore, detections of the toxic substances are major and long-standing problems. Some metal ions (e.g., Hg 2+ , Cu 2+ , Cr 6+ , and Fe 2+ ) 40,68,116,117 and organic compounds (e.g., phenol, perfluorooctane sulfonate, trinitrotoluene, triacetone triperoxide [TATP] explosives, and carbendazim [CBZ]) in wastes and foods 53,55,69,75,118 have been detected by Mo-based nanozymes. For example, a field-portable and colorimetric sensor for the visual detection of Hg 2+ has been constructed using safe chitosan-modified MoSe 2 NSs (CS-MoSe 2 NSs) nanozyme (Figure 8D).…”

“…33 MoS 2 and MoSe 2 are typical members of two-dimensional (2D) graphenelike transition metal dichalcogenides (TMDCs). 37,38 Strategies for synthesis of Mo-based nanozymes include exfoliation, 35 hydrothermal/solvothermal synthesis, 27,39 thermal decomposition, 40 and pulsed laser ablation. 41 These strategies can control the physicochemical properties of nanozymes such as phase structure, morphology, surface modification, and size, consequently affecting their enzyme-like activities.…”

Metal–Organic Framework MIL-101(Fe) Nanoparticles Decorated with Ag Nanoparticles for Regulating the Photocatalytic Phenol Oxidation Pathway for Cr(VI) Reduction

“…6,7 Photocatalysis has been commonly used to reduce Cr(VI) and degrade phenol with comparatively lower concentrations; [8][9][10][11][12] photo-induced electrons are thought as the main active species for Cr(VI) reduction. [13][14][15][16] Therefore, photocatalysts with high activity generally have enhanced hole-electron separation efficiency. [17][18][19][20][21][22] This case is not vice versa since the electron-induced Cr(VI) reduction requires efficient surface adsorption of anion Cr(VI) on the photocatalyst, which restricts the photocatalysts with low isoelectric points to strongly acid conditions.…”

Peroxidase‐Mimetic and Fenton‐Like Activities of Molybdenum Oxide Quantum Dots

“…Owing to the advantages of cost-saving in preparation and purification, high stability against stringent conditions and strong resistance to denaturation, nanomaterials are considered to be a kind of promising artificial enzymes. [1,2] Until now, numerous nanomaterials have been reported to possess intrinsic enzyme-mimetic activity similar to that of natural enzymes, such as metal organic framework, [3] silver nanoparticles, [4] carbon materials, [5,6] cupric oxide nanoparticles, [7] LaNiO 3 nanocubes, [8] VO x nanoflakes, [9] PtCu bimetallic nanoparticle, [10] Fe 3 O 4 nanoparticle, [11] MoS 2 2D sheets, [12] and so on.…”