2D/2D g-C₃N₄/1T-MoS₂ Nanohybrids as Schottky Heterojunction Photocatalysts for Nuclear Wastewater Pretreatment

Abstract

Photocatalytic technologies are expected to solve the problem of organic matter pretreatment in nuclear wastewater to realize the sustainable development for energy and environment. However, the design and synthesis of the low-cost and high-efficiency photocatalysts are a significant challenge to achieve this goal. In this work, the 2D/2D g-C 3 N 4 /1T-MoS 2 Schottky heterojunction photocatalyst was prepared by a liquid-phase ultrasonic self-assembly method, and the enhanced carrier separation ability was proved by the electrochemical impedance spectroscopy, transient photocurrent, and photoluminescence spectra, which improved the photocatalytic quantum efficiency. The results suggested that the 2D/2D g-C 3 N 4 /1T-MoS 2 heterojunction not only has a satisfactory ability to treat tannic acid in nuclear wastewater but also has excellent removal effects on various dyes including methylene blue, rhodamine B, methyl violet, amaranth, and methyl orange. This work provides an effective approach to construct the 2D/2D Schottky heterojunctions for the application in photocatalytic spent fuel wastewater or industrial sewage treatment.

Synergistic Effect of the Sulfur Vacancy and Schottky Heterojunction on Photocatalytic Uranium Immobilization: The Thermodynamics and Kinetics

“…Generally, the pH of uranium-containing nuclear wastewater produced by the spent fuel cycle was weakly acidic, so the U­(VI) removal ratio of the samples at a pH of 2 to 7 was studied. According to Figure S3a, the optimal U­(VI) removal ratio (calculated by eq S1) appeared at pH = 5, which may be attributed to the different forms of the U­(VI) species (Figure S3b).…”

Tailor‐Engineered 2D Cocatalysts: Harnessing Electron–Hole Redox Center of 2D g‐C3N4 Photocatalysts toward Solar‐to‐Chemical Conversion and Environmental Purification

“…who fabricated 2D/2D 1T‐MoS 2 /g‐C 3 N 4 nanocomposite via facile ultrasonic self‐assembly method ( Figure a) and applied it in the environmental remediation application. [ 169 ] The formed 2D hybrid demonstrated excellent removal efficiency not only limited to the organic pollutants in industrial sewage, but also the tannic acid in nuclear wastewater with up to 91.7% removal efficiency. This was because the metal phase 1T MoS 2 as the electron acceptor led to effective charge diffusion and suppressed recombination rate.…”

“…Reproduced with permission. [ 169 ] Copyright 2021, American Chemical Society. b) Schematic illustration of the formation of MS/SCN‐x% composites.…”

“…Figure 9. a) Schematic diagram of 1T-MoS 2 /g-C3 N 4 nanocomposite via liquid-phase sonochemical self-assembly approach. Reproduced with permission [169]. Copyright 2021, American Chemical Society.…”

A well-defined S-g-C3N4/Cu–NiS heterojunction interface towards enhanced spatial charge separation with excellent photocatalytic ability: synergetic effect, kinetics, antibacterial activity, and mechanism insights

“…g-C 3 N 4 has gained excessive research consideration as a probable photocatalyst by scientists for a variety of applications. [20][21][22][23] It has various features necessary for photocatalysis reactions such as being non-toxic, chemically and thermally stable and visible light-responsive. 24 Similarly, due to the quick recombination of e À and h + couples, the photocatalytic activity of undoped g-C 3 N 4 is limited.…”