Piezoelectric activation of peroxymonosulfate by MoS2 nanoflowers for the enhanced degradation of aqueous organic pollutants,Environmental Science: Nano

当前位置： X-MOL 学术 › Environ. Sci.: Nano › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Piezoelectric activation of peroxymonosulfate by MoS2 nanoflowers for the enhanced degradation of aqueous organic pollutants
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2021-2-9 , DOI: 10.1039/d0en01237h
Shuhui Liu _{1,

2,

3,

4,

5} , Binghua Jing _{1,

2,

3,

4,

5} , Chunyang Nie _{1,

2,

3,

4,

5} , Zhimin Ao _{1,

2,

3,

4,

5} , Xiaoguang Duan _{6,

7,

8,

9} , Bo Lai _{10,

11,

12,

13,

14} , Youyuan Shao _{14,

15,

16,

17} , Shaobin Wang _{6,

7,

8,

9} , Taicheng An _{1,

2,

3,

4,

5}

Affiliation

Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control
Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control
School of Environmental Science and Engineering
Institute of Environmental Health and Pollution Control
Guangdong University of Technology
School of Chemical Engineering and Advanced Materials
University of Adelaide
Adelaide
Australia
College of Architecture & Environment
Department of Environment Science & Engineering
Sichuan University
Chengdu 610065
China
School of Chemical Engineering and Energy Technology
Dongguan University of Technology
Dongguan 523808

Natural mechanical energies, such as wind, tidal waves, and water flow, widely exist in the environment and these inexhaustible natural mechanical energies can be utilized through piezoelectric materials for the degradation of aqueous organic pollutants in the environment. In this work, few-layered molybdenum disulfide nanoflowers (MoS₂ NFs) were adopted as a piezocatalyst to activate peroxymonosulfate (PMS) with ultrasonic waves (US) as the mechanical force for phenol abatement. A much higher degradation efficiency was attained by the integrated US/MoS₂ NFs/PMS system compared to other single systems, revealing the markedly synergistic effect of US and MoS₂ on PMS activation. Moreover, density functional theory calculations were performed to fundamentally understand the charge distribution in a polarized MoS₂ nanosheet under different strains and to understand the piezocatalytic properties of MoS₂ nanosheets, as well as reaction pathways between PMS and carriers on the active edges of MoS₂ for the production of free radicals. It was found that both sulfate radicals (SO₄˙⁻) and hydroxyl radicals (˙OH) were produced in the US/MoS₂ NFs/PMS system. However, SO₄˙⁻ was quickly converted into ˙OH via a hydrolysis reaction under US, enabling ˙OH to be the primary reactive oxygen species for phenol oxidation. This work offers an efficient piezocatalyst to activate persulfate for water remediation. More importantly, it provides fundamental insights into the piezoelectricity in two-dimensional semiconducting materials and the mechanism in the piezocatalytic activation of persulfate. Results prove that the combination of piezoelectricity and advanced oxidation processes is promising for water pollution control, and provides a new idea for the application of inexhaustible natural mechanical energy in the environment for environmental remediation.

中文翻译：

MoS2纳米花对过氧单硫酸盐的压电活化作用，可促进水性有机污染物的降解

环境中广泛存在自然机械能，例如风，潮汐和水流，这些不可取尽的自然机械能可通过压电材料利用，以降解环境中的水性有机污染物。在这项工作中，采用层数很少的二硫化钼纳米花（MoS ₂ NFs）作为压电催化剂，以超声波（US）作为消除苯酚的机械力来活化过氧一硫酸盐（PMS）。与其他单个系统相比，集成的US / MoS ₂ NFs / PMS系统获得了更高的降解效率，显示出US和MoS ₂的显着协同效应在PMS激活上。此外，进行密度泛函理论计算以从根本上了解极化的MoS ₂纳米片在不同应变下的电荷分布，并了解MoS ₂纳米片的压电催化性能，以及PMS与MoS ₂活性边缘上的载体之间的反应途径。用于生产自由基。结果发现，硫酸两个基团（SO ₄ ˙ ^{- ）}和羟基自由基（OH），在美国/ MOS制作_2个NFS / PMS系统。然而，SO ₄ ˙ ^-被迅速转化成OH经由在US条件下发生水解反应，使˙OH成为酚氧化的主要活性氧。这项工作提供了一种有效的压电催化剂来活化过硫酸盐以修复水。更重要的是，它为二维半导体材料中的压电性以及过硫酸盐的压电催化活化机理提供了基本的见识。结果证明，压电和先进的氧化工艺相结合对于水污染的控制是有希望的，并为取之不尽的自然机械能在环境修复中的应用提供了新思路。

更新日期：2021-02-24

点击分享查看原文

点击收藏

阅读更多本刊最新论文