Synergistic mechanisms of novel Z-Scheme N,S co-doped biochar-based Ag3PO4 composites for efficient removal of norfloxacin

IF 10.4 1区 工程技术 Q1 ENGINEERING, CHEMICAL
Tongtong Wang, Amit Kumar, Gaurav Sharma, Sen Wang, Junchao Jia, Jiyong Zheng, Hui Shi
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Abstract

In this study, a novel N, S-co-doped carbon-based Ag3PO4 composite photocatalyst (N,S-Ag3PO4@ACB) was synthesized using activated biochar (ACB) as a carrier and used for the efficient removal of norfloxacin (NOR), a typical bio-refractory antibiotic. We systematically investigated the degradation effects, actual wastewater treatment, the impacts of environmental factors, and the degradation pathways. The results show that N,S-Ag3PO4@ACB is essentially a p-n heterojunction with Z-scheme of Ag2S/Ag3PO4/ACB composite containing Ag nanoparticles. After 120 min of irradiation, N,S-Ag3PO4@ACB removed 90.42% of an initial NOR concentration of 50 mg L–1. The activation of graphitic N and the lone electron pairs of N and S, promoted rapid photogenerated charge transfer. Furthermore, the surface properties of ACB promoted free radicals generation, and the surface plasmon resonance effect of the Ag nanoparticles synergistically enhanced the photocatalytic activity. A new degradation intermediate of NOR was identified, and the degradation dynamics were elucidated with three main pathways.

Abstract Image

新型 Z-Scheme N、S 共掺生物炭基 Ag3PO4 复合材料高效去除诺氟沙星的协同机制
本研究以活性生物炭(ACB)为载体,合成了一种新型的N、S-掺杂碳基Ag3PO4复合光催化剂(N,S-Ag3PO4@ACB),并将其用于高效去除典型的生物难降解抗生素诺氟沙星(NOR)。我们系统地研究了降解效果、实际废水处理情况、环境因素的影响以及降解途径。结果表明,N,S-Ag3PO4@ACB 本质上是一个 p-n 异质结,Z 型的 Ag2S/Ag3PO4/ACB 复合材料含有 Ag 纳米颗粒。辐照 120 分钟后,N,S-Ag3PO4@ACB 清除了初始 NOR 浓度(50 mg L-1)的 90.42%。石墨化 N 的活化以及 N 和 S 的孤电子对促进了快速的光生电荷转移。此外,ACB 的表面特性促进了自由基的产生,而 Ag 纳米粒子的表面等离子共振效应则协同增强了光催化活性。研究发现了一种新的 NOR 降解中间体,并阐明了三种主要的降解途径。
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来源期刊
npj Clean Water
npj Clean Water Environmental Science-Water Science and Technology
CiteScore
15.30
自引率
2.60%
发文量
61
审稿时长
5 weeks
期刊介绍: npj Clean Water publishes high-quality papers that report cutting-edge science, technology, applications, policies, and societal issues contributing to a more sustainable supply of clean water. The journal's publications may also support and accelerate the achievement of Sustainable Development Goal 6, which focuses on clean water and sanitation.
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