N-doped biochar-Fe/Mn as a superior peroxymonosulfate activator for enhanced bisphenol a degradation

IF 11.4 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Water Research Pub Date : 2025-03-01 DOI:10.1016/j.watres.2025.123399

Huiji Xiao , Yun Wang , Kewei Lv , Chenxi Zhu , Xiaohong Guan , Bing Xie , Xiaoming Zou , Xubiao Luo , Yanbo Zhou

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Abstract

Emerging contaminants (ECs) are characterized by their widespread environmental distribution and low concentrations, posing significant challenges for their effective removal from source wastewater. To better deal with the problems associated with ECs, we developed a robust Fe-Mn bimetallic catalyst supported on N-doped biochar (FM@NBC-8) for peroxymonosulfate (PMS)-mediated advanced oxidation system, in which bisphenol A (BPA) was investigated as a typical EC. Particularly, complete degradation of BPA in the FM@NBC-8/PMS system was achieved within 5 min, accompanying with a high TOC removal. The degradation rate of BPA with FM@NBC-8 was 143 times that of the initial biochar (BC-8), 20 and 91 times that of single metal-doped catalysts Fe (F@NBC-8) and Mn (M@NBC-8), respectively. The degradation rate of BPA was enhanced to 1.7337 min^⁻¹ with 0.6 g L^⁻¹ FM@NBC-8 utilized to activate PMS, achieving a superior performance in BPA degradation compared to most reported results in the literature (0.081∼1.43 min^⁻¹). The introduction of Fe, Mn, and N elements dramatically enhanced the specific surface area (from 46.285 to 218.541 m² g^⁻¹) of the catalyst, thereby enhancing the adsorption capacity of PMS and pollutants on the catalyst. Moreover, the accelerated electron transfer between the catalyst and PMS favored the formation of low-valent metal intermediates (Fe(II)-O-O-SO₃⁻ and Mn(II)-O-O-SO₃⁻), responsible for the generation of SO₄^•−and ^•OH. And ¹O₂ was generated mainly via the decomposition of SO₅^•− in FM@NBC-8/PMS system, thereby collectively enhancing the pollutant degradation. The stability of the catalyst was attributed to the synergistic effects of nitrogen doping and biochar encapsulation, which ensured effective operation of the FM@NBC-8/PMS system across a broad pH range of 3 to 10, while also providing resistance to interference from ubiquitous anions. This study indicates that the bimetal biochar-based materials for catalytic PMS activation have significant potential for practical application in green environmental remediation.

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n掺杂生物炭- fe /Mn作为强化双酚a降解的优良过氧单硫酸盐活化剂

新兴污染物（ECs）具有环境分布广泛、浓度低的特点，对其从源废水中有效去除提出了重大挑战。为了更好地解决与EC相关的问题，我们开发了一种坚固的Fe-Mn双金属催化剂，负载在n掺杂生物炭（FM@NBC-8）上，用于过氧单硫酸盐（PMS）介导的高级氧化系统，其中双酚a （BPA）作为典型的EC进行了研究。特别是，在FM@NBC-8/PMS系统中，BPA在5分钟内完全降解，并伴随着高TOC的去除。FM@NBC-8对BPA的降解率是初始生物炭（BC-8）的143倍，是单金属掺杂催化剂Fe （F@NBC-8）和Mn （M@NBC-8）的20倍和91倍。BPA的降解率提高到1.7337分钟毒血症，0.6 g L - 1 FM@NBC-8用于激活PMS，与文献中大多数报道的结果（0.081 ~ 1.43分钟毒血症）相比，BPA的降解率更高。Fe、Mn、N元素的加入显著提高了催化剂的比表面积（从46.285增加到218.541 m2 g - 1），从而提高了催化剂对PMS和污染物的吸附能力。此外，催化剂和PMS之间加速的电子转移有利于形成低价金属中间体(Fe(II)-O-O-SO3−和Mn(II)-O-O-SO3−)，负责生成SO4•−和•OH。而1O2主要通过FM@NBC-8/PMS系统中SO5•−的分解生成，从而共同增强了污染物的降解。催化剂的稳定性归功于氮掺杂和生物炭包封的协同作用，这确保了FM@NBC-8/PMS系统在3到10的广泛pH范围内有效运行，同时还提供了抵抗无处不在的阴离子干扰的能力。该研究表明，催化PMS活化的双金属生物炭基材料在绿色环境修复中具有重要的实际应用潜力。

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来源期刊

Water Research 环境科学-工程：环境

CiteScore

20.80

自引率

9.40%

发文量

1307

审稿时长

38 days

期刊介绍： Water Research, along with its open access companion journal Water Research X, serves as a platform for publishing original research papers covering various aspects of the science and technology related to the anthropogenic water cycle, water quality, and its management worldwide. The audience targeted by the journal comprises biologists, chemical engineers, chemists, civil engineers, environmental engineers, limnologists, and microbiologists. The scope of the journal include: •Treatment processes for water and wastewaters (municipal, agricultural, industrial, and on-site treatment), including resource recovery and residuals management; •Urban hydrology including sewer systems, stormwater management, and green infrastructure; •Drinking water treatment and distribution; •Potable and non-potable water reuse; •Sanitation, public health, and risk assessment; •Anaerobic digestion, solid and hazardous waste management, including source characterization and the effects and control of leachates and gaseous emissions; •Contaminants (chemical, microbial, anthropogenic particles such as nanoparticles or microplastics) and related water quality sensing, monitoring, fate, and assessment; •Anthropogenic impacts on inland, tidal, coastal and urban waters, focusing on surface and ground waters, and point and non-point sources of pollution; •Environmental restoration, linked to surface water, groundwater and groundwater remediation; •Analysis of the interfaces between sediments and water, and between water and atmosphere, focusing specifically on anthropogenic impacts; •Mathematical modelling, systems analysis, machine learning, and beneficial use of big data related to the anthropogenic water cycle; •Socio-economic, policy, and regulations studies.