Separations
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2025
·Vol. 12
·期 4
·101
·
IF 2.7
Jiren Yuan,Dongao Xie,Dan Li,Feigao Xu
In recent years, the rapid development of industry has led to the discharge of large quantities of pollutants, including harmful dyes, into water sources, thereby posing potential threats to human health and the environment. FeOCl and biochar have their own shortcomings as a mediator in the heterogeneous Fenton process. To make both materials useful, FeOCl supported on bamboo biochar (FeOCl/BC) was prepared by calcination using FeCl3·6H2O and bamboo powder as raw materials, and the composite’s catalytic activities were explored with acid orange II (AO-II) as the target pollutant. The degradation efficiency of FeOCl/BC composites on AO-II was determined by testing the mass ratio of FeOCl and BC, initial pH, temperature, H2O2concentration, catalyst addition, addition of coexisting inorganic anions, and natural organic matter. The addition of biochar to FeOCl increased the activation of H2O2to generate •OH for the removal of AO-II and accelerated the cycle of Fe3+/Fe2+. The removal rate of AO-II by the Fe1C0.2composite was 97.1% when the mass ratio of FeOCl and BC was 1:0.2 (Fe1C0.2), which was higher than that of the pure components (FeOCl or BC) at pH = 6.1. Moreover, after five reuses, the Fe1C0.2composite still showed high degradation activity for AO-II, with 83.3% degradation and low activity loss. The capture experiments on the active material showed that the removal of AO-II by the Fe1C0.2composite was mainly dominated by •OH; however, •O2−andh+played minor roles. The synthesized Fe1C0.2composite could be applied for organic contaminants such as AO-II with high removal efficiency.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Water Cycle
·
2022
·
IF 0
Wen-Min Wang,Xinzheng Li,Xin Du,Qian-Yuan Wu
Azo dyes, which are widely used in the textile industry, are typical toxic and refractory pollutants in wastewater. Heterogeneous Fenton oxidation is effective in degrading organic compounds; however, it may induce Fe-leaching. Therefore, it is necessary to find efficient, cheap, and natural iron mineral catalysts for heterogeneous Fenton oxidation. This work aimed to investigate the removal of the representative azo dye reactive yellow 3 (RY3) by iron mineral/H 2 O 2 oxidation. Compared with hematite and pyrite, magnetite showed superior RY3 degradation efficiency via heterogeneous Fenton oxidation. The optimum parameters for degradation of 50 mg/L RY3 by magnetite/H 2 O 2 were 0.2 g/L magnetite, 0.5 mM H 2 O 2 , and pH 3.5. Under the optimum parameters, RY3 was almost completely degraded within 40 min. Through free radical trapping experiments, hydroxyl radicals (•OH) were identified as the dominant reactive radical species for RY3 degradation by magnetite/H 2 O 2 oxidation.
研究领域:
环境科学
·
化学工程
·
材料科学
✓ 已验证
DOI
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2025
·
IF 8.4
Shitong Liu,Junwu Liu,Jun Wang,Yang Liu,Baojun Yang,Maoxin Hong,Shichao Yu,Guanzhou Qiu,Yingchun Fang
Loading catalysts onto carriers to prepare supported catalysts is an important strategy for improving dispersion, stability and catalytic performance. In this study, we synthesized a supported red mud (RM)-based Fe-Co Prussian blue analogue (RM-Co PBA) catalyst using RM as iron source and carrier by acid dissolution-reduction-coprecipitation method to activate H 2 O 2 for the degradation of ciprofloxacin (CIP). The RM-Co PBA obtained under the synthesis conditions of HCl concentration of 2.4 M and potassium cobalt cyanide addition of 4 mM exhibited the best dispersibility and regular shape, resulting in high catalytic performance. The degradation efficiency of RM-Co PBA/H 2 O 2 system reached 75.79% in 10 min, which was 10.54 times and 1.21 times of that of RM/H 2 O 2 system and Fe-Co PBA/H 2 O 2 system, respectively. The RM-Co PBA/H 2 O 2 system was almost unaffected by pH and was suitable for treating low concentration CIP wastewater. Additionally, the system can be reused well and possessed certain resistance to inorganic anions. The results showed that superoxide radical (⋅O 2 − ) was the main ROS attacking CIP, which accumulated continuously in the cycling process of Co(III)/Fe(III) and Co(II)/Fe(II). On the other hand, the presence of a large number of oxygen vacancies in RM-Co PBA enhanced the production of ⋅O 2 − by endowing it with good electron transfer performance. Finally, we proposed possible CIP degradation pathways and demonstrated the toxicity reduction of each pathway by a quantitative structure-activity relationship analysis. This study provides guidance for the resource utilization of RM and the efficient treatment of antibiotic wastewater.
研究领域:
环境科学
·
化学工程
·
水处理技术
·
催化
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS ES&T Water
·
2025
·
IF 4.3
Ting Li,Xiqing Wang,Xin Du,Murong Wang,Jianru Liang,Lixiang Zhou
The widespread application of Fe-based heterogeneous Fenton in water treatment is hindered by two main challenges: the inefficiency of the Fe(III)/Fe(II) redox cycle and the requirement of acidic conditions. In this study, combining schwertmannite with iron phosphide (Sch/FeP) via pre-adding FeP in the formation process of Sch could enhance the Fe(II)/Fe(III) conversion and self-producing acidic environment by SO42– substitution. Specifically, the inclusion of FeP in the Sch/FeP composite markedly increased the content of ≡Fe(II) species, thereby improving the activation of H2O2 to produce substantial quantities of •OH and •O2– radicals. Sch/FeP-driven heterogeneous Fenton exhibited high total organic carbon (TOC) removal (∼60%) and utilization efficiency of H2O2 (100%) after 20 min. Furthermore, Sch/FeP exhibited excellent degradation performance across a broad pH range (2–10), which could be attributed to the SO42– substitution reaction. This study not only addresses critical challenges in heterogeneous Fenton processes but also provides a novel strategy for modifying sulfate minerals to enhance their environmental applicability.
研究领域:
环境化学
·
催化
·
水处理
·
材料科学
·
高级氧化工艺
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）