APPLIED CATALYSIS B-ENVIRONMENTAL
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2025
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IF 21.1
Qingfei Zhao,Zhenpeng Guo,Zhuohan Wu,Shuyuan Dong,Ronghao Kang,Bingdian Jiang,Shuhui Guan,Ting Zhang,Zhenfeng Bian
The advanced oxidation process (AOP) based on hydroxyl radical ( • OH) has garnered increasing attention in water purification and wastewater treatment. However, producing • OH by activating hydrogen peroxide (H 2 O 2 ) encounters the challenges associated with the sluggish kinetics of Fe(II) regeneration. Herein, we developed a carambola-like catalyst of boron (B)-doped TiO 2 mesocrystals-based iron catalyst (Fe-B-MST), which served as a photocatalyst to modulate the regeneration of Fe(II) in photo Fenton-like systems. We successfully used the electrospinning method to gain membrane and realised the remediation of different industrial wastewater. The Fe-B-MST catalyst exhibits excellent efficiencies in the oxidative degradation of 4-chlorophenol (4-CP) pollutants, effectively facilitating the production of • OH while minimising the formation of toxic byproducts, with the first-order kinetic constant ( k = 2.372 min −1 ) being approximately 6.1 times greater than that without B doping, and 19.8 times greater than that observed with commercial TiO 2 . Theoretical calculations and related physicochemical characterisation reveal that B occupies an interstitial site in titania, conferring a sufficiently high valence band potential, making it thermodynamically favourable for H 2 O 2 oxidation and weakening its interaction with • OH, consequently increasing higher reactivity toward the targeted organic pollutant. The B doping facilitates electron transfer, promotes rapid reduction of Fe(III) to Fe(II), and further enhances • OH production via a photo Fenton-like reaction. The oxidation reaction stoichiometry efficiencies were quantified for different organics and calculated to be in the range of 7.70–24.20 % in Fe-B-MST/H 2 O 2 vis. system, representing an enhancement of 1.18–1.54 times compared to Fe-MST/H 2 O 2 vis. , alongside the utilisation efficiency of H 2 O 2 ( η ) of Fe-B-MST/H 2 O 2 vis. is 1.37–1.67 fold greater than that of Fe-MST/H 2 O 2 vis. after 30 min of reaction. This study expands our understanding and provides valuable insights into applying photocatalysis for enhanced wastewater treatment.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2019
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IF 8.355
Lian Zhang,Yue Zhang,Xuyan Gao,Chunhua Xu
Recent studies showed that Fe(II) acts as the major electron donor when sulfidated zero-valent iron (S-ZVI) is used for reductive removal of pollutants. However, few studies have focused on the utilization efficiency and regeneration rate of Fe(II). In this work, the dynamic interaction between pH and S-ZVI for Cr(VI) removal and Fe(II) production was investigated at several pH levels. It was found that the maximum utilization efficiency and regeneration rate of Fe(II) was obtained at pH 5, which is consistent with the Cr(VI) removal by S-ZVI. To further study the role of Fe(II) in Cr(VI) reduction, an innovative binary correlation analysis between aqueous Cr(VI) and Fe(II) was applied with the addition of 1,10-phenanthroline as a way to control Fe(II) availability for Cr(VI) reduction. The analysis revealed that the Cr(VI) sequestration was initially controlled by Fe 0 /FeS and then by Fe(II), which accounts for the majority of the Cr(VI) sequestration. Additionally, the effects of several operational parameters (e.g., S/Fe ratio, S-ZVI dosage and initial concentration of Cr(VI)) on Cr(VI) removal were also evaluated and the results indicated that the removal of Cr(VI) exhibited a bimodal pattern with increasing S/Fe ratio, but followed a unimodal pattern with increase of S-ZVI dosage and chromium concentration. This study sheds additional insight into the dynamic interaction between pH and Fe(II), which is significant for further improving the efficiency of Fe(II) on contaminants.
研究领域:
环境科学
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化学工程
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Qizhan Zhang,Minghua Zhou,Xuedong Du,Pei Su,Wenyang Fu,Ge Song
To simultaneously improve the H 2 O 2 electrosynthesis, Fe(II) regeneration and pH application range in EF process, a highly efficient dual-cathode electro-Fenton (EF) process using easily available Fe(III) as catalysts for the treatment of organic wastewater at a wide pH range was first proposed, in which natural air diffusion electrode (NADE) was designed as one cathode for H 2 O 2 production without aeration and the modified carbon felt (MCF) was acted as the other cathode mainly for Fe(II) regeneration. Nitric acid modification significantly enhanced the electrochemical properties of CF and introduced more oxygen-containing functional groups. The Fe(II) regeneration rate of MCF with higher electroactive surface area was 4.7 times that of CF cathode at pH 7. It was found that as the homogeneous Fe(III) was hydrolyzed into solid hydroxides, the accompanying H + decreased the solution pH and MCF not only accelerated the dissolved Fe(III)/Fe(II) cycle but also reduced the adsorbed solid iron to ≡Fe(II) on the cathode surface. This simultaneously promoted the homogeneous and heterogeneous Fenton reactions and enhanced the efficiency of EF degradation process. For bronopol, 2,4-dichlorophenoxyacetic acid, sulfamethazine and phenol (100 mg L −1 ), the process had TOC removal of 48%−72% within 60 min with the corresponding mineralization current efficiency of 16.5%−56.2%, and the electrical energy consumption <0.225 kWh (gTOC) −1 , which all greatly advantaged over that of the conventional EF. Therefore, this process is efficient and low-cost, being very promising for the treatment of organic wastewater.
研究领域:
环境科学
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污水处理
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电化学技术
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Zhenglin Chen,Guangzhen Liu,Shuiping Yu,Lixia Yang,Lingyi Zheng,Zhihui Wei,Shenglian Luo
Cathode materials with high hydrogen peroxide (H 2 O 2 ) selectivity and Fe 2+ regeneration under macroneutral conditions are the essential for practical electro-Fenton processes. Herein, we develop an amorphous cobalt sulphide (CoSx(t = x)@Cu) cocatalytic electro-Fenton (EF) system capable of effectively degrading organic pollutants, such as sulfamethoxazole, at macroneutral pH conditions. Owing to the flexible electronic properties of amorphous structures and charge redistribution triggered by S defects, the optimum CoSx(t = 8)@Cu cathode successfully introduces H*/H + and promotes the in-situ evolution of H 2 O 2 . Additionally, an acidic microenvironment was constructed on the CoSx(t = 8)@Cu surface by the unreduced H*/H + , enabling a self-adjustment from alkalinity to acidity in the EF reaction without adding acid. Such self-adjustment effectually inhibits iron sludge production and promotes Fe 2+ regeneration, assuring 80% Fe 2+ cycling efficiency. More importantly, the EF system possesses outstanding stability and applicability for organic pollutant remediation regardless of water matrices. This work elucidates the intrinsic mechanism of amorphous electrocatalysts in overcoming the pH limitation of EF reactions, extending the applicability of Fenton technology.
研究领域:
环境科学
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化学工程
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材料科学
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水处理
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产品关联
DOI
高影响因子
Journal of Water Process Engineering
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2025
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IF 6.7
Danni Deng,Rong Chen,Qianqian Zhong,Binbin Xiong,Jia Deng,Na Zhang,Shiwei Xie
Bicarbonate ions (HCO 3 − ), commonly present in natural water sources, exert complex influences on peroxymonosulfate (PMS)-based advanced oxidation processes (AOPs). This study investigates the role of HCO 3 − in a novel electrochemical system using a stainless-steel scrubber cathode (SSSC) for PMS activation. The buffering effect of HCO 3 − shifts the dominant Fe(II) species from dissolved Fe 2+ ions to surface-bound Fe(II) (≡Fe(II)) within the HCO 3 − /PMS/SSSC system. Furthermore, HCO 3 − promotes ≡Fe(II)/≡Fe(III) redox cycling on the SSSC surface. These synergistic effects significantly enhance PMS activation, generating singlet oxygen ( 1 O 2 ) and Fe IV O as the primary oxidants responsible for BPA degradation. Identification of degradation intermediates elucidated two dominant pathways: hydroxylation and radical coupling. Toxicity assessment of these intermediates confirmed reduced environmental risks. The SSSC exhibited long-term stability and effective performance in real water matrices, demonstrating its practical applicability.
研究领域:
环境科学
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电化学
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水处理
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高级氧化技术
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材料科学
✓ 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）