FUEL
·
2024
·
IF 6.7
Ziqi Zhao,Fuxi Bao,Jiawen Wang,Zongli Gu,Yanbing Huang,Chaocao Cao,Yidan Yuan,Changhong Sun,Wen Guo
Alkaline water electrolysis driven by sustainable energy is a viable approach for large-scale green hydrogen production. The development of non-precious metal-based electrocatalysts that combine high activity and stability for the alkaline oxygen evolution reaction (OER) is of great importance. In this work, we design and construct a δ-FeOOH/NiMn 2 S 4 /NF heterointerface using a solvothermal/calcination process followed by a facile successive ionic layer adsorption reaction (SILAR) treatment. Experimental tests indicate that the formation of the heterogeneous interface between the δ-FeOOH and the NiMn 2 S 4 creates a good electron transport channel for an efficient electrocatalytic process and improves the charge transfer kinetics. As a result, the prepared δ-FeOOH/NiMn 2 S 4 /NF exhibits a low overpotential of 210 mV at 10 mA cm −2 and a low Tafel slope value of 46.6 mV dec −1 , and satisfactory stability with a 92.9 % retention after 72 h of OER operation at around 100 mA cm −2 . In situ Raman and in-situ attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR) tests show that the introduction of δ-FeOOH inhibits the oxidation of Ni 2+ to Ni 3+ and stabilizes the Ni-S bond to prevent its auto-oxidation, leads to an increase in the electrocatalytic OER activity.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Huixuan Zhang,Jinning Wang,Xinyi Zhang,Bo Li,Xiuwen Cheng
In the present study, a novel Co 3 O 4 /δ-FeOOH composite was successfully fabricated. Subsequently, we measured its crystal structure, morphology, and surface area. After this, the Co 3 O 4 /δ-FeOOH composite was applied to activate peroxymonosulfate (PMS) for lomefloxacin (LOM, a type of fluoroquinolones) degradation. Compared with pure Co 3 O 4 and δ-FeOOH, Co 3 O 4 /δ-FeOOH composite exhibited the best efficiency towards LOM degradation, in which the removal of LOM (>82%) and first order reaction kinetic rate constant (k app = 0.064 min −1 ) were achieved after 25 min reaction with 0.25 g·L −1 Co 3 O 4 /δ-FeOOH, 0.49 mM PMS, and 10 mg·L −1 (28.5 μM) LOM at initial pH 6.08. Next, we considered the concentration of catalyst, PMS and the effect of pH on LOM degradation. The results showed that the increase of PMS and catalyst was beneficial for the degradation of LOM. Moreover, the highest degradation efficiency of LOM was achieved under neutral conditions, which was due to the minimum repulsive force between the PMS and the catalyst. In addition, active radical scavenging experiment was performed and it was found that the contribution of hydroxyl radicals was greater than that of sulfate radicals. Subsequently, possible reaction mechanism was proposed. What’s more, possible degradation intermediates in Co 3 O 4 /δ-FeOOH system were determined and five decomposition pathways were proposed. Meanwhile, activated sludge inhibition experiment was carried out to evaluate the variation of toxicity of the LOM and its degradation intermediates in the oxidation process. Overall, this work provided a new strategy for the practical application of sulfate radicals-based advanced oxidation processes (SR-AOPs) in wastewater treatment.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Food Analytical Methods
·
2025
·
IF 3
Na Guanqiong,Chen Ping,Qian Yanya,Meng Danqun,Liu Zhipeng,Shan Yujuan
Traditional fluorescent immunosensors usually suffer from high background signals in food samples, which significantly reduces their detection sensitivity. In this study, δ-iron oxyhydroxide (δ-FeOOH) nanosheets with anti-bacitracin zinc (BAC) monoclonal antibodies (mAb) were conjugated as fluorescence receptors, while amino-functionalized carbon quantum dots (CQDs) as fluorescence donors for BAC. A novel fluorescence immunoassay was developed that eliminated background noise based on the “turn on” principle. Upon introduction of BAC into the sample, the nano-assembled probe showed an increase in fluorescence recovery, leading to higher fluorescence intensity at elevated BAC concentrations. This strategy exhibited a linear response for BAC concentrations ranging from 5 to 40 ng/mL, with a limit of detection (LOD) of 2.04 ng/mL. Our findings present a promising immunological approach for the sensitive and selective detection of BAC residues in food.
研究领域:
分析化学
·
食品科学
·
生物医学工程
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产品关联
DOI
高影响因子
TALANTA
·
2019
·
IF 4.916
Tian Wu,Xiang Li,Yuanqi Fu,Xuelian Ding,Zhongjian Li,Guifen Zhu,Jing Fan
Developing the high selectivity and sensitivity strategy for nucleic acid detection is crucial for early diagnosis and therapy of diseases. In this work, a novel low back-ground fluorescent sensor platform for the detection of nucleic acid has been developed based on δ-FeOOH nanosheets integrating with exonuclease III-assisted target-recycling signal amplification. Because of the strong binding ability between the single-strand DNA (ssDNA) and the δ-FeOOH nanosheets, the dye-labeled ssDNA probe would be quenched by δ-FeOOH nanosheets through fluorescence resonance energy transfer (FRET). By using magnetic separate properties of δ-FeOOH, the background signal was separated from the sensor system, and the low background sensor system was obtained. After adding the target DNA, a double-strand DNA complex (dsDNA) would be formed between the target DNA and dye-labeled ssDNA probe. Then, the dye-labeled ssDNA probe in the dsDNA complex would be stepwise hydrolyzed into short fragments from 3′-terminus by Exonuclease III, and the fluorescence signal was recovered due to the weak bind affinity between the short fragments and δ-FeOOH nanosheets. By using the fluorescence quenching ability of δ-FeOOH nanosheets and enzyme-assisted target-recycling signal amplification, this strategy could show an excellent selectivity toward hepatitis C virus DNA with a low detection limit of 10 pM. By simply changing the dye-labeled ssDNA probe sequence, this sensing platform can be developed as a universal approach for the simple, sensitive, and selective detection of different target DNA.
研究领域:
生物技术
·
分子生物学
·
分析化学
·
病毒学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Lina Zhou,Xingwang Zhang,Lecheng Lei
The δ-FeOOH/γ-Al 2 O 3 composite were prepared under mild conditions by the activated alumina absorption of Fe 2+ followed by rapid oxidation by H 2 O 2 . The δ-FeOOH growing on γ-Al 2 O 3 was composed of nanoneedles , forming a 3D flower-like morphology with a diameter of ~10 nm to provide a large number of active sites. The effects of Fenton reaction conditions, such as catalyst dosage, H 2 O 2 concentration, phenol concentration, initial pH value and temperature, on the catalytic activity of δ-FeOOH/γ-Al 2 O 3 were investigated. Under the optimal conditions, about 97.4% of phenol and 81.6% of total organic carbon (TOC) were removed in 5 min and 2 h, respectively. In addition, with γ-Al 2 O 3 as macroscopic size carrier (the diameter of 1–2 mm), the catalyst could be easily reused 10 runs with no significant reduction in catalytic activity. The possible mechanism was discussed, and it revealed that OH· was the main active species for degradation of phenol into intermediates and further into CO 2 and H 2 O. The δ-FeOOH/γ-Al 2 O 3 also showed high catalytic activity and reusability in the treatment of real industrial wastewater , making it a promising catalyst for industrial application.
研究领域:
环境科学
·
化学工程
·
催化
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 13
·7269-7279
·
IF 2.936
Junyu Fan,Zhiwei Zhao,Zhaoxia Ding,Jie Liu
In this study, different crystalline structures of FeOOH have been prepared. α-FeOOH was synthesized through a hydrothermal method, whereas β-FeOOH was synthesized via a direct hydrolysis method. Moreover, γ- and δ-FeOOH were prepared by precipitation methods through slow and quick oxidation, respectively. On this basis, their crystal structure, morphology, and surface area were measured. Then, all the synthesized materials were applied to activate peroxymonosulfate (PMS) to generate sulfate radicals (SO4−˙) for acid orange 7(AO7) degradation. Compared with α-FeOOH, β-FeOOH, and γ-FeOOH, δ-FeOOH showed more efficient decolorization of AO7 in the catalytic system because of its abundant surface area and crystalline structure. The effects of several parameters in the δ-FeOOH/PMS/AO7 system were investigated. The results show that the initial pH, which is related to the features of surface hydroxyl groups, is the decisive factor, and excellent catalytic activity is maintained in the pH range 5–8. The increase of catalyst dosage and appropriate increase of PMS concentration contributed to promote the degradation effect. However, self-quenching was observed in a high PMS concentration system. Moreover, δ-FeOOH was stable after six consecutive cycles, and the leaching of iron ions was negligible. According to the quenching test and electron spin resonance analysis, both SO4−˙ and ˙OH were the dominant radicals for AO7 degradation.
研究领域:
环境科学
·
催化
·
水处理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）