CHEMICAL ENGINEERING JOURNAL
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2018
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IF 6.735
Yanping Zhu,Runliang Zhu,Yunfei Xi,Tianyuan Xu,Lixia Yan,Jianxi Zhu,Gangqiang Zhu,Hongping He
The conventional heterogeneous Fenton reaction is often confined by the lower regeneration of Fe 2+ , which then inhibits the decomposition of H 2 O 2 and the generation of OH. Here we propose a novel idea to significantly accelerate the redox cycling of Fe 2+ /Fe 3+ in heterogeneous Fenton reaction by introducing photo-generated electrons from plasmonic particles. Towards this aim, novel plasmonic Ag/AgCl nanoparticles coated ferrihydrite (Ag/AgCl/Fh) have been synthesized. Compared with pure Fh, a remarkable enhancement in the photo-Fenton degradation towards bisphenol (BPA) can be observed for all Ag/AgCl/Fh samples under visible light. Noticeably, the rate constant of 6%Ag/AgCl/Fh is 0.0506 min −1 , which is about 5.1 times as high as that of pure Fh (0.0099 min −1 ). Moreover, the catalytic activity of 6%Ag/AgCl/Fh on the degradation of BPA remains quite efficient with a low Fe leaching after 4 recycles. The results of the effect of initial pH indicates that Ag/AgCl/Fh samples exhibit relatively high photo-Fenton catalytic activity even at pH 6. The electron spin resonance (ESR) analysis reveals that OH plays a significant role in the photo-Fenton reaction. The concentration of OH can even reach 267.6 μmol/L after 60 min, which is much higher than that of pure Fh (69.2 μmol/L). The measurement of Fe 2+ concentration and the XPS Fe2p spectra of Ag/AgCl/Fh before and after the degradation of BPA indicate the loading of Ag/AgCl can accelerate the conversion of Fe 3+ /Fe 2+ by the photo generated electrons from Ag nanoparticles due to the surface plasmon resonance (SPR) effect under the visible light irradiation.
研究领域:
环境科学
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催化
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材料科学
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光化学
✓ 已验证
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
Zihua Wang,Chijia Wang,Weihao Fan,Shuyi Liu,Kaka Li,Hongxin Luo,Shupei Liu,Huaiyuan Wang
A robust bifunctional platform (FA-PANI-Fe-F) with both shielding performance and corrosion inhibition activity was prepared and observed for its structure and morphology. During the corrosion test , Fe 2+ /Fe 3+ and perfluorinated groups effectively strengthened the shielding performance and corrosion inhibition activity of the coating. The results show that the perfluorinated group not only improved the hydrophobic performance of the functional filler but also provided effective inhibition against corrosion for the anode area. In addition, Fe 2+ /Fe 3+ resulted in the functional filler exhibiting anodic protection and cathodic inhibition properties, thereby forming a dense metal passivation film between the coating and the substrate interface. After the EIS test, the |Z| 0.01 Hz value of FPF-Fe 10% C still reached 7.91 × 10 8 Ω·cm 2 . Additionally, the FPF-Fe 10% C showed a lower cathodic corrosion trend in the SVET test, which indicated that Fe 2+ /Fe 3+ effectively inhibited the corrosion process in the cathode region. This study is expected to open new insights into the anti-corrosion inhibition process between the interior of the coating and the metal substrate, and prepare a robust bifunctional filler platform with long-term corrosion resistance .
研究领域:
材料科学
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腐蚀工程
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表面化学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Science
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2024
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IF 14.3
Rui Qiao,Zhongwen Yuan,Meijin Yang,Zhiying Tang,Lizhen He,Tianfeng Chen
Exploring efficient and low-toxicity radiosensitizers to break through the bottleneck of radiation tolerance, immunosuppression and poor prognosis remains one of the critical developmental challenges in radiotherapy. Nanoheterojunctions, due to their unique physicochemical properties, have demonstrated excellent radiosensitization effects in radiation energy deposition and in lifting tumor radiotherapy inhibition. Herein, they doped selenium (Se) into prussian blue (PB) to construct a nano-heterojunction (Se@PB), which could promote the increase of Fe 2+ /Fe 3+ ratio and conversion of Se to a high valence state with Se introduction. The Fe 2+ -Se-Fe 3+ electron transfer chain accelerates the rate of electron transfer on the surface of the nanoparticles, which in turn endows it with efficient X-ray energy transfer and electron transport capability, and enhances radiotherapy physical sensitivity. Furthermore, Se@PB induces glutathione (GSH) depletion and Fe 2+ accumulation through pro-Fenton reaction, thereby disturbs the redox balance in tumor cells and enhances biochemical sensitivity of radiotherapy. As an excellent radiosensitizer, Se@PB effectively enhances X-ray induced mitochondrial dysfunction and DNA damage, thereby promotes cell apoptosis and synergistic cervical cancer radiotherapy. This study elucidates the radiosensitization mechanism of Se-doped nanoheterojunction from the perspective of the electron transfer chain and biochemistry reaction, which provides an efficient and low-toxic strategy in radiotherapy.
研究领域:
纳米技术
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肿瘤学
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放射治疗
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材料科学
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生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
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2021
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IF 7.086
Chongqing Wang,Ruirui Sun,Rong Huang,Yijun Cao
Hydrogen peroxide activation by pyrite for degradation of recalcitrant contaminants receives increasing attention. The improvement of catalytic efficiency of natural pyrite is still a challenging issue. This work provides a novel strategy of enhancing catalytic efficiency via pre-reaction between pyrite and hydrogen peroxide. Effects of process factors including pre-reaction time, hydrogen peroxide, solution pH and initial dye concentration were examined. Natural pyrite with low purity was characterized by Raman, scanning electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. Reaction kinetic verifies tremendous improvement of the reaction rate through pre-reaction. Enhanced dye degradation is ascribed to hydroxyl radical production promoted by self-regulation of pH, Fe 2+ releasing and Fe 2+ /Fe 3+ cycle. The plausible mechanism was proposed based on multiple determinations. Dye degradation in different water matrix was efficiently obtained, as well as multicomponent dyes. Additionally, broad operation pH and good reusing performance make the developed process highly attractive for application. This work provides a solid step-forward of pyrite/hydrogen peroxide Fenton process for treatment of recalcitrant contaminants in wastewater.
研究领域:
环境科学
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化学工程
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废水处理
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催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Water Process Engineering
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2024
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IF 6.3
Jiayang Huang,Yunchang Xie,Chunhui Dai,Hao Cui,Chao Zeng
Sulfidated FeOCl is prepared as a heterogeneous photo-Fenton catalyst. And the surface sulfidation of FeOCl can remarkably accelerate the photoinduced charge separation and transfer, while also increase Fe 2+ /Fe 3+ atomic ratio, leading to the boosted photo-Fenton activity in the presence of H 2 O 2 . Under irradiation of natural sunlight (light intensity: ∼80 mW·cm −2 ), over 10 mg sulfidated FeOCl catalyst with using 20 μL 15 % H 2 O 2 , 91.2 % of ofloxacin solution (50 mg·L −1 ) and 97.5 % of sulfisoxazole solution (60 mg·L −1 ) can be degraded in 80 min, and 99.6 % of phenol solution (625 mg·L −1 ) is decomposed in 4 h. Under irradiation of a white Light-Emitting Diode (LED) lamp (light intensity: 5 mW·cm −2 ), 99.8 % of ofloxacin solution is decomposed after treatment for 4 h. Moreover, this photo-Fenton degradation system displays a stable activity in a wide range of pH (1−10), diverse water bodies, and various coexisting ions with concertation from 1 mM to 500 mM. Moreover, sulfidated FeOCl catalyst coated on a frosted glass sheet exhibits excellent stability for degrading ofloxacin even in seven continuous cycles. Particularly, the non-toxicity of the treated ofloxacin, sulfisoxazole, and phenol solution, have been proven by testing their toxic effects on cabbage seed, bacteria, and human embryonic kidney cell, respectively.
研究领域:
环境科学
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催化
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光化学
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水处理
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材料科学
✓ 已验证
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
Hui He,Yuexin Wang,Juan Li,Shanliang Jiang,Subhan Sidra,Wenxue Gong,Ying Tang,Yang Hu,Rule Wei,Dongxiao Yang,Xuesheng Li,Zhongxing Zhao
High light adsorption and fast charge separation are crucial for photo-Fenton catalytic activity of MOFs. Herein, bottom-up design was proposed to fabricate polypyrrole (PPy C ) nanowires in MIL-88B(Fe) cages as photo-Fenton catalyst for Sulfamethoxazole (SMX) efficient degradation. Pyrrole was prior anchored into MIL-88B(Fe) cluster via Fe-N coordination, and then the additional monomer pyrrole was further triggered bottom-up polymerization in confined cages of MIL-88B(Fe) and formed PPy C @Py-MIL(Fe) composite. These PPy C nanowires were dispersed in Py-MIL(Fe) cages and tightly connected with MOFs clusters via Fe-N bonding. Characterization proved that: (1) Interfacial Fe-N can significantly promote the efficient electron transport from PPy C nanowires to Py-MIL(Fe), enhance optical absorption property, and construct strong Lewis acidic sites and ligand vacancies in PPy C @Py-MIL(Fe). (2) The confined PPy C nanowire via Fe-N connection remarkably promote photo-generated electron-hole separation, Fe 2+ |Fe 3+ redox ability of MOF, and improved photo-electric corrosion ability. As a result, it significantly enhanced the photo-Fenton catalytic performance for SMX degradation. Catalytic oxidation was attributed to the generation of ‧OH species that oxidized 93% SMX in 60 min, showing ultra-rapid degradation and TOC removal rates of 33.7 min −1 ·mg·g −1 and 8.68 min −1 ·mg·g −1 respectively, which was about 4–220 times higher than those reported state-of-the-art catalysts. Additionally, the PPy C @Py-MIL(Fe) catalyst showed minimal loss in catalytic activity even after recycling for 10 times, exhibiting good recycling stability compared to many MOFs. Systematic analysis shown that in-situ anchored growth of polypyrrole in confined porous cages of MOF can effectively enhance the catalytic activity and stability of MIL-88B(Fe), and has great development potential applications for photo-Fenton catalytic degradation of organic pollutants.
研究领域:
环境科学
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材料科学
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催化
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水处理
✓ 已验证
产品关联
DOI
高影响因子
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