Acta Biomaterialia
·
2023
·
IF 9.7
Yanan Xu,Weiqiang Wang,Fengyun Yu,Shuaikang Yang,Yonghui Yuan,Yinong Wang
Pure Fe is a potential biodegradable stent material due to its better biocompatibility and mechanical properties , but its degradation rate needs to be improved. Alloying with Zn to form Fe-Zn alloy is anticipated to meet the degradation rate requirements while retaining the iron's inherent properties. Therefore, Fe-Zn alloys with monolayered and multilayered structures were prepared by electrodeposition . The alloys' composition, microstructure, mechanical properties, in vitro degradation and biocompatibility were assessed. Results showed that the Zn content ranged from 2.1 wt% to 11.6 wt%. After annealing at 450°C, all the alloys consisted of α(Fe) solid solution and Zn-rich B2 ordered coherent phase, except for the alloy with 11.6 wt% Zn content, in which a Fe 3 Zn 10 phase appeared. The layered structure consisted of alternating columnar-grain and nano-grain layers, which compensated for the intrinsic brittleness of electrodeposited metals and improved the galvanic effect of the alloy, thus increasing the strength and plasticity and changing the corrosion from localized to uniform while augmenting the corrosion rate. The yield strength of the multilayered alloy exceeded 350 MPa, its elongation was more than 20%, and its corrosion rate obtained by immersion test in Hank's solution reached 0.367 mm·y −1 . Fe-Zn alloys with lower Zn content had good cytocompatibility with the human umbilical vein endothelial cells and good blood compatibility. The above results verified that the multilayered Fe-Zn alloy prepared by electrodeposition presented enhanced mechanical properties, higher degradation rate, uniform degradation mechanism and good biocompatibility. It should be qualified for the application of biodegradable stents. Statement of significance A potential biodegradable Fe-Zn alloy, which is difficult to be obtained by the metallurgical method, was prepared by electrodeposition to solve the low degradation rate of iron-based biomaterials. A multilayered microstructure design composed of alternating columnar-grain and nano-grain layers was achieved by changing the electrical parameters. The layered design compensated for the intrinsic poor plasticity of electrodeposited metals. It increased the galvanic effect of the alloy, thus augmenting the corrosion rate and changing the corrosion mode of the alloy from localized to uniform corrosion. The yield strength of multilayered alloy exceeded 350 MPa; its elongation was more than 20%. Moreover, the layered alloy had good cytocompatibility and blood compatibility. It indicates that the alloy is qualified for biodegradable stent application.
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Materials Today Communications
·
2023
·
IF 3.8
Huilin Gao,Qizhang Huang,Qiaoguang Li,Lianying Wu,Haiyan Liao,Murtaza Hasan,Sheng Gong,Xinhua Zhou
Accurate detection of Fe 3+ is an urgent need due rapid increase of hemochromatosis, methemoglobinemia, mental decline and physical weakness throughout the world. Here, nitrogen-doped carbon quantum dots (NCQDs) having blue fluorescence were prepared by facile one-spot hydrothermal method by using binary carbon source. This innovative primed hybrid NCQDs were well characterized by using FT-IR, XPS , and EDS and SEM for purpose of chemical composition and surface functionality. The morphology of NCQDs were confirmed their spherical shape and an average diameter was 4.3 nm by TEM measurement. Surface coating for functional group and nitrogen doped was monitored by the FTIR, XPS and EDX analysis. The photoluminescence measurements showed that NCQDs were non-wavelength dependent with a quantum yield of 73.89%. The NCQDs showed strong evidence to be a excellent fluorescent sensor for the rapid and quick estimation of Fe 3+ with high selectivity and sensitivity. The fluorescence power of NCQDs were slowly declined with higher amount of Fe 3+ concentration ranging from 0.01 to 0.5 and 1–33.3 μM. The accurate range of detection limit was very narrow and found to be 5 nM for Fe 3+ by this method. Furthermore, the function of novel NCQDs for estimation of trace element such as Fe 3+ in different sources of water was yielded at very acceptable recoveries (97.30% ∼ 98.04%). The current designed functional probe provided a promising fluorescent range at narrow level for the Fe 3+ detection is highly appreciable in the future studies.
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NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 17
·8334-8346
·
IF 3.3
Peifu Sun,Xiao Zhang,Zhiren Guo,Xinyue Liu,Yuanming Lan,Dongxiang Zhang,Hansheng Li,Jinying Li,Helei Liu,Xiyan Xu
The excessive discharge of isothiazolinone bacteriostatic agent-containing wastewater has posed serious threats to human health and environmental safety. As 1,2-benzisothiazolin-3-one (BIT) is one of the most commonly used isothiazolinones, its effective degradation is necessary and urgent. In the current study, a NH2-MIL-53(Fe)-based adsorptive photo-Fenton-like system was constructed for efficiently adsorbing and photodegrading BIT under solar light. The equilibrium BIT adsorption capacity Qe of NH2-MIL-53(Fe) reached 1140.89 mg g−1. The adsorptive photo-Fenton-like system has achieved more than 90% removal of BIT using NH2-MIL-53(Fe) in the presence of H2O2 under solar light irradiation, and the band gap of NH2-MIL-53(Fe) was calculated by UV-Vis analysis to be 2.10 eV. The influences of pH, dosage of photocatalysts and H2O2 were also assessed. It was found that H2O2 reduced the recombination of electron–hole pairs, and the radical quenching experiments and EPR testing result confirmed that h+, ˙OH and O2˙− played a crucial role in the photocatalytic process. This study supports the application of Fe-based MOF materials for simultaneous adsorption and the solar light photocatalytic degradation of BIT.
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ENVIRONMENTAL RESEARCH
·
2023
·
IF 8.3
Wenjun Zhu,Xiaohua Zuo,Xiaofei Zhang,Xiangyi Deng,Deng Ding,Chunlei Wang,JunTao Yan,Xiaobo Wang,Guanghui Wang
A novel CuO–Fe 3 O 4 encapsulated in the carbon framework with abundant oxygen vacancies (CuO–Fe 3 O 4 @C) was successfully prepared by thermal conversion of Cu(OAc) 2 /Fe-metal organic framework. The as-prepared catalyst exhibited excellent peroxymonosulfate (PMS) activation performance, good recyclability and fast magnetic separation. Under optimal conditions, the added BPA (60 mg/L) could be completely removed by CuO–Fe 3 O 4 @C/PMS system within 15 min with the degradation rate constant ( k ) of 0.32 min −1 , being 10.3 and 246.2 times that in CuO/PMS (0.031min −1 ) and Fe 3 O 4 /PMS (0.0013 min −1 ) system. A deep mineralization rate of BPA (＞80%) was achieved within 60 min. The results demonstrated the synergistic effect of bimetallic clusters, oxygen vacancies and carbon framework was a key benefit for the exposure of more active sites, the electron donor capacity and the mass transfer of substrates, thereby promoting the decomposition of BPA. Capture experiments and EPR indicated that 1 O 2 was the predominant reactive oxygen species (ROSs). The degradation routes of BPA and the activation mechanism of PMS were proposed. This study offers an opportunity to develop promising MOFs-derived hybrid catalysts with tailored structures and properties for the practical application of SR-AOPs.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Bin Hu,Yongqing Yang,Wei Cao,Xixi Wang,Chuan Zhou,Yiyang Mao,Lei Ge,Ran Ran,Wei Zhou
The high cost and unfavorable catalytic performance for oxygen reduction reaction (ORR) is one of the crucial obstacles that impede widely commercialization of proton-exchange membrane fuel cells (PEMFCs). Herein, we provide a novel, mass-producible ORR catalyst made of low-loading (10 wt%) Pt nanoparticles bound to patchy nitrogen-doped carbon (PNC) with uniformly dispersed FeN 4 sites (Pt/FeN 4 -PNC). The derived catalyst exhibits significantly improved catalytic activity and stability, obtaining a promising mass activity (MA) of 0.94 A mg pt −1 at 0.9 V (vs. RHE) with a negligible decay after 30,000 cycles accelerated durability test (ADT). In the fuel-cell assessment (under H 2 -Air conditions at 80 ℃), the Pt/FeN 4 -PNC and Pt/FeN 4 -PNC-10 g (scaled-up production) achieved peak power densities of 1.13 W cm −2 and 1.14 W cm −2 , respectively, and retained 88.5 % and 88.1 % of the initial values after 30,000 voltage cycles (0.60–0.95 V). The patchy structure of PNC substrate guarantees fast electron routes and resistance to corrosion. With the FeN 4 active sites in the PNC substrate, the oxygen molecules are concurrently reduced on the surfaces of the carbon substrate and Pt nanoparticles, thereby causing the ORR reaction zone on the catalyst layer to expand.
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JOURNAL OF HAZARDOUS MATERIALS
·
2023
·
IF 13.6
Can Feng,Heng Zhang,Yi Ren,Mengfan Luo,Siying Yu,Zhaokun Xiong,Yang Liu,Peng Zhou,Bo Lai
Zerovalent iron (ZVI)-based Fenton-like processes have been widely applied in degrading organic contaminants . However, the surface oxyhydroxide passivation layer produced during the preparation and oxidation of ZVI hinders its dissolution and Fe(III)/Fe(II) cycling, and restricts the generation of reactive oxygen species (ROS). In this study, copper sulfide (CuS) was found to effectively enhance the degradation of diverse organic pollutants in the ZVI/H 2 O 2 system. Moreover, the degradation performance for the actual industrial wastewater (i.e., dinitrodiazophenol wastewater) in the ZVI/H 2 O 2 system was impressively improved by 41% with CuS addition, and the COD removal efficiency could reach 97% after 2 h of treatment. Mechanism investigation revealed that the introduction of CuS accelerated the sustainable supply of Fe(II) in the ZVI/H 2 O 2 system. Specifically, Cu(I) and reductive sulfur species (i.e., S 2– , S 2 2– , S n 2– and H 2 S (aq)) from CuS directly induced efficient Fe(III)/Fe(II) cycling. The iron-copper synergistic effect between Cu(II) from CuS and ZVI expedited Fe(II) generation from ZVI dissolution and Fe(III) reduction by formed Cu(I). This study not only elucidates the promotion effects of CuS on ZVI dissolution and Fe(III)/Fe(II) cycling in ZVI-based Fenton-like processes, but also provides a sustainable and high-efficiency iron-based oxidation system for removal of organic contaminants.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Jun Liu,Hui Wang,Meng-Jie Chang,Wen-Juan Li,Wen-Yao Zhu,Ge Bai,Liu-Qing Yang,Hui-Ling Du,Zhen-Min Luo,Ting Shang
Metal ion doping is an efficient method to achieve high photocatalytic performance of semiconductors. However, the current synthetic methods by using inorganic salts as doped sources in the precursor reaction system might suffer from ion waste and second pollution. Herein, we developed a novel method by employing electrospun nanofibers as ion reservoir to release metal ions for the synthesis of ion-doped semiconductors with high photocatalytic activity . As demonstrated, Co/Fe co-doped BiOCl photocatalyst (Co/Fe-BOC) was facilely prepared in the presence of CoFe 2 O 4 nanofibers as Co and Fe ion reservoir via a simple solvothermal method . Compared with BiOCl, the resulted Co/Fe-BOC shows increased specific surface area, visible light response as well as separation and transportation efficiencies of photogenerated carriers. Thus, the Co/Fe-BOC exhibits significantly enhanced visible light photocatalytic activity to degrade 99.4% rhodamine B (RhB) within 4 min. This new doping approach not only avoids the ion waste and pollution during the reaction process but also facilitates the separation of the photocatalyst. Moreover, the CoFe 2 O 4 nanofibers could be repeatedly used as ion reservoir to prepare high-performance Co/Fe-BOC. This nanofiber-based ion doping approach provides a novel, universal and promising insight to obtain doped semiconductors with high photocatalytic activity.
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Processes
·
2019
·Vol. 7
·期 6
·351
·
IF 1.963
Yali Liu,Xiaorong Kang,Han Cheng
The addition of Fe2+is considered an effective method for increasing methane production, but the added Fe2+may not be absorbed by anaerobic microorganisms due to complex chemical reactions. In this study, ethylenediaminetetraacetic acid (EDTA) was used as a ligand of Fe2+(EDTA-Fe) to promote the dissolution of Fe, and the anaerobic performances of kitchen wastes (KWs) in a semi-continuous reactor were studied. The results indicated that the biogas yields and methane contents were enhanced to 594–613 mL·g−1VSadd·d−1and 63.6–64.4% at an organic loading rate (OLR) of 2.5 gVSadd·L−1·d−1due to EDTA-Fe addition. Simultaneously, the EDTA-Fe was more effective than Fe2+in preventing the acidification of KWs with a high OLR (5.0 gVSadd·L−1·d−1). In addition, the sequential extraction results showed that the water-soluble fraction of Fe in the R3 (EDTA-Fe addition) was 1.49-fold of that in the R2 with Fe2+addition. The contents of coenzymes F420 and F430 were also improved 1.09 and 1.11 times, respectively. Mechanism analysis confirmed that the EDTA enhanced methane production and operational stability by promoting the dissolution of Fe and maintaining a high content of water-soluble Fe.Keywords:semi-continuous reactor;EDTA;Fe;kitchen wastes;methane
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CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Xiaoxia Ou,Fotios Pilitsis,Yilai Jiao,Yong Zhang,Shaojun Xu,Martin Jennings,Yi Yang,S.F. Rebecca Taylor,Arthur Garforth,Huiping Zhang,Christopher Hardacre,Ying Yan,Xiaolei Fan
Structured Fe-ZSM-5 zeolite supported on silicon carbide (SiC) foam catalyst was develop and applied as the packed foam bed catalytic reactor (FBCR) to the liquid phase catalytic wet peroxide oxidation (CWPO) of phenol under flow conditions. Fe catalysts were uniformly incorporated into ZSM-5 coatings using chemical vapour deposition (CVD). Fluid flow analysis of FBCR was performed by varying liquid flow rate, showing the transition of reactor type from the plug flow reactor to the continuous stirred tank reactor at about 1 ml min −1 . Systematic investigation of CWPO within Fe-ZSM-5/SiC FBCRs identified the optimum condition of operating the FBCR (80 mm bed length) as at 60 °C and 1 ml min −1 with the turnover frequency (TOF) of 95 h −1 for phenol degradation (apparent activation energy = 3.4 kJ mol −1 ) and total organic carbon (TOC) conversion of 45.5%. It was believed that the enhanced macromixing promoted by cellular foam supports was accountable for the observed catalytic performance. The longevity of FBCR under flow conditions was also assessed, showing its good stability over 24 h, as well as the potential for practical adoption.
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Chemical Engineering and Processing-Process Intensification
·
2018
·
IF 2.826
Ding Chen,Peng-fei Feng,Fu-hua Wei
Fe-based metal-organic frameworks(Fe(III)-MOFs)were synthesized by Fe 2 (SO 4 ) 3 and trimesic acid using microwave-assisted ball milling method. The structure of the Fe(III)-MOFs was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier transform infrared spectrometry (FTIR). The thermostability of the MOFs was analyzed by thermogravimetric analysis (TGA). Fe(III)-MOFs were added in aqueous solutions to remove organic dyes. The removal efficiencies of Orange II, CR and MB reached 95.9%, 98.7%, 95.7% respectively at 10℃ and reached 97.7%, 99.7%, 97.5% respectively at 35℃ in 300 min.
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FUEL
·
2018
·
IF 4.908
Qicong Liu,Zhe Xiong,Syed Shatir A. Syed-Hassan,Zengtong Deng,Xingyu Zhao,Sheng Su,Jun Xiang,Yi Wang,Song Hu
Ni-based catalyst is prone to the deactivation by coke deposition during the catalytic steam reforming of bio-oil. In order to optimize catalytic activity of the Ni-based catalyst, a two-stage catalytic reforming scheme was proposed whereby a low-temperature (350–600 °C) pre-reforming process with a less expensive catalyst was introduced prior to the Ni-based catalyst. To study this scheme, the reforming experiments with different combinations of Fe/bio-char (in the first stage) and Ni-Ca/γ-Al 2 O 3 (in the second stage) were conducted. In addition to the quantification of product yields, the tar and gas were characterized with an ultraviolet (UV) fluorescence spectroscopy, a gas chromatography/mass spectrometer (GC/MS) and a gas chromatography (GC). The results indicate that significant proportions of naphthalenes and polycyclic aromatics in the intermediate volatiles turned into furans, phenols and non-aromatics, which are easier to be reformed on Ni-based catalysts, via the Fe/bio-char pre-reforming, resulting in the increase of the final H 2 and CO yields of the overall process. At high pre-reforming temperatures (550–600 °C), the coke formation on Ni-based catalyst was significantly inhibited due to the Fe/bio-char pre-reforming. In addition, the results indicate that the spent Ni-based catalyst had more free NiO and NiAl 2 O 4 spinel than the fresh one, suggesting that the increase in the catalytic activity of Ni-based catalyst during the reforming process was promoted by Fe/bio-char pre-reforming.
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CHEMOSPHERE
·
2019
·
IF 5.108
Weirui Chen,Yixiang Bao,Xukai Li,Jun Huang,Yiming Tang,Laisheng Li
Mesoporous Fe-Cu@SiO 2 core-shell catalyst was synthesized and assessed for its catalytic activity in the ozonation of salicylic acid (SA). The synthesized catalyst was characterized by XRD, TEM, SEM, XPS, H 2 -TPR, etc. Fe-Cu@SiO 2 exhibited a regular spherical shape and had the surface area at 1216 m 2 g −1 . The wrapping of metal components and their strong interaction prevented metal leaching. Fe-Cu@SiO 2 showed the highest activity for SA mineralization when compared with Fe@SiO 2 and Cu@SiO 2 . In Fe-Cu@SiO 2 /O 3 , 88% TOC was removed, which was 2.5 times as much as that in sole ozonation. SA degradation efficiency in Fe-Cu@SiO 2 /O 3 increased with initial pH. O 3 , ·OH and H 2 O 2 were the main reactive oxygen species accounting for SA mineralization. Due to their scavenging effect of ·OH, NH 4 + , NO 3 − and humic acids would inhibit the degradation efficiency of Fe-Cu@SiO 2 /O 3 . Acidic sites, oxygen vacancies and the Fe-Cu(I/II) electron transfer were responsible for ozone decomposition and ·OH generation. SA mineralization proceeded through the ·OH mechanism. Moreover, SA mineralization in O 3 and Fe-Cu@SiO 2 /O 3 both exhibited a two-stage pseudo first-order kinetics (stage I: 0–45 min; stage II: 45–120 min). The degradation intermediates were detected to investigate the reaction pathway. ORP and EEM were used to monitor the degradation process. Great difference was found for carboxylic acids accumulation in O 3 and Fe-Cu@SiO 2 /O 3 . The accelerated removal of oxalic acid and humic acid-like intermediates were responsible for the two-stage pseudo first-order kinetics.
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危险品化学品经营许可证（带存储）