SEPARATION AND PURIFICATION TECHNOLOGY
·
2018
·
IF 3.927
Haoran Dong,Yujun Cheng,Yue Lu,Kunjie Hou,Lihua Zhang,Long Li,Bin Wang,Yaoyao Wang,Qin Ning,Guangming Zeng
This study examined the toxicities of Fe/Ni and starch-stabilized Fe/Ni (S-Fe/Ni) nanoparticles (NPs) toward Escherichia coli . The inactivation of E. coli by Fe/Ni NPs was concentration- and time-dependent. Fe/Ni NPs exhibited a stronger toxicity than the bare Fe 0 NPs (i.e., Ni = 0 wt%), revealing that the loading of Ni increased the toxicity of Fe 0 NPs. However, there was no positive correlation between Ni content and the toxicity of Fe/Ni NPs when Ni content increased from 1 wt% to 5 wt%. The starch coating could alleviate the toxicity of Fe/Ni NPs, depending on starch concentration. Transmission Electron Microscopy analysis demonstrates that membrane disruption and cellular internalization of NPs occurred for E. coli after exposure to the Fe/Ni NPs. The NPs might have reacted with the carboxyl, ester and amine groups on the cell surface, as indicated by the Fourier Transform Infrared Spectroscopy analysis. However, the S-Fe/Ni NPs did not cause obvious membrane disruption of the cells due to the effect of starch coating, which inhibited the close contact of NPs with cells by providing electrostatic repulsion and steric hindrance. Besides, the addition of N-Acetyl-L-cysteine, as a potent scavenger for reactive oxygen species (ROS), remarkably reduced the toxicities of both Fe/Ni and S-Fe/Ni NPs, which indicated that the ROS-induced oxidative stress should be the primary mechanism for the inactivation of E. coli . The aging experiments evidenced that both Fe/Ni and S-Fe/Ni NPs would lose their toxic potential over time, posing less threat to the environment in the long term.
研究领域:
微生物学
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环境科学
·
纳米生物学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2019
·Vol. 21
·期 40
·6010-6017
·
IF 3.382
Shuai Fang,Hongan Ma,Zhanke Wang,Zhiqiang Yang,Zheng-hao Cai,Luyao Ding,Xinyuan Miao,Liangchao Chen,XiaoPeng Jia
FeS is the main sulfur-containing compound in natural diamond inclusions. The research on FeS-doped diamond crystals plays an extremely important role in exploring the growth environment of natural diamond and the chemical composition of the earth. In our work, the characteristics of FeS doped diamond crystals were studied by using a China-type large volume cubic high-pressure apparatus with an iron–nickel alloy as a catalyst at 6.0 GPa and 1300–1350 °C. The crystals were characterized by OM, SEM, XPS, FTIR and Raman. Scanning electron microscopy of the crystal shows that the {100} plane of the crystal is rougher than {111}, which is related to the number of dangling bonds on different crystal faces of the crystal. The residue on the surface of the crystal was detected by mapping, and the test result showed that it was a sulfur iron and a sulfur nickel compound. FeS will decompose in the synthesis system, and the decomposition products are Fe and S2.The XPS spectrum of the crystal shows that S was successfully incorporated into the diamond lattice by forming C–S–O and C–S–SO2–C bonds, and the peak intensity was strong. The infrared spectrum shows that the N content in the crystal gradually increases as the doping ratio increases. Raman spectroscopy analysis shows that the S-doped Ib-type diamond single crystal has a high-quality sp3 structure, and the full width at half maximum (FWHM) of the crystal gradually broadens as the doping ratio increases.
研究领域:
地球化学
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材料科学
·
高压合成
✓ 已验证
DOI
高影响因子
Environmental Chemistry Letters
·
2021
·Vol. 19
·期 4
·3511-3515
·
IF 9.027
Si Huimin,Che Mingda,Chen Zhiguo,Qiu Sha,Cui Mei,Huang Renliang,Qi Wei,He Zhimin,Su Rongxin
Chloroform is an harmful chlorinated hydrocarbon which is hardly degraded using actual dechlorination methods. Alternatively, carboxymethyl cellulose/zero-valent iron appears promising to degrade chlorinated hydrocarbons in water, yet actually carboxymethyl cellulose cannot inhibit the oxidation and sedimentation of iron ions under alkaline condition. Here, polyethylene glycol, a green and low-cost non-ionic polymer, was used as a stabilizer to synthesize polyethylene glycol-stabilized Fe/Ni nanoparticles (PEG-Fe/Ni) for removing chloroform from water in a wide range of pH, from 3 to 11. PEG-Fe/Ni was prepared by a stepwise liquid-phase chemical reduction, then added into groundwater to remove chloroform. Results show that polyethylene glycol can both reduce the particle size from 106.9 to 79.6 nm and prevent the oxidation and sedimentation of iron ions under alkaline condition. The removal efficiency of chloroform increased from 86.3 to 100% at pH 6 in the presence of polyethylene glycol, and slightly decreased to 95.4% at pH 11. The calculated rate constant ( k ) indicates that chloroform removal follows pseudo-first-order kinetics. Furthermore, the PEG-Fe/Ni also removed chloroform from real groundwater at pH 8 with an efficiency of 90.1% in 4 h, which is higher than that for Fe/Ni nanoparticles, of 41.7%.
研究领域:
环境科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2020
·
IF 3.407
Youhong Sun,Jinhao Wu,Linkai He,Baochang Liu,Chi Zhang,Qingnan Meng,Xuliang Zhang
Diamond/WC-Fe-Ni composite is a potential composition for impregnated diamond drill bits. It is necessary to avoid the graphitization of the diamond from Fe and Ni under the powder metallurgy process. Boron carbide (B 4 C) was coated on diamond, and diamond/WC-Fe-Ni composites were consolidated by hot pressing at different temperatures. The influences of sintering temperature and interfacial structure on bending strength and wear behavior were investigated. The bending strength for diamond/WC-Fe-Ni composite was dependent on matrix densification and interfacial graphitization. Un-coated diamond was eroded by Fe-Ni matrix and partially converted to graphite during the sintering process at all sintering temperatures. In opposite, B 4 C coating was beneficial to matrix densification at a lower sintering temperature, and delayed the appearance of graphitization to around 1300 °C. Therefore, the diamond/WC-Fe-Ni composites with B 4 C coating exhibited larger bending strength and better wear behavior at a relative low sintering temperature.
研究领域:
材料科学
·
矿物工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Chao Xue,Wanling Cai,Xiulan Weng,Gary Owens,Zuliang Chen
The use of biomass for the synthesis of value-added products, such as functional nanomaterial for the removal of contaminants, is a challenge. In this study, hybrid bimetallic Fe/Ni nanoparticles and reduced graphene supported bimetallic Fe/Ni nanoparticles (Fe/Ni-rGO) were prepared via a one-step green synthesis using green tea extract, and thereafter evaluated for the simultaneous removal of rifampicin (RIF) and Pb(II) from aqueous solution. The efficiencies of Pb(II) and RIF removal by Fe/Ni-rGO were 87.5 and 96.8%, respectively. The removal performance of the hybrid Fe/Ni-rGO was better than either n Fe/Ni, rGO, or Fe-rGO. Detailed characterization and analyses of Fe/Ni-rGO indicated that both Fe and Ni nanoparticles were evenly distributed over the surface of rGO and that aggregation of Fe, Ni nanoparticles, and stacking of rGO in the hybrid were decreased. Furthermore, while LC-TOF-MS analysis showed that RIF was degraded into small-molecule fragments, XPS showed that Pb(II) was not reduced to Pb 0 . The major conditions impacting removal efficiency, adsorption kinetics, and fit to adsorption isotherm models were examined to better understand the removal mechanism. While the adsorption of both contaminants fit well a pseudo-second-order kinetic model, the adsorption of RIF fit the Freundlich isotherm model best, while the adsorption of Pb(II) fit the Langmuir isotherm model best. Thus, the removal mechanism of both contaminants firstly being chemical adsorbed onto the surface, while n Fe/Ni continues to participate in the catalytic reduction of RIF. Moreover, Fe/Ni-rGO could be reused and performed well for wastewater treatment , thus suitable as a practical resource recycling technology .
研究领域:
环境科学
·
纳米材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Rui Cai,Ping-an Yang,Haibo Ruan,Xin Huang,Zhihao Zhou,Qiao Chen,Yuxin Zhang,Xinglong Gong,Yingang Gui,Rui Li
How to prepare materials according to the target properties has been a hot research topic. In this paper, the target electromagnetic parameters are obtained according to the performance requirements, and the nanoflower rod-like, low-density mulberry-like and high-density mulberry-like one-dimensional (1D) core–shell structured Fe@Ni ( x ) nanowires (NWs) are prepared by liquid-phase reduction method. The effective absorption bandwidth (EAB) of sample Fe@Ni (40) in the low-frequency (2–8 GHz) is up to 1.89 GHz (3.1 mm). Sample Fe@Ni (60) is able to reach a maximum EAB of 3.18 GHz at a thickness of 0.9 mm. Concisely, the sample has the ability to absorb microwaves in low frequency bands and ultra-thin thicknesses. The reason can be attributed to the strong magnetic coupling brought by the bimetallic composition to strengthen the resonance level and the excellent 1D core–shell structure to enhance the efficiency of polarization loss. In conclusion, Fe@Ni ( x ) provides a technological route for the preparation of low-frequency and ultra-thin-thickness absorbers.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Tao Zhang,Pan Wu,Gary Owens,Zuliang Chen
Since ofloxacin (OFX) is one of many common antibiotics, which effluxes into aquatic environment in relatively high concentration, it has become of significant environmental concern due to the potential for increased antibiotic resistance. In this study, an innovative functional Fe/Ni@ZIF-8 composite was successfully used for the Fenton-like oxidation of OFX, with a OFX removal efficiency >98% under optimal conditions. FTIR analysis confirmed that OFX removal occurred via adsorption to Fe/Ni@ZIF-8 by a combination of π-π bond intercalation and electrostatic interaction, while XPS revealed that the Fe/Ni NPs in Fe/Ni@ZIF-8 were also involved in oxidation. Furthermore, LC-MS analysis identified the presence of several OFX degradation products post exposure, which indicted that Fe/Ni NPs in Fe/Ni@ZIF-8 reacted with H 2 O 2 to form •OH, leading to Fenton-like oxidation of OFX. Thus overall, OFX removal by Fe/Ni@ZIF-8 involved both adsorption to ZIF-8 and Fenton-like oxidation by Fe/Ni NPs. A synergistic mechanism for OFX removal by Fe/Ni@ZIF-8 was thus proposed. The removal efficiency of the synthesized catalysts remained high (above 65%) even after a 5th reuse cycle, which reflected the high stability of Fe/Ni@ZIF-8. Overall, this study demonstrated that Fe/Ni@ZIF-8 had significant potential for the removal of OFX from wastewaters with a removal efficiency >90%.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nature Communications
·
2022
·Vol. 13
·期 1
·1-9
·
IF 17.694
Zhang Xiaoran,Zhu Xiaorong,Bo Shuowen,Chen Chen,Qiu Mengyi,Wei Xiaoxiao,He Nihan,Xie Chao,Chen Wei,Zheng Jianyun,Chen Pinsong,Jiang San Ping,Li Yafei,Liu Qinghua,Wang Shuangyin
Electrocatalytic urea synthesis emerged as the promising alternative of Haber–Bosch process and industrial urea synthetic protocol. Here, we report that a diatomic catalyst with bonded Fe–Ni pairs can significantly improve the efficiency of electrochemical urea synthesis. Compared with isolated diatomic and single-atom catalysts, the bonded Fe–Ni pairs act as the efficient sites for coordinated adsorption and activation of multiple reactants, enhancing the crucial C–N coupling thermodynamically and kinetically. The performance for urea synthesis up to an order of magnitude higher than those of single-atom and isolated diatomic electrocatalysts, a high urea yield rate of 20.2 mmol h −1 g −1 with corresponding Faradaic efficiency of 17.8% has been successfully achieved. A total Faradaic efficiency of about 100% for the formation of value-added urea, CO, and NH 3 was realized. This work presents an insight into synergistic catalysis towards sustainable urea synthesis via identifying and tailoring the atomic site configurations.
研究领域:
化学
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL
·
2021
·
IF 6.609
Hanzi Liu,Yi Zhang,Haiming Wang,Changfu You
Selective non-catalytic reduction of NOx (SNCR) with NH 3 is commonly used in industrial facilities like circulating fluidized bed (CFB) furnaces. However, the strongly temperature-dependent de-NOx feature confines its applications in a specific temperature range (900–1050 °C). Here, we report a new strategy on using Fe-Ni-W exchanged zeolite (0.5FNW-H) as a catalyst to extend the SNCR temperature window. In the CFB reactor, a significant NOx conversion improvement ranging from 14.1% to 80.9% was achieved at 700 to 850 °C by applying the developed catalyst. Catalyst dosage of 4500 h −1 (GHSV), a particle diameter of 0.1–0.3 mm, and NH 3 injection position at the dense-phase zone were found preferred for NOx reduction with the highest efficiency of ~85% at 700 °C. The physicochemical properties of the catalysts remained stable after the circulating reactions in the CFB reactor. The developed catalyst is particularly applicable for improving the SNCR performance when the thermal power plants are operated at low loads.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 6
·9421-9432
·
IF 0
Che Mingda,Su Hongjian,Si Huimin,Guo Bin,Huang Renliang,Zhao Jing,Su Rongxin
As the representative volatile chlorinated hydrocarbons detected in wastewater, the removal of composite chlorinated ethenes is a major challenge in wastewater treatment. In the present study, an efficient removal system for composite chlorinated ethenes was reported, in which gallic acid was used to enhance the activation of persulfate by Fe/Ni nanoparticles. The influences of gallic acid-Fe/Ni and persulfate concentrations, initial pH value, reaction temperature, inorganic anions, and natural organic matters were evaluated in the composite chlorinated ethenes removal. Our results showed that the gallic acid-Fe/Ni-persulfate system with 9.0 mM of gallic acid-Fe/Ni and 30.0 mM of persulfate yielded about 100% trichloroethylene removal and 97.3%-98.6% perchloroethylene removal in the pH range of 3.0–12.0. Electron paramagnetic resonance analysis and radical quenching experiments indicated that SO 4 •− and • OH were the predominant radical species under acidic and alkaline conditions. Ultraviolet visible spectroscopy and inductively coupled plasma optical emission spectrometer tests revealed the Fe-gallic acid chelation could regulate the concentration of iron ions and improve the reactivity of gallic acid-Fe/Ni. These results demonstrated that the gallic acid-Fe/Ni-persulfate system was a promising strategy for treating composite chlorinated ethenes-containing wastewater.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
PubMed
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Tao Zhang,Xiaoying Jin,Gary Owens,Zuliang Chen
Dye-contaminated wastewater resulting from rapid industrialization and urbanization is a global problem. In this study, a ZIF-8@Fe/Ni sample was synthesized for the removal of malachite green (MG), removing more than 99% of an initial MG concentration of 50 mg L −1 within 120 min with a 318 K adsorption capacity of 151.520 mg g −1 . To understand the dye removal mechanism based on adsorption and reduction, ZIF-8@Fe/Ni was characterized by various techniques. XRD showed that the ZIF-8@Fe/Ni composite had a characteristic peak attributable to Fe/Ni around 44.8°, where the presence of Fe/Ni did not affect the structure of ZIF-8. SEM confirmed that ZIF-8@Fe/Ni was successfully prepared, while XRD and FTIR revealed that the structure of ZIF-8@Fe/Ni remained stable following the introduction of Fe/Ni. XPS showed that while Fe/Ni nanoparticles existed in ZIF-8-Fe/Ni, partial oxidation also occurred. GC–MS demonstrated the creation of two major MG degradation products, (4-aminophenyl) (phenyl) methanone and 4-aminophenol. While the overall adsorption process of MG to ZIF-8@Fe/Ni conformed to pseudo-second-order kinetics, degradation followed pseudo-first-order reduction kinetics. When applied to the remediation of wastewater, ZIF-8@Fe/Ni removed 92% of MG. Overall, this study demonstrated that ZIF-8@Fe/Ni could be a promising material for the treatment of wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2019
·
IF 4.63
Peng Wu,Jiaqiang Sun,Mohamed Abbas,Pengfei Wang,Yilong Chen,Jiangang Chen
Hydrophobic SiO 2 -supported Fe-Ni bimetallic catalysts were synthesized by facile hydrothermal method, followed by grind-mixing process. The as-synthesized nanoparticles were appointed as robust catalysts in the methanation process to improve the calorific value of the natural gas. Notably, the functionalization of SiO 2 surface with a hydrophobic layer was performed using a fluorinated alkyl group, as a critical step to prohibit the water-gas shift (WGS) reaction and consequently produce low amount of CO 2 content during the methanation process. The obtained catalytic results demonstrated that Fe 1.5 Ni 1.5 catalyst exhibited an excellent CO conversion of 95.2% at 320 °C with a natural gas calorific value of 56.4 MJ Nm −3 , which is much higher than the previously reported results when traditional Ni-based catalysts used. Moreover, the modified hydrophobic catalyst exhibited a lower CO 2 selectivity compared with unmodified one. This study provides a new and promising insight for the design and development of high-calorie SNG product.
研究领域:
催化化学
·
能源材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）