Nature Chemical Biology
·
2024
·
IF 12.9
Wang Shiwen,Liu Min,Hu Dongping,Dong Zhicheng,Zhao Zhong
Superoxide anion is thought to be a natural by-product with strong oxidizing ability in all living organisms and was recently found to accumulate in plant meristems to maintain stem cells in the shoot and undifferentiated meristematic cells in the root. Here we show that the DNA demethylase repressor of silencing 1 (ROS1) is one of the direct targets of superoxide in stem cells. The Fe–S clusters in ROS1 are oxidized by superoxide to activate its DNA glycosylase/lyase activity. We demonstrate that superoxide extensively participates in the establishment of active DNA demethylation in the Arabidopsis genome and that ARABIDOPSIS RESPONSE REGULATOR 12 acts downstream of ROS1-mediated superoxide signaling to maintain stem cell fate. Our results provide a mechanistic framework for superoxide control of the stem cell niche and demonstrate how redox and DNA demethylation interact to define stem cell fate in plants.
研究领域:
植物生物学
·
表观遗传学
·
干细胞生物学
✓ 已验证
DOI
PubMed
高影响因子
OPTICAL MATERIALS
·
2021
·
IF 3.08
Xuyang Li,Zongxue Yu,Liangyan Shao,Xiaofang Feng,Haojie Zeng,Yuchuan Liu,Runxuan Long,Ximei Zhu
In order to effectively solve the two major problems of photocatalyst recovery and membrane fouling , this research combines photocatalyst and membrane separation technology . In this study, the NH 2 -MIL-88B(Fe)/CDs@GO material with good photocatalytic properties was synthesized by hydrothermal method and mechanical stirring, and the photocatalytic membrane was obtained by vacuum filtration. The results show that the NH 2 -MIL-88B(Fe)/CDs@GO membrane can effectively intercept and degrade methylene blue (MB). After 10 cycles, the rejection rate of MB can still reach 99.5%, which is about 2.5 times of pure GO membrane (40%). After 15 min of visible light irradiation, the Flux recovery rate (FRR) of NH 2 -MIL-88B(Fe)/CDs@GO membrane can reach 95%, and the antifouling performance is excellent. In this study, the composite photocatalytic membrane shows excellent stability, photocatalytic performance and self-cleaning property, which is conducive to widening the application prospect of wastewater treatment .
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Nanoscale Advances
·
2022
·Vol. 4
·期 9
·2171-2179
·
IF 5.598
Dawei Xu,Xuhui Li,Tingting Zheng,Ruixue Zhao,Pengyu Zhang,Kai Li,Zhongfeng Li,Lirong Zheng,Xia Zuo
Here, a series of Fe/N/C catalysts with different proportions and pyrolysis temperatures are prepared by co-pyrolysis of melamine with a γ-cyclodextrin metal–organic framework (γ-CD-MOF) containing iron(II) phthalocyanine (FePc). Due to the restriction effect of the host and guest at the molecular level, γ-CD-MOF can effectively avoid the π–π stacking of FePc and restrain the agglomeration of Fe atoms during pyrolysis. The phases and structures of the catalysts are characterized, which proves that the obtained catalyst has a three-dimensional porous and internal cavity structure with abundant surface area (1055.317 m2 g−1) and Fe is atomically dispersed in nitrogen-doped carbon. The onset potential (0.988 V vs. RHE) and half-wave potential (0.846 V vs. RHE) of FePc@CD/M (1 : 20)-1000 are superior to those of a commercial 20% Pt/C catalyst. FePc@CD/M (1 : 20)-1000 also exhibits an approximately four-electron (3.84) transfer process, good stability and excellent methanol tolerance.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
ChemistrySelect
·
2023
·Vol. 8
·期 1
·e202204011
·
IF 2.1
Chuan Chen,Tianhao Yao,Sen Qian,Qiang Zhang,Ximin Zhang
Graphical A series of Ni x Zn 1−x Fe 2 O 4 (x=0, 0.25, 0.5, 0.75 and 1) sponges have been fabricated through a facile blowing-combustion method. The optimized Ni 0.75 Zn 0.25 Fe 2 O 4 sponge showed pure phase of spinel ferrite and displayed enhanced magnetic satuaratiuon of 44.98 emu/g. Spinel ferrites have been widely used in various fields, among which nickel-zinc (NiZn) ferrites have drawn much attention due to their high electrical resistivity as well as low eddy current loss. To accommodate highly-integrated modern electronic devices, the preparation methods for nano/micro-sized NiZn ferrites have been widely discussed. Nevertheless, these current synthesis routes are usually cost/time-consuming, which hinders their large-scale production for practical applications. Herein, we present a facile, low-cost synthesis strategy for NiZn ferrites (Ni x Zn 1−x Fe 2 O 4 , x=0, 0.25, 0.5, 0.75 and 1) through a blowing-combustion method. The effect of Ni/Zn molar concentration on the structure, morphology as well as magnetic properties has been thoroughly investigated through X-ray diffraction, Raman spectroscopy, scanning electron microscopy and vibrating sample magnetometer. Thanks to the synergetic effect of the pure phase and moderate Ni molar concentration, the Ni 0.75 Zn 0.25 Fe 2 O 4 shows an enhanced saturation magnetization of 44.98 emu/g. More importantly, this blowing-combustion method may also be commonly applied to other spinel ferrites with different stoichiometric ratios and heteroatom doping.
研究领域:
材料科学
·
纳米技术
·
磁学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 4
·2198-2208
·
IF 3.119
Hui Su,Jiaxin Lv,Liansheng Yang,Li Feng,Yongze Liu,Ziwen Du,Liqiu Zhang
The pollution of aromatic organophosphorus flame retardants (aromatic OPFRs) in aquatic environments has drawn great attention over the last few years. Two MIL-101-based metal–organic frameworks (Cr-MIL-101 and Fe-MIL-101-NH2) which possess ordered mesoporous cavities (2.9 and 3.4 nm) and aromatic structures were chosen and prepared to selectively adsorb a typical aromatic OPFR [triphenyl phosphate (TPhP)] from aqueous solution. Pore distribution analysis showed that Cr-MIL-101 and Fe-MIL-101-NH2 had both a mesoporous structure (2–3.5 nm) and microporous structure (1–2 nm), conducive to diffusion and adsorption of TPhP molecules. Compared with Fe-MIL-101-NH2 as well as commercial activated carbon, Cr-MIL-101 showed rapid and efficient adsorption for TPhP, and its initial sorption velocity (v0) calculated from the pseudo-second-order model was up to 568.18 μmol g−1 h−1. The adsorption equilibrium of TPhP on the Cr-MIL-101 was almost achieved within 12 h, while the equilibrium time of other adsorbents required more than 48 h. The study of selective adsorption found that Cr-MIL-101 had a higher sorption amount for aromatic OPFRs than alkyl-OPFRs and other aromatic compounds with different chemical structures. Cr-MIL-101 was able to keep a steady selective adsorption for TPhP in the presence of co-existing aromatic compounds. Based on the analysis of Kow, molecular structure and further density functional theory calculations, hydrophobic interactions may play a dominant role in the selective adsorption process of TPhP, and π–π interactions may be also involved. Cr-MIL-101 exhibits reusability and promising potential to rapidly and selectively remove aromatic OPFR in environmental remediation.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
FIBERS AND POLYMERS
·
2022
·Vol. 23
·期 10
·2809-2819
·
IF 2.347
Yang Yuhui,Chen Hongbin,Zhang Ruquan,Huang Jingjing,Bai Zhikui,Xiao Shili
The ferric ions sludge produced during pollutants degradation was an obstacle for large scale application of Fenton oxidation technology. Herein, we reported a facile method using 2,2,6,6-tetramethylpiperidine-1-oxygen radical (TEMPO)-oxidized cotton fabric as a substrate for anchoring Fe(II) ions to produce Fe(II)-anchored cotton fabric. The formation of Fe(II)-anchored cotton fabric was confirmed using EDS analysis and FTIR measurement. Bath experiments indicated that Fe(II)-anchored cotton fabric could Fenton oxidize rhodamine B (RhB) dye in a high efficient rate (95.9 %) within 60 min without second pollution. Fe(II)-anchored cotton could be reused without any physical/chemical treatment and its decolorization efficiency was retained at 89.9 % even after the third cycle. Moreover, the decolorization behavior of Fe(II)-anchored cotton fabric for the RhB solution was affected by H 2 O 2 dosage, Fe(II) ion content, and inorganic salts. Kinetic study indicated that the RhB decolorization process fits a pseudo-first order well and the sorption isotherm assessment revealed that the reactive sorption of RhB dye on Fe(II)-anchored cotton fabric fits the Freundlich model.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF STRUCTURAL CHEMISTRY
·
2022
·Vol. 63
·期 4
·634-641
·
IF 1.004
Wu G. L.,Zheng C. Y.
Abstract [Fe III (OMe)(Hedtb)](ClO 4 ) 3 ·6.5CH 3 OH ( 1 ) and [Fe III (O n- Bu)(Hedtb)](ClO 4 ) 3 ·3 n -BuOH ( 2 ) (edtb = N,N,N′,N′-tetrakis[(2-benzimidazolyl)methyl]-1,2-ethanediamine) were prepared and display lipoxygenase activity. X-ray crystallography reveals that the Fe III centers in complexes 1 and 2 are ligated to three nitrogens of benzimidazole and two alkylamine nitrogen atoms from the edtb ligand, with a terminal alkyoxyl group occupying the sixth position. Complexes 1 and 2 both possess a Fe III –O R center ( R = Me, 1 ; n -Bu, 2 ) with Fe–O bond distances of 1.799(3) Å and 1.789(5) Å, respectively. The UV-Vis spectra and electrochemical properties of the complexes were recorded. Both complexes have strong absorption peaks at around 375 nm and display lipoxygenase activity.
研究领域:
生物无机化学
·
配位化学
·
酶催化
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2016
·
IF 3.299
Lingjun Bu,Zhou Shi,Shiqing Zhou
In this paper, a mathematical model on Fe(II)-activated persulfate oxidation of atrazine (ATZ) was tested using the rate constants from literature, and the degradation kinetics and mechanism of ATZ degradation in Fe(II)/persulfate (Fe 2+ /PS) system were investigated to verify the model. Some influence factors were taken into consideration in this model, including molar ratio of Fe 2+ and PS, initial ATZ concentration, natural organic matter (NOM) concentration, tertiary butanol (TBA) and methanol (MeOH) concentrations. Corresponding experimental data could be predicted accurately according to this model. Both experimental data and predicted results implied that a molar ratio of Fe 2+ and PS at 1:1, low initial ATZ and NOM concentrations were favorable for ATZ degradation. Besides, the radical species were determined via evaluating the effect of TBA and MeOH, and results confirmed that both sulfate radical (SO 4 − ) and hydroxyl radical (OH ) existed in this system. To investigate the predominant radical in Fe 2+ /PS system, nitrobenzene (NB) was used as a probe compound which only react with OH . According to the degradation efficiency of NB and ATZ in Fe 2+ /PS system, it could be concluded that only small amount of OH were produced and SO 4 − made a major contribution to ATZ degradation in Fe 2+ /PS system. Experimental data, as well as the mathematical model in this study, improved our understanding on the effect of operating parameters for ATZ degradation in Fe(II)-based advanced oxidation processes.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 16
·2839
·
IF 5.719
Yuruo Zheng,Ghulam Hussain,Shuyi Li,Shanta Batool,Xiawa Wang
In this work, nanoparticles of Co1−xRexFe2O4and CoFe2−xRexO4(0 ≤ x ≤ 0.05) were synthesized by the sol-gel method. The Rietveld refinement analysis of XRD and Raman data revealed that all of the prepared samples were single phase with a cubic spinel-type structure. With the substitution of Re, the lattice parameters were slightly increased, and Raman spectra peak positions corresponding to the movement of the tetrahedral sublattice shifted to a higher energy position. Furthermore, Raman spectra showed the splitting of T2gmode into branches, indicating the presence of different cations at crystallographic A- and B-sites. The SEM micrograph confirms that surface Re exchange changes the coordination environment of metals and induces Fe-site structure distortion, thereby revealing more active sites for reactions and indicating the bulk sample’s porous and agglomerated morphology. The vibrating sample magnetometer (VSM) results demonstrated that the synthesized nanoparticles of all samples were ferromagnetic across the entire temperature range of 300–4 K. The estimated magnetic parameters, such as the saturation magnetization, remanent magnetization, coercivity, blocking temperature (TB), and magnetic anisotropy, were found to reduce for the Co-site doping with the increasing doping ratio of Re, while in the Fe site, they enhanced with the increasing doping ratio. The ZFC-FC magnetization curve revealed the presence of spin-glass-like behavior due to the strong dipole–dipole interactions in these ferrite nanoparticles over the whole temperature range. Finally, the dielectric constant (εr′) and dielectric loss (tanδ) were sharply enhanced at low frequencies, while the AC conductivity increased at high frequencies. The sharp increases at high temperatures are explained by enhancing the barrier for charge mobility at grain boundaries, suggesting that samples were highly resistive. Interestingly, these parameters (εr′,tanδ) were found to be higher for the Fe-site doping with the increasing Re doping ratio compared with the Co site.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9.1
Xiaoyuan Zhang,Rui Zeng,Zhenbei Wang,Fei Qi,Chen Li,Yatao Liu,Fan Li,Ziteng Chen,Yujia Yuan,Zhuoran Bai,Yongshun Yu,Jun Nan,Amir Ikhlaq,Shengnan Li
The potential of Fe(VI) enhanced coagulation-ultrafiltration (C-UF) for the simultaneous enhancement of ibuprofen (IBP) removal and membrane alleviation was investigated by comparing Fe(VI)-UF, FeCl 3 -UF, AlCl 3 -UF, Fe(VI)-FeCl 3 -UF, and Fe(VI)-AlCl 3 -UF. The results showed that Fe(VI)-FeCl 3 -UF and Fe(VI)-AlCl 3 -UF achieved IBP removal efficiencies of 66.6% and 76.9%, respectively, which were significantly higher than those obtained with Fe(VI)-UF, FeCl 3 -UF, AlCl 3 -UF. This confirmed that Fe(VI) enhanced C-UF could effectively improve IBP removal compared to individual Fe(VI)-UF or conventional C-UF. This improvement was attributed to additional highly reactive Fe(V)/Fe(IV) intermediates generated by adding metal coagulants to instantaneously activate residual Fe(VI) during the Fe(VI) enhanced C-UF process. In addition, Fe(VI)-FeCl 3 -UF and Fe(VI)-AlCl 3 -UF further alleviated total membrane fouling compared to FeCl 3 -UF and AlCl 3 -UF, with a significant shift of membrane fouling toward reversible fouling. Floc properties, NOM characteristics, and membrane surface characterization were comprehensively analyzed to reveal membrane fouling alleviation mechanisms in Fe(VI) enhanced C-UF. Simultaneous cleavage into smaller molecules and polymerization into larger fractions of NOM by Fe(VI) could reduce the affinity of foulants for membrane surface adsorption and consequently lower irreversible fouling. While Fe(VI) reduction would produce iron-based hydroxides to participate in the growth process of flocs, leading to the formation of flocs with higher density. These flocs would accumulate on membrane surface to form a denser cake layer, which contributed to severe membrane fouling.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2026
·
IF 5.8
Yunying Wang,Yanyan Yu,Ying He,Yun Liu
Single-atom iron catalysts have emerged as promising mimics of oxidases; however, strategies to enhance their intrinsic catalytic activity remain underexplored. Herein, waste pitch and eggshells are utilized for fabricating high-performance nanozymes by coloading nanocopper and iron single atoms onto nitrogen-doped carbon nanotubes (Fe/Cu@NCNTs). It has been demonstrated that copper nanoparticles serve as a critical modulator, electronically tuning the iron sites, which increases the Fe2+/Fe3+ ratio and promotes the formation of Fe–Cu nanoalloys. These synergistic effects significantly enhance the oxidase-like activity of the catalyst. The optimized Fe/Cu@NCNTs exhibit a 48.7% higher specific activity and superior substrate affinity compared with the Fe@NCNTs counterpart. Leveraging this enhanced catalytic performance, a smartphone-assisted colorimetric sensing platform was developed for the rapid visual detection of multiple analytes. Furthermore, by incorporating a three-channel sensor array (TMB, ABTS, and OPD) with pattern recognition analysis, the platform accurately discriminates between nine antioxidants at concentrations as low as 10 μM. This work not only provides valuable insight into the mechanistic role of copper in enhancing the oxidase-like activity of iron single-atom catalysts but also offers a versatile and high-throughput sensing platform that advances the application of nanozymes in complex sample analysis.
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY LETTERS
·
2015
·Vol. 44
·期 6
·743-745
·
IF 1.23
Guan Dinghui,Han Lu,Wang Lulu,Song He,Chu Wenyi,Sun Zhizhong
The efficient, simple, and environment-friendly route of direct cyanation of picolinamides has been developed with nontoxic K4[Fe(CN)6] as the cyanide source through Pd-catalyzed C–H bond activation. A series of N-(naphthalene-1-yl)picolinamide derivatives were successfully transformed to the corresponding cyanation products. The cyanation mechanism has also been speculated.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）