ACS Omega
·
2021
·
IF 3.512
Binbin Jin,Ligang Luo,Longfei Xie
The utilization of CO2, as a cheap and abundant carbon source to produce useful chemicals or fuels, has been regarded as one of the promising ways to reduce CO2 emissions and minimize the green-house effect. Previous studies have demonstrated that CO2 (or HCO3–) can be efficiently reduced to formic acid with metal Fe under hydrothermal conditions without additional hydrogen and any catalyst. However, the pathways and kinetics of the autocatalytic CO2 reduction remain unknown. In the present work, the reaction kinetics were carefully investigated according to the proposed reaction pathways, and a phenomenological kinetic model was developed for the first time. The results showed that the hydrothermal conversion of HCO3– into formic acid with Fe can be expressed as the first-order reaction, and the activation energy of HCO3– is 28 kJ/mol under hydrothermal conditions.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Jialin Liang,Xiaojian Liao,Maoyou Ye,Zhijie Guan,Zhihua Mo,Xian Yang,Shaosong Huang,Shuiyu Sun
The stabilization and dewaterability of waste activated sludge (WAS) are essential factors for downstream disposal or reuse. Herein, two types of zero-valent metals, zero-valent iron (Fe 0 ) and zero-valent aluminum (Al 0 ), were compared for their ability to activate peroxymonosulfate (PMS) during the WAS conditioning process, with the effects of PMS activation by these two metals on WAS dewaterability and the potential environmental risks evaluated. Results showed that compared to Al 0 /PMS treatment, Fe 0 /PMS treatment achieved superior WAS dewaterability and reduced operational costs. Using PMS combined with Fe 0 and Al 0 treatments under optimal conditions, the water content (Wc) of dewatered sludge decreased to 55.7 ± 2.7 wt% and 59.4 ± 1.3 wt%, respectively. Meanwhile, application of the Fe 0 /PMS treatment system reduced the total annual cost by approximately 33.1%, compared to the Al 0 /PMS treatment. Analysis of the dewatering mechanism demonstrated that in the Fe 0 /PMS treatment, Fe 3+ /Fe 2+ flocculation played an important role in the enhancement of WAS dewatering, while sulfate radical ( S O 4 • − ) oxidation was the dominant factor for WAS dewaterability improvement in Al 0 /PMS treatment. The greater enhancement of WAS dewaterability by Fe 0 /PMS treatment, was mainly attributed to more efficient reduction of hydrophilic extracellular polymeric substances (EPS) and an increase in surface charge neutralization. Environmental risk evaluation results indicated that Fe 0 /PMS and Al 0 /PMS treatments both effectively alleviated the environmental risks of heavy metals and faecal coliforms in dewatered sludge. Overall, this study proposes a novel perspective for the selection of an optimal PMS activator in sludge treatment .
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2021
·
IF 7.963
Yun Pei,Junxian Qin,Jun Wang,Yun Hu
A series of Fe-based metal organic framework derived materials were prepared by thermal treating MIL-100(Fe) in nitrogen atmosphere for adsorption removal of oxygenated volatile organic compounds (OVOCs) such as methanol, formaldehyde and acetone under dynamic conditions. The experimental results showed that the partially carbonized M-350 material obtained by calcining MIL-100(Fe) at 350 °C exhibited the best adsorption performance and high stability. The breakthrough adsorption capacity of M-350 for methanol was 61.5% higher than that of pure MIL-100 (Fe), and it was 24.7, 6.5 and 2.6 times higher than that of commercial activated carbon, ZSM-5 and SAPO-34 adsorbents, respectively. The excellent adsorption performance was attributed to the exposure of abundant coordinatively unsaturated iron metal sites acting as Lewis acid sites through high temperature calcination, which had a strong affinity for OVOCs. Meanwhile, a hierarchical porous structure and high specific surface area further promoted the adsorption. This work provides new insights into the further development of metal organic frameworks based functional materials for VOCs removal and purification.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Weichun Yang,Xiaomin Li,Dongdong Xi,Qi Li,Zhihui Yang,Xiaobo Min,Zhang Lin,Qi Liao
It is a challenge to simultaneously treat the combined pollutants of chromium(VI) (Cr(VI)) and organics (such as phenol) in wastewater. Here, a stable and efficient redox system based on FeS 2 sulfidated zero valent iron (FeS 2 /Fe 0 ) and persulfate (PS) was developed to synchronously remove Cr(VI) and phenol. 100% of phenol (10 mg/L) was oxidized in 10 min and Cr(VI) (20 mg/L) was completely reduced to Cr(III) in 90 min in the FeS 2 /Fe 0 +PS system with a pH range of 3.0–9.0, respectively. phenol was selectively oxidized without re-oxidizing Cr(III) in such system. The surface-bound Fe 2+ was the major reactive species to synchronously reduce Cr(VI) and oxidize phenol. The mechanisms were elucidated that the phenol degradation was accelerated by the generated Cr(III) complexing with its products, and that SO 4 2− , whose production speed was accelerated by the PS activation to oxidize phenol and FeS 2 , was conductive to corrode Fe 0 to regenerate the surface-bound Fe 2+ for reducing Cr(VI) and oxidizing phenol. It is potential to develop a high-performance and large-scaled FeS 2 /Fe 0 -based redox platform to remediate the complex pollution of Cr(VI) and organics.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Superconductivity and Novel Magnetism
·
2021
·Vol. 34
·期 10
·2565-2572
·
IF 1.506
Zhao Caiye,Yi Xiaolei,Hou Qiang,Feng Jiajia,Zhang Yufeng,Xu Mingxiang,Shi Zhixiang
In this work, a series of FeS 1- x Te x (0 ≤ x ≤ 0.15) single crystals were successfully synthesized by a hydrothermal method for the first time. According to the measurement of in-plane resistivity, Hall effect, and magnetoresistance (MR), we find that the superconducting transition temperature T c is rapidly suppressed with the increasing Te substitution, and finally the superconductivity disappears when x > 0.05. With the substitution of Te for S, the residual resistivity ρ 0 increases while the residual resistivity ratio (RRR) decreases monotonously. Meanwhile, the MR of FeS 1- x Te x is also reduced by Te doping. All these results reveal that the Te substitution introduces more impurity scattering. In consequence, the non-linear field-dependent of Hall resistivity ρ xy at low temperature region is suppressed and a linear behavior is restored upon Te doping. The negative Hall coefficients R H for all the FeS 1- x Te x samples suggest that the electron-type carrier dominates the electrical conduction. Moreover, the MR of FeS 1- x Te x obviously follows Kohler’s law, indicating the isotropic scattering rates in the Fermi surface.
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2021
·
IF 5.165
Peng Zhang,Shen-Jing Ji,Dong Zhang,Huai-Guo Xue,Nian-Tzu Suen
Recently, it has been reported that the enstatite chondrite (EC) meteorite may contain enough hydrogen to provide a plausible explanation for water’s initial existence on Earth. Perryite mineral is one of the key components of EC, but its detailed chemical composition and phase width remain elusive compared with other minerals found in EC. Therefore, we embark on a series of investigations of the synthesis, crystal structure, and electronic structure of the synthetic perryite mineral (NixFe1–x)8(TyP1–y)3 (T = Si and Ge; 1 ≥ x, y ≥ 0). Its crystal structures were established based on single-crystal and powder X-ray diffraction techniques. It is realized that its structural and phase stabilities are highly dependent on the nature of the doping element (i.e., Fe and Si). The inclusion of Si and Fe elements can greatly alter the bonding scheme near the Fermi level (Ef), which is vital to the phase stability and accounts for the chemical composition of the natural perryite mineral (quaternary compound) in EC meteorites. Furthermore, this phase exhibits good electrocatalytic activity toward the hydrogen evolution reaction (HER). The best and the worst HER performances are for the Ni8Ge2P and Ni8Si2P samples, respectively, which suggests that the long bond length and high polarity of the covalent bond are the preferred criteria to enhance the electrocatalytic HER in this series.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Guodong Zhang,Guangyue Shi,Wentao Yuan,Yao Liu
In this study, phytic acid (PA) surface treatment was used to prepare iron-based soft magnetic composites (SMCs). The composition and microstructure of the SMCs were analyzed to assess changes in the magnetic properties . As the treatment time increased, the insulating layer on the powder surface gradually thickened, changing the internal morphology and conductive path of the annular samples after compacting. The changes in the magnetic properties and core loss were attributed to the increased resistivity and enhancement of the magnetic dilution effect. The optimal soft magnetic performance ( μ m = 389, P t = 235.1 mW/g measured at 100 kHz and 50 mT) was obtained by adjusting the processing time. This reduces the loss by 52.96% compared to the untreated sample and improves the application potential of soft magnetic composites at medium and high frequencies.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Sisi Zhang,Jiayi Zhu,Xiwang Zhang,Runliang Zhu,Fei Ge,Yin Xu
Zero-valent Cu-Fe bimetallic porous carbon materials were successfully applied to remediate organic wastewater. In this work, we successfully recycled the layered double hydroxides (LDHs) adsorbed with Orange II (OII) to form a zero-valent Cu-Fe bimetallic porous carbon material (CuFe/Carbon). The characterization results showed that CuFe/Carbon was a zero-valent Cu-Fe bimetallic porous graphene-like carbon material. In the course of the experiment, we found that aeration condition had a great influence on the activity of CuFe/Carbon. The removal efficiency of nitrobenzene (NB) was 100 % in nitrogen system and 48 % in air system. The active species of O 2 − and O H was formed under air condition, while there was no active species under nitrogen condition. NB was reduced to aniline directly under nitrogen condition. We proposed there were reduction and oxidation mechanisms under different aeration conditions. This work mainly investigated the conversion process of a novel material under different reaction conditions, which provided theoretical support for the removal of organic matters.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2020
·
IF 3.784
Ying Zhang,Tengfei Han,Meng Xiao,Yifu Shen
(FeNiCoCrTi 0.5 )C x (x = 3 wt%, 6 wt%, 12 wt%) carbonized high-entropy alloy-based composite coatings , marked as C 3 , C 6 and C 12 , were prepared on 45 steel by laser cladding. The macroscopic morphology, phase, microstructure, hardness and wear resistance of coatings have been investigated systematically. The results indicate that diamond content has a significant influence on the microstructure and mechanical properties of (FeNiCoCrTi 0.5 )C x coating. (FeNiCoCrTi 0.5 )C x coatings, without pores and cracks, are well metallurgically bonded with substrate. The coatings consist of BCC solid solution, Cr 23 C 6 and TiC. The addition of diamond in (FeNiCoCrTi 0.5 )C x coating leads to the instability of BCC solid solution and facilitates the precipitation of carbides , which causes carbides to become coarse and aggregate into large blocks. The hardness of (FeNiCoCrTi 0.5 )C x coatings is much higher than that of the 45 steel, the average hardness of C 12 coating is 4 times the hardness of substrate. Besides, the hardness of (FeNiCoCrTi 0.5 )C x coating increases with the increase of diamond content. Nonetheless, compared to C 6 coating, the C 12 coating shows inferior tribological performance due to the brittleness . It is noteworthy that C 6 coating with outstanding wear resistance has the potential to apply in various fields of machinery industry, marine engineering and aerospace.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Zhi Ye,Nan Xu,Duo Li,Junchao Qian,Changsheng Du,Ming Chen
Both green tea (GT) extract and vitamin C (VC) were used for the reduction of Fe 3+ to Fe 0 using a green synthesis method. Modified nanozero-valent iron (GT-nZVI@VC nanocomposites) was successfully obtained and characterized as α-Fe 0 -iron oxide/VC by multiple analytical methods. The GT-nZVI@VC nanocomposites showed better transportability than nZVI , in that transport behavior was slightly dependent on various ratios of sand/soil in water-saturated heterogeneous porous media . Breakthrough curves of GT-nZVI@VC nanocomposites in paddy soil exhibited “blocking effects” and were well described using a first-order straining coefficient (k 2 ) on site 2 obtained from a two-site kinetic attachment model. In particular, GT-nZVI@VC (VC/Fe = 0.6) showed higher Cr(VI) removal (especially reducibility) in both paddy soil and water compared to that of nZVI and VC. It is likely that the synergistic effects of VC (ascorbic acid) and tea polyphenols can increase the released free electrons into solution, favoring the high reduction of Cr(VI) into Cr(III) (i.e., FeOCr 2 O 3 , Cr(OH) 3 and Cr 2 O 3 ), where Cr(III) is prone to be immobilized by the nanocomposites in soil. This research highlights that VC can mediate the activation of GT extract to successfully modify nZVI, which could be beneficial for efficient transport in subsurface and remediation of Cr(VI)-contaminated soil and underground water.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Acta Biomaterialia
·
2020
·
IF 7.242
Jin He,Ju Fang,Pengbo Wei,Yulei Li,Hui Guo,Qingsong Mei,Fuzeng Ren
Three-dimensional (3D) porous zinc (Zn) with a moderate degradation rate is a promising candidate for biodegradable bone scaffolds. However, fabrication of such scaffolds with adequate mechanical properties remains a challenge. Moreover, the composition, crystallography and microstructure of the in vivo degradation products formed at or near the implant-bone interface are still not precisely known. Here, we have fabricated porous [email protected] scaffolds with skeletons consisting of an inner core layer of Fe and an outer shell layer of Zn using template-assisted electrodeposition technique, and systematically evaluated their porous structure, mechanical properties, degradation mechanism, antibacterial ability and in vitro and in vivo biocompatibility. In situ site-specific focused ion beam micromilling and transmission electron microscopy were used to identify the in vivo degradation products at the nanometer scale. The 3D porous [email protected] scaffolds show similar structure and comparable mechanical properties to human cancellous bone. The degradation rates can be adjusted by varying the layer thickness of Zn and Fe. The antibacterial rates reach over 95% against S. aureus and almost 100% against E. coli . A threshold of released Zn ion concentration (~ 0.3 mM) was found to determine the in vitro biocompatibility. Intense new bone formation and ingrowth were observed despite with a slight inflammatory response. The in vivo degradation products were identified to be equiaxed nanocrystalline zinc oxide with dispersed zinc carbonate. This study not only demonstrates the feasibility of porous [email protected] for biodegradable bone implants, but also provides significant insight into the degradation mechanism of porous Zn in physiological environment.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Wenyi Gu,Xiaoyue Huang,Yunhao Tian,Min Cao,Liang Zhou,Yi Zhou,Jian Lu,Juying Lei,Yanbo Zhou,Lingzhi Wang,Yongdi Liu,Jinlong Zhang
Highly efficient removal of tetracycline (TC) has been achieved by cooperative adsorption of carbon and iron in a magnetic Fe/porous carbon hybrid (MagFePC) derived from MIL-101(Fe). The optimum hybrid material MagFePC-700 (obtained from MIL-101(Fe) carbonization at 700 °C had a good adsorption capacity for TC at a wide range of pH, and the highest adsorption capacity was up to 1301.24 mg g −1 at a pH of around 7, which was 6 times higher than that of activated carbon. In addition to TC, it also showed high adsorption capacity (>800 mg g −1 ) for oxytetracycline, chlortetracycline hydrochloride, and tetracycline hydrochloride. The porous carbon in MagFePC-700 was rich in meso- and micropores, which were conducive to the transport and enrichment of TC molecules. Especially, the Fe nanoparticles in the hybrid were found to contribute greatly to the adsorption, which were both the active site of adsorption and the active site of Fenton reaction. A multi-cycle experiment revealed that the MagFePC material was regenerated well through Fenton reaction, and the regeneration conditions were mild without adjusting the pH. Taken it all together, MagFePC-700 is a green and recyclable adsorbent for the removal of antibiotics from water owing to its high adsorption capacity, easy separation, and good reuse performance.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）