DIAMOND AND RELATED MATERIALS
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2023
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IF 4.1
Hanxiao Zhang,Zhengyan Wang,Dandan Wu,Yanlan Zhang,Yongzhen Wang
The production of magnetic biomass-derived carbon-based aerogels has made outstanding contributions to green chemistry and sustainable development so as to alleviate the growing electromagnetic pollution problems. In particular, carboxymethyl cellulose (CMC) possessing three-dimensional (3D) porous structure , low density and biodegradability is an effective precursor for the preparation of magnetic carbon aerogels. In this work, lightweight porous Fe 3 O 4 -Fe/carbon aerogels (FFCA) were synthesized by depositing magnetic metals on chitosan (CS)-reinforced CMC via a facile and eco-friendly strategy. The 3D porous structure and non-homogeneous conductive network endow the FFCA aerogels with comprehensive properties. Specifically, the introduction of magnetic material and the carbonization process under the temperature gradient result in tunable electromagnetic parameters and good impedance matching, allowing electromagnetic waves to enter the absorber and dissipate as much as possible. For instance, the FFCA prepared at 900 °C exhibits the impressive microwave absorption performance due to the synergistic transition between magnetic permeability and dielectric constant, with the minimum reflection loss of −45.5 dB at 2.6 mm and the effective absorption bandwidth of 3.7 GHz. This work provides an important reference for the design of eco-friendly CMC-based magneto-dielectric synergistic microwave absorption materials .
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Mingda Che,Xianfeng Wang,Mei Cui,Renliang Huang,Wei Qi,Rongxin Su
The frequent outbreaks of Phaeocystis globosa ( P. globosa ) blooms in coastal areas have seriously threatened nuclear power safety. In this study, tannic acid (TA) was used to accelerate the removal of P. globosa from seawater by Fe (Ⅱ) activated persulfate (PS). In comparison with the Fe (Ⅱ)-PS system, the higher removal efficiency of P. globosa was obtained in the TA-Fe (Ⅱ)-PS system (91.2% vs 67.5%). The removal efficiency of fluorescence value, chlorophyll a, turbidity and total organic carbon (TOC) reached up to 90.1%, 91.2%, 61.8% and 51.6% with the addition of 10 mg L −1 of TA, 100 mg L −1 of Fe (Ⅱ) and 240 mg L −1 of PS in 420 min. The flocs images confirmed that TA played a dual role in regulating Fe (Ⅱ) concentration and activating PS, which facilitated the pre-oxidation of algae cells. Finally, the inactivated P. globosa settled to the bottom with the iron mineral flocs. In addition, positive environmental impacts were also validated due to the decrease in total organic carbon (TOC), total nitrogen (TN), total phosphorus (TP) and chemical oxygen demand (COD). The findings demonstrated that TA-Fe (Ⅱ)-PS system is a promising candidate for the removal of P. globosa from seawater.
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Nanoscale
·
2023
·Vol. 15
·期 39
·16188-16198
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IF 6.7
Qingxue Lai,Hongmei Zheng,Wanying Zhang,Yi Sheng,Luanjie Nie,Jing Zheng
Fe–N–C catalysts with highly dispersed metal active centers were developed as promising non-precious metal materials for acidic oxygen reduction reaction (ORR) electrocatalysis. However, such kind of novel catalysts still suffer from major challenges in the manipulation of dispersion, utilization, and stability of the Fe-based metal centers. Herein, a N-rich molecular dual-guided pyrolysis strategy was proposed to develop an efficient yolk-shelled Fe–N–C ORR electrocatalyst. A unique yolk-shelled nanostructure with a relatively ordered shell and disordered yolk of a carbon skeleton was controllably constructed via this guided-pyrolysis route from the precursor of Fe-doped zeolitic imidazolate framework-8 (Fe-ZIF-8). Moreover, the atomic-level dispersion of Fe element in the carbon skeleton could be achieved via the dual guidance from phenanthroline and melamine molecules. The optimized Fe–N–C catalyst demonstrated a half-wave potential of 0.78 V vs. RHE in acid media, close to commercial 30% Pt/C, along with a small negative shift of 19 mV after an accelerated durability test. These enhanced electrocatalytic properties could be attributed to the preferred transformation of the Fe precursors to atomically dispersed Fe–Nx active configurations, as well as the enhanced three-phased interfacial reaction kinetics.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 48
·105685-105699
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IF 5.8
Dong Pei,Shan Peipei,Wang Shuaijun,Ge Baosheng,Zhao Chaocheng
In this work, efficient Fenton strategy have been proposed for degradation of shale gas fracturing flow-back wastewater using the spherical Fe/Al 2 O 3 supported catalyst. Prior to actual fracturing fluid treatment, the typical model wastewaters such as p -nitrophenol and polyacrylamide were employed to evaluate the catalytic properties of prepared catalyst, and then Fenton treatment of the shale gas fracturing flow-back wastewater was performed on the self-assembled catalytic degradation reactor for continuous flow purification. Results showed that under the conditions of 0.25 mol L −1 impregnating concentration, pH 4, 50 g L −1 catalyst and 0.75 mL L −1 30% H 2 O 2 , the removal efficiency of p -nitrophenol and polyacrylamide reached 74% and 61%, respectively, while the COD removal of fracturing flow-back fluid was approximately 48% with the residual 88 mg L −1 COD, meeting the emission standards of the integrated wastewater discharge standard (GB 8978-1996, COD < 100 mg L −1 ). This work offers new alternatives for Fenton treatment of real wastewater by efficient and low-cost supported catalysts.
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SENSORS AND ACTUATORS A-PHYSICAL
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2023
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IF 4.6
Haiyang Zhang,Hongyan Zhang,Jianping Man,Chu Chen
A humidity sensor with high performance based on Fe 3+ ions doped with SnO 2 (Fe/SnO 2 ) was synthesized by hydrothermal method and its mechanism was studied by the first principle based on density functional theory . Experimental results show that doping Fe 3+ ions can effectively improve the performance of SnO 2 humidity sensor. Compared with SnO 2 , the resistance of Fe/SnO 2 humidity sensor increases from 4.5 to 5.5 orders of magnitude, the humidity hysteresis error decreases from 42.4% to 3.8% and the response/recovery time changes from 11 s/48 s–10 s/8 s. Calculations show that Fe 3+ ions can enhance the chemical and physical adsorption energy , improving the sensitivity and linearity and reducing the hysteresis error and recovery time of SnO 2 , respectively. Moreover, a simple circuit for respiratory detection was designed based on Fe/SnO 2 , and the number of LED lights can distinguish different breathing states through resistance changes of the Fe/SnO 2 humidity sensor. This study indicate Fe / SnO 2 humidity sensor can be used in non-contact and visual breath detection, which has potential applications in preventing respiratory disease.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2023
·
IF 22.1
Yingying Guo,Chenhui Wang,Yuhang Xiao,Xiaohong Tan,Weidong He,Jianpo Chen,Yan Li,Hao Cui,Chengxin Wang
Fe single-atom catalysts (SACs) have emerged as a promising alternative to platinum for catalyzing oxygen reduction reactions (ORR). Nevertheless, their practical applicability is hindered by insufficient stability caused by structural corrosion during ORR. Here, we developed an effective strategy to optimize and stabilize the Fe SAs (single-atoms) sites by implanting chromium (Cr) atomic clusters (ACs) to address the formidable deactivation issue of the best-performing yet unstable Fe-N-C catalysts. Cr AC -Fe 1 /N-S-C demonstrates an amazing stability with a negligible decline in activity after 100,000 CV cycles, and can maintain 81% of initial current after a continuous 50-hour operation period. Theoretical calculations and experimental evidence substantiate that the integration of Cr ACs not only weakens the binding of OH* to the Fe site, thereby facilitating the ORR process, but also eliminates in situ-generated reactive oxygen species (ROS) and retards Fe ion leaching from active sites, thus stabilizing of the Fe SA sites.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Changyang Liu,Shuting Li,Jianquan Gao,Liuzhen Bian,Yunting Hou,Lijun Wang,Jun Peng,Jinxiao Bao,Xiwen Song,Shengli An
The development of cathode materials with high catalytic activity and low cost is a challenge for CO2 electrolysis based on solid oxide electrolysis cells. Herein, we report a low-cost and highly active metallic Fe nanoparticle-decorated Ruddlesden-Popper (La, Sr)FeO4+δ cathode catalyst (Fe-RPLSF), which shows a high oxygen vacancy concentration and robust CO2 reduction rate. At 850 °C, the current density of the electrolysis cell with the Fe-RPLSF cathode reaches −1920 mA cm–2 at a voltage of 1.5 V, and the Faraday efficiency is as high as 100%. The polarization resistance at low frequency (0.1–10 Hz), which is the rate-limit step for CO2 electrolysis, significantly decreases with the exsolved Fe nanoparticles because of improved CO2 dissociative adsorption. Moreover, our electrolysis cell demonstrates acceptable short-term stability for direct CO2 electrolysis.
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Journal of Water Process Engineering
·
2021
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IF 5.485
Jialin Chen,Ruina Zhang,Dong Chen,Jianyong Liu,Shanping Chen
The generation process for the highly reductive carbon dioxide radical ( CO 2 − ) in the Fe(III)-oxalate system is enhanced under UV irradiation and used in nitrate (NO 3 − ) reduction with improved product selectivity to nitrogen (N 2 ). The combination of Fe(III) and residual oxalate forms Fe(III)-oxalate complexes again for an Fe(II)/Fe(III) species cycle and achieves generation of CO 2 − radical continually. The electron paramagnetic resonance (EPR) spectrum demonstrates the existence of CO 2 − radicals in this process. Some of the important control factors, such as initial concentrations of ferric ions (Fe(III)) (0.5, 1, 2, and 3 mM), NO 3 − (14, 21, and 42 mg N/L), oxalate (3, 7, and 10 mM), and pH values (2, 3, 4, 5, and 6), are systematically assessed for NO 3 − reduction efficiency and N-species selectivity. Among all the control factors mentioned, pH is a key parameter with an important role in the NO 3 − reduction process. Excellent NO 3 − reduction efficiency (∼90 %) was achieved at pH 3 in the presence of 1 mM Fe(III) and 10 mM oxalate under UV irradiation for 120 min. High Fe(III) and oxalate concentrations promote NO 3 − removal. In addition, there was an increase in the NO 3 − removal amount with a greater initial NO 3 − concentration. About 60 % of NO 3 − can be selectively reduced to N 2 with low selectivity to NO 2 − (∼3.4 % of total N) and NH 4 + (∼15.7 % of total N). In general, the UV/Fe(III)-oxalate system provided an alternative way to improve NO 3 − removal performance and selectivity to form N 2 in water and wastewater remediation processes.
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CHEMOSPHERE
·
2021
·
IF 7.086
Liyuan Wu,Pengpeng Guo,Xin Wang,Haiyan Li,Angzhen Li,Kaiyu Chen
Peroxymonosulfate (PMS) activation methods have attractive advantages in advanced oxidation process (AOPs) due to their powerful ability of directly or indirectly generating various reactive oxygen species (ROS). Herein, trace amount of Fe(III) ions were added into the commercial-CoS 2 /PMS system to improve the CoS 2 /PMS decomposition for organics removal. The organics removal efficiency could reach >90% towards methylene blue (MB), diclofenac sodium (DCF), sulfamethoxazole (SMX) and bisphenol A (BPA) in the CoS 2 /Fe(III)/PMS system, with the kinetic apparent rate constant k obs of 0.141, 0.206, 0.247 and 0.091 min −1 , respectively. The synergistic effect between Fe(III) ions and sulfur-vacancies on CoS 2 for PMS degradation were revealed for the first time in cobalt sulfides/PMS system. Quenching experiments and ESR analysis proved that 1 O 2 was the major ROS and was produced mainly by the hydrolysis of SO 5 • – . Besides, the high degradation efficiency was obtained by the contribution of SO 4 • – and • OH. Electron spin–resonance spectroscopy (ESR), cyclic voltammetry (CV) and Raman spectrum data revealed that the addition of Fe(III) ions could optimize the intensity of sulfur vacancies on the CoS 2 surface, which hindered the PMS reduction ability of Co(II), but accelerated the PMS oxidation to form 1 O 2 . The degradation path of MB was analyzed by liquid chromatograph-mass spectrometer (LC-MS). The mechanism studies speculated that the sulfur vacancies of CoS 2 provided the binding sites for Fe(III) ions with Co(II), which facilitated the PMS activation by Co(III).
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Ping-An Yang,Yuxuan Huang,Rui Li,Xin Huang,Haibo Ruan,Mengjie Shou,Wanjun Li,Yuxin Zhang,Nan Li,Lichao Dong
Ag-coated Fe (Fe@Ag) core–shell nanowires (NWs) with enhanced electromagnetic wave absorption were successfully synthesized by the liquid-phase reduction method and the layer-plus-island growth mode. Changing the molar ratio of Fe to Ag controlled the Ag shell thickness to produce different impedance matching and attenuation constants of the Fe@Ag core–shell NWs. The Fe@Ag core–shell NWs with a Fe:Ag ratio of 2:1 significantly improved optimal microwave absorption performance as compared to raw Fe NWs. At a mass fraction of 25%, the minimum reflection loss (RL min ) can reach − 58.69 dB at 7.53 GHz with a matching absorber thickness of 3.36 mm. In addition, the effective absorption bandwidth (EAB, RL ≤ − 10 dB) can be extended to 7.32 GHz, to cover the majority of the C and X bands. Three major aspects contribute to the superior microwave absorption performance: the complementary effect of the polarization of Fe-Ag interface, the impedance matching improvement stems from a proper eddy current, and the small-scale effect caused by a one-dimensional structure. This study demonstrates the promising high-efficiency microwave absorbing capabilities of Fe@Ag core–shell NWs for future use in practical applications.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Huihui Wu,Jingjing Yan,Xin Xu,Qianhui Yuan,Jinhang Wang,Jun Cui,Aijun Lin
Advanced oxidation processes (AOPs) are promising ways for oxidative degradation of organic pollutants. Atom-dispersed transition metal–nitrogen–carbon (M–N–C) materials exhibit excellent efficiency in activating peroxide bonds and have been extensively pursued for environmental remediation. However, M–N–C with single atoms suffer from intrinsic performance limit of complicated catalytic reactions due to structural simplicity and lack of synergistic active sites. Herein, derived from Fe/Cu–coordinated zeolitic imidazolate frameworks with molecular-scale cages, a well–designed catalyst featuring Fe–Cu dual–metal sites coordinated with N–doped carbon (Fe/Cu–N–C) was fabricated. Compared to the single-atom iron catalyst (Fe–N–C), Fe/Cu–N–C significantly enhanced the chloramphenicol removal rate from 0.073 to 0.093 min −1 due to the synergistic effects of Fe–Cu dual active site. Furthermore, Fe/Cu–N–C exhibits fantastic reactivity for peroxydisulfate (PDS) activation in a wide pH range (3.1 – 10.3). Density functional theory calculations revealed that Fe/Cu–N is the major active site, where electrons transfer from Cu to Fe ensure the low-valence state of Fe for catalytic oxidation. Besides, the optimization of adjacent Cu–N sites improves the bonding orbital distribution of Fe 3d orbitals and promotes the adsorption and cracking of PDS. These findings reveal the cooperative mechanism of Fe–Cu dual–atom site on PDS activation and develop a promising platform toward environmental purification.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Yue Yin,Ruolin Lv,Xiaoyang Li,Lu Lv,Weiming Zhang
Bimetallic Fenton catalyst has attracted widespread attention in refractory organics removal. Herein, we firstly investigated the influence of ZrO 2 structure features on H 2 O 2 activation in Zr-Fe bimetallic catalyst. The results show that the heterojunction structure will be formed after high temperature calcination , which makes the ability of Zr-Fe bimetallic catalyst to activate H 2 O 2 for bisphenol A degradation is 3.1 times higher than that of α-Fe 2 O 3 without Zr doping. Through characterization and density functional theory, it was identified that compared to (1 1 0) interface, the adsorption energy of H 2 O 2 on iron sites at (1 1 0)-(1 0 0) interface reduced by 1.27 kJ mol −1 , while the Fe–O bond length in the stable configuration of Fe-OOH increased by 0.16 Å, which was beneficial to the association and dissociation of H 2 O 2 on iron sites. Besides, the surface -OH of amorphous ZrO 2 in Zr-Fe bimetallic catalyst synthesized under low temperature conditions could promote HO 2 • /O 2 •- formation through the surface electron transfer, accelerating the Fe(III) reduction. In conclusion, this study reveals the influence of environment-friendly ZrO 2 structure features on H 2 O 2 activation, proposes a new insight into strengthening the synergistic effect between bimetals, and provides a reference for the structural optimization of bimetallic catalysts.
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