INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2020
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IF 4.939
Liping Zhao,Anqi Wang,Ailin Yang,Guihong Zuo,Jun Dai,Youjin Zheng
Exploring electrocatalysts with low cost and excellent performance for oxygen reduction reaction is still a significant challenge. In this paper, we introduce a novel strategy to fabricate ZnS, Fe, and P co-doped N enriched carbon (ZnFeSP/NC) via the direct carbonization of PVP/ZIF-8 combined with absorption, sulphurization , and phosphorization processes. The as-synthesized ZnFeSP/NC was used as electrocatalyst for oxygen reduction reaction (ORR). We explored the influence of Fe, S, and P elements on the ORR activity of the catalysts. It can be found that ZnS nanoparticles were formed and attached on the surface of the ZnFeSP/NC nanoparticles. α-Fe and P element were well dispersed on ZnFeSP/NC nanoparticles. Fe, S, and P element can highly enhance the ORR activity of the catalysts. Compared to Zn/NC, ZnFe/NC, and ZnFeS/CN, ZnFeSP/NC shows the optimal ORR performance with the half-wave potential of 0.859 V and a current density of 3.33 mA cm −2 at −0.85 V. Furthermore, ZnFeSP/NC also exhibits excellent long-term operation stability, effectively avoiding any ORR performance decay.
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ACS Sustainable Chemistry & Engineering
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2021
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IF 8.198
Yafu Tang,Yuechao Yang,Shanmin Hou,Dongdong Cheng,Yuanyuan Yao,Shugang Zhang,Jiazhuo Xie,Xiaoqi Wang,Xiaoxiao Ma,Zhen Yu,Shan Li
Iron (Fe) chelated by water-soluble humic substances can effectively overcome plant micronutrient deficiencies. However, the traditional synthesis methods are often complex, expensive, and thus not applicable to large-scale industrial productions. In this work, an ecofriendly and multifunctional Fe–humic acid (HA) complex was successfully prepared through simply ball milling lignite with double-shelled Fe–N hollow mesoporous carbon microspheres (DS–Fe–N–HC). The novel DS–Fe–N–HC was synthesized using a simple strategy and was first applied in activating HA from lignite by solid-phase ball milling to attain the water-soluble HA–iron fertilizer (WHIF). The physicochemical properties of the DS–Fe–N–HC nanocomposites and WHIF were systematically characterized by a series of techniques. A traditional Fe–HA complex is mainly obtained by mixing HA and iron ions, which has poor water solubility because HA is not activated. In comparison to samples prepared with other methods, WHIF contained more stable water-soluble HA. Furthermore, the as-obtained WHIF had higher amounts of proteins and amino sugar tannin as evidenced in FT-ICR MS analysis. Moreover, WHIF contributed to higher activities in chlorophyll content, height, steam diameter, and biomass of peanuts than other samples. The results demonstrate that WHIF is effective in reducing symptoms of iron deficiency in peanuts, which can be attributed to its iron-based compounds and water-soluble HA. The findings of this study provide a promising, cost-effective, and environmentally friendly solution to mitigate iron deficiency and promote the growth of peanuts for large-scale agriculture production.
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CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Fanxu Meng,Zhenjie Li,Cheng Lei,Kun Yang,Daohui Lin
Nanoscale zero-valent iron (nZVI) is widely studied for environmental remediation in recent years. However, its easy agglomeration, vulnerable oxidation, and runoff limit its practical application. Herein, iron-based lignin-derived biochar composites (Fe-LBC) with different Fe/C ratios were synthesized using a facile carbothermal reduction method and applied for trichloroethene (TCE) removal from anaerobic water. The synthesized Fe-LBC was equipped with higher specific surface area, more uniform nanoparticles distribution, and higher iron carbide content with the decrease of Fe/C ratio from about 1:5 (Fe-LBC 5 ) to 1:30 (Fe-LBC 30 ). TCE removal by Fe-LBC firstly increased as the Fe/C ratio increased from 1:10 6 to 1:10 3 , and then decreased with the Fe/C ratio further increased to 1:5. The removal efficiency remained largely stable (97.0–98.5%) within the Fe/C ratio range of 1:10 4 -1:30. Fe-LBC 30 (1.0 g L −1 ) could remove 97.4% of TCE (10.4 mg L −1 ), and owned the highest dechlorination efficiency (30.0%). Iron carbides but not Fe 0 could mainly contribute to the dechlorination. The quenching experiment reveals atomic hydrogen (H*) formed under the catalysis of iron carbides, and 1,2-dichloroethene was identified as the main degradation product derived from hydrogenolysis; electrochemical analyses suggest iron carbides could also serve as electron donors to TCE. Moreover, Fe-LBC 30 maintained excellent TCE removal efficiency in various water matrixes and pH range of 3–9, revealing its high application potential in practical groundwater remediation. This work firstly demonstrated the reductive dechlorination action of iron carbides rather than nZVI in iron-biochar hybrid materials, boosting our knowledge and potential application of iron-based materials.
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Journal of Environmental Chemical Engineering
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2020
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IF 4.3
Shanshan Chen,Zhongyang Zang,Shusheng Zhang,Gangfeng Ouyang,Runping Han
Metal-organic framework and nano carbon materials were widely used in separation field in recent years. In this study, nanocomposite of MIL-100(Fe) and multi-walled carbon nanotubes (MIL-100(Fe)-CNTs) was prepared and characterized and its adsorption property towards Oxytetracycline (OTC) was presented. MIL-100(Fe)-CNTs exhibits higher adsorption capacity compared to MIL-100(Fe), making this composite as one of the favorable adsorbents. The adsorption capacity of MIL-100(Fe)-CNTs reached 429 mg·g −1 at 313 K. The langmuir model and Koble-Corrigan model were better to predict the equilibrium data while the pseudo-second-order kinetic model could well describe the kinetic process. The process was endothermic and spontaneous while the ion exchange was the main adsorption mechanism of OTC on MIL-100(Fe)-CNTs. The nanocomposite is promising to effectively remove OTC from solution.
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
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2020
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IF 6.444
Xueai Li,Wenqi Dong,Can Zhang,Wanchun Guo,Chunsheng Wang,Yingmei Li,Haiyan Wang
Two-dimensional microwave-absorbing materials (MAMs) with abundant preferable interfaces are highly desirable for high-performance microwave absorption. Herein, a leaf-like Fe/C structure, consisting of iron veins interpenetrated in amorphous carbon lamina, was fabricated by reducing a petal-like iron alkoxide in an H 2 /Ar atmosphere. The synthesized leaf-like Fe/C composites dissipate microwaves in an effectively similar process green to leaves absorbing sunlight. First, the unique leaf-like structure enables microwaves to pass into the composites because the 2D amorphous carbon, with its high BET surface area, provide adequate access for microwaves. Then, the incident microwave is attenuated by the distinctly improved dielectric loss caused by enhanced interface polarization and an effective magnetic loss from the natural resonance of iron. Therefore, the leaf- like Fe/C composite shows microwave absorption with a maximum reflection loss of − 59.7 dB, whose effective bandwidth (reflection loss ≤ − 10 dB) covers the whole Ku band and X band with thicknesses of only 1.5 mm and 2.0 mm, respectively.
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SENSORS AND ACTUATORS B-CHEMICAL
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2020
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IF 7.1
Li Hou,Yuemei Qin,Tianran Lin,Ying Sun,Fanggui Ye,Shulin Zhao
The synthesized Fe-MIL-88NH 2 was used as a nanozyme and fluorescence probe to successfully construct a selective fluorescent sensing platform for one step determination of catechol. Fe-MIL-88NH 2 exhibited excellent peroxidase mimic property as well as fluorescence property. With the addition of H 2 O 2 and catechol, Fe-MIL-88NH 2 would catalyze the H 2 O 2 to form hydroxyl radicals ( OH). Then, the oxidation of catechol would be triggered by the formed OH, which resulted in the generation of 1, 2-benzoquinone. Afterwards, Michael reaction between the oxidation products of catechol (1, 2-benzoquinone) and Fe-MIL-88NH 2 ligands was triggered and then quenched the fluorescence of Fe-MIL-88NH 2 . The principle of the selective determination of catechol was due to the assistant effect of Michael reaction. Based on the above sensing mechanism, a fluorescent sensing platform for the determination of catechol was established. The limit of detection was 0.0913 μmol L −1 (3S 0, n=8 /K) within a fast response of 10 min. This simple and selective strategy, based on the Michael reaction and the superiority of Fe-MIL-88NH 2 nanozyme, provided a concise sensing platform for catechol determination, which broadened the scope of application of nanozyme and showed a great potential application for on-site testing in food and biology analysis.
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SCIENCE OF THE TOTAL ENVIRONMENT
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2020
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IF 6.551
Dan Wang,Haijun Zhang,Yun Fan,Rong Cao,Yuan Gao,Jiping Chen
The direct chlorination of dibenzo- p -dioxin (DD) and dibenzofuran (DF) is an important source of dioxins in combustion flue gas . The chlorination reaction mainly occurs via electrophilic substitution induced by Cu and Fe chlorides, which must cohabit on particulate matters in mixed state. To explore the mechanism for DD/DF chlorination in real combustions flue gas, 8 kinds of CuO/Fe 2 O 3 /CuCl 2 /FeCl 3 composites impregnated onto silica powder were prepared to simulate the coexisting state of Cu and Fe species in combustion flue gas. Mixed Cu and Fe oxides and chlorides induced a significant synergistic effect on electrophilic chlorination of DD/DF. The efficiencies of DD/DF chlorination over composites containing both Cu and Fe species were 1–2 orders of magnitude higher than those over composites containing only Fe species at 250 °C. CuCl 2 species were highly active sites for electrophilic chlorination. FeCl 3 acted as an excellent promoter to accelerate DD/DF chlorination over CuCl 2 species. The elevated proportion of Cu and Fe oxides was also favora ble for electrophilic chlorination. Compared with DF, DD was more prone to be chlorinated. Chlorine substitution primarily occurred at 2, 3, 7 and 8 positions of DD and DF. Furthermore, the possible mechanism for synergistic effect on electrophilic chlorination of DD/DF was speculated.
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PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2020
·Vol. 27
·期 30
·37839-37851
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IF 3.056
Xu Jun,Xu Jinmei,Jiang Shanqing,Cao Yu,Xu Kailin,Zhang Qiuya,Wang Liping
In this work, a novel visible light–driven heterostructure Ag 3 PO 4 /MIL-100(Fe) composite photocatalyst was successfully synthesized via facile chemical deposition method at room temperature. Especially when the mass ratio of Ag 3 PO 4 was 20% of MIL-100(Fe) (APM-2), it displayed the best photocatalytic performance, for which the degradation rate of tetracycline (TC) in conventional environment was 6.8 times higher than that of bare MIL-100(Fe). In addition, the effects of the initial concentration and pH of the solution on the degradation of tetracycline were also studied, and the results showed that the degradation of tetracycline was more favorable in a weakly alkaline environment. The excellent performance of Ag 3 PO 4 /MIL-100(Fe) composites was attributed to the fact that on the basis of having adequate photocatalytic active sites, modifying MIL-100(Fe) with an appropriate amount of Ag 3 PO 4 particles can more effectively separate photogenerated electron–hole pairs. Five cycles of experiments showed that APM-2 has good photostability. Lastly, it was proved through quenching experiments that •O 2 − , h + , and •OH all played corresponding roles in the degradation process, and a possible Z-scheme heterostructure photocatalytic degradation mechanism was proposed.
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PubMed
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Nanoscale
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2021
·Vol. 13
·期 31
·13463-13472
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IF 7.79
Ya-Nan Zhou,Ruo-Yao Fan,Yu-Ning Cao,Hui-Ying Wang,Bin Dong,Hui-Ying Zhao,Fu-Li Wang,Jian-Feng Yu,Yong-Ming Chai
The oriented distribution and strong bonding of Fe active sites in multiple metal hydroxides are crucial to modulate activity and stability for efficient oxygen evolution reaction (OER). However, the dispersion and inevitable dissolution of Fe species still need to be addressed through deliberate design. Here, trace amounts of Fe chelated with tannic acid (TA) are precisely anchored to ultrathin Co hydroxides (TF@Co(OH)2-t) through a new anodic interfacial coordination assembly strategy: firstly, the ZIF-67@Co(OH)2 precursor with ultrathin Co(OH)2 nanosheets vertically grown on the shell, provides abundant active sites and sufficient anchoring regions for subsequent TA–Fe coating; secondly, the TA–Fe ligand network quickly and robustly coats the surface of the Co(OH)2via positive potential-driven chronopotentiometry, yielding TF@Co(OH)2-t with good dispersion and controllable Fe species. The TA–Fe network efficiently activates Co species and prevents the dissolution of Fe ions. Physical characterization and DFT simulations reveal that the optimized OER activity with 317 mV at 10 mA cm−2 for TF@Co(OH)2-500 can be attributed to the accelerated electron transfer, increased active sites, and the moderate fall in d-band center levels due to Fe integration. Moreover, prolonged stability is realized benefiting from the robust TA–Fe coating protecting the actives sites.
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CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Chunfeng Shao,Lingmin Wu,Yinghua Wang,Konggang Qu,Hailiang Chu,Lixian Sun,Jianshan Ye,Baitao Li,Xiujun Wang
Single-atom catalysts (SACs) have sparked intense interest in heterogeneous catalysis lately, but insufficient accessibility of active sites restricts their further applications. Herein, a hydrangea-like carbon nanoparticle possessing highly open nanospaces and enhanced external surface area that fully exposes the catalytic sites is reported. By introducing mesoporous silica nanoparticles (MSNs), Fe-doping zeolitic imidazolate framework-8 (ZIF-8) precursors are assembled into a flower-like superstructure interlaced by porous nanosheets, which expand from inside out constructing an open and interconnected architecture. This unique structure can substantially liberate the densely dispersed but deeply buried Fe-N 4 sites inside carbon nanoparticles and accelerate mass transfer in the catalyst layer that increases active-site utilization. Furthermore, the physical and chemical properties of the assembled catalysts can be adjusted by the diameter (200, 300, and 500 nm) of MSNs. When the diameter was 500 nm, the optimal FeNC-F3 catalyst exhibited large specific surface area, maximum metal centers utilization, high oxygen reduction reaction efficiency, and excellent stability. The novel cathodic electrocatalyst achieved high power density of 0.32 mW cm −2 in microbial fuel cell and 288 mW cm −2 in Zn-air battery. This work established a realistic strategy for promoting the practical development of fuel cell catalysts.
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ENERGY
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2021
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IF 7.147
Xiuquan Li,Zhongqing Yang,Li Zhang,Ziqiang He,Ruiming Fang,Ziqi Wang,Yunfei Yan,Jingyu Ran
The catalytic reaction of C 2 H 6 with CO 2 provides an opportunity to use shale gas and the greenhouse gas as source materials to produce ethylene through oxidative dehydrogenation or produce syngas through dry reforming . In this work, the reaction characteristics of ethane with CO 2 on Fe/Co/Ni/Cu monometallic catalysts and Pd-doped bimetallic catalysts were studied through activity test, kinetic analysis , catalyst characterization and DFT calculation. It is found that Pd–Fe 6 /CeO 2 has a high and stable C 2 H 4 selectivity of 80.4%, which is suitable for oxidative dehydrogenation reaction, while Ni 6 /CeO 2 has a large ethane/CO 2 conversion and a high CO selectivity of 96.5%, which is suitable for dry reforming reaction. For Fe-based catalyst, the doping of Pd form double active component structure. It only reduces the energy barrier of ethylene formation and CO 2 direct activation to provide O∗, but also increases the energy barrier of ethylene deep dehydrogenation, thus increasing the conversion of reactants and selectivity of C 2 H 4 . For Ni-based catalysts, the doping of Pd forms the alloy structure, which reduces the energy barrier of O∗-assisted dehydrogenation reaction and increases the conversion of reactants, but increases the energy barrier of C–C bond cleavage and CO 2 activation reaction, which reduces the selectivity of reforming to syngas.
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FUEL
·
2021
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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.
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