CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Zelai Cheng,Liming Xu,Xi Wang,Xiaohui Wu,Fangyi Huang,Yulan Jing,Hua Su
Gillespite-type SrCu 0.95 B 0.05 (B 2+ :Cu,Co,Mn,Ni,Mg,Zn)Si 4 O 10 (SCBS) ceramics were prepared by high-temperature solid-state method. Their microwave dielectric properties and crystal structure evolution were studied by P–V-L theory, bond valence model, and X-ray photoelectron spectroscopy. Varying B 2+ ion changed ionic polarizability and bond ionicity, causing dielectric constant ε r of SCBS to change. The change in quality factor Q × f was explained by lattice energy, oxidation state of Cu, and internal strain/fluctuation. The temperature coefficient of resonator frequency τ f was regulated by B–O bond length and valence. The optimal microwave dielectric properties were exhibited by SrCu 0.95 Mn 0.05 Si 4 O 10 after sintering at 1050 °C: ε r ∼5.8 ± 0.03, Q × f ∼65,589 ± 2611 GHz (@15.8 GHz), and τ f ∼ -50 ± 4 ppm/°C. These materials show great potential application prospects for 5G/6G wireless communication.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Mengxia Shen,Jiale Qi,Kun Gao,Chao Duan,Jun Liu,Qingqing Liu,Hao Yang,Yonghao Ni
Fe-N x C single-atom catalysts have been immensely explored as the most promising ORR catalysts for replacing noble metals. Nevertheless, how to precisely introduce Fe atoms to optimize their spatial distribution and coordination environment in carbonaceous matrices while constructing the hierarchical porous structures to facilitate the mass transport process and ensure the accessibility of Fe-N x sites remain significant challenges. Here, we propose a strategy to prepare porous N -doped carbon aerogels anchored with single atomic Fe sites (Fe-SA@PNC) as highly efficient ORR electrocatalysts via directional freeze-casting and chemical vapor deposition. Fe-SA@PNC exhibit remarkable ORR activity and stability due to the highly stable honeycomb morphology and hierarchical pore structure, as well as the atomically dispersed Fe-N 4 sites in the carbon support. Furthermore, the practical application of Fe-SA@PNC catalysts as cathode materials in Zn-air batteries was demonstrated with encouraging performance. This study provides a promising approach for constructing high-efficiency ORR single-atom catalysts.
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JOURNAL OF THE ENERGY INSTITUTE
·
2019
·
IF 3.774
Yunwu Zheng,Zhen Wang,Can Liu,Lei Tao,Yuanbo Huang,Zhifeng Zheng
By introducing exogenous nitrogen during biomass pyrolysis under nitrogen-rich conditions, high-value nitrogen-containing products, i.e., nitrogen-rich char and oil may be produced. Based on the cogeneration of high-value nitrogen products from biomass, biomass nitrogen-enriched pyrolysis was performed in a fixed bed with different sources and contents of ammonia. The yields, composition and characteristics of the products were investigated. Moreover, the formation mechanism of N-containing species was explored in depth for the pyrolysis and catalytic pyrolysis with HZSM-5 and Zn/HZSM-5 catalysts via elemental analysis, XPS, FTIR and BET. The results showed that ammonia impregnation could promote a Maillard reaction, reduce the content of small aldehydes and ketones, and produce a nitrogen-enriched bio-oil. The contents of N-containing species and phenolic substances in the pyrolysis oil of biomass impregnated with 10% urea reached 15.66% and 56.69%, respectively. Moreover, the nitrogen on the coke surface after pretreatment was mainly composed of C N, C N and N COO functional groups. The bio-char generated abundant pyridinic-N, pyrrolic-N, quaternary-N, and pyridone-N oxides. The presence of urea introduced many alkaline N-containing functional groups on the surface of the bio-char and promoted the transformation of nitrogen from amides and imides to heterocyclic nitrogen with higher thermal stability. Furthermore, Zn was an excellent catalyst for the Maillard reaction, and the Zn/HZSM-5 catalyst had a higher selectivity for aromatic hydrocarbons (96.98% for biomass and 86.48% for urea/biomass) and N-containing heterocyclic compounds, such as indoles (6.16% for biomass and 13.51% for urea/biomass). Additionally, the coke content decreased, and the catalyst deactivation decreased.
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ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2018
·
IF 3.974
Di Guo,Amjad Ali,Chunyan Ren,Juan Du,Ronghua Li,Altaf Hussain Lahori,Ran Xiao,Ziyang Zhang,Zengqiang Zhang
Phytoremediation of contaminated soil is an in-situ reclamation technique for removal of potentially toxic metals through hyperaccumulator plants. Potherb mustard ( Brassica juncea, Coss. ) is less explored for its assisted phytoextraction potential to restore and accelerate potentially toxic metals removal from smelter-contaminated soil. In this study, different levels of ethylene diamine tetraacetic acid (EDTA) alone and combined with citric acid (CA) and oxalic acid (OA) were applied in a greenhouse pot experiment. Chelates added on 25th d and 25/35th d after sowing, enhanced cadmium (Cd) and zinc (Zn) bioavailability in soil due to complexation. As a result, Cd and Zn in shoot and root were significantly amplified by 1.7, 2.15 and 1.93, 2.7 folds than control, respectively. Shoot and root dry weight significantly reduced and ranged between 4.13–9.91 and 0.21–0.77 g pot −1 , respectively. The toxicity induced by potentially toxic metals in plant imposed a series of biological responses. Plant antioxidants like Phenylalanine ammomialyase (PAL), polyphenol oxidase (PPO) Catalase (CAT) content increased, except the peroxidase (POD) with the addition of chelating agents . Besides, biological concentration factor (BCF) of Cd and Zn, translocation factor (TF) of Cd were notably elevated (>1.0), while TF of Zn was reduced. Pearson correlation analysis showed a positive relation between DTPA-extractable and shoot concentration of Cd and Zn, whereas it showed negative correlation with plant dry weight. In general, chelate-assisted phytoremediation of smelter contaminated soil proved effective in this study, and followed the order: EDTA > EDTA + CA ≈ EDTA + OA > CK.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Lili Huang,Shengpeng Mo,Xin Zhao,Jiangjing Zhou,Xiaobin Zhou,Yanan Zhang,Yinming Fan,Qinglin Xie,Bing Li,Junhua Li
Herein, a core-shell structured Co 3 S 4 /NC@ZnS/NC heterojunction has been constructed via elaborately synthesizing metal-organic framework (MOF)-on-MOF precursors (ZIF-67@ZIF-8) and following controlled carbonization-sulfidation processes. The developed Co 3 S 4 /NC@ZnS/NC achieves higher performances for CO 2 photoreduction with water vapor towards CO (28.44 μmol g −1 h −1 ), CH 4 (1.93 μmol g −1 h −1 ) and C 2 H 4 (12.23 μmol g −1 h −1 ) in a continuous-flow condition under visible-light irradiation, which are significantly superior than those of Co 3 S 4 /NC and ZnS/NC. 13 CO 2 isotope tracer analysis verifies that CO, CH 4 and C 2 H 4 originate from the carbon source of CO 2 . Experiments and DFT calculations confirm that constructing an electron transport layer (ZnS/NC) in Co 3 S 4 /NC@ZnS/NC can contribute to a feasible channel for the enhanced separation and transfer of charge carriers. In heterojunction , non-bonding Co and Zn atomic pairs as adsorption sites synergistically participate in the CO 2 activation through the unique electron transport channel and acquire the lower energy barriers of COOH* formation. Moreover, in situ DRIFTS reveals the key intermediates and possible conversion pathways to main products. This work presents an attractive strategy to construct dual MOFs-derived metal sulfide heterojunctions for high-performance CO 2 conversion.
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MICROCHIMICA ACTA
·
2017
·Vol. 184
·期 12
·4731-4740
·
IF 4.58
Lu Zhiwei,Zhang Junjun,Dai Wanlin,Lin Xueni,Ye Jiaping,Ye Jianshan
The authors report on a disposable sensor for the differential pulse anodic stripping voltammetric (DPASV) determination of the ions Zn(II), Pb(II) and Cu(II). Simultaneous detection is accomplished by using a screen-printed carbon electrode (SPCE) co-modified with an in-situ plated bismuth (Bi)) film and gold nanoparticles (AuNPs). The synergistic effect of the Bi film, and the large surface and good electrical conductivity of the AuNPs strongly assist in the co-deposition of the three ions. Four well-defined and fully separated anodic stripping peaks, at 540 mV for Zn(II), 50 mV for Pb(II), 140 mV for Bi(III) and 295 mV for Cu(II), all vs. Ag/AgCl, can be seen. The modified SPCE was characterized by scanning electron microscopy, X-ray diffraction, cyclic voltammetry and electrochemical impedance spectroscopy. Under the optimized conditions, the sensor has a good response to these ions. The detection limits (at an S/N ratio of 3) are 50 ng·L −1 for Zn(II), 20 ng·L −1 for Pb(II), and 30 ng·L −1 for Cu(II). The method was applied to the determination of the 3 ions in spiked lake water samples.
Schematic of screen-printed carbon electrode (SPCE) co-modified with a bismuth film and gold nanoparticles for electrochemical simultaneous determination of Zn(II), Pb(II) and Cu(II) by differential pulse anodic stripping voltammetric (DPASV).
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JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
·
2013
·Vol. 28
·期 7
·1110-1117
·
IF 3.155
Chao Cui,Bin Hu,Beibei Chen,Man He
Ionic liquids of methyltrioctylammonium chloride modified magnetic nanoparticles were prepared, and a new method of magnetic solid phase extraction combined with inductively coupled plasma-optical emission spectrometry was established for the determination of Cu, Zn, and Cd in human hair and urine samples. The effect of pH on the extraction of Cu, Zn, and Cd was investigated. The results show that the ionic liquid played a key role in the extraction of target analytes. The magnetic nanoparticles served as the carriers of the ionic liquid and the base of the phase separation. Several parameters affecting the extraction and desorption of the target analytes were investigated including the sample volume, extraction time, eluent concentration and volume, desorption time, sedimentation time, amount of the ionic liquid and Fe3O4@Si–OH, and the optimized conditions were established. Under the optimized conditions, the detection limits of Cu, Zn, and Cd were 0.54, 0.56, and 0.33 μg L−1, respectively, and the relative standard deviations (n = 7) were 4.9% (c = 2 μg L−1), 3.7% (c = 2 μg L−1), and 5.1% (c = 1 μg L−1), respectively. To validate the accuracy of the proposed method, it was applied to analyze certified reference materials of GBW07601 human hair and GBW09103 human urine. The determined values agree with the certified values. The developed method was also employed to analyze human hair and urine, and the recoveries for the spiked samples were in the range of 89.1% to 120%. The developed method was simple, highly sensitive, solvent-free, chelate-free, and could be considered as a green analytical technique.
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Polymer Chemistry
·
2014
·Vol. 5
·期 21
·6171-6179
·
IF 5.368
Shunjie Liu,Yusheng Qin,Xuesi Chen,Xianhong Wang,Fosong Wang
A one-pot synthesis of oligo(carbonate-ether) triol was realized by the copolymerization of CO2 and propylene oxide (PO) using a zinc-cobalt double metal cyanide (Zn-Co-DMC) catalyst in the presence of 1,3,5-benzenetricarboxylic (trimesic) acid (TMA). The catalytic activity ranged from 0.3 to 1.0 kg g−1 DMC under various copolymerization conditions. The structure of the oligo(carbonate-ether) triol was clearly confirmed, providing sound evidence for the special role played by the TMA, i.e., that it acted as an initiation-transfer agent. In the first stage the TMA initiated PO homo-polymerization to afford oligo-ether triol via a core-first approach in the presence of Zn-Co-DMC. After all of the TMA was consumed, the in situ formed oligo-ether triol acted as new chain transfer agent to participate in the copolymerization, forming carbonate-ether segments and therefore the oligo(carbonate-ether) triol. Since every molecule of TMA participated in initiation and propagation steps, the molecular weight of the triol depended on the amount of TMA used rather than the amount of Zn-Co-DMC. Consequently, the number average molecular weight (Mn) of the oligo(carbonate-ether) triol could be well controlled from 1400 to 3800 g mol−1 with a relatively narrow polydispersity index (PDI) (1.15–1.45), and its carbonate unit content (CU) could be adjusted between 20% and 54%.
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Science China-Chemistry
·
2013
·Vol. 56
·期 11
·1651-1657
·
IF 1.327
Zhao XiJuan,Fang JingMei,Li YuanFang,Huang ChengZhi
Selective recognition of adenosine 5′-triphosphate (ATP) is of great significance owing to its indispensable functions to organisms. Also, it is a challenging task because other nucleosides triphosphate hold the same triphosphate group and structurally planar bases as ATP. It is known that metal-organic frameworks (MOFs) are a new type of sensing material. In this work, highly selective recognition of ATP against other nucleosides triphosphate is successfully achieved with a luminescent MOF of [Zn(BDC)(H 2 O) 2 ]
n
(BDC 2− = 1,4-benzenedicarboxylate). [Zn(BDC)(H 2 O) 2 ]
n
dispersed in water shows a remarkable redshift of the emission wavelength upon addition of ATP, while cytidine 5′-triphosphate (CTP), uridine 5′-triphosphate (UTP), and guanosine 5′-triphosphate (GTP), as well as some inorganic anions such as P 2 O 7
4− or PO 4
3− can’t induce such spectral change as ATP. 1 H NMR, 31 P NMR and Raman spectra indicate that both π-π stacking interactions and the coordination of Zn(II) with adenine and the phosphate group are involved in the interaction of [Zn(BDC)(H 2 O) 2 ]
n
with ATP. In addition, the experimental results showed that the redshift extent of the emission wavelength of [Zn(BDC)(H 2 O) 2 ]
n
has the linear relationship with the concentration of ATP in the range of 0.3–1.8 mmol/L. Based on this, the detection of ATP content in the sample of ATP injection was made with satisfactory results. This system pioneers the application of MOFs in the recognition of nucleotides, and testifies that the participation of base in the recognition process can improve the selectivity against the other nucleotides.
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INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Mengyun Lu,Xinwen Jia,Wenjing Zhang,Wuduo Zhao,Ajuan Yu,Gangfeng Ouyang
The enantioselective performance of porous chiral metal–organic frameworks (CMOFs) is closely related to the pore size and uniformity of easily accessible active sites. The chiral recognition efficiency of microporous CMOFs is hindered by the restricted diffusion of the guest. Hierarchical porous chiral CMOFs with multiple pore size regimes ranging from micropores to macropores have emerged as potential candidates in chiral separation applications. 3DOM Zn-MOF-74 crystalline porous material with ordered macro–micropore structure was prepared with a general bottom-up strategy by carrying out the controllable confined growth of Zn-MOF-74 precursor in a removable three-dimensional ordered macroporous (3DOM) polystyrene (PS) template. Then l-tryptophan ( l -Trp) was introduced into MOFs by the strategy of postsynthetic modifications, and finally, a chiral hierarchical porous functional material 3DOM Zn-MOF-74-l-Trp was successfully fabricated. Based on the two luminescent centers from the achiral ligand H4DOBC and chiral ligand l-Trp, the proportional fluorescence sensor 3DOM Zn-MOF-74-l-Trp was hopeful to be applied in the field of enantioselective fluorescence sensing. The enantioselectivity factor values of microporous M-Zn-MOF-74-l-Trp for 1,1′-bi-2-naphthol (Binol) and mandelic acid (MA) were 1.08 and 1.12, respectively. In comparison, the construction of hierarchical porous structure greatly enhanced the chiral recognition performance, which may be due to the improved mass-transfer efficiency of chiral guest molecules and highly swelled accessibility to the chiral recognition sites in this CMOF composite, making the enantioselectivity factor values correspondingly increased to 1.29 and 2.26, respectively.
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JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 37
·17531-17544
·
IF 3.5
Zhao Shifeng,Ou Yanwen,Zhao Yanping,Liu Yuqin,Lv Fengzhu
Ferroan brucite with different Fe 2+ doping amounts (Mg 1-X Fe X (OH) 2 , x = 0.3, 0.4, 0.5, 0.6, 0.7 and 0.8) was synthesized for the removal of Congo red (CR) from wastewater. As the Fe 2+ content increased, the removal efficiency initially increased and then decreased, and Mg 0.6 Fe 0.4 (OH) 2 exhibited the maximum removal amount which was 2745.96 mg/g. The high removal ability of Mg 0.6 Fe 0.4 (OH) 2 was derived from the combined removal mechanism. The removal amount of CR was highly related to the amount of Fe 2+ in MgFe(OH) 2 and its existed state. The removal behaviors of M 0.7 Fe 0.3 (OH) 2 (M = Zn, Ni, Co) were also conducted to verify the function and university of Fe 2+ in the degradation process. The influence of M 2+ in M 0.7 Fe 0.3 (OH) 2 (M = Zn, Ni, Co) on the removal efficiency was explored by experimental study and calculation of the system energy and bond length change based on molecular simulation. This work provided an outstanding approach for preparation of high efficiency materials to purify organic wastewater. Graphical Abstract
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ADVANCED FUNCTIONAL MATERIALS
·
2020
·Vol. 31
·期 3
·2005092
·
IF 16.836
Yang Yang,Jinfei Xiao,Jinyan Cai,Gongming Wang,Wencheng Du,Yufei Zhang,Xihong Lu,Cheng Chao Li
Environment-friendly and low-cost aqueous zinc-ion batteries (ZIBs) have received considerable attention for large-scale energy storage. However, the low coulombic efficiency and potential safety hazards of Zn-metal anodes severely hinder their practical implementations. Herein, for the first time, mixed-valence Cu 2− x Se is proposed as a new intercalation anode to construct Zn-metal-free rocking-chair ZIBs with a long lifespan. It is found that the introduction of low-valence Cu not only modify active sites for Zn 2+ ion storage, but also optimizes the electronic interaction between the active sites and the intercalated Zn 2+ ion, leading to a favorable intercalation formation energy (−0.68 eV) and reduced diffusion barrier, as demonstrated by first-principles calculation. Ex situ X-ray diffraction, ex situ transmission electron microscopy and galvanostatic intermittent titration technique measurements reveal the reversible insertion/extraction of Zn 2+ in Cu 2− x Se via an intercalation reaction mechanism. Owing to the rigid host structure and facile Zn 2+ diffusion kinetics, the Cu 2− x Se nanorod anode shows an enhanced coulombic efficiency (above 99.5%), outstanding rate capability and excellent cycling stability. The as-fabricated Zn x MnO 2 ||Cu 2− x Se Zn-ion full battery exhibits an impressive electrochemical performance, particularly an ultralong cycle life of over 20 000 cycles at 2 A g −1 . This study is expected to provide new opportunities for developing high-performance rechargeable aqueous ZIBs.
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