APPLIED CATALYSIS A-GENERAL
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2022
·
IF 5.723
Yitao Zhao,Junjun Cheng,Peng Zhang,Xinhui Liu,Jianguo Zhuang,Yijun Yu,Qichao Zhao,Yuchen Wang,Xuedong Zhu,Fan Yang
Alkylation of benzene with carbon dioxide (CO 2 ) is significant for converting greenhouse gas and surplus benzene into value-added toluene and xylene. Herein, a bifunctional catalyst comprising Zn/Ga oxides and HZSM-5 zeolite was developed to efficiently promote the methylation of benzene with CO 2 and H 2 . This catalytic system exhibited excellent performance at 425 ℃ and 3.0 MPa, through which benzene conversion of 39.1% and total xylene/toluene selectivity of 92.7% have been achieved. Furthermore, the catalysts are carefully characterized; compositions of Zn/Ga oxides and Si/Al ratios of HZSM-5 zeolite are recognized as decisive factors for reaction activity and selectivity respectively. Additionally, primary reaction pathways are explored and testified to provide detailed understanding for the establishment of reaction networks, especially for mechanisms of ethylbenzene evolution. These findings are able to provide more deep insights into the process of benzene alkylation, which further facilitates the emergence of effective catalysts with potential industrial applications.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2015
·
IF 2.133
Fei Yin,Jing Chen,Yongfeng Liang,Yang Zou,Jiang Yinzhi,Jingli Xie
Two coordination polymers [Co(dnbab) 2 (bimb)](H 2 O) 4 ( 1 ) and [Zn(dnbab) 2 (bimb)](H 2 O) 5 ( 2 ) (Hdnbab=4-[(3,5-dinitrobenzoyl)amino]benzoic acid, bimb=1,4- bis (1-imidazolyl) benzene) have been solvothermally synthesized. Their structures have been determined by single-crystal X-ray diffraction analyses and further characterized by powder X-ray diffraction (PXRD) and thermogravimetric (TG) analyses. Complexes 1 and 2 are isostructures and each displays an one-dimensional (1D) zigzag chain, which further forms a 3D supramolecular architecture with 1-D channels via inter-chain π–π interactions and hydrogen bonds . Moreover, the magnetic properties of 1 and fluorescent properties of 2 have been investigated.
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Science China-Materials
·
2022
·Vol. 66
·期 2
·556-566
·
IF 8.64
Gong Zongshuai,Song Chunlai,Bai Chong,Zhao Xiaomeng,Luo Zhiqiang,Qi Gaocan,Liu Xizheng,Wang Cheng,Duan Yueqin,Yuan Zhihao
Aqueous Zn-I 2 batteries (AZIBs) are highly desirable for green energy-storage technologies, but their development was greatly limited by their unsatisfactory energy densities. Herein, we report high-energy-density rechargeable AZIBs achieved by anchoring high-mass iodine to a distinctive N-doped hierarchical porous carbon (NHPC) material with large micropore volume and rich N-doping. The NHPC combined strong iodine confinement caused by the micropore and powerful chemisorption of iodine species with pyridine-N doping, which enabled high loads of iodine up to 61.6 wt%. Notably, density functional theory calculations and experimental studies showed that abundant pyridine-N active sites promoted electron transfer, and the interconnected micro-mesoporous structure facilitated the Zn-ion diffusion to synergistically promote the redox kinetics of AZIBs. The high content of iodine-loading cathode exhibited a high capacity of 219.3 mA h g −1 at 1.0 C, indicating excellent rate capability and superior cycling stability with a low capacity decay of 0.00147% per cycle within 10,000 cycles at 5.0 C. In addition, a preliminary device assembled with three batteries in series provided a high energy density of up to 72.6 W h kg −1 calculated by the total mass of the battery, which is almost two times that of the commercial aqueous lead-acid and Ni-Cd batteries. The high energy density and long cycle life of this aqueous battery indicate its great application potential in large-scale energy storage.
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Polymers
·
2020
·Vol. 12
·期 3
·584
·
IF 3.426
Zixin Yu,Jie Wang,Peihua Li,Dachuan Ding,Xuan Zheng,Chuanqun Hu,Zhinan Gao,Tao Hu,Xinghou Gong,Chonggang Wu
A half-critical weight-average molecular weight (M¯w) (approximately 21,000 g mol−1), high-ion-content Zn-salt poly(styrene–ran–cinnamic-acid) (SCA–Zn) ionomer was successfully synthesized by styrene–cinnamic-acid (10.8 mol %) copolymerization followed by excess-ZnO melt neutralization. At 220 °C, the SCA–Zn’s viscosity was only approximately 1.5 magnitude orders higher than that of commercial polystyrene (PS) at 102s−1, and the PS/SCA–Zn (5–40 wt %) melt blends showed apparently fine, two-phased morphologies with blurred interfaces, of which the 95/5 and 90/10 demonstrated Han plots suggesting their near miscibility. These indicate that any PS–(SCA–Zn) processability mismatch was minimized by the SCA–Zn’s half-criticalM¯wdespite its dense ionic cross-links. Meanwhile, the SCA–Zn’s Vicat softening temperature (VST) was maximized by its cross-linking toward 153.1 °C, from that (97.7 °C) of PS, based on its half-criticalM¯wat which the ultimate glass-transition temperature was approximated. Below approximately 110 °C, the PS/SCA–Zn (0–20 wt %) were seemingly miscible when theirVSTincreased linearly yet slightly with the SCA–Zn fraction due to the dissolution of the SCA–Zn’s cross-links. Nevertheless, the 60/40 blend’sVSTsignificantly diverged positively from the linearity until 111.1 °C, revealing its phase-separated morphology that effectively enhanced the heat resistance by the highly cross-linked SCA–Zn. This work proposes a methodology of improving PS heat resistance by melt blending with its half-criticalM¯w, high-ion-content ionomer.Keywords:polystyrene;heat resistance;blending modification;poly(styrene–ran–cinnamic acid);ionomer
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Sustainable Materials and Technologies
·
2025
·
IF 9.2
Weinan Dong,Xuehong Qiu,Weisong Zhao,Bao Guo,Kaixi Jiang
In zinc hydrometallurgical plant, neutralizing precipitation and the subsequent dissolution are implemented to enrich scattering metals, Gallium (Ga) and Indium (In), and Cu from zinc leaching solution, facilitating further extraction and separation of Ga/In and others. The formation of jarosite presents both challenges and opportunities for Ga/In extraction, as Ga/In can substitute Fe within the jarosite structure. In this work, the evolution of the Ga/In occurrence state, especially its relationship with jarosite was investigated and the role of Fe/K/Pb was emphasized. Results show that jarosite formation is inevitable at pH 1–2, with K-jarosite forming kinetically faster than Pb-jarosite. By supplying sufficient K, precipitation rates reached 95.7 % for Ga and 98.1 % for In at pH 2 with little Cu/Ge loss. Eventually, a more appropriate and efficient flowsheet for recovery of scattering metals and Cu from zinc leaching solution is recommended, providing a practical framework comprehensive utilization in zinc hydrometallurgy.
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Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 46
·12566-12574
·
IF 5.976
Xiaohui Li,Lei Zhou,Miroslav D. Dramićanin,Qiang Tang,Xiping Jing,Jianxin Shi,Yiqin Xu,Mingmei Wu
Broad emission with a full and continuous color spectrum realized by crystal engineering is extensively desired to simulate natural sunlight and improve the white color quality. Herein, new insight into the modulation of B site order–disorder and intrinsic oxygen defects for complex perovskite (A3B′B2′′O9) Sr3−xScxZnNb2O9 (0 ≤ x ≤ 0.1) phosphors is demonstrated for broad-band emission via crystal engineering. We elucidate that the spectrum of Sr3ZnNb2O9 synthesized at an optimal temperature exhibits two emission bands under near-ultraviolet excitation (λex = 374 nm) which is readily available from near ultraviolet chips. The two broad emission bands can be ascribed to charge transfer from the empty 4d (t2g)-orbitals of Nb5+ ions to the filled 2p-orbitals of O2− ions and the intrinsic oxygen defects. Further, as a proposed strategy to optimize the luminescence property of Sr3ZnNb2O9 (SZN), we realized A-site nonequivalent doping to induce B-site disordering and cancel the luminescence quenching which results from B site ordering. The A-site nonequivalent doping efficiently offsets intrinsic oxygen defects, as validated by systematic analyses of experiments and DFT calculations. Consequently, the novel phosphor Sr3−xScxZnNb2O9 (x = 0.1) shows a high color rendering index (Ra = 82.2) and negligible color shift. In addition, its emission intensity is enhanced by ∼70 times as compared to the pristine Sr3ZnNb2O9.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2026
·
IF 4.8
Ziyue Zhou,Dmitry Kirsanov,Mikhail Voznesenskiy,Decheng An,Wang Wang,Jiaye Huang,Qun Wang
The development of highly selective and sensitive fluorescence-based nanoprobes for monitoring Fe 3+ concentration is important in environmental analyses. Herein, unique metal complex precursors involving triethanolamine (TEA) and zinc acetate Zn(OAc)₂ were designed to synthesize carbon quantum dots (CDs) via hydrothermal carbonization approach. The prepared water-soluble Zn N codoped CDs are ∼2.9 nm in size and exhibit excitation-dependent blue emission and good photostability. Zn 2+ ions, coordinated via Zn-TEA complexes, are incorporated into the carbon matrix and function as anchors to bridge and stabilize sp 2 domains. The CDs serve as an ideal platform for sensitive detection of Fe 3+ in aqueous media through fluorescence quenching, with a detection limit of 3.48 μM, which is below the water quality standard for Fe 3+ (0.3 ppm, ∼5.36 μM) in drinking water suggested by the U.S. Environmental Protection Agency (EPA). Interference studies reveal that the presence of 17 other competing ions does not alter the sensing of Fe 3+ , indicating the high selectivity of the CDs toward Fe 3+ , while the fluorescence quenching mechanism is attributed to the formation of non-fluorescent complexes between Fe 3+ and surface functional groups of the CDs, leading to nonradiative recombination. Simultaneously, Zn high concentration favors the preparation of ZnO microsphere pigment composed of nanocrystals through TEA ligand modified bridge effect.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2026
·
IF 5.4
Bin Yao,Huiyun Luo,Mengdie Qu,Xingyan Liu,Lirong Mo,Panyin Wang,Li Wen,Youzhou He,Yuyu Fang,Min Fu,Bowen Lei
Preparation of upconversion efficient In-TCPP(Zn) via an " internally-empowered " Strategy • Synergistic enhancement of light absorption and charge carrier migration via the upconversion effect and IEF • The IZT has highly efficient photocatalytic production capacity of H 2 . In recent years, most current studies on upconversion photocatalysts mainly focus on improving light harvesting, while their deeper role in regulating charge carrier dynamics remains insufficiently explored. Herein, high-photosensitivity Zn-porphyrin (ZnTCPP) was used as a ligand to synthesize In-TCPP(Zn) (IZT-X%, X represents the content of doped metal salts) doped with upconversion elements (Tm 3+ ). Among the series of synthesized materials, IZT-3% exhibited the most outstanding photocatalytic performance (1775 μmol·g −1 ·h −1 ), which is 8.07 times that of pristine In-TCPP(Zn). In-situ X-ray photoelectron spectroscopy ( in-situ XPS), time-resolved photoluminescence (TRPL), upconversion photoluminescence (UCPL) and DFT analyses reveal that the incorporation of Tm 3+ improves the charge distribution and enhances the built-in electric field (IEF) in In-TCPP(Zn), thereby accelerating charge carrier migration. Simultaneously, Tm 3+ can upconvert low-energy near-infrared (NIR) light to visible light that can be absorbed by In-TCPP(Zn), thereby significantly enhancing its photocatalytic performance. This study highlights the key role of upconversion doping in modulating charge carrier dynamics and provides new insights into the synergistic effect of upconversion and the IEF for improving photocatalytic hydrogen evolution efficiency, thereby broadening the utilization of near-infrared light. Download: Download high-res image (205KB) Download: Download full-size image
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2026
·
IF 9.6
Siqi Liu,Shanshan Cheng,Zhimeng Liu,Miaomiao Zheng,Hongyuan Wang,Supakorn Boonyuen,Hongyi Gao,Ge Wang
Reactive oxygen species (ROS)-mediated sterilization typically relies on continuous light irradiation or exogenous H 2 O 2 addition, limiting their practical utility under dark or resource-limited conditions. Herein, we rationally design an S-scheme MIL-100(Fe)/Zn 3 In 2 S 6 heterojunction (M 5 Z 1 –1@ZIS2) by in-situ growing Zn-doped MIL-100(Fe) on Zn 3 In 2 S 6 , achieving synergistic light-harvesting and ROS self-supply capabilities. The incorporation of Zn 3 In 2 S 6 enhances electron density around Fe 2+ sites while modulating Fe 3+ states, significantly improving O₂ activation and H 2 O 2 affinity. This unique electronic regulation enables the heterojunction to generate superoxide radical(·O₂ − )-dominated ROS even in the dark. Notably, visible-light pretreatment induces active In sites in Zn 3 In 2 S 6 to produce H 2 O 2 , which accumulates and sustains the FeII/FeIII redox cycle in the absence of light, driving continuous hydroxyl radical(·OH)-dominated ROS generation. Combined characterizations including X-ray photoelectron spectroscopy (XPS) and Electron Paramagnetic Resonance (EPR) confirm H₂O₂-mediated Fe 2+ regeneration and ROS persistence. The M 5 Z 1 –1@ZIS2 heterojunction exhibits exceptional antibacterial performance, achieving ≥99.9% inactivation of Escherichia coli ( E. coli ) within 1.5 h in the dark and 40 min under visible light. This work provides a strategy for designing self-sustaining catalytic systems that leverage light-driven H₂O₂ supply to enable day-night ROS functionality. Furthermore, M 5 Z 1 –1@ZIS2 loaded on polyvinylidene fluoride (PVDF) film can achieve an efficiency of over 99% for particulate matter (PM) pollutants at the wind speeds of 1.5 m/s and 0.5 m/s and reach a maximum adsorption efficiency of 99.5% for formaldehyde within 19 min, highlighting its potential for all-weather air purification via ROS-mediated environmental remediation.
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高影响因子
Journal of Energy Chemistry
·
2022
·
IF 13.599
Yifei Zhang,Quanfeng He,Zihao Chen,Yuqing Chi,Junwei Sun,Ding Yuan,Lixue Zhang
Developing advanced oxygen reduction reaction (ORR) electrocatalysts with rapid mass/electron transport as well as conducting relevant kinetics investigations is essential for energy technologies, but both still face ongoing challenges. Herein, a facile approach was reported for achieving the highly dispersed Co nanoparticles anchored hierarchically porous N-doped carbon fibers (Co@N-HPCFs), which were assembled by core-shell MOFs-derived hollow polyhedrons. Notably, the unique one-dimensional (1D) carbon fibers with hierarchical porosity can effectively improve the exposure of active sites and facilitate the electron transfer and mass transfer, resulting in the enhanced reaction kinetics. As a result, the ORR performance of the optimal Co@N-HPCF catalysts remarkably outperforms that of commercial Pt/C in alkaline solution, reaching a limited diffusion current density ( J ) of 5.85 mA cm −2 and a half-wave potential ( E 1/2 ) of 0.831 V. Particularly, the prepared Co@N-HPCF catalysts can be used as an excellent air-cathode for liquid/solid-state Zn-air batteries, exhibiting great potentiality in portable/wearable energy devices. Furthermore, the reaction kinetic during ORR process is deeply explored by finite element simulation, so as to intuitively grasp the kinetic control region, diffusion control region, and mixing control region of the ORR process, and accurately obtain the relevant kinetic parameters. This work offers an effective strategy and a reliable theoretical basis for the engineering of first-class ORR electrocatalysts with fast electronic/mass transport.
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Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Ge Zhang,Huifen Yang,Tong Zhao,Xuan Li,Yichen Zhou,Song Guo
The thermal adsorption residue (TDR) from oil sludge co-contaminated soil was employed to remove As(III), Zn(II), Cu(II), Cd(II) in aqueous solution. The results showed that the TDR could efficiently neutralize the acid and adapt to the extensive pH. The adsorption of four heavy metals on TDR could be divided into three stages. The maximum adsorption capacity were 86.59, 249.07, 339.88, 322.86 mg·g −1 for As(III), Zn(II), Cu(II), Cd(II), respectively. The coexistence of Zn(II)/Cu(II)/Cd(II) could promote As(III) removal but As(III) led to decreasing of Zn(II)/Cu(II)/Cd(II) adsorption capacity in binary system. There was a significant competitive adsorption on TDR among the three cations which followed the selectivity sequence of Cu(II)>Zn(II)>Cd(II). The SEM-EDS, XRD, FTIR and XPS analyses demonstrated that the As(III) was removed via formation of Ca-As precipitation, and the Zn(II), Cu(II), Cd(II) were removed through precipitating as hydroxides/carbonates/silicates combining with ion exchange. Specially, the Cu(II) mainly precipitated in the form of Cu 4 (SO 4 )(OH) 6 ⋅2H 2 O and Cu 4 (OH) 6 SO 4 under sulfuric acid solution environment. Overall, this study indicates the potential of TDR as a cost-effective adsorbent in acid heavy metals contaminated wastewater treatment .
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ENVIRONMENTAL MONITORING AND ASSESSMENT
·
2022
·Vol. 194
·期 5
·1-10
·
IF 3.307
Yang Nan,Ge Zhimeng,Li Aihong,Wei Baiyong,Li Yinming,Zhang Ye,Shen Qianjin,Wang Tuqiang,Wu Xueqian,Cao Xiangdong,Guo Jianping,Wang Zhaojia
The municipal solid waste incineration (MSWI) fly ash has been a major problem with the rapid development of the cities in China. And the cement rotary kiln co-processing technique is accepted as an effective method to dispose detrimental heavy metals in MSWI fly ash. This study focused on presented the total leaching content and the morphological distribution of the heavy metals in cement solid samples doped with MSWI fly ash. These samples were collected from a MSWI fly ash co-processing cement rotary kiln plant. The leaching test and the sequential extraction procedure were adopted to measure the migration characteristic of As, Pb, Cu, and Zn. In addition, the leachability of clinker samples under different simulated environmental conditions was also detected to analyze the security of the cement product doped with MSWI fly ash. This work demonstrates the feasibility of the cement rotary kiln MSWI fly ash co-processing technique and provides a scientific guidance to related plant.
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