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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高影响因子
FOOD CHEMISTRY
·
2023
·
IF 8.8
Jinwen Yang,Linlin Chen,Jie Qi,Feili Luo,Lin Li,Honghong Wu,Feifei Cao,Jiangjiang Gu
A novel fluorescence “off-on-off” probe was presented to detect Zn(II) and oxalic acid (OA) based on nitrogen-doped MXene quantum dots ( N -MQDs), which were synthesized by an ultrasound approach at room temperature with nitric acid and ethylenediamine. These N -MQDs displayed small size (<10 nm), water dispersibility, and good photoluminescence. Furthermore, the N -MQDs showed an selective response towards Zn(II) through fluorescence enhancement, with a limit of detection (LOD) calculated as 0.127 μM in the linear range of 0–20 μM. Then, the fluorescence of N -MQDs/Zn(II) system could be selectively quenched after adding OA, with an effective response in the range from 0 to 20 μM (LOD: 0.883 μM). The fluorescence “turn-on” and “turn-off” properties of N -MQDs were resulted from the intramolecular charge transfer (ICT) of Zn(II) and the coordination between OA and Zn(II), respectively. This sensing platform was successfully applied for Zn(II) and OA detection in actual environmental and vegetable samples.
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Catalysis Science & Technology
·
2021
·Vol. 12
·期 1
·181-191
·
IF 6.119
Xin Wang,Guang-Lan Li,Zhong-Fa Lu,Shuo Cao,Ce Hao,Suli Wang,Gongquan Sun
Reversible oxygen catalysts with good catalytic performance and economic efficiency are urgently needed for the rapid development of metal–air batteries and reversible fuel cells. Herein, a metal-free N, S co-doped porous carbon thin film (NSCF) was coated in situ on carboxylic carbon nanotubes (CNT@NSCF) via a simple and scalable low temperature polymerization–high temperature pyrolysis strategy. By analyzing the surface structure of comparable carbon supports including ketjenblack, Vulcan XC-72 carbon, and activated carbon, it is found that the surface oxygen-containing functional groups of the support are the key factor to obtaining a uniform coating of NSCF with the formation of a large amount of efficient N, S active species. As a result, the optimal CNT@NSCF shows an excellent bifunctional oxygen catalytic activity with a narrow potential difference (ΔE = Ej = 10,OER − E1/2,ORR) value of 0.74 V, which is superior to that of Pt/C + RuO2 (0.75 V) and most metal-free carbon-based oxygen catalysts. Notably, the CNT@NSCF-based rechargeable Zn–air battery delivers a remarkable performance with a high open-circuit voltage and outstanding charge–discharge stability after 213 h, which fully demonstrates the promising practical application potential of the CNT@NSCF catalyst.
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Nanoscale
·
2023
·Vol. 15
·期 45
·18395-18406
·
IF 6.7
Kun Wang,Liyuan Wang,Jinrui Huang,Ye Chen,Xupo Liu,Tianfang Yang,Gangya Wei,Shuyan Gao
The introduction of transition bimetallic alloys can effectively improve oxygen reduction reaction (ORR) activity. However, the alloy particles are inclined to dissolve under harsher conditions, resulting in a serious decrease in catalytic activity and stability. Herein, an efficient ORR catalyst, FeCo alloy nanoparticles (NPs) encapsulated in N,S co-doped carbon nanotubes (FeCo10-NSCNTs), was developed through a self-catalyzed growth strategy. Due to the delicate structural design, the N,S co-doped structure can effectively improve the ORR performance by modulating the electronic properties and surface polarity of the carbon substrate, and the randomly connected carbon nanotube structure with large specific surface area can further enhance the adsorption and dissociation of gas molecules, accelerating the kinetics of gas participation in the reaction. Carbon-encapsulated FeCo alloys are beneficial for improving catalytic activity and durability. The FeCo10-NSCNTs displayed excellent ORR activity with a half-wave potential of E1/2 = 0.84 V and robust stability of 13 k cycles. More impressively, the assembled liquid-state Zn–air battery (ZAB) with FeCo10-NSCNTs as the air-electrode delivers an output power density of 146.68 mW cm−2 along with excellent operation durability. The assembled all-solid ZAB has good cyclic stability under 0–180° bending conditions. The synthesized N,S co-doping, carbon nanotubes and FeCo alloys provide important guidance for the construction of cheap non-noble metal–carbon hybrid nanomaterials.
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Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 27
·8537-8544
·
IF 7.393
Zhongyuan Guan,Haihang Ye,Peiwen Lv,Lijin Wang,Jing Zhang,Bin Zou,Aiwei Tang
Multinary Cu-based chalcogenide nanocrystals (NCs) are excellent candidates for optoelectronic applications, but their growth mechanism and its impacts on the NCs’ optical properties remain controversial. Herein, we employed a simple colloidal chemistry method for the growth of multinary Cu-based NCs including ternary Cu–In–S NCs, quaternary Cu–In–Se–S NCs, and five-component Cu–In–Zn–Se–S NCs, to explore their growth mechanism and investigate their optical properties. It is found that the ternary Cu–In–S NCs contain a large number of copper vacancies, which affect the major acceptor level for the exciton recombination. With the high reaction activity of Se, the quaternary Cu–In–Se–S NCs form at low reaction temperature and have a red-shift of the photoluminescence (PL) maximum due to the recombination from the conduction band to the acceptor level. The formation process of five-component Cu–In–Zn–Se–S NCs highly depends on the Zn amount, which shows a competitive relationship between the NCs’ growth and diffusion of Zn, leading to the red- and blue-shift of PL maximum, respectively. Our study provides a clear map for the growth of multinary Cu-based NCs and shows their impacts on optical properties.
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Journal of Materials Chemistry B
·
2020
·Vol. 9
·期 9
·2200-2211
·
IF 5.344
Qing Sun,Mengting Duan,Wei Fan,Bing Fan
Enterococcus faecalis is the main cause of refractory root canal infections in human teeth. The control of root canal infection is one of the conditions necessary for the successful treatment of refractory root canal infections. In the present study, nano-scale silver–zinc–calcium–silica particles loaded with different ratios of silver–zinc were successfully prepared (Ag0.5Zn3-MCSNs and Ag0.5Zn10-MCSNs). The release profiles, antibacterial activity against E. faecalis, infiltration depth into dentinal tubules, biocompatibility and effects on dentin microhardness in vitro were investigated. In addition, the antimicrobial effects of the particles against Enterococcus faecalis reinfection were evaluated in vivo in the teeth of beagle dogs. Ag, Zn, Ca and Si were released from Ag–Zn-MCSNs, and the atomic ratio of silver and zinc released can reach the optimal value of 1 : 12 (Ag0.5Zn10-MCSNs). The particles also showed good biocompatibility and antibacterial activity against Enterococcus faecalis and did not reduce the hardness of dentin. The nanoparticles could be driven into the dentinal tubules of dentin slices by ultrasonic activation. In the root canals of beagle dogs, both Ag0.5Zn3-MCSNs and Ag0.5Zn10-MCSNs demonstrated strong preventive effects against E. faecalis infection. The Ag–Zn–Ca–Si mesoporous nanoparticles may develop into a new effective root canal disinfectant or root canal sealer.
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CRYSTAL GROWTH & DESIGN
·
2020
·
IF 4.089
Jin-Xia Yang,Xin Zhang,Ye-Yan Qin,Yuan-Gen Yao
A 2D network of {[Zn(Hbcpt)(H2O)3]·7H2O} (1) was hydrothermally synthesized and structurally characterized. By employing different N-donor ligands into the system of 3,5-bis(4′-carboxyl-phenyl)-1,2,4-triazole (H3bcpt) and Zn(II) cations, six novel entangled coordination polymers, namely, {[Zn2(bcpt)(μ2-OH)(H2O)]·(py)·4H2O} (2), {[Zn2(Hbcpt)2(bpa)2]·2H2O} (3), {[Zn(Hbcpt)(bpp)]·[Zn(Hbcpt)(bpp)]·2.5H2O} (4), {[Zn5(bcpt)2(biimpy)2(μ2-OH)4]·5H2O} (5), {[Zn2(bcpt)(bib)(μ2-OH)]·H2O} (6), and {[Zn2(bcpt)(bix)4(μ2-OH)]·3H2O} (7) (H3bcpt = 3,5-bis(4′-carboxyl-phenyl)-1,2,4-triazole, bpa = 1,2-bis(4-pyridyl)ethane, bpp = 1,3-bi(4-pyridyl)propane, biimpy = 2,6-bis(imidazole-1-yl)pyridine, bib = 1,4-bis(N-imidazolyl)butane, bix = 1,4-bis(imidazol-1-ylmethyl)-benzene, py = pyridine), were obtained. Single-crystal X-ray diffraction analysis reveals that, with the different N-donor ligands, the resulting compounds present entangled structures with different topologies. Compound 1 shows a 2D (4, 4) network, and the adjacent sheets are extended into a 3D supramolecular framework via hydrogen-bonding interactions. Interesting, by introducing a series of ditopic N-donor ligands into the reaction system, compounds 2–7 with entangled structures were harvested. Compound 2 exhibits a 3D self-penetrating network with an 8-connected bcu topology. Compound 3 features an 8-fold dia network showing an unusual [4 + 4] mode of interpenetration. Compound 4 is comprised of two parts of undulated 2D 44-sql networks, and the adjacent undulated layers are parallel interpenetrated to each other to give a 2D → 3D polycatenated framework. Compound 5 presents an unusual 3D self-penetrating network with a novel 4,6,6-connected trinodal network with the point symbol of (32·4·52·6)(32·4·56·66}{32·56·66·7}. Compound 6 shows a 2-fold interpenetrating 3D architecture with 6-connected sxd topology. Compound 7 displays an unprecedented self-penetration derived from abnormal [3 + 2] 5-fold interpenetrating dia subnets. Structural diversity of these compounds suggests that different N-donor ligands can induce the organic ligand to present different conformations and coordination modes, and the influence on the final structures. Furthermore, the luminescent properties of compounds 1–7 have been investigated in the solid state.
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Nanoscale
·
2020
·Vol. 12
·期 10
·6111-6120
·
IF 6.895
Dongxu Zhu,Haihang Ye,Zheming Liu,Jun Liu,Hao Fu,Yanbin Huang,Feng Teng,Zhijie Wang,Aiwei Tang
Multinary copper-based chalcogenide nanocrystals (NCs) as light-driven photocatalysts have attracted extensive research interest due to their great potential for generating sustainable energy without causing environmental concerns. However, systematic studies on the growth mechanism and related photocatalytic activities involving different valent metal ions (either M2+ or N3+) as foreign cations and monoclinic Cu1.94S NCs as the ‘parent lattice’ have rarely been carried out. In this work, we report an effective seed-mediated method for the synthesis of heterostructured Cu1.94S–MS NCs (M = Zn, Cd and Mn) and alloyed CuNS2 NCs (N = In and Ga). A typical cation exchange process took place prior to the growth of heterostructured NCs, while further inter-cation diffusion occurred only for the alloyed NCs. When compared with Cu1.94S NCs, all the heterostructured Cu1.94S–MS NCs and CuGaS2 NCs showed enhanced photocatalytic activities toward hydrogen production by water splitting, owing to their tailored optical band gaps and energy level alignments. Although optically favored, CuInS2 ANCs were not comparable to others due to their low conduction band minimum for the reduction of H2O to H2.
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Advanced Energy Materials
·
2020
·Vol. 10
·期 25
·2000892
·
IF 25.245
Yongchao Tang,Xuejin Li,Haiming Lv,Dong Xie,Wenlong Wang,Chunyi Zhi,Hongfei Li
In aqueous alkaline Zn batteries (AZBs), the Co 3+ /Co 4+ redox pair offers a higher voltage plateau than its Co 2+ /Co 3+ counterpart. However, related studies are scarce, due to two challenges: the Co 3+ /Co 4+ redox pair is more difficult to activate than Co 2+ /Co 3+ ; once activated, the Co 3+ /Co 4+ redox pair is unstable, owing to the rapid reduction of surplus Co 3+ to Co 2+ . Herein, CoSe 2− x is employed as a cathode material in AZBs. Electrochemical analysis recognizes the principal contributions of the Co 3+ /Co 4+ redox pair to the capacity and voltage plateau. Mechanistic studies reveal that CoSe 2− x initially undergoes a phase transformation to derived Co x O y Se z , which has not been observed in other Zn//cobalt oxide batteries. The Se doping effect is conducive to sustaining abundant and stable Co 3+ species in Co x O y Se z . As a result, the battery achieves a 10 000-cycle ultralong lifespan with 0.02% cycle −1 capacity decay, a 1.9-V voltage plateau, and an immense areal specific capacity compared to its low-valence oxide counterparts. When used in a quasi-solid-state electrolyte, as-assembled AZB delivers 4200 cycles and excellent tailorability, a promising result for wearable applications. The presented effective strategy for obtaining long-cyclability cathodes via a phase transformation-induced heteroatom doping effect may promote high-valence metal species mediation toward highly stable electrodes.
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Advanced Fiber Materials
·
2024
·Vol. 6
·期 4
·1108-1121
·
IF 17.2
Lu Tuo,Xu Nengneng,Guo Liyuan,Zhou Benji,Dai Lingyu,Yang Woochul,Liu Guicheng,Lee Joong Kee,Qiao Jinli
Rechargeable Zn–air batteries (ZABs) have received extensive attention, while their real applications are highly restricted by the slow kinetics of the oxygen reduction and oxygen evolution reactions (ORR/OER). Herein, we report a “bridge” structured flexible self-supporting bifunctional oxygen electrode (CNT@Co-CNF F50-900 ) with strong active and stable Co-N/C@pyridine N/C@CNTs reaction centers. Benefiting from the electron distribution optimization and the advantages of hierarchical catalytic design, the CNT@Co-CNF F50-900 electrode had superior ORR/OER activity with a small potential gap (ΔE) of 0.74 V. Reinforced by highly graphitized carbon and the “π–π” bond, the free-standing CNT@Co-CNF F50-900 electrode exhibited outstanding catalytic stability with only 36 mV attenuation. Impressively, the CNT@Co-CNF F50-900 -based liquid ZAB showed a high power density of 371 mW cm −2 , a high energy density of 894 Wh kg −1 , and a long cycling life of over 130 h. The assembled quasi-solid-state ZAB also demonstrated a high power density, attaining 81 mW cm −2 , with excellent charge–discharge durability beyond 100 h and extremely high flexibility under the multi-angle application. This study provides an effective electrospinning solution for integrating high-efficiency electrocatalysts and electrodes for energy storage and conversion devices. Graphical Abstract
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高影响因子
POLYHEDRON
·
2024
·
IF 2.4
Gao-Sheng Zhu,Yu-Meng Wei,Dan Wang,Xuan-Zu Guo,Long Li,Yan-Ying Zheng,Yi Jia,Bao-Yi Yu,Qiao-Xia Shang
Four new Zn(II)-, Cd(II)-, Mn(II)-, and Co(II) - based 1D to 2D coordination polymers (CPs) were synthesized from metal salts and 1,4-di(1-imidazol-1-yl)naphthalene (DIN) ligand via the coordination reaction under hydrothermal conditions with quantitative yields , namely, [Zn(SO 4 )(DIN)(H 2 O)] ( CP-1 ), [Cd(NO 3 ) 2 (DIN)] ( CP-2 ), [Mn(SO 4 )(DIN)(H 2 O) 3 ] ( CP-3 ), and [Co(NO 3 ) 2 (DIN) 2 (H 2 O) 4 ] ( CP-4 ). The CPs were analyzed and characterized using FT-IR, Elemental Analysis , TGA , SC-XRD, and PXRD . CP-1 was selected as a model sensor for fluorescence detection , and the sensor exhibited high quenching rates at two excitation wavelengths of λ ex = 230 and 290 nm, and at a single emission wavelength of λ em = 350 nm. At these two different excitation wavelengths, CP-1 behaved differently during the sensing of pesticides, and the highest quenching rate was achieved by the sensor for nitenpyram ( λ ex = 230 nm) and imidacloprid ( λ ex = 290 nm). Furthermore, during the sensing of vitamins, CP-1 encountered a strong quenching effect toward vitamin B2 . During the sensing processes, the inner filter effect (for nitenpyram , imidacloprid , and vitamin B2), fluorescence resonance energy transfer (for nitenpyram, imidacloprid, and vitamin B2), and photo-induced electron transfer (for vitamin B2) were the mechanisms responsible for fluorescence quenching .
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高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Xuewei Luo,Shuo Huang,Ruiqi Huang,Jianhe Hong,Shuoguo Yuan,Zhu Shu,Ling Zhao,Cheng Lu,Hongyun Jin
By applying the high-entropy strategy, one can develop stable mixed oxide by populating a single sublattice with many distinct cations. Two kinds of rare-earth high-entropy hexaaluminates (La 1/5 Nd 1/5 Sm 1/5 Eu 1/5 Gd 1/5 )MAl 11 O 19 (M = Mg and Zn) were successfully synthesized, and their mechanical and thermal properties were analyzed. We highlight that the Zn-containing sample displays a significant increase in fracture toughness (2.48 MPa m 1/2 ) and a decrease in thermal conductivity (1500 °C, 1.2 W m −1 K −1 ) as compared to the Mg-containing sample. The diffusion of fine grains in platelet-like grains observed only in the Zn-containing sample is considered to be responsible for its outstanding mechanical properties. This work demonstrates the excellent thermal-mechanical properties of the Zn-containing sample and indicates the promising use of high-entropy hexaaluminate in the aerospace field acting as thermal barrier coating materials.
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危险品化学品经营许可证（带存储）