DESALINATION
·
2025
·
IF 9.8
Ya'’nan Zhao,Liyang Zhao,Yi'’na Yang,Tianran Zhao,Chunna Yu,Chang Zhao,Guangjian Xing
Freshwater scarcity and energy shortages stand as two of the most pressing global challenges confronting modern society. The integration of solar-driven interfacial evaporation with the hydrovoltaic effect emerges as a highly promising strategy to address both issues simultaneously. In this study, we report the development of Janus Nb 2 CT X /graphene aerogels (NGAs) specifically engineered to synergistically facilitate solar-driven seawater evaporation and hydrovoltaic power generation. The Janus NGAs were fabricated via a combination of hydrothermal reaction, freeze-drying, and surface modification techniques, yielding a three-dimensional porous architecture with distinct hydrophilic-hydrophobic asymmetry—a key structural feature for their dual-functional performance. Under 1 sun irradiation, the optimized NGA-3 sample achieved a high seawater evaporation rate of 1.64 kg·m −2 h −1 and an exceptional photothermal conversion efficiency of 86.61 %, attributed to the reduced water evaporation enthalpy (1904 kJ·kg −1 ) induced by the formation of intermediate water within the aerogel's porous structure. Meanwhile, the Nb 2 CT X MXene component enhances broadband sunlight absorption through the localized surface plasmon resonance (LSPR) effect, further boosting photothermal conversion. Concurrently, the NGAs exhibit robust hydrovoltaic performance: in NaCl solution, NGA-3 generated a stable output voltage of 147 mV under 1 sun and 236 mV under 3 sun. A peak power density of 197 μW·cm −2 was achieved in 10 wt% NaCl solution, demonstrating its adaptability to high-salinity environments. Additionally, the NGAs maintain excellent salt resistance and long-term operational stability. The synergistic integration of efficient photothermal conversion and electricity harvesting in the Janus NGAs offers a viable solution to alleviate global freshwater and energy pressures.
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DOI
高影响因子
Molecular Catalysis
·
2019
·
IF 2.938
Ao Hu,Xinhuan Lu,Dongming Cai,Haijun Pan,Run Jing,Qinghua Xia,Dan Zhou,Yongde Xia
N-doped porous carbons incorporating highly-dispersed non-noble metallic cobalt (Co) nanoparticle materials were synthesized by rapid pyrolysis of a zeolitic-type metal-organic framework (ZIF-9) and their structures, morphologies, topologies and relevant physical and chemical properties were fully measured by different characterization technologies. The resulting derived Co/CN materials were further evaluated as catalysts in nitrobenzene hydrogenation. It was found that Co/CN materials showed remarkbly catalytic activity and chemoselectivity for mild hydrogenation of nitrobenzene. Amongst the studied a series of Co/CN-x (pyrolyzed at x °C) materials, sample Co@CN-800 shows the most superior catalytic activity for hydrogenation of nitrobenzene. In particular, the catalytic conversion activity of Co@CN-800 is 100% with aniline being the sole product at 70 °C for 2 h, 27.5 times higher than that of cobalt powder (Co). It is believed that the large pore size, adsorption of nitroarenes substrate with high selectivity and strong interaction of Co nanoparticles with the doped N species can result in the high activity of Co@CN-800. This work therefore offers a cost-effective approach in developing highly efficient catalytic materials towards mild hydrogenation of nitrobenzene.
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DOI
高影响因子
IONICS
·
2024
·Vol. 30
·期 3
·1723-1733
·
IF 2.4
Zhao Ji-wei,Wei Zhi-qiang,Wang Can,Zhou Mei-pan,Lu Cheng-gong
The Co-based organic skeleton was combined with graphene oxide (GO) as a precursor, Ni 2+ hydrolysis etching was introduced, and finally, NiCo-LDH/GO was obtained. The final composite electrode material NiCo 2 S 4 /rGO was obtained by high-temperature vulcanization. The introduction of MOFs and rGO significantly increased the specific surface area of the material and made it have excellent electrochemical properties. The specific capacitance of the composite NiCo 2 S 4 /20rGO reaches an astonishing 272.5 mAh g −1 when the current density is 1 A g −1 . In addition, at a large current of 10 A g −1 , the specific capacitance of the material can also reach 139.5 mAh g −1 , and after a long cycle of 5000 cycles at such a current density, the capacity remains at the original 73.2%. With NiCo 2 S 4 /20rGO electrode material as the positive electrode and activated carbon as the negative electrode, the hybrid supercapacitor is assembled. At an energy density of 56.9 Wh kg −1 , its power density reaches an excellent 799 W kg −1 , and it still has a capacity retention rate of 74% at a current density of 10 A g −1 . The excellent properties of composites demonstrated in this work open up new possibilities for high-quality energy storage devices.
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
·
IF 9.446
Xiaoqin Sun,Xiaoxiang Xu
Layered semiconductor compounds often exhibit intriguing properties for photocatalytic water splitting, probably correlated with their peculiar crystal structures that facilitate charge separations. In this work, we perform an investigation on the layered Ruddlesden-Popper compound Sr 2 TiO 4 and its La/Rh co-doped counterparts for photocatalytic hydrogen production from water. Their crystal structures, optical absorption and other physicochemical properties have been systematically explored. Our results suggest that La/Rh can be successfully incorporated into Sr 2 TiO 4 with layered crystal structure maintained. The use of polymerized-complex method for sample synthesis significantly reduces the calcination temperature as low as 900 °C. La/Rh serves as efficient dopants for extending the light absorbance of Sr 2 TiO 4 as far as 550 nm. Photocatalytic hydrogen productions are also considerably improved after La/Rh co-doping under both full range (λ ≥ 250 nm) and visible light irradiation (λ ≥ 420 nm). An optimal doping level is reached at 3% (Sr 1.97 La 0.03 Ti 0.97 Rh 0.03 O 4 ) which gives the highest average hydrogen production rate ∼100 μmol/h and ∼40 μmol/h under full range (λ ≥ 250 nm) and visible light irradiation (λ ≥ 420 nm), corresponding to apparent quantum efficiency ∼1.27% and ∼1.18%, respectively. Photoelectrochemical analysis reveals that charge separation and electron lifetime strongly depends on the level of La/Rh co-doping. Mott-Schottky analysis and theoretical calculations indicate that the improved light absorption of La/Rh co-doped Sr 2 TiO 4 stems from the formation of new valence band with Rh 4d character which uplifts the valence band edge of Sr 2 TiO 4 .
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DOI
高影响因子
MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 3
·1-8
·
IF 5.3
Yang Shuning,Tian Li,Song Guanying,Li Huiling,Li Chao,Wu Qian,Shan Xiangyu,Zhao Lun
An electrochemiluminescence (ECL) sensor for determining bisphenol A (BPA) was prepared based on titanium dioxide (TiO 2 ) and Co-MOF. TiO 2 is a co-reaction promoter that amplifies the ECL signal in the Ru(bpy) 3 2+ -trinpropylamine (TPrA) system. When the electrode is modified with Co-MOF the ECL signal is significantly enhanced. This is because Co-MOF can not only be used as a co-reaction accelerator but also as a carrier to adsorb more luminescent substances. Possible mechanisms for amplifying the original signal through the synergistic action of the two substances are investigated. The ECL strength decreases with increasing concentrations of BPA, and the amount of BPA can be determined by the change in ECL signal strength (Δ I ). Under optimal experimental conditions, the linear range of BPA was 2.0 × 10 −10 to 2.0 × 10 −5 M, with a determination limit of 6.7 × 10 −11 M (3 σ / m ). The relative standard deviation (RSD) of the signal for ten consecutive measurements was 1.5%. The sensor can be used to detect BPA in bottled samples with recoveries of 96 to 105%. Graphical
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DOI
高影响因子
TOPICS IN CATALYSIS
·
2022
·Vol. 66
·期 1
·12-21
·
IF 2.781
Zhong Cheng,Shang Zhichao,Zhao Caixian,Luo He’an,Cao Yi,Yan Dejian,You Kuiyi
In order to obtain a high photoelectrochemical performance, co-catalysts loading is the most commonly used way, which can facilitate reactions and suppress the charge recombination. In this paper, a novel composite of ZnO/Ti 3 C 2 T X photoanode was fabricated by a facile spin coating of precipitating Ti 3 C 2 T X (MXene) flakes onto the surface of ZnO, as co-catalyst for enhanced photoelectrochemical (PEC) water splitting. Under simulated sunlight, the optimum composite of ZnO/Ti 3 C 2 T X photoanode showed the photocurrent density as 1.2 mA cm −2 at 1.23 V RHE , which is 1.4 times higher than that of pristine ZnO without Ti 3 C 2 T X co-catalyst (0.83 mA cm −2 at 1.23 V RHE ). The ZnO/Ti 3 C 2 T X photoanode showed a photoconversion efficiency of 0.32% and maintained a stable photocurrent over 2000s. The Ti 3 C 2 T X (MXene) flakes as co-catalyst to promote the charge transfer and accelerates the reaction kinetics in ZnO/Ti 3 C 2 T X photoanode. This work delivers a two-dimensional (2D) material Ti 3 C 2 T X (MXene) as co-catalyst for enhanced ZnO photoanode PEC water splitting.
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DOI
高影响因子
CATALYSIS LETTERS
·
2024
·Vol. 154
·期 7
·3787-3797
·
IF 2.3
Han Zhaohao,Chu Qingyan,Wang Hao,Jia Xiaoqiong,Jiang Peng,Li Tong
We successfully synthesized a bifunctional alkaline catalyst (Co@CTS-1), on the one hand, which demonstrates exceptional catalytic performance in the aerobic oxidation of alkenes, particularly in the epoxidation of styrene, in the absence of both an initiator and a co-reducing agent, achieving a conversion rate of 74.94%, a selectivity of 71.84% for styrene oxide; on the other hand, the catalyst maintained its high activity throughout a cyclic reaction run lasting up to 2500 min, demonstrating exceptional stability in the epoxidation of styrene. The Co@CTS-1 catalyst utilizes TS-1 as the carrier, and it is modified with cobalt and cerium elements. Through the embedding of cobalt elements within the TS-1 cage, the catalyst gains the ability to activate O 2 , and by inserting cerium elements into the atomic positions of silicon, the conversion rate is further enhanced. This encapsulated structure stabilizes cobalt nanoparticles, overcoming the short lifespan issues caused by sintering and leaching in conventional supported catalysts. This work provides practical clues for the development and application of novel catalysts, and will inspire the advancement of olefin air epoxidation. Graphical
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DOI
高影响因子
Advanced Materials Interfaces
·
2019
·Vol. 7
·期 2
·1901703
·
IF 4.713
Weicai Zhang,Jing Peng,Mingtao Zheng,Hanwu Dong,Hang Hu,Yong Xiao,Yingliang Liu,Yeru Liang
Assembling of well-orientated mesopores and 0D substance into an orchestrate architecture for constructing advanced carbon-based composites is highly attractive. Currently, this nanofabrication method is facing challenges, because of the difficulty in the co-assembly of the building blocks is very hard to perform onto a high-curvature and heterogeneous 0D substrate. Here, an efficient active nanointerface-assisted co-assembly approach for design and fabrication of a novel class of yolk–shell Au@ordered mesoporous carbon nanosphere is reported. The key point to this preparation strategy is construction of reactive aldehyde functional groups on the surface of Au@SiO 2 nanospheres, which can react with the carbon source to in situ form a stable covalent bond at their nanointerface. The as-synthesized yolk–shell Au@ordered mesoporous carbon nanosphere not only exhibits uniform spherical morphology and robust porosity but also possesses a totally new ordered mesoporous and fast permeable shell structure, providing a chance for greatly broadening their application scope.
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Zhihui Shen,Qin Zhang
Efficient separation of fine-disseminated rhodochrosite is a challenge in the purification of manganese carbonate ore and a key to reduce the discharge of electrolytic manganese slag. The agglomeration behavior of the fine particles is of importance for flotation separation. In this study, we investigated the agglomeration behavior and aggregate properties of rhodochrosite fines co-induced by oleic acid (OA) and shearing using particle size and structure analysis, surface properties measurement, extended DLVO (EDLVO) theoretical calculation and shear fracture model analysis. The results showed that rhodochrosite fines agglomerates obviously with the increasing OA concentration and pH value, and the average particle size reaches the maximum at the initial OA concentration of 1 × 10 -3 mol/L and pH of 6. The monolayer physical and chemical saturation adsorption of OA cause stronger hydrophobicity of rhodochrosite. Meanwhile, the hydrophobic attractive force between particles is stronger than electrostatic repulsive force, resulting in hydrophobic agglomeration. The moderate stirring rate is conducive to forming larger-sized and denser agglomerates with the critical rate of 500 rpm. However, intensive shearing will cause significant damage to the formed agglomerates. Besides, the volume concentrations of 10–30 μm and 30–45 μm particles increased with the increase of stirring rate after breakage and with a lower value of γ’ than 0.5, suggesting that the agglomerates breakage is mainly controlled by large-scale fragmentation mechanism. Interestingly, as recovering shearing from the higher rate to the initial rate, a secondary agglomeration is achieved by the regrowth of core (30–45 μm particles) and attach of branches and coatings (some < 10 μm and 10–30 μm particles) under the synergy of hydrophobic attraction and shearing. However, it did not fully recover back to the original balanced state before fragmentation, which was due to irreversible damage caused by excessive shearing. This research will be beneficial for in-depth understanding of agglomeration mechanisms of rhodochrosite fines and provide a basis for subsequent efficient flotation separation.
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Xueyan Chen,Honghong Wang,Min Chen,Xiaoxiao Qin,Hong He,Changbin Zhang
Ag-based catalysts are shown to be efficient for formaldehyde (HCHO) oxidation at low temperature, while the role of active Ag species in this reaction remains a controversial issue. In this work, we prepared Ag/TiO 2 catalysts with TiO 2 of different crystal structures (anatase or rutile) as supports and tested their performances in HCHO oxidation. We observed that the crystal structure of the TiO 2 support had a significant influence on the activity of the Ag/TiO 2 catalysts, and Ag/A (anatase) exhibited dramatically superior activity compared with Ag/R (rutile). More interestingly, we observed a clear inflection point in the HCHO conversion curve for the Ag/R catalyst. Combining the results of BET, XRD, TEM, XAFS, H 2 -TPR characterization and DFT calculations, we show that HCHO oxidation on Ag/TiO 2 catalysts is a co-function process of multiple active sites including surface oxygen, Ag 2 O, and metallic Ag species. The low-temperature non-renewable surface oxygen and Ag 2 O species mainly contribute to HCHO oxidation in the low-temperature range, while metallic Ag species are primarily responsible for the reaction at high temperature since metallic Ag is capable of activation of oxygen at high temperature. The relative contents of surface oxygen, Ag 2 O and metallic Ag species are different on the Ag/A and Ag/R catalysts. The dispersion degree of metallic Ag species also differs on the Ag/A and Ag/R, therefore their capacities for oxygen activation are quite dissimilar. The above factors combine to result in distinct catalytic behaviors for Ag/A and Ag/R in HCHO oxidation, as well as the appearance of an inflection point.
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DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2015
·
IF 2.947
Yi Ding,Xirui Lu,Hong Tu,Xiaoyan Shu,Hui Dan,Shuai Zhang,Tao Duan
A series compositions with general stoichiometry as Zr 1− x − y (Nd x Ce y )SiO 4− x /2 (0 ≤ x , y ≤ 0.1) have been obtained by simultaneous substitution of Nd 3+ and Ce 4+ for Zr 4+ in ZrSiO 4 structure. The effects of Nd and Ce content on the phase evolution and microstructure of the ceramics were investigated systematically. The results show that the samples co-doped with total content of Nd 3+ ( x ) and Ce 4+ ( y ) < 0.04 are single zircon phase. However, when the compositions co-doped with total content of Nd 3+ ( x ) and Ce 4+ ( y ) ≥ 0.04 exhibit coexistence of zircon and (Nd,Ce) 2 Si 2 O 7 phase. This demonstrates that the solubility of Nd 3+ and Ce 4+ in zircon structure is around 0.04 mol per mol of zircon. In addition, it is found that the densities of the samples increase with increasing total content of Nd 3+ and Ce 4+ . These results indicate that zircon ceramics are promising candidate for the immobilization of trivalent and tetravalent actinides.
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DOI
高影响因子
IRANIAN POLYMER JOURNAL
·
2023
·Vol. 32
·期 9
·1189-1197
·
IF 3.1
Luo Yanrong,Lu Chunlan,Zhang Xiaolin,Zhan Shiping
With the widespread use of hydrogels, injectable hydrogels for the human body require higher safety and non-toxicity. The most important is the choice of cross-linking agent to be green. In this study, acylated chitosan macromolecular crosslinkers (MCS) were prepared by maleic acid (MA) and chitosan (CS). Its structure was confirmed by FTIR and 1 H NMR and its degree of acylation was also determined. Then, a series of polymeric network hydrogels were investigated. The cross-linked copolymer poly( N -isopropyacrylamide-maleic acid copolymer)/acylated chitosan P(NIPAM- co -MA)/MCS is a series of thermosensitive hydrogels formed by free radical polymerization of NIPAM and MA with MCS as cross-linking agent. The apparent morphology, thermosensitive transition point, and hydrophilicity were investigated. The results show that the hydrogel has a homogeneous pore structure inside. The optimal low critical solution temperature (LCST) was 36.66 ℃. In addition, with the increase of maleic acid content, the water contact angle of the hydrogel is smaller, that is, the hydrophilic effect is better. The results indicate that the P(NIPAM- co -MA)/MCS hydrogels were synthesized successfully and may be a potential material for biomedical, drug delivery, or absorption application. This study can provide a certain research basis and relevant theoretical basis for clinical practice. Graphical abstract
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高影响因子
危险品化学品经营许可证（带存储）