NEW JOURNAL OF CHEMISTRY
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2023
·Vol. 47
·期 16
·7583-7587
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IF 3.3
Baole Li,Tiansheng He,Chen Zuo,Zhi Cao,Taihong Yan,Weifang Zheng
Catalytic decomposition of hydrazine nitrate is a very important research topic in the environmental protection field. Herein, we used an Ru/C catalyst for the decomposition of hydrazine nitrate in HNO3, and the reaction kinetics and mechanism were studied in detail. The kinetics study of the decomposition of hydrazine nitrate (0.01 M) was conducted in the temperature range 313–343 K in 0.1 M HNO3 in the presence of Ru/C. The apparent activation energy for this reaction was 46.6 kJ mol−1 according to a fitting of the experimental data, while the reaction order was 1.5. It was also found that the reaction pathway of the catalytic decomposition of hydrazine nitrate on the Ru/C catalyst involved two processes: heterogeneous catalytic disproportionation of hydrazine nitrate at the catalyst surface and oxidation of hydrazine nitrate with catalytically generated HNO2.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2023
·
IF 22.1
Zihao Cui,Qianqian Zhang,Hui Fu,Qihao Liu,Xiaolei Liu,Yaqiang Wu,Peng Gao,Zeyan Wang,Zhaoke Zheng,Hefeng Cheng,Yuanyuan Liu,Ying Dai,Baibiao Huang,Peng Wang
Herein, a facile anti-solvent preparation strategy is proposed to fabricate lead-free halide perovskite Cs 3 Bi 2 Br 9 with TiO 2 , which boosts photocatalytic activation of C(sp 3 )−H bonds in toluene oxidation . TiO 2 not only works as nucleation center to reduce the particle size of perovskite, but could form type II heterojunction with Cs 3 Bi 2 Br 9 , thus improving the photocatalytic performance of the TiO 2 /Cs 3 Bi 2 Br 9 composite. Under AM 1.5 G simulated sunlight irradiation, the optimal TiO 2 /Cs 3 Bi 2 Br 9 composite exhibits both high production rate (9692.5 μmol g −1 h −1 ) and selectivity (91 %) of benzaldehyde product. As verified by in-situ ESR, in-situ FT-IR and DFT calculations, •O 2 − and h + are demonstrated to be the main active species in this process. This work provides a new insight into the design of high-performance lead-free perovskite photocatalysts for organic synthesis.
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DESALINATION
·
2023
·
IF 9.9
Jing Jiang,Ying Xu,Chengmei Tang,Xinzhi Wang,Wei Wei,Lunhong Ai
Plasmonic nanostructures have been demonstrated to be an important class of photothermal absorbers, facilitating solar vapor generation by plasmonic heating. However, the high cost and sophisticated preparation of commonly used plasmonic noble metals pose significant obstacles to practical applications. Here, we report for the first time an affordable plasmonic evaporation system that combines the porous carbon frameworks encapsulated semimetal Bi nanoparticles (Bi-C) and carbon felt (CF). The hydrophilic Bi-C and porous network structure of CF favor effective light harvesting and fast water transmission, promoting photothermal conversion and mass transfer during solar evaporation. Under one sun irradiation, the designed Bi-C/CF exhibits the robust behavior for solar steam generation, achieving an expected high evaporation rate of 1.50 kg·m −2 ·h −1 and a comparable evaporation efficiency of 91.9 %. As a result, the excellent performance of Bi-C/CF not only benefits the sustainable freshwater production from saline water and seawater, but also enables efficient wastewater purification for energy-saving water source remediation.
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APPLIED ENERGY
·
2023
·
IF 11.2
X.C. Han,H.J. Xu,W.S. Hua
MgO/Mg(OH) 2 is a potential thermochemical material with high heat density and stable characteristics. Four additives including Carbons, Carbides, Nitrides and Titanates were selected for modification. The decomposition behavior and kinetics analysis were both investigated. It is found that Titanates has a catalytic effect, and the tested energy storage density can be increased to 971 J/g. The spectral absorption of candidate material with 6% graphite can reach to more than 50% and 6% CaTiO 3 has an extremely high absorption in the short wave segment. In microscopic morphology, Mg(OH) 2 particles sintered at high temperature will form adhesion agglomeration. Due to the special microstructures of candidate materials, agglomeration phenomenon is effectively alleviated and the candidate materials with 6% graphite or CaTiO 3 are both ideal modified materials. The optimized mechanism of modified material with 6% CaTiO 3 was illustrated by model. To investigate the kinetics mechanism, the model of non-isothermal decomposition was developed. The activation energies of pure material, sample with 6%graphite and sample with 6%CaTiO 3 are 141 kJ/kg, 113 kJ/kg and 122 kJ/kg respectively. The shape factor polynomials and kinetic governing equations were obtained. According to the established kinetics equations, the heating processes at 8 K, 12 K and 25 K/min were predicted. The study can provide a necessary kinetics reference for the numerical calculation of thermochemical heat storage.
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2023
·
IF 11.4
Xiang Wan,Kai Shi,Huan Li,Fangxie Shen,Shan Gao,Xiangmei Duan,Shen Zhang,Chunning Zhao,Meng Yu,Ruiting Hao,Weifang Li,Gen Wang,Maria Peressi,Yinchang Feng,Weichao Wang
Catalytic decomposition of aromatic polluters at room temperature represents a green route for air purification but is currently challenged by the difficulty of generating reactive oxygen species (ROS) on catalysts. Herein, we develop a mullite catalyst YMn2O5 (YMO) with dual active sites of Mn3+ and Mn4+ and use ozone to produce a highly reactive O* upon YMO. Such a strong oxidant species on YMO shows complete removal of benzene from −20 to >50 °C with a high COx selectivity (>90%) through the generated reactive species O* on the catalyst surface (60 000 mL g–1 h–1). Although the accumulation of water and intermediates gradually lowers the reaction rate after 8 h at 25 °C, a simple treatment by ozone purging or drying in the ambient environment regenerates the catalyst. Importantly, when the temperature increases to 50 °C, the catalytic performance remains 100% conversion without any degradation for 30 h. Experiments and theoretical calculations show that such a superior performance stems from the unique coordination environment, which ensures high generation of ROS and adsorption of aromatics. Mullite’s catalytic ozonation degradation of total volatile organic compounds (TVOC) is applied in a home-developed air cleaner, resulting in high efficiency of benzene removal. This work provides insights into the design of catalysts to decompose highly stable organic polluters.
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Shiquan Zhang,Jian Zhang,Suohui Yang,Minxian Shi,Junguo Li,Qiang Shen
Ablation material had been widely used in aerospace attributed to its reliability and strong adaptability but was usually accompanied by low strength at higher temperatures. Here, a high flexural strength of 66.91 MPa after ablation at 1500 °C of carbon fiber/boron phenolic resin (CF/BPR) composite modified by MoSi 2 and mica was reported. With the proportion of MoSi 2 and mica was 9:1, the formed appropriate content of the liquid phase improved the reactivity of MoSi 2 powders and provided a suitable interfacial state between CF and the matrix. The result of the oxygen-acetylene test showed that the mass ablation and the linear ablation reduced to 0.034 g/s and 0.006 mm/s, respectively. Owing to the formed liquid phase wrapping the carbon fiber and ceramic layer on the surface improved the ablation resistance. These high-strength CF/BPR composites have strong potential in new aerospace materials.
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Materials
·
2023
·Vol. 16
·期 6
·2495
·
IF 3.4
Qian Yang,Cuiyan Li,Haibo Ouyang,Ruinan Gao,Tianzhan Shen,Jianfeng Huang
Porous (Ta0.2Nb0.2Ti0.2Zr0.2Hf0.2)C high-entropy ceramics (HEC) with a dual-porosity structure were fabricated by pressureless sintering using a mixture powder of ceramic precursor and SiO2microspheres. The carbothermal reduction in the ceramic precursor led to the formation of pores with sizes of 0.4–3 μm, while the addition of SiO2microspheres caused the appearance of pores with sizes of 20–50 μm. The porous HECs exhibit competitive thermal insulation (4.12–1.11 W·m−1k−1) and extraordinary compressive strength (133.1–41.9 MPa), which can be tailored by the porosity of the ceramics. The excellent properties are ascribed to the high-entropy effects and dual-porosity structures. The severe lattice distortions in the HECs lead to low intrinsic thermal conductivity and high compressive strength. The dual-porosity structure is efficient at phonon scattering and inhabiting crack propagations, which can further improve the thermal insulation and mechanical properties of the porous HECs.Keywords:high-entropy carbides;pressureless sintering;porous ceramics;thermal conductivity;compressive strength
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CONSTRUCTION AND BUILDING MATERIALS
·
2023
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IF 7.4
Chenchen Xiong,Yulin Wang,Yang Zhou,Xingyu Liu,JinHui Tang,Pan Feng
An ordered structure and high mechanical property of calcium silicate hydrate (C-S-H) gel has been always pursued in the field of cementitious materials. In this paper, compacted and layer-by-layer stacking C-S-H plates were fabricated based on Layer-by-Layer (LBL) method and H-cell penetration (HCP) method through cation exchange membrane templating. This new way changed the randomly packing structure of traditional C-S-H, and synthesized a high-orderly C-S-H platelets with denser structure. Based on molecular dynamics simulations, it can be attributed to the strong adsorption and nucleation sites contributed by sulfonic acid groups on the cation exchange membrane. Besides, AFM indentation experiments indicate this C-S-H owns significantly higher elastic modulus than traditional C-S-H, while the mechanical properties can be further increased by the addition of PVA and the regulation of reaction time. This new type C-S-H may pave the way to the preparation of high-performance concrete in the future.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
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2022
·Vol. 169
·期 12
·127506
·
IF 4.386
Qi Wang,Jinjin Zhang,Wenjing Liu,Jianying Qu
Herein, the copper-based metal organic framework (CuBDC) modified with MoO3 nanorods uniformly distributed on its surface (MoO3@CuBDC) was synthesized by a one-step solvothermal method, and then was treated with high temperature calcination. A series of characterizations demonstrate that MoO3@CuBDC was transformed into a ternary composite of Cu2O nanospheres, Mo2C, and carbon material (Cu2O/Mo2C@C) after the treatment. Moreover, a novel electrochemical sensor based on Cu2O/Mo2C@C modified glassy carbon electrode (GCE) was constructed for simultaneous sensitive detection of catechol (CC) and hydroquinone (HQ). Due to the excellent electrocatalytic ability of Cu2O/Mo2C@C, the prepared sensor exhibits good electroanalytical performance, which shows good linearity in the concentration ranges of 0.50–200.00 μM for CC and HQ with the limits of detection of 0.38 μM and 0.13 μM. In addition, this sensor can be used to detect CC and HQ simultaneously in real samples with satisfactory results.
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Journal of Materials Chemistry A
·
2022
·Vol. 11
·期 2
·800-808
·
IF 14.511
Yixuan Lv,Dandan Ma,Kunli Song,Siman Mao,Zhetong Liu,Dan He,Xuewen Zhao,Tianhao Yao,Jian-Wen Shi
The gradual depletion of global fossil energy and environmental pollution make the development of hydrogen energy an imminent concern. Two-dimensional g-C3N4 (CN) based heterostructures have attracted considerable research interest in the photocatalytic H2 evolution field, but the unsatisfactory interfacial contact between metal-free CN and other metal oxide/sulfide semiconductors usually results in a low transfer efficiency of charge carriers. Herein, we develop a new homojunction by in situ decoration of CN nanosheets with a C–N compound broken by s-triazine units (abbreviated to BST). The resultant CN/BST homojunction presents significantly enhanced photocatalytic H2 generation (12.47 mmol g−1 h−1), which is about 4 and 33 times higher than that of pristine CN (3.086 mmol g−1 h−1) and BST (0.376 mmol g−1 h−1), respectively. It is revealed that the BST fragments tightly anchored on the CN nanosheets act as electron-trapping agents to rapidly transfer photogenerated electrons from the CN conduction band to generate hydrogen, effectively inhibiting the recombination of photogenerated electrons and holes. The work shows that the construction of a suitable homojunction is an effective way to obtain high photocatalytic activity.
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Frontiers in Bioengineering and Biotechnology
·
2022
·
IF 6.064
Shao Lupeng,Wang Chao,Liu Yu,Wang Meng,Wang Luyan,Xu Feng
Lignin, an abundant aromatic biopolymer, has the potential to produce various biofuels and chemicals through biorefinery activities and is expected to benefit the future circular economy. Microwave-assisted efficient degradation of lignin in methanol/formic acid over Ru/C catalyst cooperated with metal chloride was investigated, concerning the effect of type and dosage of metal chloride, dosage of Ru/C, reaction temperature, and reaction time on depolymerized product yield and distribution. Results showed that 91.1 wt% yield of bio-oil including 13.4 wt% monomers was obtained under the optimum condition. Yields of guaiacol-type compounds and 2,3-dihydrobenzofuran were promoted in the presence of ZnCl2. Formic acid played two roles: (1) acid-catalyzed cleavage of linkages; (2) acted as an in situ hydrogen donor for hydrodeoxygenation in the presence of Ru/C. A possible mechanism for lignin degradation was proposed. This work will provide a beneficial approach for efficient depolymerization of lignin and controllable product distribution.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
·
IF 9.9
Feng-Di Tu,Zi-Yun Wu,Pan Guo,Li-Xiao Shen,Zi-Yu Zhang,Yun-Kun Dai,Miao Ma,Jing Liu,Bin Xu,Yun-Long Zhang,Lei Zhao,Zhen-Bo Wang
Platinum group metal (PGM)-free catalysts represented by nitrogen and iron co-doped carbon (Fe-N-C) catalysts are desirable and critical for metal-air batteries , but challenges still exist in performance and stability. Here, cerium oxides (CeO x ) are incorporated into a two-dimensional Fe-N-C catalyst (FeNC-Ce-950) via a host-guest strategy. The Ce 4+ /Ce 3+ redox system creates a large number of oxygen vacancies for rapid O 2 adsorption to accelerate the kinetics of oxygen reduction reaction (ORR). Consequently, the as-synthesized FeNC-Ce-950 catalyst exhibits a half-wave potential ( E 1/2 ) of 0.921 V and negligible decay (<2 mV for Δ E 1/2 ) after 5,000 accelerated durability cycles, significantly outperforming most of ORR catalysts reported in recent years and precious metal counterparts. When applied in a zinc-air battery, it demonstrates a peak power density of 175 mW cm −2 and a specific capacity of 757 mAh g Zn −1 . This study also provides a reference for the exploration of Fe-N-C catalysts decorated with variable valence metal oxides .
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