SENSORS AND ACTUATORS B-CHEMICAL
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2024
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IF 8
Li Chen,Jing Geng,Renhui Gao,Qianqian Xu,Zheng Guo
Metal oxide-based gas sensors encounter challenges in effectively detecting hazardous benzenes due to their stability and structural similarities. Here we report an innovative in situ growth method for synthesizing Fe 2 O 3 /Si-FeWO 4 heterostructure nanotubes (NTs) using highly negatively charged multivacant lacunary TBA 4 H 6 [SiW 9 O 34 ]·2H 2 O ( α -SiW 9 ) and Fe 3+ as precursors. A two-step process involving electrospinning followed by a thermal oxidation method was employed to synthesize a series of the uniform Si-FeWO 4 decorated Fe 2 O 3 heterostructure NTs. Considering the rich Fe 2 O 3 /Si-FeWO 4 active interfaces, rapid electron transfer, and high specific surface area, the optimal Fe 2 O 3 /Si-FeWO 4 based sensors demonstrate significantly higher sensitivity (S = 27.5) towards 50 ppm m-xylene in comparison to pristine Fe 2 O 3 (S = 1.8). Furthermore, the Fe 2 O 3 /Si-FeWO 4 exhibits excellent stability, humidity resistance, and high selectivity for m-xylene. This work offers an efficient, cost-effective strategy to synthesize Fe 2 O 3 /Si-FeWO 4 heterostructure NTs, with prospects for synthesizing other advanced sensing heterostructure nanomaterials with lacunary polyoxometalates as precursors.
研究领域:
材料科学
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传感器技术
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环境监测
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
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2018
·
IF 2.011
Teng-Fei Zheng,Xue-Mei Tian,Shu-Li Yao,Chen Cao,Jin-Bao Cai,Sui-Jun Liu
Two Ln III complexes derived from one aromatic monocarboxylate ligand, namely [Tb 2 (mnba) 6 (H 2 O) 4 ] n ( 1 ) and [Dy 2 (mnba) 4 ( μ 3 -OH) 2 (H 2 O)] n ( 2 ) (Hmnba = m -nitrobenzoic acid), have been prepared by similar synthetic procedures and structurally characterized. Complex 1 contains two identical one-dimensional (1D) chains with the syn,syn -carboxylate as linkers, while complex 2 takes the 1D chain structure with μ 3 - - OH and carboxylate as bridge. Magnetic studies indicate that ferromagnetic interactions between intra-chain metal centers exist in 1 and 2 and only complex 2 exhibits field-induced slow magnetic relaxation behavior.
研究领域:
化学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2022
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IF 4.598
Yuting Zhong,Zhirui Wu,Xiaoguang Liu,Ling Li
The combination of multi-metallic alloys and support materials is a promising approach for the design of electrocatalysts. In this study, Pd-M (M = Fe, Sb, Pb, Sn, Ag) bimetallic alloys embedded composites of 2D Ca-based metal–organic framework (Ca-MOF) nanosheets and reduced graphene oxide (rGO) were fabricated by a facile hydrothermal and impregnation reduction method, then applied as ethylene glycol oxidation reaction (EGOR) electrocatalysts. Remarkably, the forward peak current density of the best catalytic performer PdAg@rGO/Ca-MOF is as high as 258.30 mA cm −2 , which is 9.55 times greater than that of Pd/C. It also exhibits the biggest electrochemical active surface area of 3022.51 m 2 g −1 . After 3600 s chronoamperometry test, the retained current density of PdAg@rGO/Ca-MOF is about 87.94 % of the initial current density. These results imply that bimetallic Pd-M@rGO/Ca-MOF have superior electrocatalytic activity and anti-CO poisoning capacity compared to monometallic and Pd/C for EGOR, especially PdAg@rGO/Ca-MOF. The enhanced EGOR performance is due to the combined effect of Pd-M alloys and folded thin layer wrapped nanosheet rGO/Ca-MOF composites.
研究领域:
材料科学
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电化学
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催化
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DOI
高影响因子
Journal of Water Process Engineering
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2025
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IF 6.7
Caiyun Zhang,Jin Qian,Jiajie Wang,Xinyan Zhang,Zhuqiu Sun,Bairen Yang
Herein, a microbial consortia directed domestication approach based on degradation pathways was proposed. This approach employs intermediates capable of promoting ring-opening and dechlorination of m -dichlorobenzene ( m -DCB), in conjunction with m -DCB itself, as substrates for stepwise domestication, with the aim of overcoming the limitation of microbial activity due to the high toxicity of m -DCB. The microbial community analysis for the directed domestication of consortia domesticated that microorganisms responsible for ring-opening and dechlorination were predominant. Meanwhile, the removal efficiency (RE) of m -DCB by directed domestication microbial consortia was significantly higher than the original microbial consortia and abiotic control. To further improve the ring-opening and dechlorination performance of m -DCB, electrical stimulation was introduced as a means of enhancing the directed domestication. Performance tests showed that the highest RE and elimination capacity (EC) of m -DCB were 95.23 % and 23.77 mg/m 3 /h, at an electrical stimulation of 0.7 V, respectively. The microbial community analyses revealed that electrical stimulation led to an increase in the relative abundance of key functional genera (e.g., Rhodanobacter and Pseudomonas ) and functional genes (e.g., catE and dhaA), thereby facilitating the oxidation ring-opening and reductive dechlorination of m -DCB. Metagenomic sequencing further revealed the potential and mechanisms for enhanced biodegradation of m -DCB by the coupled approach of electrical stimulation and directed domestication. The study demonstrates that the biodegradation potential of m -DCB can be enhanced through electrical stimulation based on directed domestication, providing a strategic pathway for microbial construction and improved m -DCB removal from exhaust gases.
研究领域:
环境科学
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微生物学
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DOI
高影响因子
FIBERS AND POLYMERS
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2018
·Vol. 19
·期 6
·1150-1156
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IF 1.353
Fu Rao,Dong Congcong,Sun Changmei,Qu Rongjun,Ji Chunnuan,Zhang Ying
Enzyme degradation method was adopted to prepare porous m -aramid/cellulose blend membranes with high air permeability, water absorbency and moisture permeability. This facile preparation process started by casting a blend membrane from a DMAc/LiCl solution containing m -aramid and cellulose. An enzyme was then used to degrade the cellulose in the blend membrane, resulting in porous structures. Five enzymes including cellulase, chitosanase, papain, lipase, and glucose oxidase, were evaluated and cellulase was found to be optimal. Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) were used to characterize the miscibility and the morphology of the m -aramid/cellulose blend membranes before and after degradation, respectively. The thermal stability of the blend membranes were characterized by thermogravimetric analysis (TGA). The properties including air permeability, water absorbency and moisture permeability of the m -aramid/cellulose blend membranes greatly improved after degradation as compared to those of the pure m-aramid. This paper provided a new approach to preparing novel textile materials with high comfortability.
研究领域:
材料科学
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生物技术
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2019
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IF 4.561
Xiaohui Cheng,Panpan Sun,Shanshan Zhang,Di Sun,Baolai Jiang,Wenshou Wang,Xia Xin
Supramolecular self-assembly is an effective method to assemble organic and inorganic units into various hierarchical structures with excellent properties and is widely used in material and life science. In this article, the self-assembled hollow-sphere and core-in-hollow-shell nanostructures composed of m -phenylenediamine and a novel Preyssler-type polyoxometalates (POM, K 12.5 Na 1.5 [NaP 5 W 30 O 110 ]·15H 2 O (abbreviated as P 5 W 30 )) without template were successfully realized by adjusting the non-covalent interactions. For comparison, we also selected o -phenylenediamine and p -phenylenediamine to investigate whether isomerides have different effects on the self-assembly behavior with P 5 W 30 . The results indicated that only m -phenylenediamine/P 5 W 30 can form hollow spheres and core-in-hollow-shell structure while o -phenylenediamine/P 5 W 30 and p -phenylenediamine/P 5 W 30 cannot which revealed that the self-assembly process can be regulated via isomer effects. Moreover, the detailed analysis of the formation of hollow spheres and core-in-hollow-shell structure are studied and the mechanism is mainly due to the Ostwald ripening . In addition, m -phenylenediamine/P 5 W 30 composite has a good adsorption capacity for methylene blue (MB) dyes, even in the presence of other dyes such as rhodamine B (RB) and amaranth (AR). Our findings further confirmed that supramolecular self-assembly between organic molecules and POM can unique a distinctive “bottom-up” strategy to construct diversiform structures with functional properties.
研究领域:
材料科学
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超分子化学
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产品关联
DOI
高影响因子
IRANIAN POLYMER JOURNAL
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2018
·Vol. 27
·期 8
·537-544
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IF 1.278
Li Peipei,Liu Kai,Zhang Binbin,Liu Jinhui,Hua Jing
Coordination polymerization of butadiene was initiated by a catalyst system consisting of tributyl phosphate (TBP) as ligand, molybdenum pentachloride as primary catalyst and triethyl aluminum substituted by m -cresol as co-catalyst. The effects of the substitution of m -cresol on the activity of the catalyst system, molecular weight and molecular weight distribution, intrinsic viscosity and microstructures of the resulting polymers were investigated in details. The molecular weight and molecular weight distribution of the polymerization products were determined by GPC. The microstructure of the polymerization products was characterized by FTIR, 13 C NMR and DSC techniques. The experimental results indicated that the polymerization activity of the reaction system and the molecular weight of the polymerization products gradually increased with the increase of the substitution content of m -cresol, namely, Al(OPhCH 3 ) 2 Et > Al(OPhCH 3 )Et 2 > Al(OPhCH 3 ) 0.5 Et 2.5 >AlEt 3 . The 1,2-structure contents of the polymerization products could be adjusted between 89 and 91% through the control of the substitution of m -cresol, and there was minute quantities of crystalline structures in the resulting polymers due to the increasing content of the syndiotactic 1,2-polybutadiene. In a word, the existence and increase of steric hindrance of m -cresol made it easier for polymerization products to form interdisciplinary 1,2-structure.
研究领域:
高分子化学
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催化化学
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产品关联
DOI
高影响因子
BIORESOURCE TECHNOLOGY
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2017
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IF 5.651
Bai-ren Yang,Zhu-qiu Sun,Li-ping Wang,Zhao-xia Li,Cheng Ding
A strain, Brevibacillus agri DH-1, isolated from dry lands was used to remove m -dichlorobenzene. After 48 h culturing, the concentrations of m -dichlorobenzene decreased from 26–130 to 7.87–28.87 mg/L and dry cell weight for bacterial growth reached 52.43–75.05 mg/L. The growth and degradation kinetics were analyzed by the fitting of Haldane-Andrews model and pseudo first-order model. A degradation pathway was proposed according to major intermediates (phenol), chloride ion variation, ring-opening enzyme activity, and high mineralization (0.47 g Cl- /g m -dichlorobenzene , 0.65 g co2 /g m -dichlorobenzene , 0.15 g DCW /g m -dichlorobenzene ). In addition, the performance in a biotrickling filter (BTF) was evaluated through removal efficiency and pressure drop values with increasing inlet loading rate from 4.10 to 122.57 g/m 3 /h at three empty bed residence time points (30 s, 60 s, and 90 s). The results demonstrated that strain DH-1 possessed high removal efficiency and stable operation in a BTF.
研究领域:
环境生物学
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微生物学
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污染控制技术
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2019
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IF 7.65
Ping Chen,Qianxin Zhang,Xiaoshan Zheng,Cuiwen Tan,Meihui Zhuo,Tiansheng Chen,Fengliang Wang,Haijin Liu,Yang Liu,Yiping Feng,Wenying Lv,Guoguang Liu
Widespread usage of the sulfonamide class of antibiotics is causing increasing ecotoxicological concern, as they have the capacity to alter ambient ecosystems. Photocatalytic technology is an attractive yet challenging strategy for the degradation of antibiotics. For this work, the phosphate modification of m-Bi 2 O 4 (Bi 2 O 4 -P) was prepared via a one-step hydrothermal process involving sodium bismuthate and sodium phosphate, which was employed for the degradation of sulfamethazine (SMZ) under visible light irradiation. The 0.5% Bi 2 O 4 -P exhibited excellent photocatalytic performance, which was 1.9 times that of pure m-Bi 2 O 4 . The photocatalytic degradation kinetics and mechanism of SMZ was investigated at different pH, whereupon it was revealed that m-Bi 2 O 4 -P exhibited improved SMZ adsorption and photocatalytic activities in contrast to pure m-Bi 2 O 4 . Compared with other four sulfonamide antibiotics, structures that contained additional methyl on the pyrimidine could be more easily attacked by phosphate modified m-Bi 2 O 4 . Reactive species (RS) scavenging experiments revealed that h + was primarily responsible for the degradation of SMZ. Further studies of RS by ESR technology, and the results of photoelectrochemical properties showed phosphate-modified m-Bi 2 O 4 could make greater use of photogenerated carriers, thereby producing additional RS. Based on the HRAM LC–MS/MS and the Frontier Molecular Orbital Theory, the degradation pathways of SMZ were proposed.
研究领域:
环境科学
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材料科学
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化学
✓ 已验证
DOI
PubMed
高影响因子
RSC Advances
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2014
·Vol. 4
·期 92
·51008-51015
·
IF 3.708
Jing Wang,Peng Guo,Maofeng Dou,Jing Wang,Yajuan Cheng,Pär G. Jönsson,Zhe Zhao
The g-C3N4/m-Ag2Mo2O7 composite photocatalysts with well-aligned band structures are successfully fabricated by a simple two-step method with different mass contents of m-Ag2Mo2O7. The as-prepared samples are evaluated as photocatalysts toward rhodamine B (RhB) degradation in aqueous solution under visible light irradiation (λ > 420 nm). The results demonstrate that the photocatalytic activities of the composites are strongly influenced by the weight ratio of g-C3N4 to m-Ag2Mo2O7. When it is 6 : 1, the composite exhibits the highest photocatalytic efficiency. More specifically, this value is as high as 3.4 and 6.1 times that of pure g-C3N4 and P25 respectively. In order to investigate the mechanism causing the enhanced photocatalytic degradation, the band structures are determined by UV-vis diffuse reflection spectroscopy and the Mott–Schottky technique. Moreover, the reactive radicals involved in the photocatalytic process are examined in detail via active species trapping (AST) experiments. The improved photocatalytic activities can be attributed to the efficient separation of the photo-induced charge carriers and the strong redox capacities benefit from the synergetic effect between g-C3N4 and m-Ag2Mo2O7.
研究领域:
材料科学
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环境科学
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光催化技术
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Xian Li,Jiafeng He,Weilong Zhang,Lijun You,Jumei Li
A sandwich structured Fe 3 O 4 /Ag/m(TiO 2 -ZrO 2 ) magnetic nanosphere with Ag nanoparticles as an interim layer was fabricated with in situ deposition of Ag nanoparticles onto Fe 3 O 4 nanospheres and subsequent coating an outmost shell of mesoporous TiO 2 -ZrO 2 . As compared to Fe 3 O 4 /m(TiO 2 -ZrO 2 )/Ag with Ag nanoparticles as the outmost layer, unique Fe 3 O 4 /Ag/m(TiO 2 -ZrO 2 ) sandwich nanospheres possess higher efficient charge migration and larger specific surface area disclosed by the BET and photoelectrochemical characterizations, so they present improved photocatalytic activity toward Cr(VI) reduction. In addition, they have high thermal stability because mesoporous TiO 2 -ZrO 2 outmost shell could protect the interim Ag nanoparticles from damage and agglomeration at high temperature. Results showed reduction efficiency of Cr(VI) of Fe 3 O 4 /Ag/m(TiO 2 -ZrO 2 ) reached 98.4 % in 30 min, as 1.6 times as that of Fe 3 O 4 /m(TiO 2 -ZrO 2 )/Ag. The Fe 3 O 4 /Ag/m(TiO 2 -ZrO 2 ) still obtained 91.3 % and 87.9 % reduction ratio after calcination at 500 ℃ and recycling 5 times, respectively. The photocatalytic mechanism was also revealed by scavenger experiments and ERP analysis. This work provided a good example for further design and preparation of magnetic photocatalysts with high performance for the remediation of heavy metal pollutants.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Reaction Kinetics Mechanisms and Catalysis
·
2024
·
IF 1.7
Gao Hang,Zhu Yuqin,Luo He’an,Lv Yang,Liu Pingle
Co–xCaO/g-C 3 N 4 catalysts were prepared using incipient wetness impregnation method and applied in isophthalonitrile hydrogenation to M-xylenedimethylamine. The characterization results and experimental data indicate that introduction of CaO crates large number of basic sites and leads to electron rich Co, hence inhibits the side reaction and improves the selectivity to M-xylenedimethylamine. 10Co–2CaO/g-C 3 N 4 gives the best catalytic performance of 100% conversion of isophthalonitrile and 95% selectivity to M-xylenedimethylamine without any alkaline additives in the reacion system. This work is valuable for the design and preparation of hydrogenation catalysts with rich basic sites and provides a green process for nitrile compounds to amine.
研究领域:
催化化学
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绿色化学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）