JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2022
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IF 6.76
Junfeng Yang,Yuyang Wu,Yanhui Dong,Hao Cui,Chenyang Shi,Hang Sun,Shengyan Yin
Herein, a ternary Bi@H-TiO 2 /B-C 3 N 4 type II heterostructure is successfully designed and prepared via metal Bi as cocatalyst for photocatalytic H 2 generation. As expected, under λ > 300 nm light, the highest photocatalytic hydrogen production rate (HPR) of Bi@H-TiO 2 /B-C 3 N 4 is up to 223.08 μmol g −1 h −1 . Excitingly, under visible light (λ > 400 nm), the highest HPR of Bi@H-TiO 2 /B-C 3 N 4 is increased to 18.84 μmol g −1 h −1 , which is about 67.3 times, 37.7 times and 6.8 times as high as that of H-TiO 2 , B-C 3 N 4 and H-TiO 2 /B-C 3 N 4 under the same conditions, respectively. Moreover, the electrochemical impedance spectroscopy and transient photocurrent tests manifest that the interface resistance of Bi@H-TiO 2 /B-C 3 N 4 composite decreases and the photocurrent density increases after loading metal Bi. These results indicate that loading metal Bi as cocatalyst (providing more electron trapping sites) is beneficial to improve photocatalytic activity in the type II heterostructure composite. And the electron transfer directions (B-C 3 N 4 → H-TiO 2 → Bi or B-C 3 N 4 → Bi) are proved by ultraviolet photoelectron spectroscopy test. Therefore, the Bi@H-TiO 2 /B-C 3 N 4 photocatalyst with strong visible light absorption is expected to be a promising candidate in photocatalytic fields under visible light.
研究领域:
材料科学
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能源化学
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光催化
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Tarek A. Gad-Allah,Ruiyang Zhang,Yi Wang,Ying Zhou
Various factors control the photocatalyst efficiency including the lifetime of photogenerated charge carriers, photocatalyst surface energy, and light harvesting efficacy. In this study, the defective (001)-TiO 2 -x/h-BN composite was synthesized by a facile one-pot method to merge the fantastic features of the reactive metastable (001) facet and self-defects in TiO 2 anatase crystals with the 2D h-BN. Pure anatase phase of TiO 2 was obtained by the suggested preparation method, which contains ∼33 % of the exposed (001) facet. The predominancy of oxygen vacancy in TiO 2 crystals was proved experimentally and theoretically by the DFT calculations. The defects in TiO 2 along with the incorporated h-BN caused better light harvesting and longer charge lifetime. The prepared defective (001)-TiO 2 -x/h-BN was applied efficiently for NO removal with very limited release of the toxic NO 2 by-product as an environmental application. The detected oxygen vacancy in TiO 2 along with h-BN were found to play a synergistic enhancement for NO removal. However, more defects reduced the overall activity because of rapid oxidation of oxygen vacancies on surface of the photocatalyst. To sum up, the defective (001)-TiO 2 -x/h-BN composite can be considered as a promising material for environmental applications.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Frontiers in Chemistry
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2018
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IF 4.155
She Houde,Li Liangshan,Zhou Hua,Wang Lei,Huang Jingwei,Wang Qizhao
Selective activation of saturated C–H bond in hydrocarbons to produce high-value-added chemicals is of great significance for chemical synthesis and transformation. Herein, we present a facile procedure to achieve Ni-doped CdS nanoparticles with mixed (cubic and hexagonal) phases, as well as its application to the photocatalytic activation of saturated primary C–H bond of toluene and its derivatives. The photocatalytic oxidation rate of toluene into benzaldehyde of formation reached up to 216.7 μmolh−1g−1 under visible light irradiation. The excellent photocatalytic performance of Ni(II)-doped CdS [Ni(II)/CdS] can be attributed to its unique structural assembly with cubic and hexagonal phases and also the addition of Ni ions, together taking effect in promoting the separation of photogenerated charge carriers. The possible reaction mechanism for the photocatalytic selective oxidation is illustrated in this work. The band width of the as-prepared mixed phase CdS is reduced, which can effectively expand the response range and improve photocatalytic performance.
研究领域:
化学合成
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材料科学
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光催化反应
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产品关联
DOI
PubMed
高影响因子
ENERGY & FUELS
·
2022
·
IF 4.654
Xianqiang Huang,Yanan Cui,Gang Liu,Haitao Wang,Junyu Ren,Yalin Zhang,Guodong Shen,Lingling Lv,Huai-Wei Wang,Yi-Fa Chen
With the arising concern of environmental problems, the removal of polycyclic aromatic hydrocarbons or sulfides in fuel oils is an indispensable process to achieve a clean energy source. At present, direct catalytic oxidation of benzyl C–H bonds of polycyclic aromatic hydrocarbons and sulfides to corresponding carbonyl compounds is very attractive, yet their simultaneous oxidation using a single economical-friendly catalyst is not yet well established. Here, three imidazole-decorated copper polyoxomolybdate frameworks (Im-Cu-PMoFs) are successfully synthesized by tuning different imidazole derivatives. These Im-Cu-PMoFs can serve as effective heterogeneous catalysts for the one-pot oxidation of benzylic hydrocarbons and sulfides to produce carbonyl compounds. Specifically, Im-Cu-PMoFs-3 as a single component catalyst exhibits high activity and prominent selectivity (conversion up to 99% and selectivity up to 99%) in the one-pot reaction. In addition, the possible reaction pathway and active sites are supported by sufficient characterizations and DFT calculations, which reveal the synergistic effect of Mo(VI) and Cu(II) centers in the one-pot catalysis reaction. These dual function-validated frameworks hold much promise in the exploration of novel catalysts for applications like continuous catalytic or flow bed reaction.
研究领域:
化学
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环境科学
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材料科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Lan Ding,Fenghua Bai,Burenbayaer Borjigin,Yuning Li,Huiqin Li,Xiaojing Wang
Solar-energy-driven CO 2 conversion into valuable chemical fuels holds great renewable potential. However, most photocatalysts' weak CO 2 adsorption limits more artificial photosynthesis for further utilization. Herein, we present an in situ assembling approach to produce stable Cs 2 AgBiBr 6 /Ce-UiO-66-H composite, in which a tight contact interface between the two participated components was constructed. Benefiting from the photocatalytic properties and high adsorption capacity for CO 2 , the optimized 20Cs 2 AgBiBr 6 /Ce-UiO-66-H adsorption-photocatalyst exhibits outstanding performance for reductive CO 2 deoxygenation with considerable CO generation rate (309.01 μmol g −1 h −1 ) under simulated solar light irradiation with 300 W Xe lamp, which is about 2.1 and 2.7 times than that of pure Cs 2 AgBiBr 6 and Ce-UiO-66-H, respectively. The excellent catalytic conversion of CO 2 is ascribed to the effective solar harvest and quickly photo-excited carriers’ separation in such assembled architecture. Importantly, due to the in-situ synthesis, Cs 2 AgBiBr 6 QDs are intercalated in the Ce-UiO-66-H frameworks and it could lead to improved stability and induce abundant oxygen vacancies in Cs 2 AgBiBr 6 /Ce-UiO-66-H, which can maintain unchangeable CO 2 conversion rate under wet air with consecutive ten hours of the recycling test. In this work, the combining metal–organic frameworks and lead-free halide perovskite provide great potential for artificial photocatalytic CO 2 -to-CO conversion under a mild gas–solid reaction condition via utilizing solar energy.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
高影响因子
Cell Reports Physical Science
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2021
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IF 0
Ming Shi,Hongpeng Zhou,Wenming Tian,Bin Yang,Songqiu Yang,Keli Han,Rengui Li,Can Li
Although bismuth (Bi)-based halide perovskites have attracted profound attention in photocatalysis, the undesirable photophysical properties are not well modulated, and the effect of surface structure on adsorption and activation of reactant molecules is still unclear. Here, we report the structural design, via precise incorporation of antimony (Sb) atoms into the host lattice of Cs 3 Bi 2 Br 9 , of a series of B-site bimetallic perovskites (Cs 3 Sb x Bi 2-x Br 9 , 0 ≤ x ≤ 2) with tunable band structures. The incorporation of Sb dramatically enhances the separation and transfer of photogenerated charges and prolongs their lifetimes. Considering these advantages, Cs 3 SbBiBr 9 exhibits significantly enhanced photocatalytic activities in challenging benzylic C–H activation while maintaining a high selectivity of 96%. Theoretical calculations reveal that the introduction of Sb breaks the symmetry of the local structure and leads to asymmetric charge distribution that not only increases the adsorption capacity for methylbenzene but also reduces the energy barriers for C–H bond activation.
研究领域:
材料科学
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光化学
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DOI
Marine Drugs
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2021
·Vol. 19
·期 2
·79
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IF 5.118
Hengju Ge,Di Zhang,Muran Shi,Xiaoyuan Lian,Zhizhen Zhang
In 2019, streptoglutarimide H (SGH) was characterized as a new glutarimide from the secondary metabolites produced by a marine-derived actinomyceteStreptomycessp. ZZ741 and shown to have in vitro antiglioma activity. However, the antiproliferative activity and potential mechanism of SGH against lung cancer cells have not yet been characterized. This study demonstrated that SGH significantly inhibited the proliferation of different lung cancer cells. In terms of mechanism of action, SGH downregulated cell cycle- and nucleotide synthesis-related proteins to block cell cycle at G0/G1 phase, reduced the expression levels of glycolytic metabolic enzymes to inhibit glycolysis, and downregulated the important cancer transcription factor c-Myc and the therapeutic target deubiquitinase USP28. Potent anticancer activity and multiple mechanisms indicated SGH to be a novel antitumor compound against lung cancer cells.Keywords:Streptoglutarimide H;lung cancer cells;antiproliferative activity;cell cycle block;glycolysis;USP28;c-Myc
研究领域:
肿瘤学
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药理学
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海洋生物学
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产品关联
DOI
PubMed
高影响因子
Journal of Building Engineering
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2024
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IF 6.7
Baomin Wang,Weigao Ding,Chengcheng Fan,Fei Liu,Wenxin Lu,Haoxiang Yang
C-S-H gel is a complex cementitious system, and the properties present significant difference with various Ca/Si ratios. The immobilization mechanism of three heavy metals in C-S-H gel at various Ca/Si ratios was investigated in this work from the prospect of the physical adsorption and chemical immobilization. Results showed that higher Ca/Si ratios can result in an increase in silicon chain polymerization, and lower BET specific area, and C-S-H gel with various Ca/Si ratios showed the excellent immobilization for heavy metals. Pb(II) and Zn(II) can form hydroxyl complex polyhedra in C-S-H under strongly alkaline environments, and increase the silicon chain polymerization degree similar to the doping of C-S-H gel by Al. However, Cd(II) was immobilized in the C-S-H gel with the formation of a solid solution under the action of ion exchange with Ca(II), rather than in the form of hydroxyl complex polyhedral and cadmium hydroxide coprecipitates. The highest adsorption capacity of Pb(II) was realized in C-S-H gel with a Ca/Si molar ratio of 0.9, reaching 95.6006 mg/g. Pb(II) was mainly immobilized in C-S-H gel via physical and chemical adsorption, and the effect of chemical adsorption tended to be significant as the Ca/Si molar ratio increased. And the formation of Pb 8 Ca(Si 2 O 7 ) 3 can be detected in C-S-H gel with a higher Ca/Si molar ratio.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
Journal of Building Engineering
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2025
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IF 7.4
Hong Zhou,Shuzhen Zheng,Huina Li,Qianping Ran,Jianfeng Ma
Calcium silicate hydrates (C–S–H) is the primary product of cement hydration, and its structure and properties substantially influence the mechanical performance of cement-based materials. However, in practical applications, pure C–S–H has some shortcomings, such as susceptibility to microcracking and high porosity, which can reduce the durability and overall mechanical performance. To solve these problems, two different sizes of cellulose (microcrystalline cellulose nanoparticles and carboxylated cellulose nanofibers) were used to modify C–S–H nanocomposites, which were synthesized by hydrothermal synthesis. The characterization of the composites was analyzed in detail using methods such as TEM, FT-IR, and TGA. The results of these methods showed that cellulose was uniformly dispersed in the C–S–H matrix on the nanoscale, which formed an interwoven mesh structure. The mechanical properties of the cement paste were tested, including flexural strength and compressive strength. In addition, the cement paste containing the nanocomposites was analyzed by SEM, XRD and hydration heat tests. The results of these tests showed that the seed effect of C–S–H and the effective bridging effect of needle-like cellulose crystals on crack extension significantly improved their mechanical properties.
研究领域:
材料科学
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土木工程
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纳米技术
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产品关联
DOI
高影响因子
Materials
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2023
·Vol. 16
·期 14
·4979
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IF 3.4
Wen Zhong,Jiazhi Dong,Siqiang Chen,Zhe Tong
The synergistic effect of different types of solid particles in liquid lubricants is of great interest. In this work, g-C3N4nanosheets were initially prepared using a calcination method and then as-prepared, and h-BN were used as lubricating additives to the white oil. A comparison between the mixed additives and the single g-C3N4or h-BN additives revealed that the base oil with the addition of g-C3N4and h-BN showed the best lubricating properties. The results show a 12.3% reduction in friction coefficient, resulting in a 68.6% reduction in wear rate compared to the white oil when filled with 0.5 wt% g-C3N4and h-BN (1:1 by weight). Moreover, the addition of g-C3N4and h-BN improves the high-temperature lubrication properties of the white oil. However, the friction coefficient and wear rate increase with increasing oil temperature. The large contact area between g-C3N4and its sliding counterpart and the strong adhesive force between h-BN and its sliding counterpart improve the film formation efficiency, leading to enhanced tribological properties under oil lubrication conditions.
研究领域:
材料科学
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机械工程
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表面工程
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产品关联
DOI
PubMed
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
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2021
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IF 6.141
Feifei Zhou,Ganghua Pan,Renjie Mi,Mimi Zhan
Enhancing the properties of concrete using C-S-H seed has been a challenging task due to its agglomeration in the cement matrix. Here, for ensuring synthetic C-S-H disperse well in the cement matrix, it was first synthesized in situ on fly ash (FA) by co-precipitation method, and the C-S-H grown in situ on FA (C-S-H@FA) was received. And then, its phase composition, morphology and particle size distribution were studied. After that, its effect on the hydration kinetics of cement, and the workability, strength development, pore structure, durability of concrete was explored. The results showed that the hydration of cement can be stimulated more dramatically by C-S-H@FA when compared with C-S-H, as well as the strength development of concrete. Besides, the addition of C-S-H@FA can refine the pores in concrete, and make concrete more compact than incorporating C-S-H. Furthermore, when C-S-H was replaced by C-S-H@FA, the carbonation resistance and drying shrinkage resistance of concrete was improved. Therefore, it can be concluded that the C-S-H grown in situ on FA has better dispersibility than C-S-H in concrete, improving the comprehensive properties of concrete more effectively.
研究领域:
材料科学
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土木工程
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DOI
高影响因子
ACS Applied Nano Materials
·
2024
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IF 5.3
Yuting Li,Jiaming Song,Xin Zhao,Bingda Li,Zhuo Wang,Juanjuan Yang,Guoshuai Ban,Feng Teng,Jialong Ma,Chaoying Meng,Honggang Ye,Guangde Chen,Zhonghua Dai,Yu Cong
With increasing environmental pollution, the utilization of green techniques, such as photocatalysis, is required to degrade harmful sources without secondary pollution. In this study, we synthesized an efficient photocatalyst, i.e., a h-BN/BiPO4 heterostructure modified by Ag nanoparticles at the interface (Ag/BN/BPO) by photodeposition and a hydrothermal method, and investigated photocatalytic degradation performance for rhodamine B dye (RhB). It was found that 95% of RhB was removed by Ag/BN/BPO (optimal ratio) after 60 min of light exposure. Compared to BiPO4 and BN/BiPO4, the removal efficiency was improved by 50 and 30%, respectively. The high photocatalytic degradation activity of Ag/BN/BPO could be possibly attributed to the synergistic effect of the improved separation efficiency of electron–hole pairs by the special heterostructure design and the increased adsorption capacity due to the large specific surface area of the layered h-BN. This study provided a possible route for the development of highly efficient photocatalysts for the degradation of organic pollutants.
研究领域:
环境科学
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材料科学
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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）