MOLECULES
·
2017
·Vol. 22
·期 11
·1943
·
IF 2.861
Xiaojia Li,Mingming Zou,Yang Wang
Highly crystalline mesoporous anatase TiO2nanospheres with high surface area (higher than P25 and anatase TiO2) are prepared by a soft-template method. Despite the high specific surface area, these samples have three times lower equilibrium adsorption (<2%) than Degussa P25. The rate constant of the mesoporous anatase TiO2(0.024 min−1) reported here is 364% higher than that of P25 (0.0066 min−1), for the same catalytic loading. The results of oxidation-extraction photometry using several reactive oxygen species (ROS) scavengers indicated that mesoporous anatase TiO2generates more ROS than P25 under UV-light irradiation. This significant improvement in the photocatalytic performance of mesoporous spherical TiO2arises from the following synergistic effects in the reported sample: (i) high surface area; (ii) improved crystallinity; (iii) narrow pore wall thicknesses (ensuring the rapid migration of photogenerated carriers to the surface of the material); and (iv) greater ROS generation under UV-light.Keywords:mesoporous anatase TiO2;high surface area;photocatalytic
研究领域:
材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
RARE METALS
·
2018
·Vol. 38
·期 1
·1-13
·
IF 1.5
Liu Qi,Wang Wen-Qiang,Yang Yue,Liu Xue-Gang,Xu Sheng-Ming
Aluminum recovery is a key issue for the overall recycling of valuable metals from spent catalysts. This paper focuses on the recovery and regeneration of alumina with high additional value from the spent hydrodesulfurization catalyst CoMo/Al 2 O 3 . The results indicate that 98.13% alumina is successfully leached from the treated spent catalysts by an alkaline leaching process under the conditions of 5 mol·L −1 sodium hydroxide, a liquid/solid ratio of 20 ml·g −1 , a temperature of 160 °C and a reaction time of 4 h. In the leaching residue, no difficult leaching compound is found and cobalt and nickel are enriched, both of which are conducive to the subsequent metal recovery step. The reaction order of aluminum leaching is 0.99. This reaction fits well with the interfacial chemical reaction model, and its apparent activation energy is calculated as 45.50 kJ·mol −1 . Subsequently, γ-Al 2 O 3 with a high specific surface area of 278.3 m 2 ·g −1 , a mean size of 2.2 μm and an average pore size of 3.10 nm is then regenerated from the lixivium, indicating its suitability for use as a catalyst carrier. The recovery and regeneration of alumina from spent catalysts can not only significantly contribute to the total recycling of such hazardous spent catalysts but also provide a new approach for the preparation of γ-Al 2 O 3 with a high specific surface area using spent catalysts as the aluminum sources.
研究领域:
化学工程
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材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
RARE METALS
·
2022
·Vol. 41
·期 11
·3684-3693
·
IF 6.318
Zhang Xi-Yue,Zhang Le,Zhou Tian-Yuan,Sun Bing-Heng,Wei Shuai,Cao Yi-Fei,Liu Ming-Yuan,Sang Peng-Fei,Wei Cong,Chen Wei,Chen Hao
High specific surface of (α/γ)-Al 2 O 3 powder is essential for its applications in adsorbents, catalysts or ceramic raw materials. However, the phase transformation from precursor to oxide powder inevitably experiences the high-temperature calcination process which coarsens or agglomerates the particles, and then loses the high dispersity and activity. In this study, a novel spray precipitation operation was employed to synthesize the nanostructured ammonium aluminum carbonate hydroxide (AACH) and boehmite (γ-AlOOH) precursors in single precipitation method just depending on pH values. The high specific surface area (250.34 m 2 ·g −1 ) and high pore volume (0.96 ml·g −1 ) of as-prepared γ-Al 2 O 3 powder were inherited from fresh sea-urchin-like AACH precursor prepared at pH = 9. The sequential hydrolysis effect accelerated the unstable AACH precipitate to evolve into nearly spherical γ-AlOOH at a lower pH = 5. The special nano-clusters of AACH effectively reduced the phase transformation temperature of γ-Al 2 O 3 . In addition, the precipitation, nucleation and growth mechanisms and phase transformation sequences from different precursors to oxide powders were further proposed. Therefore, this work shows how pH value driving spray precipitation leads to a provisional change in morphology of precursors, but also to a permanent change in dispersion state of powders. It significantly affects the catalysis properties of Al 2 O 3 powders and its performance in adsorbent or electronic ceramics. These results are crucial for advancing Al 2 O 3 -supported technologies. Graphical abstract
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS LETTERS
·
2014
·
IF 2.269
Bowei Chen,Yin Gao,Yutie Bi,Xuan Luo,Lin Zhang
This was a fascinating study which introduced a brand new method to synthesize carbon aerogels from polyacrylic acid by using CO as a reducing agent, during which, with the help of metal salt, polyacrylic acid ensured the development of the aerogels׳ properties of huge surface area and low density. Required supercritical drying and thermal treatment were adopted to generate high surface area (1560 m 2 /g). According to the results demonstrated by the X-ray photoelectron spectroscopy (XPS) and Energy-dispersive spectrometry (EDS), the sample was an inorganically porous material, with a density of approximately 20 mg/cm 3 . In summary, the attractive properties of the carbon aerogel expounded the potential application possibility of their nanostructures on electrode.
研究领域:
材料科学
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化学工程
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2017
·
IF 3.582
Shuang Ji,Zhourong Xiao,Haocui Zhang,Ling Li,Guozhu Li,Li Wang,Guozhu Liu
A high surface area (HSA) Ce 0.75 Zr 0.25 O 2 (CZ) support was synthesized by hydrothermal synthesis method with assistance of surfactant (cetyltrimethyl ammonium bromide , CTAB), and then 2.0 wt% Ru was impregnated on it to obtain a steam reforming catalyst for n-dodecane. The surface area of Ru/HSA-CZ catalyst is 107.6 m 2 g −1 , which is ca. three times higher than that prepared through the sol-gel (sg) method (34.3 m 2 g −1 , Ru/CZ-sg) and ca. 40% higher than that without CTAB (76.7 m 2 g −1 , Ru/CZ-wo). Catalytic steam reforming of n-dodecane, shows the completely conversion of n-dodecane over Ru/HSA-CZ and slightly drops about 6% (650 °C, LHSV = 12 mL/g h, S/C = 4, time on stream = 7 h) while 81% and 70% were observed for the Ru/CZ-wo and Ru/CZ-sg but with twice (or triple) deactivation rates. The possible reason for observed better performance of Ru/HSA-CZ should be attributed to the high metal dispersion of Ru over HSA-CZ, and the favorable Ru-support interaction as evidenced by H 2 -Temperature programmed reduction (H 2 -TPR), and high redox ability of high surface area Ce 0.75 Zr 0.25 O 2 support thanks to high Ce 3+ content. Further steam reforming of n-dodecane over Ru/HSA-CZ at higher LHSV (750 °C, LHSV = 36 mL/g h, S/C = 4) exhibits completed conversion and without significant deactivation.
研究领域:
化学工程
·
催化材料
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Shijiao Zhao,Jing Song,Rui Xu,Lei Nie,Jingtao Ma,Changsheng Deng,Xing Cheng,Xingyu Zhao,Shaochang Hao,Jianjun Li
In this study, zirconium nitride nanopowders with a high specific surface area were synthesized by carbothermal nitridation with fructose as a double-function additive. The precursor was prepared by an internal gelation process. The first function of fructose was to act as an organic carbon source for the nitridation reaction to decrease the apparent activation energy . The second function of fructose was to act as a microstructural controller of products to obtain a high specific surface area of 315.7 m 2 /g. The effects of temperature on the phase composition, chemical elements, morphology and specific surface area were investigated. The microstructure development upon heating was illustrated and the relationship between the structure evolution and variation in the specific surface area was elucidated. This method with fructose as a water-soluble organic additive could be expanded to prepare transition metal nitrides with a high specific surface area.
研究领域:
材料科学
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纳米技术
✓ 已验证
DOI
高影响因子
Materials
·
2023
·Vol. 16
·期 8
·3171
·
IF 3.4
Hongbin Wang,Beirong Ye,Chen Li,Tao Tang,Sipu Li,Shaojun Shi,Chunyang Wu,Yongqi Zhang
Water electrolysis as an important and facile strategy to generate hydrogen has attracted great attention, and efficient electrocatalysts play a key role in hydrogen evolution reaction (HER). Herein, vertical graphene (VG)-supported ultrafine NiMo alloy nanoparticles (NiMo@VG@CC) were fabricated successfully via electro-depositing as efficient self-supported electrocatalysts for HER. The introduction of metal Mo optimized the catalytic activity of transition metal Ni. In addition, VG arrays as the three-dimensional (3D) conductive scaffold not only ensured high electron conductivity and robust structural stability, but also endowed the self-supported electrode large specific surface area and exposed more active sites. With the synergistic effect between NiMo alloys and VG, the optimized NiMo@VG@CC electrode exhibited a low overpotential of 70.95 mV at 10 mA cm−2and a remarkable stable performance over 24 h. This research is anticipated to offer a powerful strategy for the fabrication of high-performance hydrogen evolution catalysts.Keywords:vertical graphene;NiMo alloy;high surface area;hydrogen evolution reaction;electrodeposition
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2016
·Vol. 16
·期 1
·892-897
·
IF 1.338
Tripathi Pranav K.,Gan Lihua,Liu Mingxian
In this work, we have synthesized high surface area and large pore volume carbon nanoparticles (CNP) by a simple and easy sol–gel approach. The sol was prepared by mixing Pluronic F127 and phloroglucinol-terephthalaldehyde in acidic ethanol solution and the gel was formed after
the vacuum removal of ethanol. In the sol–gel process, hydrophobic segments of Pluronic F127 forms enhanced hydrogen bonding with trihydroxyl groups of phloroglucinol. A polymeric network of carbon precursor was also prepared by making the interconnectivity between four phloroglucinol
and one terephthalaldehyde molecules. After thermal polymerization and carbonization of the gel, the CNP had a very high surface area (1441 m2 g−1) and large pore volume (1.7 cm3 g−1) with narrow micropore (1.0 nm) and mesopore (2.3 nm) diameters. The mesopore
was developed due to the enhanced hydrogen bonding between Pluronic F127 and phloroglucinol, while the micropores were generated due to hydrocarbon polymeric network of phloroglucinol-terephthalaldehyde. The CNP had a size about ca. 20 nm. The CNP were applied for the removal of the highly
hazardous water pollutant malachite green (MG) and achieved a very high adsorption capacity (1892 mg g−1). The commercials powder activated carbon (PAC) was also applied for the removal of MG and achieved an adsorption capacity of PAC was 1390 mg g−1. It believes
that shape and size of CNP and PAC played an important role in the adsorptive removal of MG.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2024
·
IF 3.2
Qian Zhang,Jun Li,Tian-Jiao Yue,Na Li,Yu-Qin Jiang,Hai-Ming Guo
Four hyper-cross-linked polymers were synthesized by linking electron-rich monomers with an electron-rich cross-linker via the Friedel–Crafts reaction. Among these polymers, P4 , which was constructed with decaalkyne pillar[5]arene and bibenzyl chloride, adsorbed iodine vapor with a capacity of 3.930 g g −1 , outperforming most supramolecular macrocycle-based porous polymers . The pillar[5]arene macrocycle contributed various types of adsorption sites, including aromatic rings , diynes, and oxygen atoms. The abundance of effective adsorption sites and the high specific surface area (1615.5 m 2 g −1 ) were responsible for the excellent adsorption capacity of P4 . Because these polymers are easy to synthesize and regenerate and can be mass produced, they are promising candidates for large-scale applications.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
Catalysts
·
2021
·Vol. 11
·期 5
·572
·
IF 4.146
Zhou Zhou,Jing Wang,Chul Gyu Jhun
The preparation of high specific area (86.5 m2/g) ZnO nanospheres with good photocatalytic efficiency via a simple, green and efficient mechanochemical method was reported in this work. The products were characterized by XRD, SEM, TEM, BET and UV–Vis. The ball milling parameters were improved to reduce the agglomeration hazard during the ball milling process, and the specific surface area, band gap and photocatalytic efficiency were investigated in relation to ball milling time. Our study developed the opportunity for the low-cost and facile synthesis of a high specific surface area photocatalyst on a large scale for future industrial applications.Keywords:ZnO;high specific area;mechanochemistry;nanospheres;photocatalytic;RhB
研究领域:
材料科学
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化学工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2020
·
IF 2.87
Jianbo Zhao,Jun Wei,Di Cai,Hui Cao,Tianwei Tan
A poly(amino acid)-based approach for scalable synthesis of micro-/mesoporous carbon (PC) with high specific surface area and narrow distribution of micro- and mesopores is presented. Using cross-linked poly aspartic acid as a precursor, PC was obtained by in situ one-step carbonization without the activating agent. The resulting PC had an ultrahigh adsorption capacity for H2 (4.43 wt %) and CH4 (4.49 mmol g–1). This novel method could significantly decrease the wastewater hazards caused by washout of the considerable amount of the activating agent. The PC showed promising application in gas adsorption and storage.
研究领域:
材料科学
·
能源存储
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
DIAMOND AND RELATED MATERIALS
·
2021
·
IF 3.315
Qingsong Ji,Haichao Li
High surface area carbons materials were prepared by a process of carbonization followed by chemical activation of biomass resources of chitin . The characterization of the carbon material was done using Scanning Electron Microscope (SEM), N 2 adsorption/desorption, Fourier Transform Infrared Spectroscopy (FTIR), Elemental Analyzer and X-ray Photoelectron Spectroscopy (XPS). The absorption of the carbon material was studied as kinetically and thermodynamically for the removal of cationic dye, Crystal Violet (CV) from wastewater. The results showed that KOH-activated samples with high BET surface area (2186.3 m 2 g −1 ) and total pore volume (0.9815 cm 3 /g). In some case, the samples are suitable for CV removal for a large range of pH and the removal efficiency is close to 100%. The adsorption process was found to follow pseudo-second order kinetics and Langmuir models. In addition, between 25 and 45 °C, the monolayer maximum adsorption capacity significantly increased and the maximum adsorption capacity was found to be 331.406, 399.943 and 420.068 mg g −1 at 25 °C, 35 °C and 45 °C, respectively.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）