MICROPOROUS AND MESOPOROUS MATERIALS
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2016
·
IF 3.349
Shengxue Wang,Wei Li,Song Wang,Zhaohui Chen
Mesoporous La 2 Zr 2 O 7 was successfully prepared by combining epoxide-mediated sol-gel process and solvothermal treatment. The gelation was controlled by addition of propylene oxide to the ethanol solutions of nitrates. Solvothermal treatment was adopt to strengthen the mesopore structure and inhibit the collapse of pores during abiment pressure drying, and it obviously increased surface area. The as-synthesized mesoporous La 2 Zr 2 O 7 showed nanoparticles assembling and mesoporous structure, and the nanoparticles has a surface area of 302.9 m 2 /g and an average pore size of 22.2 nm. The mesoporous La 2 Zr 2 O 7 has an amorphous structure with some organic component. After heat treatment, the inorganic transformation occurred and it crystallized into pyrochlore structure. With increase of heat treatment temperature, the particles of mesoporous La 2 Zr 2 O 7 become larger for the sintering of nanocrystalline La 2 Zr 2 O 7 . The surface area can retain at 92.7 m 2 /g after 600 °C, and decreased to 12.4 m 2 /g after 1200 °C for 3 h. This facile route provides a low-cost strategy for the preparation of mesoporous metal oxide with high surface area.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 19
·15485-15491
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IF 3.289
Yan Zheng,Zhixiang Jiang,Ping Yang
Carambola-like TiO2 consisting of nanosheets with exposed {001} facets was synthesized via a one-step solvothermal method for the first time. The carambola-like TiO2 was characterized by X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, and Brunauer–Emmett–Teller nitrogen adsorption isotherm experiments. The formation mechanism of the carambola-like TiO2 is discussed by investigating the effect of reaction time, temperature and the volume of hydrofluoric acid. The results from different growth stages demonstrated that the formation of carambola-like TiO2 included alcoholysis of precursor to nucleation, nuclei growth, dissolution–recrystallization growth and further growth. Reaction temperatures affected the morphologies and surface areas of carambola-like TiO2 samples. The photocatalytic performances of samples prepared at different temperatures were tested. The carambola-like TiO2 sample prepared at 160 °C exhibited the best photocatalytic activity. Such enhanced photocatalytic performance is ascribed to the large surface area and the exposed {001} facets with high activity.
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
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2024
·
IF 4.8
Van-Hien Pham,Bich-Ngoc Duong,Duy-Khoi Nguyen,Loc Ton-That,N.T. Dang,D. Thanh Khan,Ngoc-Quyen Tran,Ngoc Duy Nguyen,Van-Phuc Dinh
The synthesis of zeolite ETS-10 is strongly influenced by factors such as pH, the amount of the structure-directing agent, hydrothermal temperature and duration, which collectively affect the material’s morphology and structure. This study thoroughly investigates the effects of these parameters on the synthesis of ETS-10 zeolite using TiCl 3 and a waterglass solution. Characterization of the materials was performed through X-ray diffraction (XRD), scanning electron microscopy (SEM), infrared spectroscopy (FT-IR), and nitrogen isotherm adsorption-desorption at 77 K (BET-BJH) techniques. The findings indicate that pH and the structure-directing agent significantly influenced the phase composition , while hydrothermal temperature predominantly determined the crystallization rate of ETS-10. Optimal synthesis conditions were established at an initial pH of 11, employing 0.3 g of the structure-directing agent and conducting hydrothermal crystallization at 230 °C for 24 h. Under these conditions, the ETS-10 zeolite produced exhibited a high surface area of 300.1 m 2 /g, making it effective in removing Pb 2+ ions from solution. In particular, when tested under optimal conditions (pH 5) for 600 min, Pb (II) adsorption by ETS-10 reached a maximum uptake capacity of 956.19 mg/g, as determined by the Langmuir isotherm model. This capacity surpasses that of as-synthesized ETS-10 prepared from alternative Ti sources and other materials used in previous studies on Pb(II) adsorption.
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
CHEMICAL PHYSICS
·
2021
·
IF 2.348
Xingchang Tang,Yongwei Luo,Zhijian Zhang,Wanwu Ding,Dexue Liu,Jingchuan Wang,Li Guo,Ming Wen
The high surface areas and tunable properties of Zr-based MOFs make them as attractive materials for gas capture, storage, and separation. In this work, UiO-66, one kinds of Zr-based MOFs, functionalized by single or binary –NO 2 and –NH 2 groups are synthesized. Water adsorption ability and hydrophilicity of UiO-66 and functionalized UiO-66-X were investigated. It is found that surface area of UiO-66 is decreased after introducing functional groups, while hydrophilicity of UiO-66 increased after functionalized with –NO 2 and –NH 2 . Therefore, after balance the effects of surface area and hydrophilicity, UiO-66-NH 2 shows the best water adsorption propriety.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Russian Journal of Physical Chemistry A
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2018
·Vol. 92
·期 7
·1274-1278
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IF 0.549
Xiaomeng Liu,Lu Shaoxiang,Xu Hanghui,Ren Lili
Abstract Molybdenum phosphide (MoP), modified by polyethylene glycol (PEG) and citric acid (CA), exhibited 2 to 3 times superior activity than the MoP modified by CA alone. And the optimal activity temperature was reduced from 500 to 450 o C. The catalyst was fully characterized by a variety of techniques including X-ray diffraction (XRD), N 2 adsorption-desorption isotherm, scanning electron microscopy (SEM), transmission electron microscopy (TEM). The results showed that the addition of PEG and CA increased the surface area of MoP and decreased the particle size of MoP. Furthermore, the reaction mechanism also has been discussed by combining the activity data and characterization results.
研究领域:
催化化学
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材料科学
✓ 已验证
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
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2018
·
IF 2.21
Xiaoying Lu,Fang Deng,Min Liu,Xubiao Luo,Aijie Wang
CuInS 2 semiconductor were synthesized by regulating Cu/In molar ratio via a hot solvent method. Different Cu/In molar ratio in reaction system had significant influence on the BET surface area , charge separation and photocatalytic activity of CuInS 2 . The CuInS 2 with optimal Cu/In ratio of 1:1.5 exhibits the most efficient charge separation and transfer, leading to the highest photocatalytic activity . The mineralization efficiency of pharmaceutical wastewater by CuInS 2 (Cu:In = 1:1.5) was 67.5% in 6 h, and CuInS 2 (Cu:In = 1:1.5) exhibited high stability, indicating that CuInS 2 has a promising prospect in real pharmaceutical wastewater treatment .
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
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2020
·
IF 4.966
Wang Zhan,Zhaozhan Gu,Juncheng Jiang,Le Chen
In this study, three kinds of graphene were used as fire retardant fillers to improve the properties of waterborne intumescent fire resistive coatings. The surface area of graphene was measured by nitrogen adsorption-desorption method. The influences of surface area of graphene on fire resistance, thermal stability, smoke suppression and water resistance of the coatings were studied. SEM, FTIR, XRD and XPS were used to investigated the structure and composition of the inorganic expansion layer. The spectra of FTIR and XRD demonstrated the inorganic expansion layer had the same chemical composition. The XPS result proved that graphene could enhance anti-oxidation of the inorganic expansion layer. The SEM images showed that the number of holes and cracks decreased with the addition of graphene. The results demonstrated that the graphene with surface area of 212 m 2 /g significantly enhanced the fire resistance, thermal stability, smoke suppression, water resistance of the fire resistive coatings effectively.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2010
·Vol. 211
·期 6
·698-705
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IF 2.57
Shaozhong Zeng,Limin Guo,Fangming Cui,Zhe Gao,Jian Zhou,Jianlin Shi
Crystalline-branched supramolecular structures (CBSSs) with surface area (Brunauer-Emmett-Teller model) up to 350 m 2 · g −1 were synthesized by in situ self-assembly of the zigzag polyimide macromolecules under solvent-thermal condition. The pore formation mechanism in these polyimides was supposed to be different from any microporous polymers ever reported. Although this family of porous polyimide does not belong to covalent organic frameworks (COFs), their high degree of crystallinity shows the possibilities that the dynamic covalent chemistry for synthesizing COFs could be extended from easily hydrolyzable B O bond to a more stable imido bond. Therefore, we believe that these CBSSs could be useful in many applications, e.g., catalyst carriers and low-K materials.
研究领域:
材料科学
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化学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 12
·6542-6548
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IF 7.443
Shaolei Wang,Liangxiao Tan,Chengxin Zhang,Irshad Hussain,Bien Tan
Two kinds of POSS-based organic–inorganic hybrid porous materials have been synthesized via Friedel–Crafts and Scholl coupling reactions, for the first time, using low-cost building blocks i.e., octaphenylsilsesquioxanes and simple knitting approaches to obtain high Brunauer–Emmett–Teller (BET) surface area porous polyhedral oligomeric silsesquioxane (POSS)-based hybrid materials. N2 sorption isotherms of the polymers show that both these materials are predominantly microporous and mesoporous with BET surface areas of 795 m2 g−1 for the polymer of octaphenylsilsesquioxanes-1 (POPS-1) and 472 m2 g−1 for the polymer of octaphenylsilsesquioxanes-2 (POPS-2). Moreover, POPS-1 can reversibly adsorb 9.73 wt% CO2 (1 bar and 273 K) and 0.89 wt% H2 (1.13 bar and 77 K), and POPS-2 shows moderate gas uptake with 8.12 wt% CO2 (1 bar and 273 K) and 0.64 wt% H2 (1.13 bar and 77 K). In addition, the structural integrity of POSS based building blocks was completely preserved under relatively strong acidic conditions.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2017
·
IF 4.9
Jing Yang,Hao Li,Di Zhang,Min Wu,Bo Pan
Nitrate cycling is essential in sustaining soil systems. Excessive application of N-fertilizers and the associated underground water contamination have attracted a great deal of research attention. Sorption is efficient and environmentally friendly in nitrate fixation. A debate was noted in literature regarding whether biochars have potential to fix nitrate through sorption. In this study, biochars produced from different biomasses as well as biomass compositions were chosen as the absorbents to evaluate their potential efficiencies in nitrate fixation. Increased sorption to nitrate was observed for biochars with increased pyrolysis temperature, but the increasing extent varied with biomass. The surface base functional groups and surface charges of biochars could not well explain nitrate sorption. The significant positive correlation between nitrate sorption and biochar surface areas suggested that surface area was the controlling parameter for nitrate sorption. The pre-coating of tannic acid (TA) on biochars decreased but did not completely inhibit nitrate sorption. This observation suggested that nitrate sorption on biochars may be further decreased after their interactions with natural organic matter. Nitrate sorption was compared among various adsorbents, including biochars, soil particles, clay minerals, engineered particles, as well as humic substances . Soil particles generally showed high sorption to nitrate over biochars. This result suggested that biochars investigated in this work may play a limited role in nitrate fixation through sorption after their massive application. Nitrogen fixation through nitrate adsorption on biochars should be carefully evaluated taking into consideration of biochar feedstocks and properties.
研究领域:
环境科学
·
土壤学
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产品关联
DOI
PubMed
高影响因子
Catalysis Science & Technology
·
2025
·
IF 4.2
Xiaohui Wang,Zhuang Li,Peng Zhao,Chao Yao,Jie Meng,Shixiang Zuo,Wei Zhu,Jingwei Liu,Fengqin Wu
Natural manganese ore (NMO) has received extensive attention on account of its inherent stability, abundant reserves, and low cost. The higher specific surface area and abundant active sites are considered crucial for catalytic combustion. However, owing to the limited specific surface area inherent to natural manganese ore, we employed an acid etching activation treatment to enlarge the specific surface area of NMO (from 17.8 m2 g−1 to 48.9 m2 g−1). Herein, we successfully fabricated composite catalysts consisting of activated natural manganese ore (HNMO) and Co3O4 using the ethylene glycol sol–gel method and then evaluated them for the catalytic combustion of ethane. Results showed that the catalytic performance of the composite catalysts for ethane could not be enhanced monotonically by increasing the introduction of Co indiscriminately. Among them, the Co2-HNMO catalyst exhibited a higher specific surface area, increased Mn4+ and Co3+ contents and higher oxygen mobility, which were attributed to the significant interaction between Co3O4 and HNMO. The T90 of the corresponding Co2-HNMO catalyst was 294 °C under a space velocity of 40 000 mL g−1 h−1. This work presents new insights into the design and synthesis of efficient composite catalysts based on natural minerals.
研究领域:
化学工程
·
催化材料科学
✓ 已验证
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2025
·
IF 6.7
Huazangnaowu Bai,Ruiqi Qiao,Fang Xiao,Jiawen Li,Baiyi Zu,Zhenzhen Cai
Due to the severe interference from analogues such as hydrochloric acid, it is of great significance to establish a highly reliable technique to enhance the discrimination ability toward diethyl chlorophosphate (DCP). Here, based on the electrophilicity of DCP, a series of zero-background fluorescence Schiff base materials with different densities of C═N bonds as recognition sites were designed and synthesized by modulating the chain length. It is found that the increase of the C═N bond density and the specific surface area could improve the collision efficiency with DCP, thereby improving the response speed. When the density of C═N bonds is 3.86 × 1021/cm3 and the specific surface area is 128.5 m2/g, DFDBA-POP demonstrated a more superior sensing performance toward the target analyte, including the ability to detect gaseous DCP, a rapid response (1 s), and superior selectivity even in the presence of 15 kinds of interferents including the very similar hydrochloric acid. Moreover, the practicality of DFDBA-POP was further verified by a DFDBA-POP solid-state sensor, which is capable of specifically identifying gaseous DCP. The present nonfluorescent Schiff base materials design and modulation strategy would open up a new gate for the rational design of high-performance fluorescent materials to detect and discriminate trace hazardous substances with similar structures and properties.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）