CELLULOSE
·
2016
·Vol. 23
·期 2
·1325-1334
·
IF 3.195
Chen Mingjie,Zhang Xueqin,Zhang Aiping,Liu Chuanfu,Sun Runcang
Lignocellulosic biomass aerogels with relatively high Brunauer–Emmett–Teller (BET) surface area and pore volume were prepared directly from bagasse solutions in the present study. Bagasse was dissolved in DMSO/LiCl, treated with cyclic freezing-thawing processes, and regenerated with water. The resulted bagasse hydrogels were solvent-exchanged to t-butanol and subjected to freeze-drying to obtain the lignocellulosic aerogels. The structure of the aerogels was studied with FTIR, nitrogen absorption, SEM, and XRD. The results showed that the aerogels had sheet-like skeletons interconnected with one another to form three-dimensional networks. The highest BET surface area and total pore volume of the aerogels were 185 m 2 /g and 0.46 cm 3 /g, respectively. By adjusting the concentration of bagasse solution in DMSO/LiCl, the structure of the aerogels could be controlled to some extent.
研究领域:
材料科学
·
生物质能
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Chun-Feng Xue,Xiao-Qing Li,Jian-Qiang Du,Li-Feng Wang,Xiao-Hong Li,Wen-Jun Yan,Xiao-Gang Hao
To enhance energy density of water-based electrochemical supercapacitor , a highly self-graphenized bicohar with huge pore volume is pyrolyzed from the biomass Ulva lactuca (UL) pre-boiled in Mg(CH 3 COO) 2 solution. During the pyrolysis process , the MgO converted from the Mg(CH 3 COO) 2 re-crystallized in the biomass UL inhibits the pore shrinkage and helps to inherit the pristine pore system . The resultant biochar HUB-2.0 exhibits high specific surface area (SSA) of 2296.7 m 2 g −1 and huge pore volume of 4.59 m 3 g −1 . It is also featured with moderate self-graphenization and heteroatoms self-doped surface in the connected pore system inherited from the precursor. It achieves a specific capacitance of 445.0 F g −1 at 0.5 A g −1 in the three-electrode system with the electrolyte 1.0 M H 2 SO 4 . A superior energy density of 27.17 Wh kg −1 is also calculated at a power density of 222.8 W kg −1 in the two-electrode system with the neutral electrolyte Na 2 SO 4 . The work provides a fast and efficient method to prepare the biochar with balanced properties to achieve superior electrochemical supercapacitor performance, especially for high energy density.
研究领域:
材料科学
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能源存储
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED POWDER TECHNOLOGY
·
2024
·
IF 4.2
Hu Wen,Yuxin Li,Haitao Yin,Wei Wang,Zhengchao Jin,Shunyu Han,Nanzhe Jiang
The conversion of natural clay to crystalline zeolites has been the subject of considerable interest from both academic and industrial circles. We present an effective strategy for converting kaolin to ZSM-5 zeolite, addressing the issue of reduced mesopore formation in conventional nano-ZSM-5 aggregates due to close-packing. This strategy utilizes kaolin as the sole source of silicon and aluminum, and by decoupling the nucleation and growth of ZSM-5 crystals, loosely stacked nano-H-ZSM-5 aggregates with high crystallinity crystals can be synthesized in a solid-like system by employing a tiny amount of TPAOH (TPAOH/SiO 2 = 0.064). The resulting nano-H-ZSM-5 aggregates exhibited high specific surface area (405.66 m 2 /g), high mesopore volume (0.64 cm 3 /g), and superior catalytic activity. This strategy offers a novel approach to the cost-effective synthesis of nano-H-ZSM-5 aggregates suitable for industrial applications.
研究领域:
化学工程
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材料科学
·
催化反应
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Xing-Zhe Guo,Shuai-Shuai Han,Ji-Min Yang,Xiao-Meng Wang,Shui-Sheng Chen,Shuai Quan
We herein report that the morphology, size, and surface charge status of MIL-100(Fe) micro/nanoparticles can be tailored by adding a coordination modulator (HF or tetramethylammonium hydroxide) to the reaction system. Interestingly, the adsorption capacities of low-crystallinity MIL-100(Fe) and MIL-100(Fe)-TMA toward Congo red (CR) and acid chrome blue K (AC) were found to be significantly larger than that of the high-crystallinity MIL-100(Fe)-HF adsorbent, whereas there was little difference in the adsorption capacities of the three MIL-100(Fe) toward methyl orange (MO) and methylene blue (MB). The adsorption uptake of MIL-100-(Fe)-TMA toward the anionic dyes (CR, AC, and MO) was found to be highest, whereas the adsorption uptake of MIL-100(Fe) toward the cationic dye (MB) was the highest owing to different adsorption mechanisms. This adsorption behavior could be rationalized based on the morphological characteristics and crystal structure defects, zeta potential, and pore volume of MIL-100(Fe) and the adsorption characteristics and molecular structure of the dye. It was revealed that the adsorption performance of MIL-100(Fe) micro/nanoparticles is governed by the synergistic interplay between electrostatic, hydrophobic, and π–π stacking interactions, pore volume, crystal structure defects, and steric hindrance of the adsorbent.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2018
·
IF 4.513
Wei Jiang,Lei Dong,Huan Li,Hao Jia,Linhua Zhu,Wenshuai Zhu,Huaming Li
Magnetic core-shell structure microspheres with tunable pore volumes were synthesized and used to immobilize a polyoxometalate-based ionic liquid for oxidative desulfurization of diesel fuel. The as-prepared catalysts were characterized by transmission electron microscopy , Fourier transform infrared spectroscopy , Raman spectroscopy , and nitrogen adsorption–desorption. The results showed that the small catalyst had a large pore volume and the large catalyst had a small pore volume, while their BET surface areas and pore sizes were almost the same. Compared with the large catalyst, the small catalyst showed better catalytic activity, probably due to the promotion of its large pore volume. Under the optimal reaction conditions, the removal of 4,6-dimethyldibenzothiophene could reach 95.4% with a residual sulfur content of 9.2 mg kg −1 . After the reaction, the catalyst could be separated by a magnetic field and recycled at least 7 times with little decrease in desulfurization efficiency.
研究领域:
化学工程
·
催化材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POROUS MATERIALS
·
2023
·Vol. 30
·期 4
·1295-1302
·
IF 2.6
Wang Xu,Xu Gen,Zhou Zhiwei,Qin Xiaojuan,Su Yuansha,Zhang Xianbin,Wu Wenliang
New Cu 2 O@TiO 2 core-shell microspheres were successfully prepared for the first time in this paper. The XRD, N 2 adsorption-desorption, SEM, TEM, EDX and XPS characterizations were utilized to investigate the physical and chemical properties. The liquid phase oxidation of naphthalene was also carried out to test their catalytic performance. The characterization results indicating that the Cu 2 O microspheres were firstly formed by hydrothermal treatment and the rutile TiO 2 coating on the surface would be formed by the hydrolysis of tetrabutyl titanate. The Cu 2 O@TiO 2 - 5.0 catalyst with the molar ratio of copper to titanium species as high as 5.0 has the largest surface area and maximum pore volume resulting from the integrated microspheres with rougher surface thickness of about 6.3 nm, and it showed higher catalytic performance in the liquid phase oxidation of naphthalene. Naphthalene conversion of 43.2%, 1, 4-naphthoquinone selectivity of 26.7% and phthalic anhydride selectivity of 53.4% can be obtained, and it only slightly decreased even after repeated use for 5 times. The method would provide a valuable theoretic reference for the hindrance of Cu 2 O rapid deactivation and the industrial application of the naphthalene oxidation to produce high valuable chemicals.
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
Biomass Conversion and Biorefinery
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2023
·
IF 4
Chen Jun Xiu,Li Jin Hao,Bao Agula
The development of porous carbon materials with high CO 2 adsorption capacity is crucial for addressing the current issues of industrial air pollution and global warming. In this study, B/N codoped porous carbon materials were prepared via a combined strategy involving the use of a self-sacrificing template in conjunction with potassium hydroxide activation; moreover, g-C 3 N 4 was used as the N source and boric acid was used as the B source. The pore structure and surface chemistry were investigated in detail using different techniques such as X-ray diffraction, scanning electron microscopy, N 2 adsorption and desorption, transmission electron microscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy. Results showed that the prepared material exhibited the highest specific surface area (2278 m 2 /g) and pore volume (1.00 cm 3 /g) when the ratio of B/N sources was 1:0.5; moreover, its CO 2 adsorption value (3.26 mmol/g) was higher than those of most codoped adsorbents.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Coatings
·
2024
·Vol. 14
·期 4
·383
·
IF 2.9
Chunling Xin,Shufen Hou,Lei Yu,Xiaojing Zhou,Yunkai Fu,Xiaoteng Yang,Weiwei Sun,Fan Yang,Xia Wang,Lili Liu
Yellow nanorod Mg-MOF-74 was obtained through a solvothermal synthesis method. The XRD, N2adsorption–desorption isotherms, SEM, and TGA results suggest that the particle size of Mg-MOF-74 reaches 400 nm after the introduction of sodium acetate in the precursor of Mg-MOF-74. Furthermore, the morphology of Mg-MOF-74 changed from cauliflower- to rod-shaped particles. At the same time, the BET specific surface area and pore volume of Mg-MOF-74 also increased a lot. Then, the CO2dynamic adsorption capacity of Mg-MOF-74 was measured with a self-made fixed bed at 30 °C and a 0.1 bar CO2partial pressure. The results show that the CO2adsorption capacity of Mg-MOF-74-N2 reaches 3.67 mmol/g, and its CO2adsorption capacity remains unchanged after 10 CO2adsorption–desorption cycles.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2016
·
IF 3.349
Jing Xu,Abdul-Rauf Ibrahim,Xiaohui Hu,Yanzhen Hong,Yuzhong Su,Hongtao Wang,Jun Li
Alumina was synthesized from Al(NO 3 ) 3 , AlCl 3 and Al 3 (SO 4 ) 2 with NaOH, and from NaAlO 2 with HNO 3 by addition of acidic solution to alkaline solution with a syringe pump. The as-produced Al 2 O 3 precursors were supercritically dried and calcined at 500 °C to obtain mesoporous γ-alumina material. Results showed that all the inorganic aluminum salts could be used to synthesize high pore volume γ-alumina by controlling the precursor addition rate at room temperature and supercritical CO 2 drying. However, the γ-alumina with the largest pore volume (5.4 cm 3 /g), BET surface area (423.7 m 2 /g) and pore size (37.8 nm) was obtained using Al(NO 3 ) 3 and NaOH. This γ-alumina was further used as a support for Fe-based catalyst with hydrogen peroxide to produce hydroquinone and catechol in the phenol hydroxylation reaction in 30 min at 80 °C. The conversion of phenol was 53.4% whereas the selectivity to dihydroxybenzenes-DHBs (hydroquinone-HQ and catechol-CAT) was as high as 96.2%, revealing that the larger pore volume takes effect in the γ-alumina as support for the Fe-based catalyst in the hydroxylation reaction, and that the γ-alumina may be a good candidate as the support for other important catalysts such as those used in the petroleum refining industry.
研究领域:
化学工程
·
催化材料
✓ 已验证
DOI
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
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环境科学
·
化学工程
✓ 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
Surfaces and Interfaces
·
2021
·
IF 4.837
Xiao-Ting Zhen,Ya-Ling Yu,Min-Zhen Shi,Si-Chen Zhu,Tian-Ci Yan,Zi-Xuan Yue,Yu-Xin Gu,Hui Zheng,Jun Cao
The Hawthorn kernel activated carbon (HKAC), acquired from food waste (hawthorn kernel) by a two-step method including carbonization operation and thermally activating potassium hydroxide process, was prepared. Morphological integrity and crystalline state of the HKAC were characterized by scanning electron microscopye and X-ray diffraction. Structural feature of the HKAC was investigated by the Brunauer–Emmett–Teller method, Fourier transform infrared spectroscopy , Raman spectroscopy together with zeta potential . The HKAC contained a specific surface area of 1269.92 m 2 /g and pore volume of 0.67 cm 3 /g. The optimized adsorption conditions were to use HKAC with a carbonization temperature of 550 °C were at a concentration of 0.6 g/L for adsorption in a solution with a temperature of 60 °C and a pH of 6.0. The kinetic studies proved that the pseudo-second-order model fitted experimental data best with the high correlation coefficient values of 0.9968–0.9993. Besides, experimental results revealed that Langmuir isotherm model gave the best fit among the studied isotherm models with a maximum adsorption capacity of 100.00 mg/g, the experimental results revealed that the Langmuir isotherm model was more consistent than the Freundlich isotherm model with a maximum adsorption capacity of 100.00 mg/g, and the adsorption of fungicides onto HKAC was endothermic spontaneous process. Moreover, it was confirmed in tap water and Dendrobium that the removal rate of the six fungicides remained at 86.3% to 96.2% after five cycles of HKAC even in a complex matrix. The aforesaid satisfying experimental results proved that HKAC was a cost-effective and green adsorbent for removing water and plant contaminated by fungicides.
研究领域:
环境科学
·
农业科学
✓ 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）