RSC Advances
·
2018
·Vol. 8
·期 48
·27565-27573
·
IF 2.936
Qian Meng,Peng Du,Bo Wang,Aijun Duan,Chunming Xu,Zhen Zhao,Cong Liu,Di Hu,Yuyang Li,Chengkun Xiao
Zirconium modified mesoporous materials were successfully synthesized by different methods including direct synthesis and post synthesis (grafting and impregnating). Meanwhile, the corresponding catalysts were prepared. A series of techniques, including small-angle X-ray scattering (SAXS), transmission electron microscopy (TEM) and pyridine adsorption Fourier-transform infrared (Py-IR), were used to characterize the properties of supports and catalysts. The results of SASX and TEM characterization proved that all the modified materials retained the well-ordered mesoporous structure from the FDU-12 material. N2 adsorption–desorption results showed that the Zr-FDU-12 material obtained by direct synthesis (Zr-in-F) possessed higher specific surface area (709 m2 g−1), pore volume (0.65 cm3 g−1) and larger pore size (18.7 nm) than the Zr-FDU-12 materials obtained by the post synthesis. According to the characterization result of UV-Vis, Zr-in-F exhibited better dispersion of Zr species than materials obtained by the post synthesis. It was found that the incorporation of Zr species not only increased acidities but also enhanced the sulfidities of the Mo species. All the catalysts were evaluated for their activities in the hydrodesulfurization of dibenzothiophene, and the NiMo/Zr-in-F catalyst exhibited the best catalytic performance (97.3%), attributed to its higher specific surface area, larger pore size, higher sulfidity, and more acidic sites.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2018
·
IF 0
Zhejian Wu,Rong Chen,Qimao Gan,Jian Li,Tuqiao Zhang,Miaomiao Ye
Mesoporous Na + SiO 2 spheres with large surface areas, high porosities and tunable Na + contents have been synthesized by the Stöber method followed by the “polyvinylpyrrolidone (PVP)-protected NaOH etching” process. With the surface protection of PVP, the NaOH etching preferentially occurs inside the SiO 2 spheres results in the increase of the surface areas and porosities of the SiO 2 spheres while keeping the sphere size unchanged at the etching degree less than 50%. The surface area and pore volume of the selected Na + SiO 2 spheres with etching degree of 50% are 302.9 m 2 /g and 0.946 cm 3 /g, respectively, which are 31 times and 59 times higher than that of the SiO 2 spheres without NaOH etching. The Na + SiO 2 spheres with etching degree of 10% calcined at 400 °C shows high adsorption activity for Cr 3+ removal from different natural waters such as tap water, lake water and river water. The adsorption kinetic of Cr 3+ by the Na + SiO 2 spheres fits well with the pseudo-second-order model, and the adsorption isotherm can be fitted by the Langmuir adsorption isotherm. The maximum adsorption capacity of 10% Na + SiO 2 400 for Cr 3+ is 33.18 mg/g. Finally, it has been confirmed that the ion-exchange between Na + and Cr 3+ plays the leading role in the adsorption process while the contribution from static adsorption is relatively weak.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
JOURNAL OF MOLECULAR LIQUIDS
·
2022
·
IF 6.633
Qi Li,Yang Feng,Yi-Ting Li,Yu-Hao Ning,Ping Hu,Chuan-Huang Lin,Yi-Hong Zhang,Mei Zhou,Lin-Ping Yu,Chuan-Chang Li,Zhong Cao,Ju-Lan Zeng
In this work, pristine multiwalled carbon nanotubes (MCNTs) and mixed acids treated MCNTs (ACNTs) were applied as reinforcement fillers to prepare silica aerogels via ambient pressure drying followed by lyophilization. The prepared aerogels were then used as supporting materials to adsorb meso -erythritol (ME) to obtain novel form-stable PCMs by vacuum infiltration. Investigation of the prepared form-stable PCMs revealed that the ACNT/SiO 2 aerogels possessed higher porosity than MCNT/SiO 2 aerogels due to that the ACNTs exhibited stronger interactions with silica than the MCNTs, and could more effectively prevent the prepared ACNT/SiO 2 aerogels from collapsing and shrinking during drying. Consequently, the loading of ME in the form-stable PCMs supported by ACNT/SiO 2 aerogels (AFPCMs) was greatly higher than that in the form-stable PCMs supported by MCNT/SiO 2 aerogels (MFPCMs). When ACNT/SiO 2 -6 aerogel, in which 60 mg ACNTs were used as reinforcement filler, was applied as supporting material, the obtained form-stable PCM (AFPCM-6) exhibited a very high melting latent heat of 297.3 J/g, an elevated crystallizing temperature of 56 °C and an improved crystallizing latent heat of 231 J/g. Besides, the latent heat storage/release properties of AFPCM-6 maintained stable enough over 50 melting/crystallizing cycles. Meanwhile, the thermal conductivity of AFPCM-6 was 37.5 % higher than that of pure ME. Hence, AFPCM-6 could be an excellent form-stable PCM and could find its applications in related fields.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2013
·Vol. 15
·期 10
·2002-2008
·
IF 3.879
Huilin Hou,Chunlei Dong,Lin Wang,Fengmei Gao,Guodong Wei,Jinju Zheng,Xiaomin Cheng,Bin Tang,Weiyou Yang
It is critically important to limit the oxidation of pure SiC in humid air, especially for mesoporous SiC with large surface areas. One of the effective routes is to introduce an inert outer layer around the surface of SiC to inhibit the formation of the SiOx oxides. In present work, we report the fabrication of mesoporous graphite/SiC hybrid fibers via electrospinning of the polymer precursors containing polyureasilazane, polyvinylpyrrolidone, cetyltrimethylammonium bromide and paraffin oil, combined with subsequent high-temperature pyrolysis treatment. The resultant fibers were systematically characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM). It is found that the paraffin oil content has a profound effect on the growth of the fibers, enabling the fabrication of mesoporous graphite/SiC hybrid fibers with tunable structures and high purities. It is expected that the introduced graphite could significantly improve the surface properties of SiC mesoporous fibers, which could inspire and enhance their potential applications in photocatalysts and catalyst supports.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Qingtang Zhang,Chao Yan,Yan Meng,Xiaomei Wang
Hierarchical mesoporous Li 2 FeSiO 4 /C sheaf-rods (HMLFS-SRs) were fabricated using a hard template method with SBA-15 as a silicon source. For comparision, Li 2 FeSiO 4 /C nanocomposites (LFS) were prepared using nano-SiO 2 under the same conditions. XRD results prove that both the HMLFS-SRs and LFS contain crystalline Li 2 FeSiO 4 and trace amounts of Fe 3 O 4 impurities. The SEM and TEM images indicate that the HMLFS-SRs are hierarchical sheaf rods composed of nanoparticles . EDS data prove that elemental Fe, Si, O and C are uniformly distributed throughout the whole Li 2 FeSiO 4 /C sheaf rod. Nitrogen adsorption/desorption analyses further indicate that the HMLFS-SRs are typical mesoporous materials with an external surface area of 47 m 2 g −1 , which is higher than that of the LFS (31 m 2 g −1 ). These unique structures enable the HMLFS-SRs to exhibit much better electrochemical performance than the LFS. The HMLFS-SRs deliver a high discharge capacity of 206.6 mAh g −1 at 0.1 C. In addition, the HMLFS-SRs also have good cycling performance, satisfactory rate performance, a low charge transfer resistance and a large lithium-ion diffusion coefficient .
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Dewei Wan,Chaoren Yan,Qiuyu Zhang
Multifunctional magnetic polydopamine (PDA) nanospheres have become a research hotspot, especially in the field of biocatalysis, owing to their good biocompatibility and abundant functional groups. However, facile and rapid synthesis of hollow magnetic mesoporous PDA (HM-MPDA) with high saturation magnetization, large tailored pore size, excellent structural thermal stability, and controllable shell thickness is still a challenge. Herein, HM-MPDA nanospheres with ultrahigh magnetization (∼82.2 emu/g), ultra-large tunable pore sizes (11.53–49.53 nm), rigid pore structures (at 550 °C), and controllable shell thickness (23–178 nm) are synthesized based on a novel nanoemulsion co-assembly approach. Impressively, the hollow magnetic mesoporous PDA nanoflowers (HM-MPDA-NFs) are obtained by simply adjusting the amount of 1,3,5-trimethylbenzene and the P123/F127 weight ratios. Considering their unique properties, lipases were successfully immobilized on the pore walls of HM-MPDA-NFs, which were employed for the preparation of biodiesel. Under the optimum esterification conditions, the conversion of biodiesel can reach up to 87.9% and still exceed 71.3% after six times of recycling. More importantly, this study opens up a new way to fabricate hollow magnetic mesoporous nanocarriers, which can provide many applications in biocatalysis, dye adsorption, electrochemistry, and biosensing.
研究领域:
材料科学
·
生物催化
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS LETTERS
·
2020
·
IF 3.204
E. Loni,M.H. Siadati,A. Shokuhfar
In the current work, for the first time, hard-templating method was applied to synthesize mesoporous Na 2 CoP 2 O 7 powder for oxygen evolution reaction (OER) application. X-ray diffraction patterns (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and Brunauer–Emmett–Teller (BET) analyses were carried out for investigating the structure, composition, and morphology of the electrocatalyst powder. The electrocatalytic performances of the mesoporous Na 2 CoP 2 O 7 (meso-Na 2 CoP 2 O 7 ) powder along with its composites with reduced graphene oxide (rGO) were studied by linear sweep voltammetry (LSV). The meso-Na 2 CoP 2 O 7 /rGO (50/50 wt%) composite required only 167 mV overpotential to produce a current density of 10 mA cm −2 .
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Zhengliang Zhao,Xuelin Wang,Zhu Shu,Jun Zhou,Tiantian Li,Wenbin Wang,Yigen Tan
Mesoporous g-C 3 N 4 consisting of hollow nanospheres (MCNHN) was prepared via a facile vapor-deposition method. It demonstrated an excellent visible-light photocatalytic H 2 evolution activity of 22.3 times greater than bulk g-C 3 N 4 . The special hollow nanosphere structure, increased specific surface area and modified crystalline enabled MCNHN to realize stronger light harvest and better photoinduced electron-hole separation, which leaded to highly improved photocatalytic performance. The proposed method and setup are easy to be established, and have the potential for preparing nanoscale g-C 3 N 4 with other tailored nanostructures.
研究领域:
材料科学
·
光催化
·
纳米材料
·
能源化学
·
半导体催化
✓ 已验证
DOI
高影响因子
TALANTA
·
2019
·
IF 4.916
Zunmei Feng,Chuanhui Huang,Yuheng Guo,Wei Liu,Lan Zhang
Although an efficient and stable fiber coating is essential for the development of the solid-phase microextraction (SPME) technique, it remains a challenging prospect. We report herein the construction of graphitic carbon nitride derivative (g–C 3 N 4 –d) nanosheets having a large surface area, large mesopores (3.15 and 36.6 nm), and abundant adsorption sites, and the application of coating g–C 3 N 4 –d on an SPME fiber. The coated SPME fiber combined with gas chromatography-mass spectrometry (GC-MS) was used for the determination of polycyclic aromatic hydrocarbons (PAHs). The coating contained large mesopores that accommodated large target molecules and promoted molecular diffusion inside the coating sorbent . The coating demonstrated significant extraction capability toward PAHs because of multiple interactions, including hydrophobic and strong π–π interactions. Under optimal conditions, the limits of detection for PAHs were achieved within the range of 0.01–0.10 ng L −1 . The method developed to detect eight PAHs in six river water samples from different cities, and the recoveries were ranging from 83.3 to 103.0%. The g–C 3 N 4 –d nanosheet-coated fiber was sufficiently stable to be recycled more than 200 times without obvious loss of extraction capacity. This study describes the development of a novel SPME adsorbent having excellent analytical properties.
研究领域:
分析化学
·
环境科学
✓ 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）