COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Weimin Zhang,Wenming Hao,Yanni Guo,Jinghong Ma,Ruifeng Li
Even though cetyltrimethylammonium bromide (CTAB) has been successfully used in the surfactant-templating system to create the mesostructured zeolites , the formation mechanism of the pore structure still remains elusive. Here, we investigated the sol-gel and structure evolution in the hierarchical zeolite Beta synthesis focusing on the role of CTAB in a dual templating system. It is found that the induction period was prolonged and the Ostwald ripening was retarded by the presence of CTAB in crystallization . CTAB was involved in the synthesis and incorporated within the solid phase at the first stage when mesopores were formed. However, the incorporated CTAB was released later into the solution when the crystallized microporous structure was developed. The thermogravimetric analysis revealed that CTA + cation worked both as structure directing agent (SDA) for micropores and mesoporogen for the secondary lager pores in the matrix of hierarchical zeolite Beta. Moreover, CTA + competed with tetraethylammonium cation (TEA + ) to work as the SDA for micropores, with a decrease of the total amount of CTA + and TEA + when the concentration of CTAB in the synthesis solution was increased. It is anticipated that the understanding of the role of CTAB in the sol-gel and structure evolution in the hierarchical zeolite Beta synthesis process can provide a basis for designing the synthesis of hierarchical zeolites.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Yunqi Hu,Chenyang Zhao,Zhaojun Liu,Honghai Liu,Hongjuan Zhao,Xinye Fan,Gen Li,Hong Meng,Hongtao Liu
Beta zeolite with micromesoporosity showed great application potential due to its hierarchical structure. However, this type of hierarchical zeolite was usually prepared in the presence of both an organic microtemplate and a meso-template, which limited its widespread application. In this investigation, a simple and entirely inorganic procedure to manipulate the micromesopore structure was reported. Herein, microporosity was induced by the presence of crystal seeds (CS), and mesoporosity was obtained via the introduction of potassium carbonate. The comprehensive characterization results exhibited that the obtained materials featured a high degree of crystallization and a much-enhanced mesoporosity structure (surface area of mesopores: 121.3 m2·g–1 and mesoporosity volume: 0.15 cm3·g–1). Moreover, this novel material showed greatly improved catalytic cracking properties toward heavy oil.
研究领域:
材料科学
·
化学工程
·
催化
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Jia Zhou,Tian Lan,Tianchi Li,Qi Chen,Pu Bai,Fang Liu,Zhongwei Yuan,Weifang Zheng,Xiaolin Luo,Wenfu Yan,Taihong Yan
Spent fuel reprocessing is the main part of the closed recycling of nuclear fuel. The efficient capture of radioactive iodine in spent fuel reprocessing remains a major issue for the safe utilization of nuclear energy. To possibly substitute the silver-containing zeolites of high cost, copper-doped porous silica including microporous silicalite-1 zeolite (denoted as Cu-S-1) and mesoporous SBA-15 (denoted as Cu-SBA-15) different from those of copper-exchanged ones previously reported were investigated for iodine adsorption at moderate temperature. The influence of pore diameter on iodine adsorption was emphatically discussed. Because of the nanosized pore structure, Cu-S-1 and Cu-SBA-15 exhibited high iodine adsorption capacities of 501 mg g −1 and 59 mg g −1 , respectively. The iodine adsorption capacity of Cu-S-1 was higher than those of the silver-containing ones reported up to now. Moreover, it was revealed that the microporous structure was more beneficial to adsorb iodine than the mesoporous structure. These copper-doped silica zeolites provide the possibility for the application of iodine adsorption in practical post-processing conditions.
研究领域:
材料科学
·
环境科学
·
核能工程
✓ 已验证
DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2024
·
IF 4.3
Han Wang,Bin Wang,Shizhen Dong,Yanling Yu,Nuoxin Wang,Zuowan Zhou
The vast majority of biomass derived carbon is prepared using a top-down process, however, this process lacks the freedom to design the microstructure of the derived carbon. To address this shortcoming, this study proposes a special bottom-up preparation strategy based on cellulose dissolution and breaks away from the constraints of the top-down preparation process. Research shows that this special preparation strategy can regulate the microscopic pore structure of derived carbon for application in supercapacitors. The target sample not only possesses excellent specific capacitance (512 F g −1 at 1 A g −1 ) and rate performance (71.1 % capacitance retention at 20 A g −1 ) in the three-electrode system, but also exhibits outstanding energy density (37.7 Wh kg −1 at 750 W kg −1 ) and cycle stability (capacity loss is 5.8 % after 5000 cycles) in the symmetric full capacitor. These exciting results herald the potential of the special preparation strategy proposed in this study to prepare high-quality biomass derived carbon suitable for supercapacitors.
研究领域:
材料科学
·
能源技术
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Nano Research
·
2017
·Vol. 10
·期 12
·4305-4317
·
IF 7.354
Zheng Mingbo,Zhang Songtao,Chen Shuangqiang,Lin Zixia,Pang Huan,Yu Yan
Activated graphene (AG) with various specific surface areas, pore volumes, and average pore sizes is fabricated and applied as a matrix for sulfur. The impacts of the AG pore structure parameters and sulfur loadings on the electrochemical performance of lithium-sulfur batteries are systematically investigated. The results show that specific capacity, cycling performance, and Coulombic efficiency of the batteries are closely linked to the pore structure and sulfur loading. An AG3/S composite electrode with a high sulfur loading of 72 wt.% exhibited an excellent long-term cycling stability (50% capacity retention over 1,000 cycles) and extra-low capacity fade rate (0.05% per cycle). In addition, when LiNO 3 was used as an electrolyte additive, the AG3/S electrode exhibited a similar capacity retention and high Coulombic efficiency (∼98%) over 1,000 cycles. The excellent electrochemical performance of the series of AG3/S electrodes is attributed to the mixed micro/mesoporous structure, high surface area, and good electrical conductivity of the AG matrices and the well-distributed sulfur within the micro/mesopores, which is beneficial for electrical and ionic transfer during cycling.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
电池技术
·
功能材料
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Shuang Jia,Zhijie Mao,Bo Zhang,Yaru Wang,Tianyang Sun,Guanhua Jin,Chuang Wang,Yichen Lv,Shouzhu Li,Dan Sun
Hierarchical porous activated carbon (WXAC) was synthesized from walnut xylem. Precarbonization first preserved the vascular bundle structure, followed by controlled KOH activation-etching to precisely develop the porous architecture. Systematic characterization (BET, XRD, SEM, XPS, FTIR) confirmed a 3D interconnected microtubular structure with ultrahigh surface area (3116 m 2 /g) and pore volume (1.69 cm 3 /g). This hierarchical architecture combines microporous dominance with meso/macropore synergism, while oxygen enrichment (11.6 %) and abundant functional groups enhance methylene blue (MB) adsorption. WXAC achieves exceptional adsorption capacity (1015.29 mg/g) with rapid initial kinetics (125.8 mg/(g·min) within 5 min. Over 75 % removal efficiency persists through three regeneration cycles. Mechanistic investigations identified synergistic adsorption pathways combining hydrogen bonding, electrostatic interactions, π-π stacking, and pore confinement. Furthermore, the adsorption process follows pseudo-second-order kinetic and Redlich-Peterson isotherm models, suggesting the coexistence of monolayer and multilayer adsorption mechanisms. Thermodynamic parameters confirm spontaneous endothermic behavior. This work transforms agroforestry waste into high-performance adsorbents through controlled pore engineering.
研究领域:
环境科学
·
材料科学
·
化学工程
·
纳米技术
·
吸附技术
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Jiaojiao Liu,Huifang Zhang,Ningyue Lu,Xiaoliang Yan,Binbin Fan,Ruifeng Li
A series of mesoporous ZSM-5-x (x = Si/Al molar ratio) supports, possessing various Si/Al ratios, were prepared without using the secondary templates, and the influences of acidity of ZSM-5-x on catalytic performance of Pt/HZSM-5-x samples prepared by the conventional wetness impregnation in naphthalene hydrogenation were investigated. The results show that decreasing Si/Al ratios of mesoporous ZSM-5 supports promotes the dispersion of the supported Pt species, and the catalytic efficiencies of Pt/HZSM-5-x samples for naphthalene hydrogenation depend on the integrated effects of the Pt dispersion, the acidity, and the mesoporous structure of ZSM-5 supports. This work provides the detailed influences of acidity of mesoporous ZSM-5 on catalytic performance of supported Pt catalysts in naphthalene hydrogenation.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Hong Jia,Jie Wang,Wenwen Fu,Junhua Hu,Yu Liu
Metal-organic frameworks (MOFs) have been considered as the outstanding templates and precursors in synthesizing advanced cathode materials for supercapacitor. Herein, a novel hierarchical structure with hollow Co 9 S 8 polyhedrons welding on the top of MnCo 2 S 4 nanoneedles are rationally designed via a facile in-situ vulcanization approach. The unique morphology can provide more abundant reaction sites and ensure the efficient electron transport. Due to the synergistic effect between MnCo 2 S 4 and Co 9 S 8 , the hybrid electrode delivers a favorable specific capacity of 1100.5 F·g −1 at a current density of 1 A·g −1 in three-electrode system. Furthermore, an assembled asymmetric supercapacitor comprising MnCo 2 S 4 /Co 9 S 8 and activated carbon delivers a high energy density up to 45.8 W·h·kg −1 at a power density of 800 W·kg −1 . Moreover, the device holds more than 94.8% capacitance retention after 5000 cycles, demonstrating it could be a potential electroactive material for next-generation high performance energy storage device.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2018
·Vol. 8
·期 4
·263
·
IF 3.504
Jin Liu,Huihui Gan,Hongzhang Wu,Xinlei Zhang,Jun Zhang,Lili Li,Zhenling Wang
Porous hollow Ga2O3nanoparticles were successfully synthesized by a hydrolysis method followed by calcination. The prepared samples were characterized by field emission scanning electron microscope, transmission electron microscope, thermogravimetry and differential scanning calorimetry, UV-vis diffuse reflectance spectra and Raman spectrum. The porous structure of Ga2O3nanoparticles can enhance the light harvesting efficiency, and provide lots of channels for the diffusion of Cr(VI) and Cr(III). Photocatalytic reduction of Cr(VI), with different initial pH and degradation of several organic substrates by porous hollow Ga2O3nanoparticles in single system and binary system, were investigated in detail. The reduction rate of Cr(VI) in the binary pollutant system is markedly faster than that in the single Cr(VI) system, because Cr(VI) mainly acts as photogenerated electron acceptor. In addition, the type and concentration of organic substrates have an important role in the photocatalytic reduction of Cr(VI).Keywords:Ga2O3;porous;Cr(VI);organic pollutants
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Zhengdao Li,Yan Xiong,Dongqin Bi,Qi Liu,Chuanyun Yang,Jia Zhang
To optimize the structure and composition of the metal oxide semiconductor is one of effective approaches to improve its gas-sensing performance. In this paper, Zn 2 SnO 4 solid octahedrons were first synthesized by a hydrothermal method , then converted to hollow structures with a shape preserved through a simple and practical acid etching process. Ultimately, the hierarchical ZnSnO 3 /Zn 2 SnO 4 hollow composite with porous structure was designed and prepared by in situ growth of ZnSnO 3 nanosheets on the surface of Zn 2 SnO 4 hollow octahedrons in the seed mediated wet-chemical way. It was found that through the structure evolution from solid octahedron to hollow structure, the sensitivity of gas sensor toward triethylamine (TEA) was visibly improved. Significantly, superior TEA-sensing properties, such as lower optimal working temperature, higher sensitivity, wider linear response range, more rapid response/recovery speed and more excellent selectivity were further achieved by decorating Zn 2 SnO 4 hollow octahedrons with ZnSnO 3 nanosheets. It was remarkable that the sensor based on hierarchical ZnSnO 3 /Zn 2 SnO 4 porous hollow octahedrons displayed long-term stability to TEA and anti-humidity property, suggesting its potential practical applications in detection of highly toxic TEA. The improved sensing mechanism on the strength of structure and composition evolution for the gas sensor was discussed in detail.
研究领域:
材料科学
·
传感器技术
✓ 已验证
DOI
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Ye Qu,Yanzi Zhang,Yali Zhang,Jun Song,Zhaoen Liu,Weixing Rao,Yu Liu
The multi-component synergy of electrode materials and structural engineering are crucial for high-performance supercapacitors. Herein, a novel sandwich-like MXene@NiCo-layered double hydroxides (LDHs)/Co 9 S 8 nanostructure is rational synthesized, which with rich pores can significantly facilitate the diffusion of electrolyte ions and boost high charge transfer capability. Besides, the interaction forces between components promote the integration of multidimensional materials, and the resulting hybrid structure significantly improves the electrochemical efficiency through synergistic effects. Remarkably, the obtained MXene@NiCo-LDH/Co 9 S 8 composites exhibit a high specific capacitance of 808.0 F g −1 at a low current density of 1 A g −1 , the value is nearly 1.4 times MXene@NiCo-LDH (586.2 F g −1 ), as well as good rate capability (512.0 F g −1 at 10 A g −1 ). Besides, the fabricated supercapacitor device (MXene@NiCo-LDH/Co 9 S 8 //activated carbon) showed an outstanding energy density of 96.4 Wh kg −1 at 800 W kg −1 ), and good cyclic performance of 70.26 % capacitance retention even over 9000 cycles. This research may provide a promising strategy for developing two-dimensional layered materials as an electrode material in energy storage applications.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Yuanyuan An,Guoxiu Hao,Xinyue Wang,Li Zhou,Mengyao Wu,Jialong Ma,Lien-Yang Chou
In this study, we synthesized CeO2 possessing an open pore structure and verified its structural differences compared to CeO2 lacking such an open pore structure. Using these two CeO2 samples as catalyst supports and loading them with Pd metals, a series of characterizations were carried out on the resultant catalysts to analyze their structures and properties meticulously. We have elucidated the influence of the open pore structure on the loading position of Pd. Hydrogenation reactions involving alkynes and alkenes were employed to confirm the existence of steric hindrance effects caused by the pore structure differences. Furthermore, we applied these catalysts to more valuable industrial reaction systems, demonstrating that the unique pore structures of directly synthesized CeO2 can also exhibit excellent performance in practical applications.
研究领域:
材料科学
·
催化化学
✓ 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）