CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Qilin Guo,Qingchao Wang,Yiyong Pan,Boyuan Kang,Wenlong Xu,Xinxin Zhao,Yuxin Wang,Chenhao Li,Hongyu Ba,Shuang Chen,Huie Liu
Due to its high porosity, large specific surface area, and strong photothermal conversion performance, graphene aerogel has unique advantages in the field of pollution treatment, especially in the field of recovering highly viscous oils. However, for the treatment of highly viscous oils, the high adsorption capacity and high adsorption rate of graphene aerogel often cannot be combined, which is one of the important reasons limiting its development in this field. A double-step templating strategy for graphene aerogels preparation was used in this work, i.e., Pickering emulsion soft templating and unidirectional freeze casting. Specifically, the dense Pickering emulsion droplets can be stabilized in a short period of time, so that they can be cured quickly. After that, graphene aerogels (DGA-0.8-25) with dual pore structure were prepared by unidirectional freeze casting technology to further form aligned pores based on the pores formed by the Pickering emulsion droplet soft template. The dense presence of Pickering emulsion droplets gives DGA-0.8-25 an ultra-high porosity (96.8 %), which can adsorb 184.53 times its own mass of crude oil. Due to the unidirectional pore structure, the adsorption rate of DGA-0.8-25 on crude oil is as high as 8.39 g·g −1 ·min −1 , which realizes dual improvement of the adsorption capacity and rate of graphene aerogel on crude oil and shows a good application prospect in the treatment of high viscosity crude oil. In addition, DGA-0.8-25 has unique advantages in the field of oil–water separation, with a separation efficiency of 99.04 % for water-in-oil emulsions and 97.63 % for oil-in-water emulsions. When repeated used in photothermal adsorption of highly viscous oil, DGA-0.8-25 can still maintain more than 90.61 % of its initial adsorption capacity after ten cycles of use-regeneration. Because of its unique advantages such as high efficiency and low cost, DGA shows promising in its future large-scale use.
研究领域:
材料科学
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环境科学
·
化学工程
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产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Kai Lv,Dewen Zheng,Yangyang Shi,Xi Zhang,Feihong Wang,Jianming Li,Shanyu Wang,Binbin Dong,Lu Yuan Hao,Liangjun Yin,Xin Xu,Yuxi Xian,Simeon Agathopoulos
Electrode design and fabrication are of major importance for hydrogen evolution reaction applications, as far as high-efficiency and low-cost production of hydrogen are concerned. This paper reports on a titanium-nitride-ceramic-membrane electrode modified by MoS2 nanoflakes. Porous TiN-ceramic membranes were fabricated by phase-inversion tape-casting, followed by pressureless sintering. The as-prepared TiN membranes contained straight finger-like pores with an average diameter of 80 μm and smaller pores with an average diameter of 1–3 μm. Then, MoS2 nanoflakes were perpendicularly, densely, and uniformly grown on the surface of the TiN grains through the one-pot hydrothermal method. The optimized MoS2/TiN membrane electrode displayed a low overpotential of 113 mV at 10 mA cm–2, a Tafel slope of 78 mV dec–1, a small charge transfer resistance of 1.44 Ω, and a high double-layer capacitance of 504 mF cm–2. It also exhibited excellent stability with slight degradation after 80 h testing at an overpotential of 150 mV in 0.5 M H2SO4. The high conductivity of the TiN substrate, the similar chemical bonds, which favored the rapid electron transfer between MoS2 and TiN, the abundant exposed active sites of MoS2 nanoflakes, and the unique dual-pore structure resulted in the above superior electrocatalytic activity. The proposed successful utilization of conventional ceramic-membrane technology to prepare electrocatalysts based on membrane electrodes has potential for large-scale application in industrial hydrogen production.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
·
IF 9.8
Shaoyi Wang,Jun Wei,Zijing Zheng,Jiawei Wu,Jianqiang Xu,Haijian Xie
Phthalic acid ester (PAE) is a toxic pollutant commonly found in high concentrations in municipal solid waste landfills. Soil–bentonite is widely used as a barrier material to control groundwater contaminants from landfill leachates . Traditional soil–bentonite materials always have a limited capacity for organic pollutant adsorption. To address this issue, the adsorption and transport behavior of dimethyl phthalate (DMP) on loess amended with two kinds of modified bentonite (HTMAC-B, modified with hexadecyltrimethylammonium chloride; CMC-B, modified with hydrophobic cationic surfactant, and carboxymethyl cellulose) were investigated. The kinetics of DMP adsorption indicates that film diffusion contributes significantly to the kinetic adsorption of DMP on HTMAC-B. The adsorption isotherm results showed that partitioning dominated DMP adsorption on loess with both modified bentonites. Owing to the in-ionic sites in HTMAC-B, which attracted hydrophobic compounds such as DMP, the adsorption capacity of 5 % HTMAC-B-amended loess (LH) was increased by a factor of 3.2. However, because CMC-B provided mostly ionic sites, 5 % CMC-B-amended loess (LC) had a little effect on DMP adsorption. The hydraulic conductivity values of LH and LC were 5.95 × 10 −10 and 1.65 × 10 −11 m/s, respectively. The X-CT result showed that there is a significant porosity change for both LH and LC. Dual-porosity model reveals that the leaching process primarily affects micro-pores, rather than larger pores in the soil matrix. The predicted retardation factors for LH and LC were 38.89 and 9.67, respectively. When using loess-bentonite as barrier material, the amendment of HTMAC-B and CMC-B can help to increase the retardation ability and reduce the permeability, respectively.
研究领域:
环境科学
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污染控制
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产品关联
DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2022
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IF 10.723
Ying Tang,Penghui Wang,Hui Zeng,Zebao Rui
Fabrication of highly-efficient enzymatic supports having excellent affinity to enzymes and superior mass transfer properties is highly desirable for enzymatic bio-catalysis. Herein, newly engineered chitosan macrospheres having interconnected and interlaced network pores are prepared via dual pore-forming strategy and applied as novel host for the effective immobilization of alkaline protease. The synergetic effect of SiO 2 templates and gas-induced pore-forming agents play an important role in inhibiting the over-crosslinking of chitosan chains and promoting the elevation of interior porosity. Benefited from the highly exposed surface and abundant available binding sites, the as-developed porous support P 2 CSM achieves a maximum loading capacity of 43.8 ± 0.8 mg/g and ultra-high activity recovery of 92.4 % for alkaline protease. P 2 CSM is competent to effectively stabilize the structural conformation of alkaline protease from inactivation through the flexible covalent interaction. Considering these attributes, Protease@P 2 CSM demonstrates remarkably better structural stability, reusability and SDS-resistance than free alkaline protease, as well as excellent proteolytic ability, and the residual activity of Protease@P 2 CSM is evaluated as high as 70.3 % after 7 consecutive reuses. This work provides a promising avenue to construct highly-active enzyme-composites for widespread utilization in various practical applications.
研究领域:
生物化学
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酶工程
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材料科学
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产品关联
DOI
PubMed
高影响因子
ADVANCED MATERIALS
·
2024
·Vol. 36
·期 36
·2309572
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IF 27.4
Bo Wang,Wen-tai Zhao,Xiao Xu,Chen Zhang,Shuai-ying Ding,Yue Zhang,Tie Wang
The construction of ultrathin porous membranes with stable structures is critical for achieving efficient gas separation. Inspired by the binary-cooperative structural features of bones and teeth—composed of rigid hydroxyapatite and flexible collagen, which confer excellent mechanical strength—a binary-cooperative porous membrane constructed with gel-state zeolitic imidazolate frameworks (g-ZIFs), synthesized using a metal-gel-induced strategy, is proposed. The enlarged cavity size and flexible frameworks of the g-ZIF nanoparticles significantly improve gas adsorption and diffusion, respectively. After thermal treatment, the coordination structures forming rigid segments in the g-ZIF membranes appear at the stacked g-ZIF boundaries, exhibiting a higher Young's modulus than the g-ZIF nanoparticles, denoted as the flexible segments. The g-ZIF membranes demonstrate excellent tensile and compression resistances, attributed to the effective translation of binary-cooperative effects of rigidity and flexibility into the membranes. The resulting dual-aperture structure, composed of g-ZIF nanoparticles surrounded by nanoscale apertures at the boundaries, yields a membrane with a stable CO 2 permeance of 4834 GPU and CO 2 /CH 4 selectivity of 90 within 3.0 MPa.
研究领域:
材料科学
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化学工程
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膜技术
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产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
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2019
·Vol. 43
·期 15
·5833-5838
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IF 3.069
Juan Wei,Like Zou,Yulong Li,Xiaoming Zhang
By combining a sol–gel process and an oil–water biphase stratification, monodispersed core–shell structured mesoporous silica nanospheres with uniform size (∼150 nm), high surface area (738 m2 g−1), large pore volume (0.785 cm3 g−1) and dual-pore channels (2.5, 7.3 nm) were successfully fabricated. This approach can also be used to prepare other core–shell mesoporous materials. After positioning metal nanoparticles (Pt NPs) in the inner cores and endowing the hierarchical silica nanospheres with interface-activity by hydrophobic modification (–CH3), such materials could be utilized in biphasic catalysis. And owing to the increased reaction interface area and smart hierarchical mesostructure, the core–shell catalyst exhibits significantly enhanced catalytic efficiency in water medium hydrogenation reactions.
研究领域:
材料科学
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催化化学
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2025
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IF 7.7
Qiang Chen,Yi Cai,Tianyu Jiang,Qing Chen,Jianhua Wang,Yong Zhao
Double-hole optical fiber (DHF) exhibits considerable potential for sensing applications due to its distinctive structural characteristics. In this study, a Sagnac interference (SI) optical fiber sensor based on a corroded DHF shows high refractive index (RI) sensitivity, allowing for the detection of copper ions, Cu(II), at very low concentrations. The dependence of DHF corrosion on the birefringence and RI sensitivity are investigated by the optical simulation. Experimental results illustrate that the RI sensitivity reaches 3267 nm/RIU within the range of 1.3333–1.3743, exhibiting good linearity. A chitosan derivative (CSD) with ion-imprinted (IIM) treatment is coated on the surface of the corroded DHF for Cu(II) detection. It is demonstrated that within the concentration range of Cu(II) from 10 −15 to 10 −6 M, both the maximum and average sensitivities can reach 12.08 × 10 9 and 129.96 nm/μM, respectively, without interference from other metal ions or temperature (25.3–44.0 ℃). The proposed corroded DHF sensor is a good candidate for RI and Cu(II) concentration detection due to its simple structure, high sensitivity, and selectivity.
研究领域:
光学传感
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材料科学
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分析化学
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产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
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2019
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IF 7.723
Yuli Wei,Zhiwang Yang,Guohu Zhao,Wu Yang
Carbon nanotube sieves (CNTs-S) with a flutelike shape were synthesized by cutting and perforating using a chemical oxidation etching method. Using the obtained CNTs-S as a hard template, SiO 2 -coated CNTs-S dual pore structures (CNTs-S@SiO 2 ) were formed. Finally, tungstophosphoric acid was supported on CNTs, CNTs-S, and CNTs-S@SiO 2 matrices by the incipient wetness method to obtain the corresponding supported catalysts PW 12 /CNTs, PW 12 /CNTs-S, and PW 12 /CNTs-S@SiO 2 . The results showed that obtained 30%PW 12 /CNTs-S and 30%PW 12 /CNTs-S@SiO 2 catalysts in 30 wt% dipping solution had the best catalytic performance for Baeyer–Villiger oxidation of cyclic ketones by H 2 O 2 . The conversion of cyclohexanone was 94% and 91%, respectively, in 5 min under microwave irradiation. Cyclopentanone and adamantanone approached quantitative conversion and the selectivity of corresponding lactones reached 100%. The dual pore structure catalyst showed very excellent cyclic stability.
研究领域:
材料科学
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催化化学
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产品关联
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 37
·22855-22859
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IF 3.108
Junshan Sun,Yinfeng Han
A novel bis(porphyrinato) terbium double-decker complex HTb(DADAPor)2 with a twisted cuboid octupolar molecular symmetry exhibits the largest off-resonant first hyperpolarizability, as evaluated by harmonic light scattering measurements with = 1700 × 10−30 esu.
研究领域:
化学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·
IF 3.8
Yansong Liu,Yongsheng Liu,Yejie Cao,Xiang Zheng,Xiaokun Sun,Yang Xu
Dual porous yttria-stabilized zirconia (YSZ) ceramics were fabricated via digital light processing (DLP) additive manufacturing using polymethyl methacrylate (PMMA) microspheres as pore-forming agent for the first time. The results showed that the introduction of PMMA microspheres effectively reduced the viscosity of the photosensitive YSZ ceramic slurry used in DLP printing, improved the cured depth of the slurry, and did not exert a strong influence on stability. After sintering at 1400°C, pores with dual scales were generated in the ceramics, while exhibiting the optimal physical and mechanical properties. With the increase of PMMA content from 0 to 40 vol%, the open porosity increased from 1.96% to 34.06% and the density decreased from 5.92 to 3.82 g/cm 3 , respectively. The compressive strength and thermal conductivity of porous ceramics decreased from 350.54 to 99.85 MPa and from 2.80 to 1.46 W/(m⋅K), respectively. This investigation opens up new prospects for the fabrication of porous YSZ ceramics with low thermal conductivity and high mechanical properties.
研究领域:
材料科学
·
增材制造
·
陶瓷工程
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Yingchen Xu,Chenghan Yang,Qinghua Deng,Yuming Zhou,Chunfeng Mao,Youchao Song,Min Zhu,Yiwei Zhang
It is highly desirable and challenging to design efficient and stable hydrogen evolution reaction (HER) electrocatalysts in a variety of acidic and alkaline media. Here, a novel ternary catalyst has been proposed consisting of ruthenium dioxide doped carbon nanotubes (denoted as RuO 2 @CNT) wrapped in a multi-step strategy with a first synthesis of a bismuth metal porphyrin-based organic framework as co-catalyst (denoted as RuO 2 @CNT@MOF). The addition of CNT improves not only the conductivity of the electrocatalyst but also the distribution of the active RuO 2 particles. Furthermore, the highly symmetrical conjugated structure of Bi-TCPP MOF facilitates both the adsorption of hydrogen ions and the generation of hydroxyl radicals (•OH). The Bi-TCPP MOF encapsulated in the outer layer of RuO 2 @CNT enhances the mechanical strength and creates the confinement effect, leading to the synthesis of RuO 2 @CNT@MOF as a HER electrocatalyst that exhibits excellent catalytic performance and acid and base resistance. In particular, low overpotentials of 13 mV and 50 mV can be achieved to provide current densities of 10 mA cm −2 in alkaline and acidic media, respectively. Significantly, this work provides new ideas for the careful design and development of MOFs as co-catalysts to improve the overall performance of materials in energy-related fields.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Li Wang,Huihui Liang,Mengli Xu,Linyu Wang,Yi Xie,Yonghai Song
Herein, a covalent organic framework with dual-pore sizes prepared by ammonia-aldehyde condensation reaction (COFETTA-TPAL) was proposed to load microperoxidase-11 (MP-11) and glucose oxidase (GOD) for ratiometric electrochemical glucose biosensing. The COFETTA-TPAL were flexible two-dimensional (2D) nanosheets with highly ordered crystalline conjugated structure and dual-pores of 3.06 nm and 0.87 nm. The size of MP-11 and GOD matched with its large and small pore well and accordingly they could be embedded into the pores of COFETTA-TPAL through pore encapsulation and hydrogen bond between N-doped skeleton of COFETTA-TPAL and −COOH of MP-11 and GOD. The good flexibility allowed them to be firmly attached to the electrode surface, just like chitosan and nafion which were usually used to modify electrode. The GOD-MP-11−COFETTA-TPAL modified electrode exhibited the reduction peak of COFETTA-TPAL near 0.15 V ( j 0.15 V) and the reduction peak of MP−11 at −0.4 V ( j −0.4 V). The j −0.4 V was decreased gradually and the j 0.15 V was kept constant with the adding of glucose. The j −0.4 V/ j 0.15 V linearly reduced with the glucose concentration varied from 0.017 mM to 3 mM, and the detection limit was 4.97 μM. The biosensor also displayed good selectivity, stability and reproducibilty. The work successfully proved the application of COF as support platform to load enzymes/proteins for electrochemical biosensors.
研究领域:
生物传感器
·
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）