SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Junjing Li,Wanxin Dang,Yaqian Liu,Liang Wang
The efficiency of an electrocatalytic system with filtered Pd-loaded membrane electrodes was investigated to improve the mass transfer process of the electrocatalytic system. A Pd/CGC/Al 2 O 3 membrane electrode (5 mg·cm −2 graphite + 10 wt% graphene + 5 wt% carbon black) was prepared on the tubular Al 2 O 3 membrane substrate. The results showed that the membrane electrode could realize the complete removal of chlorpheniramine maleate (CPM) 120 min. Furthermore, the Pd/CGC/Al 2 O 3 membrane electrode exhibited good tolerance to sulfites, and the electrocatalytic activity was almost unaffected in the presence of NO 3 – , Cl − , CO 3 2– , and HCO 3 – in the wastewater. The Pd/CGC/Al 2 O 3 membrane electrode surface was interconnected to form a three-dimensional porous membrane structure through the introduction of carbon materials. The membrane electrode had a larger specific surface area and the metal Pd nanoparticles were uniformly loaded on the surface of CGC/Al 2 O 3 tubular electrode. Combined with the analysis of quenching experimental data, the removal mechanism of CPM on Pd/CGC/Al 2 O 3 membrane electrode was proposed. The Pd/CGC/Al 2 O 3 membrane electrode had good stability over 7 cycles and could be adapted to the electrocatalytic hydrodechlorination of chlorinated PPCPs in different environments, which is promising for certain applications.
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高影响因子
Catalysts
·
2024
·Vol. 14
·期 7
·428
·
IF 3.8
Weiying Wang,Changlin Chen
Tetrahydrofurfuryl alcohol, a cost-effective biomass derivative, offers a sustainable path for synthesizing 1,5-pentanediol through hydrogenolysis. To develop the efficient production of 1,5-pentanediol from this alcohol, we have prepared a series of MgAl2O4-modified Pt/WOx/γ-Al2O3catalysts with varying compositions via impregnation–calcination methods. The physicochemical properties of these catalysts were subsequently characterized using diverse techniques. Characterization revealed that magnesia–alumina spinel modification enhanced Pt particle dispersion, CO adsorption on Pt/WOx/γ-Al2O3, reduced Pt particle reduction temperature, diminished the acid content in the catalysts, and increased the surface oxygen vacancy concentration. These alterations appear to influence the catalyst performance, though other factors cannot be ruled out. Catalytic activity tests demonstrated that magnesia–alumina spinel modification improved tetrahydrofurfuryl alcohol hydrogenolysis activity and the 1,5-pentanediol selectivity of Pt/WOx/γ-Al2O3. Optimal performance was achieved at 12% magnesia–alumina spinel loading, with a tetrahydrofurfuryl alcohol conversion of 47.3% and 1,5-pentanediol selectivity of 88.4%.
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高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Tonghe Xing,Annan He,Zhiming Du,Yu Zhang,Yuxin Luo,Zhiyu Huang,Mengqi Wang,Zhicheng Shi,Aixin Tong,Sijie Qiao,Xiaohong Liao,Jie Bai,Heng Pan,Zihui Liang,Wei Ke,Hao Yu,Fengxiang Chen
Silk fiber, as a luxurious textile raw material, is widely used in the textile industry due to its excellent mechanical properties and wearing comfort. However, the poor (ultraviolet, UV) light stability of silk affects its further application in high-end textiles, fashionable apparel, and smart materials. Although surface modification can endow the excellent UV resistance of silk fibers, it often reduces its comfort property. Herein, a laminated ultrathin Al2O3/TiO2 coating with a total thickness of 120 nm is fabricated on the surface of silk fiber via a modified atomic layer deposition (ALD) technique. The tenacity of ALD-coated silk can maintain 61.1% of its original value after exposure to intense UV light (640 mW/cm2) under high temperature (>200 °C) for 6 h, which is far superior to other work that has been reported. This can be attributed to the synergistic effect of the reflection of UV light by the multilayer film barrier, the strong oxidizing free radicals by the Al2O3 layer in the innermost layer, and thermal shield of laminated ultrathin Al2O3/TiO2 film. ALD-coated silk fabrics can also demonstrate a multicycle laundering durability, thermal and chemical stabilities, and flame retardancy. More importantly, the wearing comfort of the modified silk has no obvious change. This method provides principle and technical guidance in high-performance and multifunctional fibers and devices.
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PubMed
高影响因子
JOURNAL OF CATALYSIS
·
2025
·
IF 6.5
Yuxuan Xie,Zhao Li,Ziruo Zeng,Lina Sun,Shuangyou Bao,Xin Sun,Kunlin Li,Chi Wang,Fei Wang,Ping Ning,Kai Li
To investigate the mechanism of the role of active center size on the selectivity of methyl mercaptan (CH 3 SH) and methane (CH 4 ) in the deep hydrogenation reaction of carbon disulfide (CS 2 ), it was first derived from DFT calculations that the Pt cluster geometries showed a decreasing and increasing pattern on the energy barriers of the two key hydrogenation steps: (I) HCSS* to HCSSH* and (II) deep hydrogenation of CH 2 S* to CH 3 SH. For further validation, we synthesized Pt NPs with varied average sizes (1.7–4.0 nm) using a reduction-agglomeration strategy to probe the source of size sensitivity at low Pt loading. It was found that the active centers of Pt NPs located in the 2.0–3.0 nm region have the highest proportion of medium-coordinated Pt sites, which can effectively promote hydrogen spillover and enhance the HCSS* pathway. Finally, with this modulation strategy, the catalytic activity and selectivity were significantly improved at 1 wt% Pt loading, which exceeded that of the fresh 4 wt% Pt/Al 2 O 3 catalyst, and the long-term stable production of CH 3 SH (selectivity was maintained at 80 %) was achieved at 250 ℃ in the high-concentration CS 2 environment.
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高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2025
·
IF 7.8
Shanshan Huang,Bolin Li,Gezi Li,Siyuan Zheng,Kanglin Tian,Weimin Xie,Simiao Wu,Jun Wang,Ying Yu,Xiaoman He
There is currently an urgent need to develop technologies for ciprofloxacin (CIP) removal in wastewater owing to its widespread usage in human and animal populations and subsequent transmission into surface water. Aluminum (Al 2 O 3 ) is an excellent carrier, and polydopamine (PDA) is a surface modifier with a high nitrogen content and strong adhesion, and may represent a potential tool for CIP removal in wastewater. However, minimal research has been conducted on using PDA to improve the interactions between carrier and active components and thus improve the ozone utilization efficiency as well as catalytic activity and stability in CIP removal schemes. To address this research gap, study successfully prepared Fe-Mg/PDA@Al 2 O 3 composite materials for the catalytic ozone removal of CIP from water. The influencing factors and degradation mechanisms of the catalytic ozone treatment of ciprofloxacin wastewater and possible antibiotic degradation pathways were proposed. The removal of CIP was mainly carried out through indirect oxidation dominated by hydroxyl radicals (•OH), in addition to catalyst adsorption and direct ozone oxidation, and the oxidative degradation of CIP conformed to a pseudo-first-order reaction kinetic model. Under ideal operating conditions, the CIP degradation efficiency of Fe-Mg/PDA@Al 2 O 3 /O 3 system reached 91.35% after 15 min. The mineralization efficiency of Fe-Mg/PDA@Al 2 O 3 /O 3 system was significantly higher than that of the single-ozone system. After four repeated uses of Fe-Mg/PDA@Al 2 O 3 , the CIP degradation efficiency remained stable, and the metal ion leaching concentration was within the limit, indicating that Fe-Mg/PDA@Al 2 O 3 demonstrated a high catalytic performance and stability.
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高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Jianfeng Du,Yongpeng Huang,Yikai Yun,Wenjie Wei,Sijie Jiang,Yinxiao Yang,Mengyu Chen,Cheng Li
The deposition of charge blocking layer (CBL) has been proved as an essential approach to improve the unbalanced charge injection and enhance the external quantum efficiency (EQE) of perovskite light-emitting diodes (PeLEDs). Nonetheless, in near-infrared (NIR) PeLEDs, the CBL covering on the typical ZnO electron transport layer (ETL) usually affects the deprotonation process and thereby decreases the crystallinity of perovskite film. In this work, we improve the performance of PeLEDs by atomic layer deposition (ALD) of an ultra-thin (0.43 nm) aluminum oxide (Al 2 O 3 ) CBL between the ETL ZnO and perovskite layer. This CBL improves the charge injection balance and optimizes the morphological and crystalline characteristics of perovskite film. The NIR PeLEDs achieve a peak EQE of 17.0 % with the optimal Al 2 O 3 CBL, representing a 25 % enhancement compared to the control device. In particular, with in-situ electroabsorption (EA) spectroscopy, we discover that the presence of interface permanent dipoles ascribed to the ultra-thin Al 2 O 3 CBL, facilitates the charge injection balance by greatly increasing the built-in potential and reducing the electron injection. Hence, this work paves a practical way to enhance the efficiency of NIR PeLEDs without influencing the deprotonation process.
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高影响因子
Journal of Science-Advanced Materials and Devices
·
2025
·
IF 6.8
Shuting Zhang,Yuhan Dou,Dan Liao,Xu Long,Qi Lin,Shusen Wei,Chen Jin,Xuan Wu,Hong Dong,Yanjiang Song,Zhirong Qu,Chuan Wu
This study tackles thermal management challenges in high-power electronics by developing trimethoxy-terminated polydimethylsiloxane (PDMS) with tailored branched architectures (TTMOS series) as surface treatment agents (STAs) for AlN/Al 2 O 3 hybrid fillers. We systematically optimized filler size distribution, STA structure, and matrix viscosity to enhance thermal interface material (TIM) performance. Critical findings reveal that a hybrid filler mass ratio of 120 μm AlN: 3 μm Al 2 O 3 : 0.5 μm Al 2 O 3 = 8:4:2 (87 vol% loading) delivers exceptional thermal conductivity ( λ = 9.74 W m −1 K −1 ), low thermal resistance ( θ = 2.86 K cm 2 W −1 ), balanced penetrability (54.6/0.1 mm), and oil resistance ( R 16h = 1.50). Branched STAs, such as TTMOS-T1, significantly outperform linear analogues by enhancing interfacial compatibility, suppressing particle agglomeration (validated via SEM/XPS), and reducing oil seepage ( R 16h = 1.45 vs. 1.77 for TTMOS-I), while maintaining a high thermal conductivity ( λ = 9.79 W m −1 K −1 ). A 100 mPa s Me-PDMS matrix further ensures post-thermal cycling stability, with λ increasing from 9.13 to 9.26 W m −1 K −1 . Practical validation demonstrates that TTMOS-T1-modified grease reduces the surface temperature of a 30 W HB-LED chip by 10 °C versus commercial TIMs, highlighting its real-world efficacy.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2025
·Vol. 36
·期 5
·e70202
·
IF 3.4
Chaoxin Wang,Qi Wang,Yongliang Wang,Peigang He,Zhidong Han
The developing trends of electrical and electronic devices in high-power operation, densified installation, and structural miniaturization challenge the application of the composites with efficient thermal conductivity. In view of the manufacture technology of polyolefin materials, the melt-processing strategy was designed to prepare the thermally conductive composites based on polypropylene/polyolefin elastomer (PP/POE) blend with hexagonal boron nitride (hBN) and alumina oxide (Al 2 O 3 ). By filling hBN and Al 2 O 3 separately into the co-continuous PP/POE blend, the selectively distributed structure with hBN in the PP phase and Al 2 O 3 in the POE phase was revealed, and the thermal conductivity of the composites was improved with selective filler distribution. The processing scheme exerted distinct influences on the distribution structure and the thermal conductivity of the composites with the same filler content. A superior thermal conductivity of 0.80 W/(m K) was achieved with the individually distributed structure of BN and Al 2 O 3 together with the bridged interaction between PP/BN and POE/Al 2 O 3 phases. The reduction in interfacial thermal resistance contributed to the enhanced thermal conductivity according to the simulation with finite element analysis (FEA). The proposed strategy provides an efficient way to mass manufacture thermally conductive polypropylene composites.
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Shuhuai Wang,Xiqing Xu,Jianglin Wang,Yongkang Yang,Shuqi Yang,Peng Zhao,Shuxin Niu,Xin Li
Nanostructured amorphous composites exhibit superior mechanical properties compared to crystalline materials due to their disordered atomic arrangement and high defect density. Spark plasma sintering (SPS) is a suitable technique for in-situ synthesis of nano-amorphous composites, allowing densification of amorphous powders via viscous sintering. In this work, amorphous nanopowders of Al 2 O 3 -La 2 O 3 (AL), Al 2 O 3 -La 2 O 3 -ZrO 2 (ALZ), and Al 2 O 3 -ZrO 2 (AZ) were prepared using sol-gel method, followed by densification into nanostructured amorphous composites via SPS in the super-cooled liquid region (SCLR). The AL sample demonstrates a uniform structure, achieving the maximum relative density of 98.1 % along with minimum crystallinity of 30.22 % after SPS at 890 °C. However, with increasing SPS temperature, the relative density of AL sample decreases instead of increasing. This phenomenon is due to the promotion of amorphous-to-crystalline phase transition at high temperatures, which inhibits the viscous flow of amorphous phase during SPS and hinders the densification. Attributed to the narrow SCLR of AZ and ALZ systems, they are faced with the competition between crystallization and structural densification. The crystallinity values are 64.86 % and 51.16 % for AZ and ALZ systems, while the maximum relative densities were 91.9 % and 96.6 %. The SCLR is confirmed as a primary factor to regulate the competition between relative density and crystallization of amorphous powders, and AL system with widest SCLR ( Δ T x = T x - T g = 72 °C) is beneficial to the densification of nanostructured amorphous composites. Furthermore, STEM-BF and HRTEM reveal nanocrystalline precipitation from amorphous phase matrix during sintering process, and the nanoindentation tests indicate superior mechanical propriety of AL nanostructured amorphous composites.
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高影响因子
Catalysis Science & Technology
·
2025
·
IF 4.2
Longhao Xu,Wenhao Zhang,Liang Shen,Minghui Zhu,Yi-Fan Han
Despite the substantial efforts in the conversion of carbon dioxide (CO2) into high value-added products, directly transforming CO2 into CH4 at low temperatures still poses a formidable challenge. In this study, we report a bottom-up strategy to synthesize supported Ni catalysts on a doped Al2O3 support. LaAl mixed oxide was first synthesized via a co-precipitation method, followed by Ni species loaded using a deposition precipitation method. The CO2 conversion of the Ni/LaAl catalyst is found to be greatly enhanced, two times higher than that of the Ni/Al2O3 catalyst at 250 °C. The characterization results show that the introduction of La promotes the dispersion of Ni, reduces the reduction temperature of NiO and facilitates the adsorption of CO2 by increasing the basic sites. Temperature-programmed reduction with H2 demonstrated that La2O3 promotes the reducibility of NiO. Furthermore, kinetic analysis, in situ DRIFTS and CO methanation tests evidenced that La2O3 promotes the activation of CO2 and accelerates the CO hydrogenation step.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Nan Sheng,Wenlong Li,Shasha Lu,Renjie Liu,Songcen Shi,Hongzhi Liu,Chunyu Zhu
Phase change thermal storage represents a valid solution to the problem of renewable energy indirection. Metals have a high heat storage density and high thermal conductivity, making them a promising material for high-temperature phase change materials, yet limited in application by corrosion. As a solution, a boiling and cold pressing with subsequent calcination method was proposed for the development of shape-stabilized PCMs with Al as a phase change material and Al 2 O 3 as the matrix. A three-step preparation process was involved: (1) Generation of precursor shell layer on the surface of Al micropowder by boiling water treatment. This step was crucial for leakage prevention. (2) Stabilization and composite formation of the phase change material by cold pressing. In this step, we carefully studied the effect of pressure on the structural strength of composite phase change materials (PCCMs) and finally concluded that 10 MPa was the optimal cold pressure. (3) Formation of structurally stable PCCM was finalized by thermal oxidation treatment. The phase transition temperature and latent heat of phase transition of PCCM were 653°C and 68 J/g, respectively. Importantly, these phase transition properties remained consistent over 100 thermal cycles, indicating a good cycling property. These results inform the application of metallic Al in high-temperature thermal storage.
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高影响因子
International Journal of Applied Ceramic Technology
·
2025
·
IF 2.3
Yulong Wang,Zhoufu Wang,Xitang Wang,Hao Liu,Yan Ma,Yunjie Dong,Shenghao Zeng
Short carbon fibers were treated with an ultrasonic-enhanced liquid-phase oxidation method and introduced into Al 2 O 3 -C refractories. The effects of different liquid-phase preoxidized carbon fibers on the mechanical properties and thermal shock resistance of the refractories were compared and investigated. The results indicate that ultrasonic-enhanced liquid-phase preoxidation can effectively modify the surface of carbon fibers, thereby affecting the structural evolution and usage effect of carbon fibers in Al 2 O 3 -C refractories. Appropriate liquid-phase preoxidation treatment for carbon fibers can enhance their strengthening effect on the mechanical properties of Al 2 O 3 -C refractories. After the addition of carbon fibers treated with liquid-phase preoxidation for 20 min, compared to the refractories without carbon fibers, the cold modulus of rupture, cold crushing strength, and hot modulus of rupture of Al 2 O 3 -C refractories (after 1300°C heat treatment) increased by 15.4%, 10.3%, and 36.7%, respectively. Furthermore, the introduction of liquid-phase preoxidized carbon fibers can have a positive effect on the thermal shock resistance and toughness ratio of Al 2 O 3 -C refractories.
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高影响因子
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