CHEMICAL ENGINEERING RESEARCH & DESIGN
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2023
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IF 3.9
Honghui Xiong,Jinglei Liu,Yongjun Zhang,Hao Wang,Enhao Sun
To reduce the coke formation, a novel Al/Si/Cr/Ce composite ceramic coating was prepared on the surface of the Cr 25 Ni 35 Nb alloy substrate by pack cementation. The microstructure, phase composition, surface morphology and element distribution of substrate and coating were characterized by X-ray diffractometer (XRD), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS). The results reveal that the outer layer of the coating forms a protective layer with a high proportion of AlN and Cr 3 Si and trace amounts of Ce. The inter-diffusion layer is mainly aluminide coating (AlNi and AlFe) and transition layer contains a small amount of AlN. The anti-coking performance of the coating was assessed using naphtha steam cracking. To study coking behavior, the morphology and microstructure of the coke layer were analyzed and characterized by SEM and Laser Micro-Raman Spectrometer. The coke layer on uncoated sample has a higher focal density and is more likely to spall and peel off when subjected to coking experiment. A large number of filamentous and granular cokes appear on the surface of the uncoated sample, whereas only less granular cokes appear on the surface of the coated sample, and the coke on the uncoated sample has a more disordered and amorphous carbon structure. The coating significantly inhibited the growth of filamentous coke and reduced coke accumulation.
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高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
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2023
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IF 8.7
Xudong Rong,Xiaofeng Chen,Dongdong Zhao,Xiang Zhang,Chunnian He,Chunsheng Shi,Naiqin Zhao
In this work, we develop a novel strategy to simultaneously manipulate robust “Al-Al 2 O 3 -CNTs” interface and intragranular nano-sized Al 2 O 3 whiskers and CuAl 2 particles in the Cu 2 O@CNTs/Al composite via combining surface modification strategy with interfacial thermite reaction, which contributes to the superior mechanical properties . It was demonstrated that the interfacial thermite reaction between Cu 2 O and Al would effectively promote the formation of Al 2 O 3 nanolayer at CNTs-Al interface, thus emphasizing to address the enhanced load transfer and interfacial plastic stability. Further, the long-distance diffusion of Cu and O atoms imposed by the intense thermal effect facilitates the in-situ generation of intragranular Al 2 O 3 /Al 2 Cu with good interface compatibility. These intragranular reinforcements could render sustainable strain hardening by trapping dislocation loops. Such interfacial thermite reaction-induced intragranular reinforcements and strong interfacial adhesion are supposed to provide a new perspective for achieving strength-ductility synergy in CNTs/Al systems.
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International Journal of Electrochemical Science
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2023
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IF 1.5
Mengli Xu,Yuan Shen,Linyu Wang,Coucong Gong,Shouhui Chen
In this work, a novel H 2 O 2 biosensor was developed based on the composites of microperoxidase-11 (MP-11) encapsulated in graphene oxide (GO)-PCN-333 (Al) (PCN stands for porous coordination network, one of the metal-organic frameworks). The PCN-333(Al) firmly and uniformly grew on the surface of GO sheet with large specific surface and excellent electrical conductivity, which provided a lots of pores for the encapsulation of MP-11 in the composites and selectively accumulated analytes into its mesopores to improve the selectivity of enzymatic reaction. The MP-11 molecules might freely move through mesopores of PCN-333 (Al) to maintain bioactivity, which remarkably enhanced the mass transfer rate and quickened the electron transfer for electrochemical biosensors. Scanning electron microscopy was used to characterize the GO and PCN-333(Al)-GO composites. Cyclic voltammetry and differential pulse voltammetry were used to characterize the electrochemical behaviors and performance of the H 2 O 2 biosensor. The target electrode showed excellent performance with a wide linear range from 10 μ M to 800 μ M, a low detection limit of 3 μ M, good stability and high selectivity, which was superior to some other H 2 O 2 biosensors.
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Journal of Environmental Chemical Engineering
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2023
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IF 7.7
Yi Liu,Dengjie Zhong,Yunlan Xu,Haixing Chang,Lin Dong,Zhuofan Han,Jun Li,Nianbing Zhong
The limited metal sites of monometallic MOFs and the high influence of pH limit their adsorption capacity. To solve these problems, La/Al bimetallic MOFs/chitosan composite was prepared by hydrothermal synthesis and impregnation methods and then characterized by XRD, FTIR, SEM, BET and XPS techniques. The doping of La has no obvious effect on the structure of Al-MOFs, but chitosan has greatly changed the structure of La/Al bimetallic MOFs. The phosphate adsorption of the composite was affected by La/Al molar ratio, chitosan/bimetallic MOFs mass ratio, temperature, phosphate initial concentration, adsorbent dosage, pH, and coexisting ions. The optimum molar ratio of La/Al and mass ratio of chitosan/bimetallic MOFs are 0.5:1 and 5.0%, respectively. The addition of La and chitosan can provide additional adsorption active sites, inhibit metal leaching, and enhance the phosphate adsorption performance, stability, and acid-alkali resistance of the composite. Its maximum adsorption capacity was 264.48 mg·g −1 . Its phosphate removal efficiency is above 90% at pH= 3.0–9.0. The actual phosphorus-containing wastewater with 7.064 mg·L −1 PO 4 3- and initial pH 7.4 can be treated to meet Chinese first-class effluent quality standard. La, Al, amino groups, and hydroxyl groups play an important role in the adsorption process of phosphate. When pH < pH pzc (4.99), phosphate is adsorbed by electrostatic gravitation between it and protonated positively charged amino and hydroxyl groups on La and Al, while when pH > pH pzc , phosphate is removed by ligand exchange between it and hydroxyl groups on La and Al. A stable, low-cost, and efficient bimetallic MOFs-based phosphate adsorbent was designed and prepared in this paper, and the results can provide reference for researchers in environmental chemical engineering .
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高影响因子
APPLIED SURFACE SCIENCE
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2019
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IF 5.155
Luhong Zhang,Ziqiang Gong,Bin Jiang,Yongli Sun,Zhenxing Chen,Xiang Gao,Na Yang
Recently, there is an urgent demand to remove oil and organic solvents with low surface tension from oily wastewater, which promotes the application of interface biomimetic materials in oil/water separation. In our work, a novel Ni Al LDHs coated superhydrophobic and superoleophilic stainless steel mesh (SS-SSM) with efficient oil/water separation performance was successfully prepared. The 3D flower-like structure intercalated by LDHs monocrystalline flakes was anchored on metallic wires in urea solution by a hydrothermal method and decorated with low surface energy molecules. The as-prepared mesh exhibited perfect superhydrophobicity with water contact angle of 156° and sliding angle of 5°, thus achieving self-cleaning property. In addition, the separation efficiency for a series of oil/water mixtures of the coated mesh was studied, which was up to 98% for most sample oils. More importantly, even treated under severer conditions such as ultrasonic , abrasion and chemical etching solution, the as-prepared meshes possessed good reproducibility in terms of contact angles and separation efficiencies. It is expected that the designed mesh could provide a b brand-new method for superhydrophobic surface coating , making it a potential functional material for self-cleaning, anti-corrosion, fluid drag reduction and oil/water separation.
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高影响因子
TEXTILE RESEARCH JOURNAL
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2019
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IF 1.613
Wei Wang,Yingchao Liang,Zhaoxu Yang,Wei Zhang,Shuo Wang
Multifunctional textiles combining ultraviolet protection, thermal insulation and superhydrophobic and aromatic performance were successfully prepared using an aluminum-doped zinc oxide (AZO)-embedded lemon microcapsule and SiO2 dual-layer coating. AZO-loaded lemon microcapsules with average diameter of 1.5 µm were obtained via interfacial polymerization. Results showed that the high concentration of the AZO-embedded lemon microcapsule contributed to enhancing the waterproof property, aromatic performance, and visible and near-infrared light transmittance. The lemon content was up to 2.789 mg/g (weight of essence:weight of fabric). The water contact angle was high at 153.35°, exhibiting an outstanding superhydrophobic performance. The light transmittance decreased as the amount of AZO-embedded lemon microcapsule increased. The ultraviolet protection factor value reached 88.78 when the dosage of the AZO-embedded lemon microcapsule was 6%. Given the above research results, the cotton fabric coated with the AZO-embedded lemon microcapsule and SiO2 dual-layer composite coating would have potential applications in the water/oil purification field and functional protective fabrics.
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高影响因子
FUEL
·
2019
·
IF 5.128
Min Zhong,Yuanyuan Guo,Jungang Wang,Congbiao Chen,Zhancheng Ma,Litao Jia,Bo Hou,Debao Li
The development of alternative to silicon carbide (SiC) holds great promise in energy and environmental related catalysis because the harsh preparation process and high cost limit its large-scale application. In this work, the core-shell structured ZnAl 2 O 4 @Al ceramic-metal composites (Zn-Al-T) are prepared from low cost metallic Al powder by a facile and environment-friendly approach to replace silicon carbide for Co-based Fischer-Tropsch synthesis (FTS, a typical strong exothermic heterogeneous catalytic reaction). The composition, thermal conductivity, surface chemical properties and pore configuration of the ZnAl 2 O 4 @Al composites can be easily modulated by controlling the calcination condition. Among Zn-Al-T composites, the Zn-Al-650 and Zn-Al-750 samples demonstrate optimum coupling of physicochemical properties, i.e., robust chemical stability, meso -macropore structure (wide mesopore and high macroporosity) and high thermal conductivity. Thus, the excellent FT performance (low CH 4 selectivity and high selectivity to C 5+ ) was obtained on the Co/Zn-Al-650 and Co/Zn-Al-750 catalysts. The heat transfer experiments were conducted on a special tubular fixed-bed reactor (I.D. = 22 mm) under near-industrial conditions. At similar reaction rates, the effective radial thermal conductivity coefficient (k eaff ) in the Co/Zn-Al-650 catalyst bed is 3–4 times and 1–2 times that in the Co/Al 2 O 3 and Co/SiC catalyst beds respectively, resulting in a more uniform temperature distribution in Co/Zn-Al-650 catalyst bed. In addition, the ZnAl 2 O 4 @Al composite has wide application prospect in strong exothermic/endothermic catalytic system owing to its high thermal conductivity, adjustable physico-chemical properties, facile preparation method and low cost.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2019
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IF 4.175
Huichang Li,Senlin Wang,Junhui Ye,Weijun Liang,Yanxiu Zhang,Jian Gu
A unique 3D hierarchical mesoporous Al-doped α-Ni(OH) 2 /reduced graphene oxide (NH/rGO) composite for supercapacitor has been successfully synthesized via homogeneous precipitation method. In this process, urea as the alkali source and mild reducing agent, to make graphene oxide (GO) convert into rGO. Thus, The NH uniformly grew on the rGO nanosheets . The as-prepared mesoporous NH/rGO composite exhibited high capacitance performance with a specific capacitance of 2558 F g −1 at the current density of 1 A g −1 , and presented good rate capability with still held 75.3% capacity at 30 A g −1 . Moreover, we used the NH/rGO as the positive electrode and the rGO aerogel as the negative electrode to assemble an asymmetric supercapacitor (ASC) device. This ACS device showed excellent specific energy of 166.97 Wh kg −1 at the power density of 0.38 kW kg −1 , and it still retains the specific energy of 100.91 Wh kg −1 under the higher specific power of 7.76 kW kg −1 . And it also displayed high rate performance and cycling durability with keeps 72% of the initial capacity after 3000 cycles (at 3 A g −1 ).
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MATERIALS & DESIGN
·
2018
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IF 4.525
Yajie Chen,Wenchao Zhang,Chunpei Yu,Debin Ni,Kefeng Ma,Jiahai Ye
NiCo 2 O 4 has been selected as an oxidizer to realize the nanothermite film for the first time in this study. The NiCo 2 O 4 /Al core-shell nanowires (NWs) thermite film has been fabricated using a facile hydrothermal-annealing synthesis method and a controllable magnetron sputtering process. The as-obtained NiCo 2 O 4 /Al NWs thermite film shows a uniform structure and distribution on the substrate, with a favorable interfacial contact between the bimetallic oxide and the fuel at the nanoscale . It is found that the quantity of Al plays a key role in the total heat release magnitude. The maximal heat release of the NiCo 2 O 4 /Al nanothermite film has reached 2076.0 J/g at the optimal Al deposited thickness of 450 nm with the obtained optimum Al/NiCo 2 O 4 molar ratio of 4.9. Moreover, this design strategy is highly compatible with microelectromechanical systems (MEMs) and it can be applied to realize other nanothermites composed by bimetallic oxide and fuel.
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高影响因子
International Journal of Environmental Research and Public Health
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2018
·Vol. 15
·期 5
·872
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IF 2.145
Yuhui Jiang,Yixuan Shang,Shuyao Yu,Jianguo Liu
Hexachlorobenzene (HCB) contamination of soils remains a significant environmental challenge all over the world. Reductive stabilization is a developing technology that can decompose the HCB with a dechlorination process. A nanometallic Al/CaO (n-Al/CaO) dispersion mixture was developed utilizing ball-milling technology in this study. The dechlorination efficiency of HCB in contaminated soils by the n-Al/CaO grinding treatment was evaluated. Response surface methodology (RSM) was employed to investigate the effects of three variables (soil moisture content, n-Al/CaO dosage and grinding time) and the interactions between these variables under the Box-Behnken Design (BBD). A high regression coefficient value (R2= 0.9807) and lowpvalue (<0.0001) of the quadratic model indicated that the model was accurate in predicting the experimental results. The optimal soil moisture content, n-Al/CaO dosage, and grinding time were found to be 7% (m/m), 17.7% (m/m), and 24 h, respectively, in the experimental ranges and levels. Under optimal conditions, the dechlorination efficiency was 80%. The intermediate product analysis indicated that dechlorination was the process by stepwise loss of chloride atoms. The main pathway observed within 24 h was HCB → pentachlorobenzene (PeCB) → 1,2,3,4-tetrachlorobenzene (TeCB) and 1,2,4,5-TeCB. The results indicated that the moderate soil moisture content was crucial for the hydrodechlorination of HCB. A probable mechanism was proposed wherein water acted like a hydrogen donor and promoted the hydrodechlorination process. The potential application of n-Al/CaO is an environmentally-friendly and cost-effective option for decontamination of HCB-contaminated soils.Keywords:nanometallic Al/CaO;ball milling;dechlorination;response surface methodology
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PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2018
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IF 3.057
Zhaohui Han,Lei Xu,Chandrasekar Srinivasa Kannan,Jianhua Liu,Sivasankar Koppala,Shaohua Ju,Libo Zhang
In this paper, an Al/TiB 2 layered composite was prepared by plasma spraying for use as the base material to reduce resistivity and improve electrochemical performance in an electrode. The β-PbO 2 coating was prepared by electrochemical deposition . Scanning electron microscopy (SEM) and X-ray diffraction (XRD) were used to study the Al/TiB 2 composite and the β-PbO 2 coating. The electrochemical performance of the Al/TiB 2 /β-PbO 2 and Ti/β-PbO 2 composites was studied by linear sweep voltammetry (LSV), Tafel polarization curves (Tafel) and electrochemical impedance spectroscopy (EIS). The results indicate that Al/TiB 2 /β-PbO 2 composite electrode materials with a uniform structure were successfully prepared by plasma spraying and electrochemical deposition. The structure of the Al/TiB 2 composite improves the conductivity of the electrode matrix, the optimal value of conductivity is 2.76 × 10 7 S m −1 , and the optimal value of density is 8.758 g cm −3 for β-PbO 2 coating. The composite also decreases the charge resistance in the double layer structure of the electrode surface, accelerating the charge transfer rate. Compared with the Ti matrix, the Al/TiB 2 /β-PbO 2 exhibited the best corrosion-resistant performance and electrochemical catalytic activity for electrowinning of nonferrous metals .
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Materials
·
2018
·Vol. 11
·期 7
·1113
·
IF 2.467
Zhe Wang,Xiaoping Shen,Temeng Qian,Kang Xu,Qingfeng Sun,Chunde Jin
The hydrophilicity and flammability of fiberboards have limited their real-life applications. In this study, a facile strategy for preparing the multifunctional coatings with superhydrophobicity and flame retardancy on medium density fiberboards (MDFs) has been investigated. The superhydrophobic and flame-retardant coating on the MDF surface was obtained by depositing polydimethylsiloxane (PDMS) and 1H, 1H, 2H, 2H-perfluorodecyltrichlorosilane (FDTS)-modified Mg/Al layered double hydroxide (LDH) particles step by step. The as-prepared coating exhibited superhydrophobic properties with a water contact angle (WCA) of ~155° and good self-cleaning properties. Furthermore, the limiting oxygen index (LOI) value of the superhydrophobic MDFs increased by 60.4% as compared to that of the pristine MDFs, showing improved flame retardancy. The peak heat release rate (PHRR) and total heat release (THR) of MDFs decreased after coating with PDMS@FDTS-Mg/Al LDH, suggesting that the superhydrophobic coating decreased the fire growth speed and risk of fire hazard of MDFs. This coating with multiple functions opens a new avenue for the protection and functionalization of MDFs.Keywords:medium density fiberboard;Mg/Al LDH;FDTS;superhydrophobicity;flame retardancy
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高影响因子
危险品化学品经营许可证（带存储）