JOURNAL OF APPLIED POLYMER SCIENCE
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2016
·Vol. 133
·期 39
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IF 1.866
Yu Zhao,Nana Li,Fangzhu Yuan,Haiding Zhang,Shengji Xia
Zn–Al layered double hydroxide (LDH)-entrapped poly(ether sulfone) (PES) ultrafiltration membranes with four different weight percentages, 0.5, 1.0, 2.0, and 3.0%, were prepared by a phase-inversion method. Characterization by scanning electron microscopy, atomic force microscopy and contact angle (CA), equilibrium water content, porosity, average pore size, mechanical strength, and ζ potential measurement were used to evaluate the morphological structure and physical and chemical properties of membranes. Static protein adsorption, filtration, and rejection experiments were conducted to study the antifouling properties, water permeability, and removal ability of the modified membranes. The results show that significant change occurred in the membrane morphology and that better hydrophilicity, water permeability, and antifouling ability were also achieved for the PES/LDH membranes when a proper amount of LDH was used. For example, the CA value decreased from 66.60 to 50.21°, and the pure water flux increased from 80.21 to 119.10 L m −2 h −1 bar −1 when the LDH loading was increased from 0 to 2.0 wt %. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43988.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2016
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IF 4.179
Yu Zhao,Nana Li,Bin Xu,Bingzhi Dong,Shengji Xia
Hybrid poly(vinylidene fluoride) (PVDF) embedded with Zn–Al layered double hydroxides (LDH) membranes were fabricated via phase inversion. The physical and chemical properties of the novel polymer membranes were characterized using different characterizations. Filtration and antifouling experiments were performed to examine the water permeability, rejection and antifouling ability of the prepared membranes. Results showed that membrane morphology was greatly changed due to the addition of LDH and that the hybrid membrane exhibited greatly improved surface hydrophilicity, water permeability and antifouling property, with contact angle decreased from 76.5° to 69.0° and pure water (PW) flux increased from 8.01 L/m 2 h bar to 48.95 L/m 2 h bar.
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CARBOHYDRATE POLYMERS
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2025
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IF 12.5
Xin Wang,Pan Jiang,Xinjian Dai,Hao Guan,Xiaoqing Wang
Developing high-performance metal-organic framework (MOF)-based composites with high loading and uniform distribution of MOF nanoparticles is crucial for their adsorption-associated applications but remains challenging due to the lack of ideal carriers. Herein, a novel MOF-based composite was developed by in situ growth of MIL-53(Al) crystals within the carboxylated wood sponge (CWS) derived from natural balsa wood. The conversion of the cellular structure of natural wood into a lamellar structure greatly enhances the accessibility of the wood scaffold, while the introduction of carboxyl groups onto the cellulose skeleton of the wood sponge encourages the selective growth of MIL-53(Al) crystals on the lamellae of CWS. The structural features of the obtained MIL-53(Al)@CWS were investigated with FT-IR, XRD, SEM, and N 2 adsorption/desorption isotherms. The MIL-53(Al) loading can be finely tuned by adjusting the concentration of the MOF precursor solutions, and an appropriate MIL-53(Al) loading of 23 wt% results in the uniform dispersion of MIL-53(Al) crystals within the wood sponge without agglomeration. Benefiting from the high loading of MIL-53(Al) and the unique lamellar channels of CWS, the developed MIL-53(Al)@CWS can effectively adsorb various organic dyes such as rhodamine B (RhB), methylene blue, Congo red, and methyl orange in water, with a high adsorption capacity of 135.82 mg g −1 for RhB. Density functional theory (DFT) calculations reveal the detailed dynamic diffusion pathways and the molecular interactions between RhB and MIL-53(Al). This work demonstrates the advantages and potentials of lamellar wood sponges as a promising host matrix in supporting MOF powders for adsorption-associated applications.
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Journal of Environmental Chemical Engineering
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2025
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IF 7.2
Linlin Hao,Jingshuang Yan,Jiaoying Guo,Nannan Wang,Ming Zeng
Swine wastewater is a type of highly turbid wastewater with extremly high concentration of COD, NH 4 + , and total phosphorus. To address the drawbacks of commercial coagulants in the pretreatment of swine wastewater, such as loose flocs, slow settling rates, and the inability to remove NH 4 + , a novel Mg-Fe-Al hybrid magnetic coagulant (Mg/Fe/Al-MC) is prepared by using the high-pressure acid leaching (HPAL) technology based on iron tailings waste. Compared to atmospheric acid leaching (AAL), HPAL significantly increased the iron leaching rate from 22 % to 61 %. The specific surface area was increased from 5.1 to 9.2 m 2 /g. The study revealed the synergistic crystallization-coagulation-adsorption mechanism for the purification of swine wastewater. When the dosage of Mg/Fe/Al-MC was 2.5 g/L and pH was 9.0, the removal efficiency of NH 4 + reached 60 % by forming magnesium ammonium phosphate (MAP). Zeta potential results indicated that the coagulation mechanism of Mg/Fe/Al-MC is primarily based on electrostatic neutralization. After maturing Mg/Fe/Al-MC for 60 h, the content of essential polymeric Fe-Al hydroxide complexes [Fe(III)+Al(III)](b) reached 22.7 %. The insoluble porous particles exhibited a significant adsorption capacity, suggesting its important role in pollutant removal. Under the action of an external magnetic field, the settling velocity of Mg/Fe/Al-MC was significantly faster than that of polyaluminum chloride (PAC), with a much higher clear water yield of 75.5 %. This study provides new pathway for the enhanced pretreatment of swine wastewater.
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ChemCatChem
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2024
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IF 3.8
Huan Yang,Xu Wang,Haowei Wang,Ya-Dong Xie,An-Hui Lu
Graphical The Sn species doped by coprecipitation with Al precursor introduces additional acidic sites on Sn-doped alumina, which after loading with Pt species exhibits superior reactivity and stability for propane dehydrogenation. Alumina-supported PtSn catalysts have been industrialized as the major catalysts for propane dehydrogenation, where Sn serves as an essential promoter. Herein, we synthesized a variety of Sn-doped alumina supports by regulating the precipitation order of Sn and Al precursors as follows: Sn precursor precipitated before Al, coprecipitated with Al, precipitated immediately after Al, or precipitates after 2 h of Al. The effect of Sn promoter on the surface acidic properties of alumina and, ultimately, on propane dehydrogenation was further investigated. The Sn species introduced by coprecipitation in alumina created additional surface strong acid sites, attributed to more Sn 4+ species on the surface, which are able to remain stable during the subsequent treatment. Consequently, the coprecipitated Sn species in the corresponding catalyst donate more electrons to Pt and reduce the metal particle size. As a result, the catalyst with Pt supported on the coprecipitated support (Sn+Al) exhibits superior initial propane conversion (43.2%) and stability ( k d = 0.035 h −1 ). This study provides new insight into the interaction between the two key components, tin promoter and alumina support, of Pt/Sn-Al 2 O 3 catalysts.
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Molecular Catalysis
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2025
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IF 4.9
Huibin Liu,Wenhao Yang,Weilin Shen,Ying Zhong,Wenjun Zhu,Xiao Chen,Changhai Liang
The long-term scientific challenge and pursuit for semi-hydrogenation of alkynes to alkenes can be satisfied by regulating metal active centers or developing new catalytic materials. Herein, Al-Co x intermetallic catalysts are successfully prepared by reducing metal oxides using LiCl-CaH 2 composite molten salts, which are utilized for the semi-hydrogenation of phenylacetylene to styrene. The AlCo intermetallic catalyst with amorphous alumina encapsulation, resulting from the non-stoichiometric ratio feeding, exhibits significantly high styrene selectivity (83 %) at 99 % conversion of phenylacetylene under 100 °C and 0.3 MPa H 2 , which is much better than those of surface Co-rich samples and Co/Al 2 O 3 catalyst. The selectivity enhancement in phenylacetylene semi-hydrogenation is attributed to the alteration in the adsorption mode of styrene over AlCo intermetallic catalyst surface, which facilitates by the electron-rich and isolated Co active sites. Moreover, in hydrogenation of alkyne with different functional groups and steric hindrances, the corresponding alkene selectivity is similarly satisfactory, and the catalyst is easy to separate and has a stable structure. This work offers a valuable approach for tailoring the catalytic performance of intermetallic compounds formed by transition metal aluminides, and expanding their potential applications in efficient hydrogenation catalysts.
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CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Zhuxu Xu,Adelakun Moses Erinomo,Zhenhua Dan,Fengxiang Qin,Hui Chang
Accurate and sensitive surface-enhanced Raman scattering (SERS) substrates are urgently demanded for the various analytic techniques. The SERS substrates with multimodal and gradient porous structure, utilized for the Rhodamine 6G (R6G) detection, have been designed and successfully fabricated from the thermal diffusion couples of Al and Cu foils via chemical dealloying. The structural inheritance of the initial microstructure of thermal diffusion couple precursors governs the formation of the final layer-by-layer gradient porous Cu with different characteristic pore sizes and morphology. An outmost surface layer of disordered lipstick-like porous structure on the SERS substrates enhances SERS effects as has been expected. The SERS activity of R6G Raman probes on gradient porous Cu is evaluated as a SERS enhancement factor of 6.63 × 10 12 and limit of detection of 2.10 × 10 −17 mol/L, higher than other porous SERS substrates. Meanwhile, the present SERS substrates are flexible and exhibit good bending properties due to the unreacted Cu layer as a supporting skeleton and other gradient porous Cu layers. The superior SERS performances are considered to result from the synergetic effects of the surface scattering of porous Cu rods and enhancements of the high electromagnetic fields between the small gaps between the nanopores.
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ELECTROCHIMICA ACTA
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2025
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IF 5.6
Hongdi Zheng,Liuyan Zhang,Yingying Li,Binkai Yuan,Shixuan Wang,Zeyi Guan,Gengzhe Shen,Guibin Tan,Yanmei Zhang
A honeycomb-like porous self-supporting Ni-Al(G) electrode was successfully prepared by low-pressure cold spraying combined with heat treatment. The main components of the electrode were Ni and NiAl. Graphene was uniformly dispersed throughout the electrode, exhibiting a 3-D distribution, which increased the active site of electrode and improved the electron exchange rate. The electrochemical properties of the Ni-Al(G) electrode were characterized using 6 M KOH. As a result, the Ni-Al(G) electrode requires only an overpotential of 130 mV to achieve a current density of 100 mA cm −2 , and a Tafel slope of 35.5 mV dec −1 . In addition, the electrode exhibited excellent stability. The addition of graphene and the honeycomb-like porous structure of the Ni-Al(G) electrode resulted in an excellent hydrogen evolution activity. This study provides a simple and rapid technique for building high-performance, low-cost, and industrially available electrodes for the efficient alkaline HER.
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CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Shuangfu Gang,Yongxin Qian,Tianshun Xiong,You Li,Wang Li,Zheng Ma,Wenguang Zhang,Hui Long,Yingchao Wei,Xin Li,Qinghui Jiang,Yubo Luo,Junyou Yang
All-scale hierarchical defects induced by structural designing from unit cell to mesoscale play a significant role in oscillating and dissipating electromagnetic wave energy under external microwave radiation. To construct such all-scale hierarchical defects, hereby, high-entropy alloy nanoparticles coated by microscale carbon (HEA@C) with a core–shell structure were obtained by carbonizing Ni-Mn-Co-Cu-Al metal–organic. Thus, all-scale hierarchical defects were gained, including lattice distortion and nanotwins caused by the high entropy effect, vacancy and topological defects within carbon, and the heterojunction between high entropy nanoparticles and carbon. These all-scale hierarchical defects combined with the magnetic and conductive nature of HEA@C enable us to achieve a high electromagnetic wave absorption performance, with a reflection loss (RL min ) value of −52.36 dB and an effective absorption bandwidth (EAB) of 5.01 GHz. It implies that HEA@C should be an effective electromagnetic wave (EMW) absorber.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Xiaowei Wu,Yuqin Li,Yu Li,Mingyu Peng,Zhengquan Yang,Tian Gui,Xiangshu Chen,Hidetoshi Kita
Highly hydrophilic and durable Beta zeolite membranes with high aluminum (Al) spatial distribution were synthesized on inexpensive α-alumina supports via an organic template-free synthesis gel. In the absence of organic templates, the Al spatial distribution of Beta zeolite membrane crystal was regulated by the synthesis parameters such as the Al 2 O 3 /SiO 2 ratio, alkalinity, H 2 O/SiO 2 ratio and crystallization temperature, and the crystal morphology, Si/Al ratio and dehydration performance of the membrane could be further effectively controlled. Under optimal synthesis conditions, the prepared Beta zeolite membrane had an excellent separation factor of over 22,000 and a high permeation flux of 3.02 kg m −2 h −1 in the case of a 90 wt% n-butanol/water mixture at 75 °C. The high-performance Beta zeolite membrane was applied for continuous dehydration to obtain anhydrous n-butanol (99.9 wt%) from a 90 wt% n-butanol/water mixture. Furthermore, Beta zeolite membranes showed long-term acid stability in pervaporation dehydration of a 90 wt% n-butanol/water mixture with a pH value of approximately 2.0 at 75 °C for 192 h, indicating that these membranes by adjusting Al spatial distribution exhibited excellent hydrophilicity and acid resistance, which had a broad promising prospect of industrial applications for dehydration separation of acid-containing organic solvents.
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TALANTA
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2025
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IF 6.1
Xin Liu,Shiyue Niu,Bin Yang,Jia Liu,Liqian Niu,Xian Wang,Daqian Song,Shuyun Bi
Ultrasensitive Surface-enhanced Raman spectroscopy (SERS) method for the detection of diquat/dipterex was established using bovine serum albumin (BSA)-protected silver nanoparticles (AgNPs) modified MIL-53(Al) (named as BSA/MIL-53(Al)/AgNPs). Compared with unmodified AgNPs, BSA/MIL-53(Al)/AgNPs significantly enhanced the Raman signals of diquat and dipterex and the enhancement factors (EFs) were 1.58 × 10 7 and 2.34 × 10 7 , respectively. The TEM, XRD, TGA, XPS, UV–vis and FT-IR were utilized to characterize BSA/MIL-53(Al)/AgNPs and the binding of the substrate with diquat/dipterex. The optimal measurement conditions were investigated in detail by single factor experiment and response surface model. The impacts of common pesticides and coexisting substances on the determination of diquat/dipterex were studied. Under optimum conditions, linear calibration curves for detecting diquat/dipterex were established with a limit of detection (LOD) of 0.17/0.89 pmol L −1 (3 S 0 / S ). The SERS approaches were used to detect diquat and dipterex in several fruits and vegetables. The recovery was 97.10 %–104.82 % with the relative standard deviation (RSD) of 1.04 %–4.15 % ( n = 5).
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CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Meipeng Jian,Xiaoqin Yang,Congxin Huang,Chaochun Tang,Xiwang Zhang,Ruiping Liu,Haiyan Li
Flexible metal–organic frameworks (MOFs) with the gate opening feature can optimize the removal efficiency on the adsorption behavior by accommodating to the specific target molecules. In this study, a flexible MOF denoted as NH 2 -MIL-53(Al) was investigated to remove Hg(II) from water, in which the adsorption capacities of large-pore NH 2 -MIL-53(Al) (NH 2 -MIL-53(Al)-LP) for Hg(II) reached 433.20 mg/g, which is about 4 times higher than narrow-pore NH 2 -MIL-53(Al) (112.75 mg/g). Further, the kinetic experiment also revealed that nearly 90 % Hg(II) can be captured within 60 min for NH 2 -MIL-53(Al)-LP. Advanced characterizations and density functional theory calculations demonstrated that the strong coordination of the amino and oxygen centers on NH 2 -MIL-53(Al)-LP to Hg(II). Importantly, molecular dynamic simulation verified the gate opening effect of NH 2 -MIL-53(Al)-LP, as the faster diffusivity of Hg(II) ions in NH 2 -MIL-53(Al)-LP was observed. This work provides another opportunity in designing the pore geometry of porous materials for water remediation.
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