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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JOURNAL OF CATALYSIS
·
2024
·
IF 6.5
Yun Tian,Mengqiao Gao,Zhiyang Tang,Fukun Li,Qiang Zeng,Jinxing Long,Xuehui Li
Conversion of lignin to valuable chemicals without external hydrogen presents a significative but challengeable endeavor. Herein, an efficient approach has been proposed for the lignin hydrogenolysis with in-situ hydrogen in the presence of Ni nanoparticles nested in layered double oxides (LDOs). 84.4 % conversion of lignin was achieved over 30Ni-Mg 3 Al-LDOs, affording a 21.3 % yield of monomers, and 38.0 % of which was identified as 4-ethylphenol. Catalyst characterizations revealed that this excellent performance of lignin conversion should be ascribed to the highly dispersed Ni nanoparticles, strong interfacial interactions between Ni and LDOs, and suitable basicity of catalysts. Furthermore, the roles of the solvent (1,4-dioxane aqueous solution) and the lignin methoxyl groups as hydrogen resources were distinguished, and the former acted as an initial hydrogen to promote lignin depolymerization, and the latter was responsible for the high yield of 4-ethylphenol. In addition, a plausible reaction pathway for lignin hydrogenolysis has been proposed.
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CORROSION SCIENCE
·
2024
·
IF 7.4
Teng Xu,Lei Yu,Ji-Ming Hu
Zn-Al layered double hydroxide (LDH) pretreatment layer was prepared by a novel two-step electrochemical method on galvanized steel surface from a precursor solution containing Al 3+ -only. In the first step, anodic currents are applied to Zn deposit to produce Zn 2+ in solution near the substrate surface. Cathodic currents are then applied to ensure the cathodic deposition of LDH film. The obtained LDH coatings not only provide excellent adhesion to the metal surface, but also enhance the adhesion between metal substrate and the top epoxy coatings. The “LDH/epoxy” painting system can protect galvanized steel from rusting for at least 150 days.
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INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Zhenyu Sun,Jianxiong Lyu,Ping Li,Yiqiang Wu,Xingong Li,Yingfeng Zuo
As green renewable resources, wood and its composites are widely used in the construction field, which puts forward higher requirements for their flame-retardant performance. In this study, a high-temperature hydrothermal crystallization method for in situ constructing an epoxy crosslinked Si–Al zeolite-like structural wood composite (W ZLC ) was reported. Under the action of amine guiding agents and epoxy resin, the zeolite-like catalytic structure constructed in poplar wood comprised negative electrocatalytic sites, which can efficiently catalyze the formation of the carbon layer and endow W ZLC with excellent flame retardant, smoke-suppression, and self-extinguishing properties. Compared with the untreated wood (W N ), the thermal stability of the treated wood (W ZLC ) was greatly improved, and the amount of volatile organic compounds released during the decomposition process was significantly reduced. The heat release rate, total heat release, smoke production rate, and total smoke production of W ZLC1 decreased by 50.23%, 44.14%, 45.21%, and 28.46%, respectively. Particularly, CO and CO 2 yields of W ZLC significantly decreased by 92.26% and 92.02%, respectively, indicating that the Si–Al zeolite-like catalytic structure displayed excellent catalytic flame retardant properties, which can effectively decrease the thermal decomposition rate and combustion risk of the W ZLC . This method uses less flame retardants to achieve a good flame retardant and smoke suppression effect, thereby reducing the risk of environmental pollution caused by too many flame retardants.
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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2024
·
IF 4.2
Jianlin Chen,Zihan Wu,Shu Chen,Wei Zhao,Yu Zhang,Wenxia Ye,Ruoxi Yang,Li Gong,Zhuoyin Peng,Jian Chen
Zinc oxide nanorod arrays (ZnO NRAs) have been previously introduced as electron transport layer (ETL) of perovskite solar cells (PSCs) due to their high electron mobility and unique textured morphology. However, the presence of hydroxyl and oxygen vacancies on the surface of bare intrinsic ZnO NRAs may act as defect centers leading to carrier nonradiative recombination and the device photovoltaic performance degradation. Here, we propose a mutilayer SnO 2 /Al-doped ZnO nanorod arrays/SnO 2 (SnO 2 /AZO NRAs/SnO 2 ) composite to be utilized as ETL of all-inorganic CsPbBr 3 PSCs. The influence of AZO NRAs with various Al ion (Al 3+ ) doping content on the performance of CsPbBr 3 PSCs was explored. The hole-free carbon-based CsPbBr 3 PSCs with an architecture of FTO/SnO 2 /AZO NRAs/SnO 2 /CsPbBr 3 /carbon based on 1 at% AZO NRAs exhibited the best photovoltaic performance with a champion power conversion efficiency (PCE) of 7.11 %, open-circuit voltage ( V oc ) of 1.46 V, short-circuit current density ( J sc ) of 6.88 mA/cm 2 , and fill factor ( FF ) of 71.1 %, compared with the bare intrinsic ZnO-based counterpart with a PCE of 3.45 %, V oc of 0.80 V, J sc of 8.46 mA/cm 2 , and FF of 51 %, respectively. The photovoltaic performance enhancement can be atrributed to enhanced light collection and electron extraction capability, with lower open-circuit voltage loss and more suitable interface band alighment. It is notable that the AZO NRAs were prepared by a facile electrodeposition approach to obtain large-area textured ETLs. This strategy may also be applicable to the photovoltaic performance improvemet of all types of PSCs.
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Molecular Catalysis
·
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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ChemCatChem
·
2024
·
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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Journal of Environmental Sciences
·
2024
·
IF 5.9
Kaini Ma,Kai Li,Ping Ning,Jiayu Feng,Jiacheng Bao,Lei Shi,Xiangyu Wang,Xin Sun
This study employed a wet impregnation method to synthesize five types of Cu/HZSM-5 adsorbents with Si/Al ratios of 25, 50, 85, 200, and 300, used for the removal of H 2 S in low-temperature, low-oxygen environments. The impact of different Si/Al ratios on the adsorption oxidative performance of Cu 30 /HZSM-5–85 adsorbents was investigated. According to the performance test results, Cu 30 /HZSM-5–85 exhibited the highest breakthrough capacity, reaching 231.75 mg H 2 S/g sorbent . Cu/HZSM-5 sorbent maintains a strong ability to remove H 2 S even under humid conditions and shows excellent water resistance. XRD , BET, and XPS results revealed that CuO is the primary active species, with Cu 30 /HZSM-5–85 having the largest surface area and highest CuO content, providing more active sites for H 2 S adsorption. H 2 -TPR and O 2 -TPD results confirmed that Cu 30 /HZSM-5–85 sorbent exhibits outstanding redox properties and oxygen storage capacity, contributing to excellent oxygen transferability in the molecular sieve adsorption-oxidation process. With notable characteristics such as a large surface area, high desulfurization efficiency, and water resistance, Cu 30 /HZSM-5–85 sorbents hold significant importance for industrial applications.
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PubMed
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Journal of Environmental Chemical Engineering
·
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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ANALYST
·
2011
·Vol. 137
·期 1
·133-139
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IF 3.913
Cheng-Xiong Yang,Shan-Shan Liu,He-Fang Wang,Shan-Wei Wang,Xiu-Ping Yan
Metal–organic framework MIL-53(Al) was explored as the stationary phase for high-performance liquid chromatographic separation of position isomers using a binary and/or polar mobile phase. Baseline separations of xylene, dichlorobenzene, chlorotoluene and nitrophenol isomers were achieved on the slurry-packed MIL-53(Al) column with high resolution and good precision. The effects of mobile phase composition, injected sample mass and temperature were investigated. The separation of xylene, dichlorobenzene, chlorotoluene and nitrophenol isomers on MIL-53(Al) were controlled by entropy change.
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INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Shen Zhang,Yaxian Qiao,Shiwei Luo,Bingbing He,Jingliang Xu
We reported a bifunctional site-isolated Lewis acid-Brønsted base metal-organic frameworks (NH 2 -Mo-MIL-101(Al)) for selective epimerization and isomerization of glucose to mannose and fructose. The yields of mannose and fructose were 34.09 % and 19.25 %, respectively, at 120 °C for 40 min. The sum selectivity of mannose and fructose was 95.64 %. System characterization showed that the excellent catalytic performance may attribute to the synergistic effect of Lewis acid (MoO 2 and MoO 3 ) sites and Brønsted base (-NH 2 ) sites on NH 2 -Mo-MIL-101(Al). The composition of the catalyst before and after catalysis experiment was characterized by ICP-MS. Results showed that no Mo specie was leached from NH 2 -Mo-MIL-101(Al) after 5 times re-used. 97 % of catalytic efficiency was retained after 5 times reusing compared to origin NH 2 -Mo-MIL-101(Al). The N-Mo chemical bonding between Mo active sites with NH 2 -MIL-101(Al) skeleton enhanced the hydro-stability and hydrothermal cyclic stability. Notably, 94.13 % of total sugar recovery was achieved from reaction solution by sample crystallization process without requiring chromatographic separation. High purity of glucose (91.27 %) and mannose (88.53 %) were recovered from reaction solution. This study provided a green and feasible catalytic and recovery process for industrial production of high-yield mannose and fructose from glucose.
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ELECTROCHEMISTRY COMMUNICATIONS
·
2010
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IF 4.243
Jingming Gong,Lianyi Wang,Xingju Miao,Lizhi Zhang
We developed a simple strategy for designing a sensitive electrochemical stripping voltammetric sensor for organophosphate pesticides (OPs) based on solid-phase extraction (SPE) using nanosized Pt intercalated Ni/Al layered double hydroxides (labeled as NanoPt-LDHs). By assembling NanoPt with LDHs together, the resulting NanoPt-LDHs are highly efficient to capture OPs. It dramatically facilitates the enrichment of OPs onto their surface and realizes the sensitive stripping voltammetric detection of methyl parathion (MP) as a model of OPs. The stripping analysis shows highly linear over MP concentration ranges of 0.001–0.15 and 0.3–1.0 μg mL − 1 with a detection limit of 0.6 ng mL –1 (S/N = 3). The combination of NanoPt, LDHs, SPE, and square-wave voltammetry (SWV) provides a fast, simple, and sensitive electrochemical method for OPs.
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