查找使用阿拉丁产品的科研文献

Dual-mode fluorescence and colorimetric immunosensing platform based on Au/Pt NPs@NH2-MIL-53(Al) composite for effective detection of enrofloxacin in animal-derived foods

Hongbo Li,Hao Wang,Meiyi Cao,Xing Tong,Shuo Wang,Mingfei Pan

The fluoroquinolone-enrofloxacin (ENR) residue in animal-derived foods poses a significant threat to human health, thereby necessitating developing precise, efficient, and user-friendly detection methods. This study developed a dual-mode fluorescence-colorimetric immunosensing platform using the composite of bimetallic nanoparticles integrated with metal-organic frameworks (Au/Pt NPs@NH 2 -MIL-53(Al)). The Au/Pt NPs with biocompatibility and peroxidase-like activity were modified onto fluorescent NH 2 -MIL-53(Al) and conjugated with Ab 2 to construct signal probes. The platform enables dual-mode quantitative analysis through the competitive binding of ENR and ENR-BSA conjugate to signal probes. It demonstrated a wider linear range (0.08–180 ng/mL) and high sensitivity [LOD: 0.068 ng/mL (fluorescence), 0.066 ng/mL (colorimetric), and 0.074 ng/mL (smartphone-assisted color recognition)]. In real sample analyses, the recoveries ranged from 86.7 % to 106.7 %, with satisfactory stability (RSD ≤ 4.4 %, n  = 3). The dual-signal mode facilitates results self-calibration, enhancing reliability, while smartphone-assisted color recognition enables on-site, convenient screening, offering great potential for ENR detection in complex food matrices.

Molecular insight into DOM fate using EEM-PARAFAC and FT-ICR MS and concomitant heavy metal behaviors in biologically treated landfill leachate during coagulation: Al speciation dependence

Libing Liu,Lei Du,Sen Lu,Bo Yang,Xu Zhao,Deli Wu,Xunchang Fei,Hongping He,Dongsheng Wang

Various combined processes with pre-coagulation have been developed for biologically treated landfill leachate , but the microscopic-level processes occurring during coagulation remain largely unknown. Herein, dissolved organic matter (DOM) fate using fluorescence excitation emission matrix spectroscopy combined with parallel factor analysis and electrospray ionization coupled Fourier transform-ion cyclotron resonance mass spectrometry and concomitant heavy metal (HM) behaviors were explored at the molecular level. In addition, AlCl 3 and two polyaluminum chloride (PACl) species (dominated by [AlO 4 Al 12 (OH) 24 (H 2 O) 12 ] 7+ and [(AlO 4 ) 2 Al 28 (OH) 56 (H 2 O) 26 ] 18+ , respectively) were used. The results show that all coagulants are efficient at removing DOM. PACl was found to be advantageous over AlCl 3 in overcoming pH fluctuation, which is ascribed to the different dominant mechanisms, namely, entrapment and sweep flocculation for AlCl 3 and charge neutralization for PACl. Consequently, PACl was more effective at removing humic substances , usually high-molecular-weight, oxygen-rich and unsaturated, than protein substances. For HM removal, PACl was likewise better and more stable, where As, Cu, Ni, Co and Hg were removed predominantly via adsorption, and Cr, Zn, Pb, Cd and Mn were removed via coprecipitation . Correlation analysis showed that humic substances tended to complex with HMs and be removed synergistically due to the ubiquitous occurrences of aromatic structures and oxygen-containing functional groups.

Selective separation of Al, Fe, and Ti from red mud leachate by Fe-Ti iso precipitate flotation and reduction hydrolysis process: Ions selective chelation and separation mechanism

Yizhuang Wang,Bingbing Liu,Hu Sun,Yanfang Huang,Guihong Han

Bauxite residue (red mud) is a typical solid waste discharged from the aluminum metallurgy industry and can be considered as an alternative resource for the recovery of iron (Fe), aluminum (Al), and titanium (Ti). Acid leaching is an effective technique for the simultaneous extraction of valuable metals from red mud, whereas the leachate with various metals confronts the difficulty of metals separation. In this work, a selective separation and recovery of Fe, Al and Ti from red mud leachate by the preferential Fe-Ti iso precipitate flotation followed by a reduction-hydrolyzation process was proposed. In the iso precipitate flotation process, the cupferron was acted as an Fe-Ti synchronous chelation agent and hexadecyl trimethyl ammonium bromide (CTAB) was used as an anionic collector for the flotation separation of Fe-Ti chelate. The generated fine hydrophobic chelates are rapidly separated from solution by flotation with the assistance of CTAB, in which 99.3% Fe and 99.8% Ti were transferred into the flotation product, while 96.7% Al remained in the leachate, realizing the first separation of Al. Reduction-hydrolyzation was further conducted to separate Ti and Fe from the dissolving solution of the flotation product. Hydrolysis thermodynamic analysis indicated that the required hydrolysis pH range of Fe 2+ was much different from that of TiO 2+ and Ti 3+ . After selective reduction of Fe 3+ to Fe 2+ by KI, 99.8% Ti was concentrated in the residue while 94.8% Fe remained in the solution. Eventually, the comprehensive recoveries of Fe, Ti, and Al are 94.1%, 99.7%, and 96.7%, respectively.

Effect of the acid used in the evaporation-induced self-assembly method on Ce–Cu–Al trimetallic composite catalyst for its simultaneous removal of H2S and PH3

Yingwu Wang,Qiang Lin,Ping Ning,Chi Wang,Heping Zeng,Xin Sun,Xin Song,Kai Li

H2S and PH3, which are ore-thermal furnace gases, are harmful to humans and the environment. Here, the performance of a catalyst, Ce–Cu–Al trimetallic composite catalyst, is further explored by examining the influence of the used acid. The effects of acids on the structural features, surface functional groups, and activity of the catalysts were examined. Test results showed that the catalyst fabricated using 71.7 mmol nitric acid performed the best, and its capacity reached 229.8 mg g−1 (H2S) and 201.9 mg g−1 (PH3). Besides, SEM and TEM showed that the whole structure of catalysts was sharply changed by the species of the acid used, which was caused by the different combinations of components in the catalyst system. Because of the change in the catalyst structure, their physical and chemical properties are also adjusted. Using nitric acid could endow the catalyst with better properties, such as the best specific surface area, higher total pore volume, the strongest acid center, and the best reducing power. Combining the analysis results of FTIR spectroscopy, it was found that the detailed functional groups of NH2− and νON played a role in the reaction.

Efficient Activation of Coal Fly Ash for Silica and Alumina Leaches and the Dependence of Pb(II) Removal Capacity on the Crystallization Conditions of Al-MCM-41

Xu Zhang,Tao Du,He Jia

In this study, four different coal fly ashes (CFAs) were used as raw materials of silica and alumina for the preparation of the alumina-containing Mobil Composition of Matter No. 41 (Al-MCM-41) and the exploration of an activation strategy that is efficient and universal for various CFAs. Alkaline hydrothermal and alkaline fusion activations proceeded at different temperatures to determine the best treatment parameters. We controlled the pore structure and surface hydroxyl density of the CFA-derived Al-MCM-41 by changing the crystallization temperature and aging time. The products were characterized by small-angle X-ray diffraction, nitrogen isotherms, Fourier-transform infrared spectroscopy,29Si silica magic-angle spinning nuclear magnetic resonance, and transmission electron microscopy, and they were then grafted with thiol groups to remove Pb(II) from aqueous solutions. This paper innovatively evaluates the CFA activation strategies using energy consumption analysis and determines the optimal activation methodology and parameters. This paper also unveils the effect of the crystallization condition of Al-MCM-41 on its subsequent Pb(II) removal capacity. The results show that the appropriate selection of crystallization parameters can considerably increase the removal capacity over Pb(II), providing a new path to tackle the ever-increasing concern of aquic heavy-metal pollution.Keywords:coal fly ash;CFA activation;Al-MCM-41;crystallization parameters;Pb(II) removal capacity

Cu/SSZ-13 zeolites prepared by in situ hydrothermal synthesis method as NH3-SCR catalysts: Influence of the Si/Al ratio on the activity and hydrothermal properties

Han Jiang,Bin Guan,He Lin,Zhen Huang

This study focuses on investigating the influence of Si/Al ratio on the performance of hydrothermally aged Cu/SSZ-13 catalysts prepared by in situ hydrothermal synthesis method. It was found that NH 3 -SCR performance and hydrothermal stability of Cu/SSZ-13 decreased with increasing Si/Al ratio. Fresh and hydrothermally aged Cu/SSZ-13 with Si/Al ratio of 6.5 showed the best SCR activity and N 2 selectivity in a broad temperature of 200–500 °C, in which more than 90% NO x was reduced with superior N 2 selectivity above 95%. The effect of Si/Al ratio on the properties of the physicochemical structure, the change of acidity intensity, and Cu species migration or transformation of the fresh and aged Cu/SSZ-13 catalysts were comprehensively characterized by NH 3 -TPO, NH 3 -TPD, H 2 -TPR, N 2 physisorption, XRD, ICP-AES, and XPS. The increase of the surface CuO species, the decrease of the amount of Cu 2+ in active sites, the chemisorption NH 3 species, the specific surface area, the total pore volume, and the increase of average pore diameter, may be the main reasons for performance deterioration over high-Si/Al-ratio catalysts after hydrothermal aging. Furthermore, in situ DRIFTS indicate that, with the increasing Si/Al ratio, the zeolitic structure was easy to collapse, and that the surface acid sites, the active copper species, as well as the adsorbed surface nitrate, decreased after hydrothermally aged. After hydrothermal aging, the amount of isolated Cu 2+ decreased, and more CuO species were aggregated, mainly coming from the conversion of the unstable isolated Cu 2+ species in D6R or CHA cages. The decrease of isolated Cu 2+ and CuO species aggregation were significant in Cu/SSZ-13 with high Si/Al ratios. The CuO leaded to the instability of the SSZ-13 skeleton structure and NH 3 oxidation promotion, resulting in catalysts deactivation.

Reply to Hosseini Monjezi, B.; Lützenkirchen, J. Comment on “Zhou et al. Adsorption Behaviors of Lanthanum (III) and Yttrium (III) Ions on Gibbsite. Minerals 2023, 13, 1530”

Zongke Zhou,Quan Wan,Wenbin Yu,Xin Nie,Shuguang Yang,Shuqin Yang,Zonghua Qin

Boride-derived catalysts for hydrogen evolution: Precursor-controlled reconstruction toward M-Co(OH)2 and M-Ni(OH)2 active phases and their application in Al-H2O batteries

Chen Chen,Zhenyu Wang,Yasen Li,Jiayao Gao,Xin Chen,Mingjie Jia,Die Shao,Yiming Wang,Xuejian Li,Fuqiang Yu,Guangwen Xu,Junli Xu,Hong-bin Sun

Transition-metal borides have long been developed as promising electrocatalysts for the hydrogen evolution reaction (HER); however, the identity of their true active phase remains controversial. Here, in conjunction with our previous studies, by systematically investigating a series of cobalt- and nickel-boride-derived catalysts through a combined computational and experimental screening, we reveal that HER activity universally originates from the synergistic interaction between metallic sites and hydroxide matrices, enabled by lattice expansion, interfacial electronic transfer, and dynamic surface evolution. As a representative high-performance example, Pt-modified Co(OH) 2 derived from cobalt boride exhibits ultralow overpotentials of 11 mV at 10 mA cm −2 and 95 mV at 500 mA cm −2 , together with long-term stability. Importantly, the same reconstruction principle applies to Ni-boride systems, confirming the generality of this approach. Beyond water electrolysis, we further demonstrate that these HER catalysts are highly effective in Al-H 2 O batteries, where hydrogen evolution is coupled with electrical energy harvest. An alkaline Al-H 2 O battery employing the reconstructed catalyst delivers a power density of 21.96 mW cm −2 . This work establishes that the activity of “boride-based” HER catalysts fundamentally arises from reconstructed metal-hydroxide active centers, providing a development paradigm of transition-metal electrocatalysts.

One-Pot Tandem Butanolysis and Hydrogenolysis of PET to Selectively Produce p-Xylene through Coordination of Basic Sites, Oxygen Vacancies, and Hydrogenation Sites of Cu–Mg–Al Catalyst

Mingzhu Guo,Yuewen Shao,Chengsen Song,Hao Liu,Fei He,Lijun Zhang,Shu Zhang,Tao Wei,Xun Hu

Upcycling polyethylene terephthalate (PET) plastic into high-value chemicals like p-xylene is challenging, due to the difficulty for achieving selective depolymerization of PET and deoxygenation of reaction intermediates. Herein, a tandem alcoholysis-hydrogenation/hydrogenolysis strategy for converting PET to p-xylene over Cu-based catalysts using n-butanol as both solvent and reactant at 205 °C was conducted using Mg-modulated Cu-based catalysts derived from layered double hydroxides. By precisely tuning the Mg/Al molar ratio, the multidimensional synergistic roles of Mg in enhancing the catalyst performance were unraveled, which serves as the core of heterogeneous PET depolymerization. Specifically, Mg reinforces metal–support interactions, confining Cu nanoparticles to an average size of 4.8 nm, which is far smaller than the 14.1 nm observed in Mg-free Cu1.0Al2.0, maximizing accessible active sites and accelerating the rate-determining step of PET butanolysis. Mg also induces pore coarsening to form a hierarchical mesoporous architecture, eliminating steric hindrance for the rapid diffusion of bulky PET oligomers. Moreover, Mg enriches surface basic sites (critical for ester bond cleavage, as confirmed by acid–base titration) and induces oxygen vacancies (promoting carbonyl adsorption and deoxygenation via in situ FT-IR). The optimized catalyst exhibits a low apparent activation energy (49.6 kJ/mol) and high p-xylene yield (99%), with exceptional recyclability by suppressing Cu sintering.

Defect Engineering of a d-p Orbital Hybridized Osmium/o-CNTs Heteroelectrocatalyst with an Optimized Interfacial Water Structure for Hydrogen Evolution within an Al | OH– | H2 Primary Cell

Lin Wei,Yang Zhibin,Tao Jin-Gang-Lu,Zhao Qianqian,Liu Fuyu,Li Wanshan,Feng Renfei,Zhang Yu,Fu Xian-Zhu,Luo Jing-Li,Zhao Bin

Developing efficient and durable electrocatalysts for alkaline seawater hydrogen evolution remains challenging because of sluggish water dissociation kinetics. Herein, we report a defect-rich d-p orbital-hybridized Os/o-CNTs electrocatalyst ( dph -Os def /o-CNTs) prepared by rapid room-temperature NaBH 4 reduction. The partially oxidized CNT support anchors defective Os nanoclusters and induces C–Os/C–O–Os electronic coupling, generating electron-deficient Os sites with modulated 5d electronic structures. In alkaline simulated seawater (1 M NaOH + 3.5 wt % NaCl), dph -Os def /o-CNTs requires only 91 mV to reach 100 mA cm –2 and exhibits a Tafel slope of 19 mV dec –1 , with stable operation over 350 h and 10,000 CV cycles. In situ Raman spectroscopy, AIMD simulations, and DFT calculations reveal that Os vacancies reorganize interfacial water into an ordered H-bond network, promote O-down water adsorption, and reduce the water dissociation barrier from 1.12 to 0.56 eV. Moreover, an Al | OH – | H 2 primary cell using dph -Os def /o-CNTs as the cathode delivers 1.41 V and 10.92 mW cm –2 , enabling simultaneous hydrogen generation and electricity output.

Wheat leaf-inspired Al-based hydrophobic composite with superior photothermal/electrothermal conversion enables real-time passive and active anti-icing/deicing of automotive vehicle and the process intensification

Di Zhang,Chuandian Zhang,Yang Xin,Kai Yue,Zhixiong Han

Ice formation and accretion exert a negative effect, creating an urgent demand for effective anti-icing/deicing methods. Inspired by the natural hydrophobic structure of wheat leaves, a three-step strategy, involving laser etching, carbon nanotubes spraying, and polydimethylsiloxane modification, was proposed and the process intensification was systematically investigated both by experiment and numerical simulation. It suggested that this multifunctional composite presented integrated anti-icing, photothermal deicing and electrothermal deicing functions, realizing real-time anti-icing/deicing. It achieved a water contact angle of 146° and an ice adhesion force of as low as 0.83 N, ensuring that the icing delay time was significantly prolonged from 81 s to 1203 s. The composite reached to ca. 62 °C under 1.8 sun illumination, and the photothermal deicing time was reduced by ca. 80%. The surface temperature attained ca. 89 °C at as low as 1.8 V, with the electrothermal deicing efficiency enhancing by ca. 50%. After 20 freeze-thaw cycles and ultraviolet irradiation, no obvious degradations in the surface hydrophobicity and photothermal/electrothermal conversion performances were observable. Meanwhile, this composite possessed excellent self-cleaning capability to resist the dust contamination. The experimental results were also confirmed by numerical simulation, and the simulated results were in high accordance with the experiment data. The process intensification during anti-icing/deicing was found, and the low ice adhesion force was responsible for the process intensification. Integrating the advantages of passive anti-icing and active photothermal/electrothermal deicing, this composite overcomes the drawbacks of conventional anti-icing/deicing technologies, such as high energy consumption, single function, and poor stability, etc., presenting promising prospect for the anti-icing/deicing of Al-based material of automotive vehicle.

Effect of poly(AMPS/DMAA/IA/SSS) intercalated Mg/Al layered double hydroxides on reducing fluid loss at 240 °C and improving early strength of oil well cement

Qinglu Chang,Guoqing Liu,Zhanpeng Dong,Xia Miao,Miaomiao Hu,Jintang Guo

Fluid loss agent (FLA) was adopted to reduce the fluid loss of cement paste to ensure the safety of cementing construction. With the increase of exploration depth, FLA applied at high temperatures has been urgently required. To meet the cementing requirements at 240 °C, the FLA with organic/inorganic intercalated microstructure was prepared. Anionic polymer FLA (ADIS) was comprised of 2-acrylamido-2-methylpropane sulfonic Acid (AMPS), N , N -dimethylacrylamide (DMAA), Itaconic acid (IA) and Sodium p-styrene sulfonate (SSS). The organic-inorganic hybrid FLA (MgAl-ADIS-LDH) was prepared via intercalating ADIS into Mg/Al hydrotalcite (MgAl-NO 3 -LDH) interlayers . The intercalated microstructure was observed by SEM , TG results exhibited that the intercalation of polymer ADIS in MgAl-NO 3 -LDH enhanced the thermal stability of overall FLA. When applied in cement, the cement with MgAl-ADIS-LDH showed a small water loss of 36 mL at 240 °C. Moreover, the structure avoided the decrease in the compressive strength of hardened cement resulted from traditional polymer FLA. Compared with the cement contains 1.6% bwoc ADIS, the compressive strength of specimen with MgAl-ADIS-LDH increased by 20.5% after cured for 3 days.