ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2019
·Vol. 411
·期 7
·1375-1381
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IF 3.286
Sun Chongmei,Shen Jin,Cui Rongwei,Yuan Fangzheng,Zhang Hui,Wu Xia
A sensitive fluorescent analytical method for the detection of dopamine (DA) was developed based on surface-enhanced Tb(III)/La(III) co-luminescence using silver nanoflowers (AgNFs). Anisotropic AgNFs show strong surface-enhanced fluorescence effect owing to the abundant sharp tips. Tb(III)/La(III)-DA complexes mainly bind to the sharp tips of AgNFs and thus shorten the distance between the complexes. The shortened distance gives rise to obvious surface-enhanced Tb(III)/La(III) co-luminescence effect. In this work, AgNFs offer many superior properties, such as enhanced intrinsic green fluorescence of Tb(III) ( λ ex / λ em = 310/546 nm), increased fluorescence lifetime, and improved energy transfer efficiency. Under the optimum conditions, the fluorescence intensity is linearly correlated with the concentration of DA in the range of 0.80–10 nM ( R 2 = 0.9970), and the detection limit is 0.34 nM ( S/N = 3). The fluorescent nanoprobe was successfully applied to the determination of DA in human serum samples with recoveries ranging from 99.1 to 102.6%.
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ACS Catalysis
·
2018
·
IF 11.384
Xiaoqin Sun,Yongli Mi,Feng Jiao,Xiaoxiang Xu
Solar water splitting into H2 and O2 upon a particulate photocatalyst relies on significant advances in material engineering where a number of important properties such as optical absorption, charge transportation, defect level, etc. can be manipulated. In this work, we have gained control over these properties for the wide band gap semiconductor Sr2TiO4 and successfully actualized water splitting under visible light illumination. This has been realized by codoping La/N into the laminated perovskite structure of Sr2TiO4. Strong visible light absorption as far as 650 nm can be tailored by varying the La/N content in Sr2–xLaxTiO4–yNy (0 ≤ x ≤ 0.5). Optimal photocatalytic H2 and O2 production has been achieved at x = 0.2, 0.3 and outweighs that of a number of typical perovskite oxynitrides. These activities are a function of several important parameters for photogenerated charges (e.g., concentration, mobility, and lifetime) which are all linked to La/N codoping levels. More strikingly, overall water splitting has been achieved at x = 0.2 with Rh/Cr2O3 as a cocatalyst. Defects such as Ti3+ species play a negative role in the photocatalytic activity, as they strongly promote charge recombination and shorten the electron lifetime. Theoretical calculations reveal the crucial role of N in uplifting the valence band maximum of Sr2TiO4 by hybridization with O 2p orbitals. La, therefore, balances the charge discrepancies induced during N/O replacements which would otherwise be unfeasible for substantial doping. Our calculations also suggest that Sr2TiO4 has a 2D charge transportation character which is extremely useful for charge separations.
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2017
·
IF 4.784
Ying Wu,Yuelin Wei,Qiyao Guo,Hui Xu,Ling Gu,Feiyue Huang,Dan Luo,Yunfang Huang,Leqing Fan,Jihuai Wu
A series La-doped WO 3 /SrTiO 3 heterojunctions photocatalyst were successfully prepared using solvothermal method . The as-fabricated heterostructures composite included La-doped WO 3 fluff spheres tightly grew on the surface of SrTiO 3 cubic particles. The crystallanity, structural, morphological and optical features of the catalysts were characterized using several techniques including XRD , XPS , SEM, TEM UV−vis and HRTEM. The photocatalytic activity of the heterojunction was evaluated by the photocatalytic degradation of methyl orange (MO) under visible-light irradiation. The influence of La doping and SrTiO 3 molar ratio on heterojunctions photocatalysts was investigated. Among the as-prepared photocatalysts, the LWS50 sample exhibited the highest photocatalytic activity , almost 100% MO were completely decomposed within 75 min under visible light irradiation (λ > 420 nm). Compared with the pure WO 3 and SrTiO 3 , the enhancement of photocatalytic activity was mainly attributed to the three-dimensional hierarchical structure and the effectively transfer and separation of photogenerated electron–hole pairs in La doped WO 3 and SrTiO 3 heterojunctions
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FOOD CHEMISTRY
·
2024
·
IF 8.5
Peng Zhao,Xuhui Xia,Jia Zheng,Zirui Yuan,Yiyao Luo,Huibo Luo,Yi Ma,Danqun Huo,Changjun Hou
The correct classification of strong-flavored crude baijiu affects its quality and overall standard and is crucial for the intelligent development of the baijiu industry. In this work, we developed a novel optical sensing array using lanthanum-doped carbon dots (La-CDs). Using La-CDs with three metal complex dyes—chromium black T, alizarin red, and dimethylphenol orange—we were able to detect organic acids and tannic acid (TA) in crude baijiu in a way that was both colorimetric and fluorescent for the first time. Based on the indicator displacement (IDA) principle, organic acids competitively replace the dyes' binding sites on La 3+ , causing the dye colors to change to varying degrees. TA quenches the fluorescence of quantum dots through an internal filtering effect. We analyzed the data using pattern recognition algorithms such as HCA, PCA, and LDA, successfully classifying and identifying 16 types of strong-flavored crude baijiu, which included 10 types of carboxylic acids and various grades. In blind tests of 32 crude baijiu samples, the colorimetric method achieved a 94 % accuracy rate, while the fluorescence method achieved 100 %. The sensor demonstrates significant advantages in response speed.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2014
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IF 6.007
Moa Z. Granlund,Kjell Jansson,Marita Nilsson,Jazaer Dawody,Lars J. Pettersson
The objective of this paper was to study the influence three promoters (Co, La, Mn) had on the catalytic activity of Rh-based catalysts for autothermal reforming of diesel. The catalysts were supported on CeO 2 -ZrO 2 and the loading was 1 wt.% Rh and 6 wt.% promoter. The catalytic activity was evaluated in a monolith bench scale reactor with Swedish Environmental diesel, MK1. The process parameters employed at the ATR experiments were; O 2 /C ∼ 0.45, H 2 O/C ∼ 2.5 and GHSV ∼ 50,000 h −1 , meanwhile the reactor temperature was ramped from 700 °C to 950 °C. The catalysts were compared based on their fuel conversion, H 2 yield and the selectivity of different short-chain hydrocarbons. The results showed that all three catalysts had both high fuel conversion and H 2 yield in the optimal ATR operation temperatures. The H 2 yield and fuel conversion were increasing in the order Rh/Mn, Rh/La, Rh/Co. To get further insight in the difference between the materials the fresh and aged catalytic materials were characterized. The characterization methods used were H 2 -temperature programmed reduction (H 2 -TPR), powder X-ray diffraction (XRD), and BET surface measurements. The BET surface measurements showed that promotion with La gave improved thermal stability of the material. The XRD showed a high dispersion of all metals except Co, which was present as crystals in the size range of the particles of the support.
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ChemistrySelect
·
2025
·Vol. 10
·期 10
·e202500263
·
IF 2
Liang Zhang,Jiahao Qian,Xinyuan Zhang,Yanwei Lv,Jiulong Zhao,Shige Wang,Hao Xu
Graphical The dual-responsive polypyrrole-2,2'-Azobis(2-methylpropionamidine) dihydrochloride (AIPH)@Lauric acid nanoplatform integrates polypyrrole for photothermal therapy and AIPH for thermodynamic therapy, achieving synergistic colorectal cancer treatment. Under near-infrared irradiation, the system enables precise, oxygen-independent radical generation, enhancing tumor inhibition with minimal toxicity. This study highlights the platform's potential for minimally invasive cancer therapy. In this study, we introduce a novel nanoplatform, polypyrrole (PPy)-2,2′-Azobis[2-(2-imidazolin-2-yl)propane] dihydrochloride (AIPH)@lauric acid (LA) (PPy-AIPH@LA) nanoparticles (NPs), designed to overcome these limitations through synergistic photothermal therapy (PTT) and photodynamic therapy (PDT). This dual-responsive system incorporates PPy for efficient photothermal conversion, AIPH for thermos-responsive and oxygen-independent free radical generation, and LA as a thermally responsive encapsulation layer. The LA coating melts upon 808 nm near-infrared laser irradiation, releasing AIPH and free radicals to enable precise spatiotemporal activation of therapeutic effects. PPy-AIPH@LA demonstrates exceptional photothermal conversion efficiency (55.74%) and generates sufficient radicals to enhance PDT efficacy, even in hypoxic tumor microenvironments. In vitro studies revealed concentration-dependent tumor cell ablation and inhibition of migration, while in vivo experiments showed that the combined PTT-PDT treatment achieved an impressive 90.7% tumor growth inhibition rate in a mouse colon cancer cells CT-26 murine model, with no significant systemic toxicity. Molecular analyses further revealed modulations in pathways associated with tumor metabolism, apoptosis, and immune escape, highlighting the comprehensive therapeutic potential of this nanoplatform. These findings underscore the potential of PPy-AIPH@LA as a safe, effective, and minimally invasive nanotherapeutic platform for combating CRC and other solid tumors.
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RARE METALS
·
2024
·
IF 9.6
Wan Si-Jie,Hou Yan-Ting,Wang Wang,Luo Guo-Qiang,Wang Chuan-Bin,Tu Rong,Cao Shao-Wen
Photocatalytic reduction of CO 2 has attracted considerable interest owing to its potential to resolve the energy and environmental problems. Nevertheless, the lack of proficient photocatalysts has restricted the application of solar-driven photocatalytic CO 2 reduction. Herein, we reported an S-scheme heterojunction by combining g-C 3 N 4 with La 3+ and Rh 3+ co-doped SrTiO 3 through the electrostatic self-assembly method for the efficient photocatalytic CO 2 reduction. In comparison with g-C 3 N 4 , the as-prepared CN/LRSTO-30 wt% S-scheme heterojunction not only possesses a broadened visible-light response due to the defect states in La, Rh co-doped SrTiO 3 induced by co-doped La 3+ and Rh 3+ but also has more adsorption sites for the capture and activation of CO 2 molecules. Additionally, separation and transfer efficiency of the photoinduced charge carriers is much enhanced in the CN/LRSTO-30 wt% S-scheme heterojunction via its robust internal electric field, which is firmly demonstrated by in situ irradiation X-ray photoelectron spectroscopy technology. Consequently, the prepared S-scheme heterojunction achieves impressive photocatalytic CO 2 reduction performance with an average CO and CH 4 evolution rate of 4.1–1.8 μmol·g −1 ·h −1 , respectively, which are ~ 1.9 and ~ 22.5-fold higher than those of pure g-C 3 N 4 . This study provides innovative perspectives on the design of creative S-scheme heterojunctions for applications in photocatalytic CO 2 reduction. Graphical abstract
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Dongmin An,Jialun Dai,Yingyue Wang,Mengying Long,Hua Cai
In this work, a simple one-step hydrothermal synthesis of La doped SnO 2 nanocomposites was studied. The structure, morphology, specific surface area, and chemical composition were determined by XRD , SEM, BET, and XPS techniques. The gas sensing performance of SnO 2 and La/SnO 2 nanocomposites with varied La doping dosages on n-butanol gas was systematically investigated. The results manifested that under the testing environment (50 % relative humidity and 30 °C), La doped SnO 2 nanocomposite sensor presented high response (69), excellent selectivity, good repeatability and long-time stability to n-butanol gas at 160 °C. Especially, the 7 mol% La doped SnO 2 sensor displayed a 5.9 times higher response to 50 ppm n-butanol than the SnO 2 sensor. In comparison with bare SnO 2 , La doping increased the band gap value of 7 mol% La/SnO 2 nanocomposite by 6.23 %, decreased particle size by 11.83 %, and increased the oxygen defect concentration by 6.07 %. Due to the synergistic effect of the above factors, the gas sensing performance of La doped SnO 2 nanocomposites towards n-butanol gas was enhanced. Therefore, La doped SnO 2 nanocomposites might be a potential gas sensing material for monitoring n-butanol gas at relatively high humidity.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Lihua Feng,Yufan Xia,Jinze Guo,Huiling Liu,Youchen Hao,Ziqi Tian,Xin Xiao,Lijie Feng,Chujun Sun,Shunmian Qi,Kuoqin Li,Yong Li,Yinzhu Jiang
Despite the considerable potential of O3-type layered oxide cathodes in sodium-ion batteries due to their high theoretical capacities, the rapid capacity degradation caused by high Na + diffusion barriers and irreversible phase transitions seriously hampers their practical application. Herein, we propose the La-doping strategy in O3-type layered oxide to decrease diffusion barriers and strengthen transition metal–oxygen (TM-O) bonds, thereby significantly improving the electrochemical performance. The strong La-O bonding facilitates highly reversible O3-P3 phase transitions during (de)sodiation and enhances the stability of lattice oxygen at high voltages. Specifically, the La-doped O3-type oxide exhibits impressive cycling stability, with the capacity retention increasing from 63 % to 80 % after 500 cycles at 1C. The full cell assembly with La-doped oxide as cathode and hard carbon as anode demonstrates a high energy density of 323.7 Wh kg −1 at 0.1C, with a capacity retention of 74.6 % after 300 cycles at 1C. This work provides new insights in La-doping to promote the commercial application of O3-type cathodes for sodium ion batteries.
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JOURNAL OF RARE EARTHS
·
2025
·
IF 7.2
Lihua Hu,Suning Zhang,Peishen Zhao,Jie Yang,Gongde Wu,Wei Xu
The catalytic direct synthesis of dimethyl carbonate (DMC) from CO 2 and methanol is a crucial approach to utilizing CO 2 and producing high-value chemicals. However, the high stability of the CO 2 molecule imposes thermodynamic limitations on this reaction pathway, along with challenges related to insufficient catalyst activity and stability. Currently, solutions primarily focus on developing efficient catalyst. Herein, La-doped CeO 2 nanoflower catalysts (La x CeO 2 ) were synthesized via hydrothermal method. Characterization reveals that La doping optimizes the pore structure and enriched oxygen vacancies, thereby enhancing catalytic performance. Notably, La 0.1 CeO 2 exhibits the largest pore size and highest oxygen vacancy content, achieving a remarkable DMC productivity of 9.42 mmol/g under 140 °C, 4 MPa of CO 2 , and 3 h of reaction, surpassing pure CeO 2 nanoflowers. Based on experimental findings and in-situ diffuse infrared Fourier transform analysis, a plausible reaction pathway was proposed. This work underscores the potential of La x CeO 2 nanoflowers as efficient catalysts for sustainable CO 2 conversion to DMC.
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International Journal of Minerals Metallurgy and Materials
·
2025
·Vol. 32
·期 3
·645-656
·
IF 7.2
Wang Long,Liu Jiurong,Xie Shenghui,Deng Yanli,Wang Zhou,Hou Shanyue,Yue Shengying,Wang Gang,Wu Na,Zeng Zhihui
W-type barium–nickel ferrite (BaNi 2 Fe 16 O 27 ) is a highly promising material for electromagnetic wave (EMW) absorption because of its magnetic loss capability for EMW, low cost, large-scale production potential, high-temperature resistance, and excellent chemical stability. However, the poor dielectric loss of magnetic ferrites hampers their utilization, hindering enhancement in their EMW-absorption performance. Developing efficient strategies that improve the EMW-absorption performance of ferrite is highly desired but remains challenging. Here, an efficient strategy substituting Ba 2+ with rare earth La 3+ in W-type ferrite was proposed for the preparation of novel La-substituted ferrites (Ba 1− x La x Ni 2 Fe 15.4 O 27 ). The influences of La 3+ substitution on ferrites’ EMW-absorption performance and the dissipative mechanism toward EMW were systematically explored and discussed. La 3+ efficiently induced lattice defects, enhanced defect-induced polarization, and slightly reduced the ferrites’ bandgap, enhancing the dielectric properties of the ferrites. La 3+ also enhanced the ferromagnetic resonance loss and strengthened magnetic properties. These effects considerably improved the EMW-absorption performance of Ba 1− x La x Ni 2 Fe 15.4 O 27 compared with pure W-type ferrites. When x = 0.2, the best EMW-absorption performance was achieved with a minimum reflection loss of −55.6 dB and effective absorption bandwidth (EAB) of 3.44 GHz.
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FUEL
·
2024
·
IF 6.7
Qiuxiang Yao,Lei He,Duo Ma,Yong Zhang,Dan Zhang,Ming Sun
The naphthalene derivatives in coal tar naphthalene and anthracene oil fractions mostly contain short-chain alkyl groups. The enrichment of PAHs (polycyclic aromatic hydrocarbons, mainly including naphthalene, anthracene, and pyrene) by the dealkylation of PAHs-rich fraction in coal tar was assumed to obtain high-purity PAHs by distillation. Based on this strategy, using 2-methylnaphthalene as the model compound, and the influences of catalysts with different supports (SiO 2 , Al 2 O 3 , ZSM-5, Beta, and HY) and different active metal components (Ni, Co, Mo, and W) prepared by the equivalent-volume impregnation method on the hydro-dealkylation performance of 2-methylnaphthalene under different technological conditions (temperature, H 2 initial pressure and reaction time) were systematically investigated in a pressurized batch reactor. The experimental results show that the conversion rate of 2-methylnaphthalene is 81.23 % and the selectivity of naphthalene is 64.22 % under conditions of 480 °C, 2 MPa, 4 h, and 6 W-HY. Loading 0.8 wt% La on the 6 W-HY catalyst can improve the dispersion of active metal component W on the support, but it does not change the skeleton structure of the support. In addition, one-dimensional diffusion is the most probable reaction mechanism for 2-methylnaphthalene, and the evolution profiles of naphthalene can be reflected by the reaction mechanism with a reaction order of n = 4 using the model fitting method.
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