CHEMOSPHERE
·
2021
·
IF 7.086
LingYan Liu,ChunHong Zhang,ShuangRong Chen,Lan Ma,YingMei Li,YiFeng Lu
La(OH) 3 -modified canna biochar (CBC-La) was prepared by a coprecipitation method (dipping method), and its phosphate adsorption characteristics were investigated. The results show that the pseudo-second-order kinetics and the Langmuir model can be used to describe the adsorption process with a high level of accuracy. Adsorption equilibrium could be reached at 8 h, at which point the maximum adsorption capacity was shown to be 37.37 mg/g. CBC-La has excellent phosphate adsorption capacity in the middle to low concentrations (≤50 mg/L), and its removal rate can exceed 99 %. CBC-La also has wide pH adaptability (3–9) and a strongly selective adsorption performance. Notably, it can still maintain a removal rate of over 99.8 % in the presence of certain anions (NO 3 − , HCO 3 − , and CO 3 2− ), and the presence of NH 4 + has a synergistic effect on the adsorption process. Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) measurements demonstrate that the main mechanisms of CBC-La phosphate adsorption are electrostatic adsorption, ion exchange, ligand exchange and inner sphere complexation.
研究领域:
环境科学
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材料科学
·
水处理
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吸附技术
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生物炭改性
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DOI
高影响因子
Small Structures
·
2023
·Vol. 4
·期 11
·2300175
·
IF 15.9
Wenxian Li,Zulin Sun,Riyue Ge,Jiancheng Li,Yiran Li,Julie M. Cairney,Rongkun Zheng,Ying Li,Sean Li,Qian Li,Bin Liu
MoS 2 with 2D structure shows efficient hydrogen evolution reaction (HER) performance because undercoordinated Mo–S edges have ideal hydrogen adsorption free energy. MoS 2 usually does not satisfy the bifunctional catalysts because of the poor intrinsic oxygen evolution reaction (OER) catalytic activity. Herein, it is proposed to construct heterostructure with OER active components to induce efficient bifunctional catalytic activity along with heteroatom doping to modify the electronic structure to optimize the adsorption and desorption capabilities of reaction intermediates. La-doped Ni 3 S 2 /MoS 2 grown on nickel foam (La-NMS@NF) is synthesized as bifunctional catalyst taking advantage of the excellent OER performance of Ni 3 S 2 . La-NMS@NF evolves into nanoflower-like structures with the addition of La dopant, which provides abundant pore channels to facilitate mass transfer and exposure of active sites. Density functional calculations reveal that the La-doped Ni 3 S 2 /MoS 2 heterointerface can optimize the water adsorption and H * adsorption/desorption, improving the HER performance. The La-NMS@NF exhibits an overpotential of 154 and 300 mV for HER and OER at 100 mA cm −2 in 1.0 m KOH. Herein, a heteroatom-driven heterostructure activation strategy for electron rearrangement and structural evolution in electrocatalysts to decrease energy consumption in overall water splitting is demonstrated.
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DOI
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 47
·30522-30528
·
IF 4.036
Weisen Yang,Fengshuo Shi,Wenlong Jiang,Yuhuang Chen,Kaiyin Zhang,Shaoju Jian,Shaohua Jiang,Chunmei Zhang,Jiapeng Hu
A La-based adsorbent was prepared with La(NO3)3·6H2O, 2-methylimidazole and DMF via amide-hydrolysis and used for fluoride decontamination from aqueous water. The obtained adsorbent was lanthanum methanoate (La(COOH)3). The effects of pH value, initial F− concentration and interfering ions on defluoridation properties of as-prepared La(COOH)3 were assessed through batch adsorption tests. The adsorption kinetics, isotherm models and thermodynamics were employed to verify the order, nature and feasibility of La(COOH)3 towards fluoride removal. The results imply that La(COOH)3 is preferable for defluoridation over a wide pH range of 2 to 9 without interference. Simultaneously, the defluoridation process of La(HCOO)3 accords to the pseudo-second order model and Langmuir isotherm, revealing chemical adsorption is the main control step. The maximum fluoride capture capacities of La(COOH)3 at 30, 40 and 50 °C are 245.02, 260.40 and 268.99 mg g−1, respectively. The mechanism for defluoridation by La(COOH)3 was revealed by PXRD and XPS. To summarize, the as-synthesized La based adsorbent could serve as a promising adsorbent for defluoridation from complex fluoride-rich water.
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DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Mengjuan Cao,Mengkai Yang,Yanyan Xu,Yaqiu Sun,Hongming Sun
It is of great value to explore non-noble and highly active electrocatalysts for oxygen evolution reaction (OER) to obtain reproducible and clean fuels. In this work, a novel La-doped FeNiSe 4 /Fe 0.8 Ni 0.2 Se 2 /NF (La-FeNi-Se/NF) heterostructure catalyst was prepared by a facile selenization treatment to La-doped FeNi Prussian blue analogue(PBA) in-situ grown on foam nickel (NF). The catalytic performance of La-FeNi-Se/NF was significantly enhanced by the doped La 3+ . As a result, the optimized La-FeNi-Se-2/NF exhibits superior alkaline OER electrocatalytic activity (overpotential 158 mV at 10 mA cm −2 and Tafel slope 35.6 mV dec −1 ) than FeNi-Se/NF and Ln-FeNi-Se/NF (Ln = Ce, Gd, Yb), and most reported FeNi-based OER electrocatalysts. The excellent electrocatalytic capability to OER is attributed to the doping FeNi-Se heterostructure with a suitable amount La 3+ . Also, the unique La-FeNi-Se-2/NF flower-like structure composed of nanograins can produce abundant active sites and enhance charge transfer, thereby further improving the catalytic performance. This work highlights an effective chemical and engineering method to prepare efficient electrochemical catalysts.
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 46
·期 2
·490-497
·
IF 3.591
Shaoju Jian,Yiting Cheng,Xiaofan Ma,Hongtao Guo,Jiapeng Hu,Kaiyin Zhang,Shaohua Jiang,Weisen Yang,Gaigai Duan
La–Mn bimetal oxide nanofibers, used as an adsorbent for the defluoridation of water, were synthesized by an electrospinning and heat treatment technology. The La–Mn bimetal oxide nanofiber adsorbent with a specific surface area of 35.064 m2 g−1 displayed a good defluoridation performance. Both the adsorption kinetics and equilibrium for fluoride (F−) uptake onto La–Mn bimetal oxide nanofibers were investigated. The kinetic studies established that the adsorption attained equilibrium at about 90 min, and the PSO kinetic model was ideal for the kinetic data under 20 and 50 mg L−1. The Langmuir maximum F− uptake was computed to be 189.39 mg g−1 at 308 K and pH 3. A thermodynamic study affirmed a feasible, endothermic, spontaneous and entropy driven process of F− adsorption towards La–Mn bimetal oxide nanofibers at the studied temperature range. Except for the competitive adsorption of PO43− and F−, the presence of NO3−, CO32−, Cl− and SO42− had little effect on fluoride removal. The La–Mn bimetal oxide adsorbent exhibited a good reusability.
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2013
·
IF 3.535
Hao Shan,Changbai Liu,Li Liu,Shouchun Li,Lianyuan Wang,Xiaobo Zhang,Xiaoqing Bo,Xiao Chi
Pure and La-doped (5 wt%, 7 wt% and 10 wt%) α-Fe 2 O 3 nanotubes are synthesized by an electrospinning method and followed by calcination . The as-synthesized nanotubes are characterized by scanning electron microscope (SEM) and X-ray powder diffraction (XRD). Compared with pure α-Fe 2 O 3 nanotubes, La-doped α-Fe 2 O 3 nanotubes exhibit improved acetone sensing properties at 240 °C. The response of 7 wt% La-doped α-Fe 2 O 3 nanotubes to 50 ppm acetone is about 26, which is 10 times larger than that of pure α-Fe 2 O 3 nanotubes. The response and recovery times of 7 wt% La-doped α-Fe 2 O 3 nanotubes to 50 ppm acetone are about 3 and 10 s, respectively. Moreover, 7 wt% La-doped α-Fe 2 O 3 nanotubes show a good selectivity to acetone.
研究领域:
材料科学
·
传感技术
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产品关联
DOI
高影响因子
ACTA MATERIALIA
·
2025
·
IF 9.3
Liang Yan,Yujing Zhang,Yilin Zhang,Pan Ying,Chuyang Liu,Jie Jiang,Xiaopeng Li,Dong-Hyun Kim,Zhi Zhang,Feng Xu,Zhihui Zeng
The polarization effect has been unequivocally demonstrated to markedly enhance the microwave absorption performance. However, the pursuit of achieving broadband absorption through meticulously designed polarization behavior continues to pose a formidable challenge. In this work, we present a unique multi-polarization strategy in the La(OH) 3 /N-doped rGO composites, incorporating dipole polarization induced by nitrogen doping and intrinsic defects, homogeneous interfacial polarization contributed by locally crystalized nano-domains in La(OH) 3 , and heterogeneous interfacial polarization at the heterojunctions between La(OH) 3 and N-doped rGO, to significantly enhance the multi-band polarization loss. Experimental and theoretical investigations reveal that the La(OH) 3 /N-doped rGO hybrid featuring distinctive crystalline/amorphous nano-domains exhibits remarkable coupling effects, encompassing an enhanced electron transport rate and strengthened interfacial electron interactions. The improved electron transport is attributed to increased electron transitions at heterojunctions with matched Fermi levels and enhanced charge conduction from the crystalline regions within La(OH) 3 . Furthermore, strong polarization relaxation at these heterojunction interfaces, along with weaker but significant polarization at numerous homogeneous interfaces, contributes to the enhanced interactions. Consequently, an exceptional minimal reflection loss of -69.6 dB has been achieved, accompanied by an impressive effective absorption bandwidth of 7.7 GHz, which surpasses that of the current state-of-the-art microwave absorbers. This work unveils an innovative design paradigm aimed at the meticulous regulation of polarization loss, thereby laying a robust foundation for the advancement of high-performance absorbers.
研究领域:
材料科学
·
电磁学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Xiangyun Sun,Changping Ke,Qifa Lu,Long Liang,Guangyuan Xie
This study developed a novel fluoride ion adsorbent material (Al/La-A) for efficient removal of fluoride ions in water. The crystal structure, elemental composition, surface morphology, specific surface area, thermal stability and surface electronegativity before and after modification were explored using FTIR, XRD, XPS, SEM-EDS, BET, TG-DSC, and zeta potential measurements. Results showed that the fluoride ion adsorption capacity of Al/La-A reached 130.42 mg/g, with the surface area increasing from 65.66 m 2 /g to 111.68 m 2 /g, respectively, compared to unmodified attapulgite. Al/La-A maintained excellent fluoride ion removal performance over a wide pH range, with the best adsorption at pH 2. Coexisting ion experiments indicated weak competitive adsorption effects of Cl - , SO 4 2- , and HCO 3 – , with fluoride ion adsorption remaining above 100 mg/g in the presence of different concentrations of coexisting anions. After 5 adsorption–desorption cycles, Al/La-A exhibited strong adsorption capacity and reusability. The fitting of Langmuir adsorption model and pseudo-second-order kinetic model to the adsorption of fluoride ions on Al/La-A indicated that the adsorption of fluoride ions on Al/La-A was primarily monolayer chemical adsorption. The adsorption mechanism of fluoride ions involved electrostatic interactions, ion exchange, and coordination complexation. This study provides a new research approach for the optimal utilization of attapulgite-based adsorbent materials and the efficient removal of fluoride-containing wastewater.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2024
·
IF 3.7
Jiangyan Song,Yongyi Yu,Ziyi Zhang,Weisen Yang,Wenbin Pan,Shaoju Jian,Shaohua Jiang,Jiapeng Hu
Deposition of excessive phosphate in natural water column caused several issues, like the eutrophication and destruction of aquatic ecosystems. Adsorption has been an effective and convenient method for phosphate elimination. Herein, a novel bimetallic metal–organic framework adsorbent, namely, La-Zr-MOF, was prepared, and the morphology, crystallite, characteristic functional groups, specific surface area, and composite material surfaces were analyzed using XRD, FT-IR, SEM-EDS, and BET. The adsorption performance of the adsorbent was systematically evaluated by batch adsorption experiments, and the adsorption thermodynamic and kinetic properties were analyzed. The results reveal that La-Zr-MOF exhibits a high selectivity and sorption performance for phosphate, and the adsorption of La-Zr-MOF follows the Langmuir and pseudo–second-order models; the phosphate removal procedure is a chemisorption accompanied by an endothermic reaction, and the maximum capacity was 127.7 mg g −1 . Combined with batch adsorption experiments, kinetic and thermodynamic studies and various characterization analyses together revealed the phosphate removal mechanism, mainly ligand exchange and electrostatic interactions.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 35
·12037-12047
·
IF 6.4
Ruifeng Wu,Haibing Li,Yafei Liu,Aimin Chang,Bo Zhang
It is found that the linearization of the resistance–temperature curve for CaCu3Ti4O12 can be achieved by changing the energy band structure induced by Fe3+, but at the cost of decreasing temperature sensitivity. Here, a novel strategy is proposed to improve the thermal and dielectric properties of CaCu3Ti4O12 ceramics by (La,Fe)-co-doping. This can both linearize the resistance–temperature relationship by adjusting the energy band structure of the grains due to the Fe3+ doping and improve the temperature sensitivity by increasing the grain boundary potential barrier resulting from La3+ doping. The dielectric constant increases upon decreasing the grain boundary potential barrier and increasing the carrier concentration. Therefore, the dielectric constant and temperature sensitivity can be regulated by adjusting the characteristics of grains and grain boundary. This work bridges the relationship between thermal sensitivity and dielectric properties, and opens up a door for the development of a multifunctional coupler CaCu3Ti4O12 device.
研究领域:
材料科学
·
电子工程
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DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2022
·
IF 6.364
Xiaowen Hu,Jinwu Chen,Jie Li,Huaicheng Xiang,Ying Tang,Liang Fang
Two zircon-structured ceramics AEuV 2 O 8 (A = Bi, La) were prepared with optimal sintering temperatures of 900 °C and 1375 °C, respectively. They exhibited sharp contrast performances with medium ε r ∼ 28.7 ± 0.1, Q × f ∼ 14,000 ± 300 GHz, and large positive τ f ∼ 75.7 ± 2.0 ppm/°C for BiEuV 2 O 8 , whereas low ε r ∼ 10.4 ± 0.1 Q × f ∼ 25,100 ± 300 GHz, and negative τ f ∼ − 40.7 ± 2.0 ppm/°C for LaEuV 2 O 8 . The rattling effect at the A-site was more dominant in determining microwave dielectric properties than that of compressed V 5+ at the B-site. It resulted in the higher ε r , lower Q × f and τ ε , and larger τ f of BiEuV 2 O 8 than those of LaEuV 2 O 8 . Besides, their Q × f was related with the relative density, bond valence and FWHM of the B 1 g Raman mode.
研究领域:
材料科学
·
物理学
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DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2026
·Vol. 118
·期 3
·55
·
IF 4.2
Zhang Siyu,He Ruitao,Cai Chaomin,Sun Yuxia,Li Ruiming,Yang Man,Liu Hongri
Antimony sulfide (Sb₂S₃) is a highly promising environmentally friendly semiconductor for the development of stable thin-film solar cells, owing to its high absorption coefficient, suitable bandgap ( ~ 1.7 eV), and the abundance of its constituent elements. Conventionally, CdS is employed as a buffer layer in CdS/Sb₂S₃/spiro/Au-structured solar cells. However, due to its intrinsic defects, various strategies have been implemented to enhance device performance and improve the power conversion efficiency (PCE) of Sb₂S₃ solar cells. In this study, we first fabricated a SnO₂ electron transport layer (ETL) and subsequently optimized the water bath temperature to achieve a smoother CdS layer. Furthermore, a La³⁺ ion doping process was introduced to further decrease the resistance of the CdS layer. The incorporation of an appropriate concentration of La³⁺ into the CdS layer effectively redeced its resistivity. By integrating these enhancements, we developed a La-doped CdS/SnO₂ double ETL structure. The grain size of Sb₂S₃ deposited on the 1% La-doped CdS/SnO₂ double ETL was significantly increased, leading to a substantial reduction in grain boundary density. This improvement minimized non-radiative recombination at both the grain boundaries and the CdS/Sb₂S₃ heterointerface while simultaneously enhancing charge-carrier transport across the heterojunction. Consequently, the optimized solar cell achieved an open-circuit voltage (V OC ) of 749 mV and a short-circuit current density (J s c ) of 17.01 mA/cm 2 , resulting in a power conversion efficiency (PCE) of 7.66%. This work presents an effective doping strategy to enhance the performance of the CdS buffer layer, offering valuable insights for the advancement of Sb₂S₃-based thin-film solar cells. Graphical The alternative text for this image may have been generated using AI.
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高影响因子
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