JOURNAL OF LUMINESCENCE
·
2021
·
IF 3.599
Yingjie Zhao,Zewen Su,Youqiang Huang,Yuan Liu,Shiqing Xu,Gongxun Bai
The dual-functional optical materials that can achieve accurate temperature sensing and effective photothermal conversion have aroused great concern in biomedical and industrial fields. However, the lack of optical functional materials limits the photothermal devices in practical applications. In this work, the pure monoclinic Ho 3+ /Yb 3+ codoped La 2 Ti 2 O 7 microcrystals have been successfully synthesized for optical thermometry and photothermal conversion. Different from the partial overlap of thermal coupling energy levels in Er 3+ , the wide separation of emission bands in Ho 3+ reduce the calculation error of ratio-metric thermometry. The maximum value of sensitivity reaches 1.41% K −1 . And the light-to-heat energy conversion of the sample has been explored by some photothermal experiments. It is confirmed that the sample can be heated to the specified temperature by adjusting the power of the heating light source. Meanwhile, the photothermal imaging can be achieved because of the high photothermal conversion of the material. Besides, the dual-functional prototype probe based on La 2 Ti 2 O 7 :Ho 3+ /Yb 3+ microcrystals has been made to investigate the temperature sensing and photothermal conversion performance. These results illustrated the sample has potential applications in optical thermometry and biological photothermal therapy.
研究领域:
材料科学
·
生物医学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Yixi Xu,Yufei Huang,Jia Zhao,Xuhui Han,Chunpeng Chai,Huiling Ma
Two-dimensional nanomaterial MXene Ti 3 C 2 T x with excellent electrical conductivity has received extensive attention in the electromagnetic wave (EMW) absorption field. However, the excessively high permittivity of Ti 3 C 2 T x is not conducive to impedance matching and the absorption of EMW. Considering the low permittivity and mesoporous structure of MOF , in this work, Co/La-MOF were in situ growth on the surfaces of Ti 3 C 2 T x by a facile co-solvothermal method. The obtained Co/La-MOF anchored on Ti 3 C 2 T x (Co/La-MOF/Ti 3 C 2 T x ) composite exhibits low density with excellent EMW absorption performance. Co/La-MOF/Ti 3 C 2 T x -2 (Co 2+ /La 3+ mass ratio of 16:3) shows the minimum reflection loss of − 44.15 dB at 4.00 GHz with the effective absorption bandwidth of 3.67 GHz in the frequency range of 14.03–17.70 GHz under 1.3 mm. In addition, the electromagnetic absorption mechanism of Co/La-MOF/Ti 3 C 2 T x was also investigated. It provides an effective strategy for the preparation of a novel absorber with high EMW absorbing performance.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2023
·
IF 3.9
Ruixin Song,Shifei Kang,Liangtao Yao,Lulu Zheng,Dechao Yu,Dawei Zhang
BiVO4 has been widely used in the field of photocatalysis due to its nontoxic and moderate band gap. However, single BiVO4 has the disadvantages of a high recombination rate of photogenerated carriers and weak response to visible light, inhibiting its photocatalytic applications. To explore viable solutions, a hybrid material composed of lanthanum-doped bismuth vanadate (La-BiVO4) and oxygen-doped porous graphite carbon nitride (O-doped g-C3N4), i.e., La-BiVO4/O-doped g-C3N4 powder, was prepared by a facile hydrothermal reaction and low-temperature calcination. Then, the powder was loaded on polyacrylonitrile nanofibers (NFs) through the electrospinning fiber technique. Various surface science characterizations, including transmission electron microscopy and nitrogen absorption and desorption analysis, confirmed the successful synthesis of a mesoporous heterojunction material. The La3+-doping as well as the porous morphologies and larger specific surface area of the O-doped g-C3N4 ultimately improve the photocatalytic abilities via a proposed Z-scheme heterojunction mechanism. The roles of La3+-doping and morphology modification in promoting the separation of the photogenerated carriers and broadening the optical absorption range were experimentally discussed. The RhB degradation experiment indicated that the La-BiVO4/O-doped g-C3N4 powder has excellent photocatalytic activity, which is about 2.85 and 2 times higher than that of the pure BiVO4 and O-doped g-C3N4, respectively. Meanwhile, the La-BiVO4/O-doped g-C3N4 NF shows good stability and recoverability after a 10-cycle testing. Such a hybrid photocatalyst with a proposed Z-scheme heterojunction mechanism and good plasticity might pave a feasible way to fabricate a new library of photocatalysts.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF RARE EARTHS
·
2023
·
IF 4.9
Dandan Zou,Runlian Lin,Yu Han,Juan Jia,Guoqiang Zhou,Haisong Zhang,Kun Ge
With lanthanum (La) in agriculture, medicine, and the chemical industry, La shows accumulation in the body, especially in the bone, because of its similar structure to calcium. Moreover, La has a direct role in bone formation regulating osteoblasts and osteoclasts. Nevertheless, bone formation is complex under the regulation of osteogenesis, osteoclastogenesis, and angiogenesis in the bone microenvironment. It is difficult to comprehensively understand the regulation of bone homeostasis from a single kind of cell. Herein, some bone microenvironment-related cells and mouse calvaria culture models were used to study the regulatory effect of La-based compound-lanthanum nitrate (La(NO 3 ) 3 ) on bone formation. La(NO 3 ) 3 has good biological safety, and the osteogenic differentiation is significantly increased under La(NO 3 ) 3 treatment for bone marrow mesenchymal stem cells (BMMSC). In contrast, the differentiation, maturation, and bone erosion ability of osteoclasts are significantly decreased. Meanwhile, the angiogenesis ability of human umbilical vein endothelial cells (HUVEC) is significantly promoted when treated with La(NO 3 ) 3 . Furthermore, bone metabolism and angiogenesis are improved under La(NO 3 ) 3 treatment in the calvaria ex vivo culture model and BMMSC-HUVEC co-culture system. These results suggest that La has the beneficial effect of promoting bone metabolism and improving bone formation in the bone microenvironment.
研究领域:
材料科学
·
生物医学工程
·
细胞生物学
·
骨生物学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2017
·
IF 4.601
Dongjing Liu,Weiguo Zhou,Jiang Wu
CuO-based and MnO x -based sorbents modified with Ce and La using sol-gel method, were employed for elemental mercury removal at 120–240 °C. The Hg 0 removal activity of Mn 2 O 3 /ZSM-5 can be significantly enhanced by doping 50 at.% Ce or 10 at.% La, the Hg 0 removal efficiency increased by 94% and 71%, respectively. The Hg 0 removal ability of CuO/ZSM-5 subtly improved by addition of 50 at.% Ce or 10 at.% La, the Hg 0 removal efficiency ascended only by 6% and 18%, respectively. The XPS results revealed that Hg 0 transformed to HgO, and CuO (or Mn 2 O 3 ) was reduced to Cu 2 O (or Mn 3 O 4 ), which is in agreement with Mars-Maessen mechanism.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Jiyuan Guo,Yihang Li,Bingbing Bao,Zishan Zhang,Rong Zhang,Hui Dan,Yi Ding
Developing new matrices capable of simultaneous immobilization of lanthanides and actinides are challenging. Herein, this paper reported the ZrSiO 4 -based borosilicate glass-ceramics with excellent immobilization capabilities of lanthanides and actinides. The phase evolution and microstructure transformation affected by the (Nd, Ce)-co-doping content were investigated systematically. The results indicated that the solubility limits of Nd and Ce in the obtained glass-ceramics decreased with increasing temperature, which were up to 18, 16 and 10 at% at 1400 °C, 1450 °C and 1500 °C, respectively. The formation rate of ZrSiO 4 increased with the increase of the (Nd, Ce)-co-doping content and temperature, which reached the highest value of 96.43 wt% with Nd and Ce content of 10 at% at 1500 °C. The densification of the obtained glass-ceramics also increased with the increase of the content of Nd and Ce. In addition, it was found that the immobilization mechanism of the resulting glass-ceramics was the synergistic immobilization effect of the ceramic crystal and glass network. This work indicated that the ZrSiO 4 -based borosilicate glass-ceramics might be promising matrices for immobilizing high-level radioactive wastes containing lanthanides and actinides.
研究领域:
材料科学
·
核废料管理
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2024
·
IF 8.2
Xiaodong Pei,Hailong Gao,Cenyao Shang,Junxia Huang,Mengting Ge,Huifang Xie,Yanfang Feng,Bingyu Wang
The rare earth metal element lanthanum (La) possesses carcinogenic, genotoxic, and accumulative properties, necessitating urgent development of an efficient and cost-effective method to remove La. However, current sorbents still encounter challenges such as poor selectivity, low sorption capacity, and high production costs. This study therefore proposes a promising solution: the creation of phytic acid–assisted sludge hydrochars (P-SHCs) to eliminate La from water and soil environments. This method harnesses phytic acid's exceptional binding ability and the economical hydrothermal carbonization process. P-SHCs exhibit robust sorption affinity, fast sorption kinetics, and excellent sorption selectivity for La when compared with pristine hydrochars (SHCs). This advantage arises from the remarkable binding ability of phosphate functional groups (polyphosphates) on P-SHCs, forming P-O-La complexes. Moreover, P-SHCs demonstrate sustained sorption efficiency across at least five cycles, with a slight decrease attributed to the loss of phosphorus species and mass during recycling. Furthermore, P-SHCs demonstrated superior economic feasibility, with a higher estimated cost-benefit ratio than that of other sorbents. Our study further validates the exceptional passivation capability of P-SHCs, showcasing relative stabilization efficiency ranging from 37.6 % to 79.6 % for La contamination. Additionally, acting as soil passivation agents, P-SHCs foster the enrichment of specific soil microorganisms such as Actinobacteria and Proteobacteria, capable of solubilizing phosphorus and resisting heavy metals. These findings present novel ideas and technical support for employing P-SHCs in combatting environmental pollution stemming from rare earth metals.
研究领域:
环境科学
·
材料科学
·
土壤学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CATALYSIS LETTERS
·
2020
·Vol. 151
·期 3
·698-712
·
IF 2.482
Yu Shanqing,Yan Jiasong,Lin Wei,Long Jun,Liu Shang-Bin
Abstract A better understanding of the roles of rare earth (RE) in heterogeneous catalysts is crucial for improving the properties of catalysts in petro-chemical industry. Fluid catalytic cracking (FCC) catalysts containing RE-incorporated Y zeolites with excellent stability and activity are continuously used to improve the conversion of heavy oil into transportation fuels. In this paper, the effect mechanism of Lanthanum (La) on stability and acidity of Y zeolites are elucidated in conjunction with their influences on catalytic performance. The improvement on stability of La-incorporated Y zeolites can be attributed to the La incorporation which bonds strongly with framework O2 and O3 atoms and strengthens the interaction between framework Al and its neighbouring O atoms. It is the enhanced stability restrains the release of framework Al and the formation of extra-framework Al, hence leads to a decrease of total L acid amount and an increase of total B acid amount, especially a clear increase in medium strength B acid amount (with 31 P NMR/TMPO chemical shifts at 62 and 58) and a significant decrease in strong B acid amount (with 31 P NMR/TMPO chemical shifts at 70 and 65) with the incorporation of La into Y zeolites. However, the total acid amount decreases significantly when La 2 O 3 content is high. The increase of B acid amount and improved stability of LaHY zeolites, boost the conversion ability and isomerization ability of heavy oil, while resulting in poor olefins selectivity and coke selectivity caused by the enhancement of hydrogen transfer reactions. Therefore, Y zeolite containing appropriate La 2 O 3 content should be considered to enhance heavy oil cracking ability while boosting light olefins production and optimizing coke selectivity. Graphic Abstract
研究领域:
石油化工
·
催化材料
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Hairus Abdullah,Yu-Rou Ko,Dong-Hau Kuo,Noto Susanto Gultom
La–Sn-codoped Zn(O,S) catalysts were synthesized with different amounts (0%, 2.5%, 5%, and 10%) of Sn and a constant amount (10%) of La to improve the photocatalytic hydrogenation reaction (PHR) of azobenzene to aniline. The as-prepared catalysts were carefully characterized and tested for a hydrogenation reaction. The incorporation of Sn significantly enhanced the PHR activities since the incorporated Sn in the Zn(O,S) lattices could increase the conductivity of the catalysts to improve the charge transfer during the catalytic reaction as indicated with EIS measurement. Further measurement with a photoresponse of La–Sn-codoped Zn(O,S) catalysts also exhibited relatively higher intensities as compared to those of La-doped Zn(O,S) and Sn-doped Zn(O,S) catalysts. On the basis of the measurement results of EIS and transient photo current, the La–Sn-codoped Zn(O,S) with the best properties was further utilized for PHR to convert azobenzene to aniline. GC–MS measurement confirmed that 15 ppm azobenzene could be totally converted to aniline in only 60 min which was achieved with a catalyst that was prepared with 5%-Sn and 10%-La doping. The relatively short reaction time indicated that the as-prepared catalyst had a strong reduction capability able to cleave the strong bonding of N═N in azobenzene. The reaction kinetic of the N═N bond cleavage was elucidated based on solvation, adsorption, pinning, and photocatalytic hydrogenation processes on the catalyst surfaces.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Fazle Subhan,Sobia Aslam,Zifeng Yan,Ayaz Ahmad,U.J. Etim,Muhammad Naeem,Liu Zhen,Muhammad Ikram,Muhammad Yaseen
Lanthanum based adsorbents are promising in adsorptive desulfurization due to high activity. The dispersion degree of La 2 O 3 impacts desulfurization performance directly, and the development of an efficient strategy for La 2 O 3 dispersion still remained challenge. Herein, for the first time confined spaces and silanols of as-synthesized SBA-15 were used for dispersion of La 2 O 3 over mesoporous silica. The La(NO 3 ) 3 precursor is directly introduced into the confined spaces between silica walls and template of as-synthesized SAB-15 by solid state dispersion (SSD) strategy. The SSD strategy assists the formation of small sized La 2 O 3 with excellent dispersion after La precursor decomposition by the combined action of confined spaces and silanols. We also demonstrated that up to 20 wt% La 2 O 3 can be highly dispersed over as-synthesized SBA-15 (LaAS-20). Our investigations show that well-dispersion of La 2 O 3 correspond to high desulfurization activity for fuels, and the amount of thiophene captured can reach 0.12 mmol of S/g over LaAS-20, which is better than that over LaCS-20 and other La-doped reported sorbents. Furthermore, LaAS-20 adsorbent showed good stability and regeneration ability, and has potential applications to be applied in adsorptive desulfurization technology.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Ping Tan,Yixi Zheng,Yongyou Hu
A novel adsorbent CSN-La of lanthanum immobilized on electrospun chitosan nanofiber(CSN) was fabricated and used as adsorbent for arsenate removal. The effects of pH, contact time, arsenate concentration as well as column adsorption were investigated. The results indicated that the arsenate adsorption by CSN-La was pH dependent. The experimental data of arsenic adsorption by CSN-La well fitted pseudo-second-order kinetic model and Langmuir model. The saturated adsorption capacity of CSN-La reached up to 83.6 mg/g, which was significantly higher than that of CSN . CSN-La exhibited preferable arsenate removal in the presence of coexisting anions (chloride, sulfate, nitrate, bicarbonate) at much greater levels. The attractive performance of CSN-La rooted from its special structural characteristics, the host material CSN favored the preconcentration of arsenate through electrostatic attraction, and the immobilized lanthanum exhibited preferable arsenate removal through specific interaction. Column adsorption run by using CSN-La could effectively treat approximately 2650 bed volumes (BV) of feeding solution before breakthrough occurred (from 210 μg/L in influent to < 10 μg/L in effluent). The exhausted CSN-La could be repeatedly used after being eluted by sodium hydroxide solution. The obtained results indicated that CSN-La has a great potential in efficient removal of arsenate-containing water.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2016
·
IF 2.567
Lu Jiang,Wei Zhang,Congguang Luo,Daojian Cheng,Jiqin Zhu
Zeolite imidazolate frameworks (ZIFs) have been applied to gas adsorption, but there remain no reports detailing the adsorption–desorption process for lanthanum metal ion (LMI). This work first testifies that ZIF-8 has a better adsorption property than ZIF-90 for remediation of LMI from water. Adsorption results demonstrate that ZIF-8 removes 100.0% of the metals ions, whose concentrations are below 20 mg L–1, and the saturated adsorption capacity is 385 mg g–1. Characterization by P-XRD, ICP, and FT-IR indicates that the main structure of ZIF-8 remained unchanged to a large extent during the adsorption process. Density functional theory (DFT) calculations illustrated that the adsorption process is spontaneous, and the adsorption site is in the center of two imidazole rings. La-ZIF-8 was subjected to two polar desorbents, acetonitrile and methyl alcohol, possessing a desorption ratio of 94.4% and 61.0%, respectively. Recycling the adsorption/desorption process using acetonitrile resulted in significant crystal structure collapse after three recycles reducing the adsorption capacity to 150 mg g–1. However, acetonitrile still maintains a desorption ratio of over 90.0%. Our work shows that ZIF-8 can be used as an efficient adsorbent in the removal of aquatic LMI, especially at trace concentration levels.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）