Coatings
·
2023
·Vol. 13
·期 2
·317
·
IF 3.4
Yan Zhang,Tianyi Sun,Dashuai Zhang,Chen Li,Jinrui Liu,Bangsen Li,Zaifeng Shi
The fact that the use of a large number of plastic products has brought serious pollution to the environment has always been the focus of global attention. The development of photocatalytic degradable plastics is one of the effective ways to solve the problem of “white pollution”. In this work, La3+modified TiO2nanoparticles were prepared by ball milling and characterized. La3+/TiO2was mixed with Polyvinyl chloride (PVC) plastic to make a photodegradable composite film, and the photodegradation performance and mechanical properties of films were evaluated. The photodegradable films were characterized by infrared spectroscopy (FT-IR), X-ray diffractometry (XRD), and scanning electron microscopy (SEM). After 30 h UV irradiation, the weight loss rate of the PVC was only 2.12%, while that of the TiO2/PVC reached 8.94%. The accelerating of the degradation rate was due to the mixing of TiO2into PVC. As for the La3+/TiO2/PVC composite film, when the mass percentage of La3+/TiO2was 1.5%, the weight loss rate of La3+/TiO2/PVC sample reached a maximum of 17.78%, which was eight times the degradation rate of PVC and two times the degradation rate of TiO2/PVC. The La3+/TiO2/PVC film showed good photodegradability. La is a transition metal element with a special 4f electronic structure. The reaction mechanism of photodegradation of PVC by the interaction of La3+and TiO2were discussed.Keywords:La3+modified TiO2;La3+/TiO2/PVC composite film;ball milling method;photodegradation
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Lindun Zou,Chun Tian,Zhaoyang Lin,Yuquan Wang,Tianyi Gu,Zuchun Wang,Tao Tang,Hongqi Shi
The rampant misuse of organic dyes has exacerbated environmental pollution to an alarming degree. SrBi 4 Ti 4 O 15 , a layered perovskite semiconductor material, demonstrates considerable potential in the degradation of organic dyes, and efforts have been made to enhance its photocatalytic efficiency. In this study, La 3+ doping was utilized to synthesize SrBi 4-x La x Ti 4 O 15 (x=0, 0.10, 0.15, 0.25, 0.40) nanosheet photocatalysts, and their photocatalytic performance and underlying mechanisms were comprehensively investigated. XRD and Raman spectroscopy revealed that La 3+ doping replaced Bi 3+ at the A-site, resulting in a reduction of the interlayer spacing of [TiO 6 ] octahedra. Combined with DFT calculations, La 3+ doping was found to widen the band gap of SrBi 4 Ti 4 O 15 and raise the Fermi level. Additionally, La 3+ doping significantly increased the ratio of the Ti 3d component at the bottom of the conduction band, favoring the migration of photogenerated electrons along the [TiO 6 ] octahedra and accelerating the separation of photogenerated carriers. SEM and BET analyses revealed that La 3+ doping not only increased the size of the nanosheets but also significantly enhanced their specific surface area, thereby exposing more active sites. Degradation experiments of Rhodamine B (Rh B) under UV light demonstrated that the photocatalytic efficiency of SrBi 3.75 La 0.25 Ti 4 O 15 (k = 0.0514 min -1 ) was 2.66 times higher than that of the original SrBi 4 Ti 4 O 15 (k = 0.0193 min -1 ). The theoretical degradation pathway of Rh B was elucidated using LC-MS analysis and the developmental toxicity of potential intermediates was analyzed. Moreover, the SrBi 3.75 La 0.25 Ti 4 O 15 photocatalyst also exhibited excellent degradation efficacy against Methylene Blue (MB), Crystal Violet (CV), and Methyl Orange (MO). This study provides both theoretical and experimental insights into improving the photocatalytic performance of SrBi 4 Ti 4 O 15 , thereby enhancing its potential for industrial application.
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
MATERIALS RESEARCH BULLETIN
·
2019
·
IF 3.355
Jing Lei,Bitao Liu,Qiuhong Min,Lei Zhao,Dacheng Zhou,Jianbei Qiu,Xuhui Xu,Xue Yu
Lanthanide doped upconversion nanocrystals are widely applied in biological imaging, photonics, photovoltaics and therapeutics. Highly monodispersed and uniform products with controllable optical modulation of upconversion fluorescence really matters their promising applications. Here, Er 3+ doped Ba 2 YbF 7 nanocrystals with phase transformation, controllable morphology and tunable upconversion emission color is investigated via varying the concentration of La 3+ . Accompanied with tetragonal Ba 2 YbF 7 transformed to be cubic phase, nanocubes appear instead of nanorods, and a distinct upconversion color changing from yellow to green is obtained. Crystal structure management of Ba 2 YbF 7 contributing to a suppressive back energy transfer process, which facilitates a controllable upconversion color in monodispersed nanocrystals with a uniform morphology, is demonstrated.
研究领域:
材料科学
·
光学
·
生物成像
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2020
·
IF 3.408
Tengyan Wu,Guokang Shen,Feng Ding,Duxin Li,Hongbin Zhong
In this study, the La doped Mn–Zn nanoferrites were synthesized through hydrothermal method , and then were used to activate persulfate for degrading azo dye the Direct Blue 15 (DB15). The structure and morphology of the as-prepared sample were characterized by X-ray Diffraction (XRD), Fourier Transformed Infrared Spectrometer (FTIR), Transmission Electron Microscopy (TEM) and Energy Dispersive Spectrometer (EDS). The results indicated that the La doped Mn–Zn ferrite was successfully synthesized in this study. Four absorption bands were observed in FTIR spectra and assigned to the corresponding site bonds. Mn 0.6 Zn 0.4 La x Fe 2- x O 4 was chosen as catalysts to activate persulfate (PS/Mn 0.6 Zn 0.4 La x Fe 2- x O 4 ) to decolorize the DB15. It was found that the DB15 was degraded effectively by PS/Mn 0.6 Zn 0.4 La x Fe 2- x O 4 systems. Furthermore, the influences of synthesized conditions (such as the temperature, holding time and doping content of La) of Mn 0.6 Zn 0.4 La x Fe 2- x O 4 on the DB15 decolorization were analyzed. The results indicated that the doping of La can significantly improve the DB15 degradation, 100% degradation of DB15 can be obtained by PS/Mn 0.6 Zn 0.4 La 0.09 Fe 1.91 O 4 within 15 min. The enhancement of synthesized holding time of Mn 0.6 Zn 0.4 La x Fe 2- x O 4 at 160 °C can also increase the DB15 decolorization, and the degradation rate of the DB15 reached almost 100% within 25 min when using Mn 0.6 Zn 0.4 La 0.05 Fe 1.95 O 4 synthesized at 160 °C for 13 h as catalyst.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2023
·Vol. 19
·期 21
·2300862
·
IF 13.3
Hong Zhu,Yuexiao Pan,Chengdong Peng,Yihong Ding,Hongzhou Lian,Jun Lin,Liyi Li
Single-component white light emitters based on the all-inorganic perovskites will act as outstanding candidates for applications in solid-state lighting thanks to their abundant energy states for self-trapped excitons (STE) with ultra-high photoluminescence (PL) efficiency. Here, a complementary white light is realized by dual STEs emissions with blue and yellow colors in a single-component perovskite Cs 2 SnCl 6 :La 3+ microcrystal (MC). The dual emission bands centered at 450 and 560 nm are attributed to the intrinsic STE1 emission in host lattice Cs 2 SnCl 6 and the STE2 emission induced by the heterovalent La 3+ doping, respectively. The hue of the white light can be tunable through energy transfer between the two STEs, the variation of excitation wavelength, and the Sn 4+ /Cs + ratios in starting materials. The effects of the doping heterovalent La 3+ ions on the electronic structure and photophysical properties of the Cs 2 SnCl 6 crystals and the created impurity point defect states are investigated by the chemical potentials calculated using density functional theory (DFT) and confirmed by the experimental results. These results provide a facile approach to gaining novel single-component white light emitter and offer fundamental insights into the defect chemistry in the heterovalent ions doped perovskite luminescent crystals.
研究领域:
材料科学
·
光学
·
物理化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Particuology
·
2025
·
IF 4.3
Yiying Wang,Dandan Shi,Yue Cao,Xing Han,Tianying Zhang,Kaipeng Zhong,Qi Zhao,Naicai Xu,Shaoju Bian
Driven by the increasing global demand for lithium, significant attention has been directed toward developing efficient technologies for lithium extraction from Salt Lake brines. Li 1.6 Mn 1.6 O 4 spinel shows high lithium selectivity and notable theoretical uptake capacity, indicating strong application potential in lithium extraction. However, the industrial application of this material is limited by its strong Jahn-Teller effect and manganese dissolution loss. In this study, LiOH and MnCO 3 were selected as the raw materials and La 2 O 3 was used as the doping modifier. The La 3+ -doped Li 1.6 Mn 1.6 O 4 precursor (La-LMO) was fabricated through hydrothermal and high-temperature solid-phase synthesis techniques. Then La 3+ doped H 1.6 Mn 1.6 O 4 lithium ion-sieve (La-HMO) was prepared by pickling. The materials' structure and morphology were examined using XRD, SEM, TEM, and XPS techniques. La 3+ doping does not alter the spinel structure of LMO but reduces Mn 3+ content, mitigates the Jahn-Teller effect, lowers the manganese dissolution rate, and enhances structural stability. Adsorption of Li + onto La-HMO follows pseudo-second-order kinetics and fits the Langmuir model, suggesting homogeneous monolayer adsorption driven by chemisorption. In the lithium extraction experiment from the brine of West Tai Kinel Salt Lake, La-HMO demonstrated high adsorption capacity and superior selectivity for Li + . After five cycles, La-HMO maintained an adsorption capacity of 33.10 mg/g, higher than the 26.80 mg/g for undoped HMO. The manganese dissolution rate dropped from 4.65% to 4.04%. The study significantly improved the adsorption properties and structural stability of HMO by doping La 3+ , which has broad application prospects in the separation and extraction of lithium resources in Salt Lake.
研究领域:
材料科学
·
化学工程
·
无机化学
·
环境科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·Vol. 46
·期 18
·28173-28182
·
IF 3.83
Linjiang Yu,Jia Dong,Mingyang Tang,Yi Liu,Fei Wu,Yan Yan,Gang Liu,Chunlin Song
A conventional preparation method of electroceramics was used to synthesise Pb-free 0.85Na 0.5 Bi 0.5 TiO 3 -0.15CaTiO 3 - x La (NBT-CT- x La) ceramics. La 3+ doping effectively refined the grains and enhanced the dielectric breakdown strength (BDS) of the ceramics; this result was confirmed by numerical simulations, which revealed that grain refinement significantly contributed to the enhancement of the BDS. The energy storage density consequently improved when an appropriate amount of La 3+ was added to the NBT-CT ceramics. In particular, the NBT-CT-0.75La ceramic displayed a maximum energy storage density of 2.15 J/cm 3 and a high BDS of 210 kV/cm. This ceramic also possessed relatively excellent temperature and frequency stabilities (30–150 °C, 0.2–200 Hz). Moreover, the ceramics exhibited exceptional charge–discharge performances, with an outstanding power density of 43.87 MW/cm 3 , which is nearly twice of that of other NBT-based ceramics. On the basis of the findings, the NBT-CT-0.75La ceramic can be considered to be a promising candidate material for the pulsed power application.
研究领域:
材料科学
·
功能陶瓷
·
电介质物理
·
能源存储
·
无机非金属材料
✓ 已验证
DOI
高影响因子
IONICS
·
2023
·Vol. 29
·期 7
·2549-2561
·
IF 2.8
Peng Jiaqi,Wei Yuanyuan,Hu Bin,Zhang Liang,Huang Jinfu,Tang Hongyu,Huang Bin,Li Yanwei,Chen Shaojun,Xiao Shunhua
Due to the urgency of developing high energy density cathode materials in power batteries, as well as the high price and environmental unfriendliness of cobalt, researchers are working on ultra-high nickel low cobalt and ultra-high nickel cobalt-free layered cathode materials. However, the poor cyclic stability and rate performance of this material resulted from structural instability and severe surface/interface side reactions during cycling seriously hinder its practical application. In this paper, LiNi 0.9 Mn 0.1 O 2 (NM90) cathode material is modified by La 2 O 3 coating, and La 3+ doping caused by thermal diffusion is achieved simultaneously. The synergistic enhancement of the two modifications can effectively improve the layered structure and reduce surface/interface side reactions. The dual-modified material shows good structural stability, the La 2 O 3 coating does not fall off and the active material does not appear fragmentation and collapse after 100 cycles. At the same time, the dual-modified material also shows excellent electrochemical performance, with a capacity retention of 83.19% after 100 cycles at 1 C and a reversible capacity of 129.9 mAh g −1 at 10 C. The electrochemical mechanism reveals that the dual-modified material effectively reduces the charge transfer resistance and greatly increases the Li + diffusion coefficient. It will provide useful reference and technical support for the research of other electrode materials. Graphical abstract The NM90 and La 2 O 3 -coated NM90 particles have similar spherical morphology and are formed by the agglomeration of many primary particles; the surface of NM90 material is evenly coated by La 2 O 3 and No obvious boundary between La 2 O 3 and NM90 materials is found; LiNi 0.9 Mn 0.1 O 2 cathode material coated by 1wt% La 2 O 3 has the best cycle stability.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Ziqi Zhang,Tiejun Wang,Siqi Zhang,Kaida Yao,Yueqiu Sun,Yang Liu,Xiangzhi Wang,Weimin Huang
Ti-based MOFs have large superficial area, ordered pores array, biocompatible metallic ions and offer better biocompatibility in contrast with other reported MOFs carriers, which makes it possible to be applied in the biomedical field. In this work, we fabricated a novel La 3+ doped MIL spherical analogue nanoparticle and use it as an additives for composite coating on titanium implant, which exhibited desirable antibacterial property and corrosion resistance without damaging the biocompatibility. This newly synthesized MOF derivative material provides an option for the development of novel in vivo implant coatings.
研究领域:
生物医学工程
·
材料科学
·
医学
✓ 已验证
DOI
高影响因子
THIN SOLID FILMS
·
2023
·
IF 2.1
Xin Gu,Shuaizhao Jin,Zhiyuan Yu,Xiaokun Zhu,Kaikai Wu,Liming Zhao,Yixin Yan,Qingming Chen,Xiang Liu
Herein, refined La x Ca 0.89- x Sr 0.11 MnO 3 (LCSMO, x = 0.65, 0.68, 0.71 and 0.74) films were prepared through the sol-gel spin-coating. The influence of La 3+ content on the structural properties of LCSMO films was investigated by X-ray diffraction and Atomic force microscope, demonstrating that LCSMO films can grow well on SrTiO 3 (00 l ) substrate. Besides, X-ray photoemission spectroscopy verified the double exchange (DE) effect was weakened with La 3+ dopant. The La 3+ doping and interconnected grains boundaries (GBs) led to the weakening DE effect and GBs scattering, respectively. Due to superior GBs connectivity, the resistivity of LCSMO films was less than 7.1 × 10 −4 Ω·cm at low temperature of 100 K. Importantly, it is an effective control method to keep the temperature ( T k ) corresponding to temperature coefficient of resistivity ( TCR ) at room temperature with Sr 2+ content as constant in LCSMO films. At x = 0.71, the peak TCR value was found to be 8.84%/K and corresponding T k was 283.15 K. These results are beneficial for advanced application of uncooling infrared bolometer.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Fuming Lai,Renjing Duan,Xiaoshi Lang,Tan Wang,Tingting Qu,Lan Li,Qinzhi Lai,Kedi Cai
Lithium-sulfur batteries are considered a favourable contender for next-generation energy storage systems owing to their high energy density (2600 Wh·kg −1 ). However, the severe "shuttle effect" of polysulfides and the slow redox kinetics involving phase transitions have seriously limited the commercialization of lithium-sulfur batteries. On this basis, in this paper, a type of nanoflower structure rare-earth lanthanum ion (La 3+ ) doping Sn 3 O 4 with a large number of catalytic active interfaces is designed via a facile one-step hydrothermal method. When serves as a capture centre to immobilize polysulfides, it exhibits a strong chemical adsorption capacity. Moreover, due to the unique 4 f electron configuration of the rare-earth elements, nanoflower structure La 3+ doping Sn 3 O 4 (La@Sn 3 O 4 ) as sulfur-wrapped matrix has a strong catalytic activity, which can effectively accelerate the conversion process of polysulfides. At the same time, the catalytic mechanism of La@Sn 3 O 4 /S composite cathode material targeting the solid to liquid phase transformation of polysulfides is effectively revealed via in-situ Raman spectroscopy test and the initial discharge capacity can reach 1429.6 mAh·g −1 at a current density of 0.1 C, and the capacity retention rate is 76.5 % after 130 cycles.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2023
·
IF 5.4
Zhen Zhao,Lei Zhang,Hongming Zhang,Wuhong Xin,Xiaowen Wang,Chunmiao Liu,Yang Guo,Yinghua Zhuang,Wanli Jiao
Investigating high-performance and low-energy consumption H 2 S sensors has become a hot research topic. This study adopted a one-step co-precipitation method to synthesize La-doped ZIF-8 deprotonating zinc acetate, lanthanum nitrate, and 2-Methylimidazole in an aqueous. La 2 O 3 /ZnO were synthesized with different La 3+ doping concentrations (0, 0.5, 1, and 1.5 at%). We found that La 3+ doping at a concentration of 1 at% showed the highest response value of 140 for 5 ppm H 2 S, at a low operating temperature of 100 °C, which is 2.4 times higher than that of pure ZnO. Additionally, La 3+ doping led to a lower detection limit of 1.9 ppb. The enhanced performance can be attributed to the widening of the difference in electron concentration, the increase in vacant oxygen content, and the spillover effect of H 2 S sensing. These factors were analyzed in detail by means of porosity, P-N heterojunctions, and the increased in adsorbed oxygen content caused by La 3+ doping.
研究领域:
材料科学
·
传感器技术
✓ 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）