Journal of Environmental Chemical Engineering
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2024
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IF 7.4
Yin Hu,Wei Chen,Fen Zhang,Lingling Wang,Xuanye Chen,Fei Han,Weiguo Song
Photocatalytic degradation of aqueous organic pollutant while hydrogen evolution has become an attractive and potential approach to address environmental pollution and energy shortages. The design of highly efficient photocatalyst and the mechanism study are the keys for this issue. For this purpose, a series of rare earth La doped perovskite NaTaO 3 were prepared by an easy solid-phase synthesis method. La doping changed the morphology, structure and physicochemical properties of NaTaO 3 crystal. More importantly, it also found that controllable La dopants formed a concentration gradient between the surface and bulk of NaTaO 3 crystal, which would cause a gradient of energy band structure. Noteworthy, 0.5La/NaTaO 3 was identified as the intermediate state with the La doping from A sites to B sites and from bulk to surface in NaTaO 3 crystal. It possessed a large La concentration gradient, leading to the better photoelectrochemical properties and photocatalytic performance than any other xLa/NaTaO 3 catalyst. For the photocatalytic reaction over 0.5La/NaTaO 3 , HCHO was partially mineralized and gradually converted to HCOOH due to the large energy barriers of the intermediate reaction steps, while H 2 was produced stably in the five recycle runs. The active species of • O 2 − , •OH and h + were detected by the control experiments with trapping agents, and • O 2 − was confirmed to be the dominant one in the photocatalytic reaction. On this basis, the possible mechanism was proposed to understand the photocatalytic system in depth.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2020
·
IF 4.495
Ting Deng,Kuibao Zhang,Kui Liu,Jianjun Zeng,Daimeng Chen,Haiyan Guo
In this study, a series of transparent ceramics with chemical composition of La 1+x Yb 1+y Zr 2 O 7 (x, y = 0.1−0.5) were successfully prepared by vacuum sintering using combustion synthesized powders. The effects of excess contents on the phase composition, microstructure and in-line transmittance have been studied. The detailed results indicate that the in-line transmittance increases at first and then decreases as La content be elevated. It was also determined that the highest in-line transmittance of La 1+x Yb 1+y Zr 2 O 7 (x, y = 0.1−0.5) ceramics is 84.1 % at 1100 nm when the excess amount of co-doped La-Yb is 30 %. Compared with stoichiometric LaYbZr 2 O 7 ceramic, the nonstoichiometric La 1+x Yb 1+y Zr 2 O 7 (x, y = 0.1−0.5) ceramics exhibit much higher transparency. In addition, the high excess amount of La, Yb and co-doped La-Yb also shows effects on the phase composition and crystal structure.
研究领域:
材料科学
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陶瓷工程
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光学材料
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DOI
高影响因子
Journal of Environmental Chemical Engineering
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2025
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IF 7.2
Hui-Min Zhao,Wei-Peng Jia,Rui Dang,Xiang-Rong Ma,Yang Ma,Shuang-Yu Li,Xin Han,Nai-Cai Xu,Yu-Hong Kang,Yong Gao,Hua-Rui Hao,Rui Bai,Zhi-Fang Zhang,Cui-Ying Lu
s The development of a new type of photocatalyst for multiple deep degradation of phenol in wastewater together with the elucidation of the method for this process are highly significant in the treatment of sewage. In this report, three-dimensional heterostructured La(OH)CO 3 /NiAl-LDHs composite catalysts were prepared by loading ultrathin NiAl-LDHs onto La(OH)CO 3 substrates using a hydrothermal synthesis method and an in-situ growth technique. Photocatalytic experimental studies showed that La(OH)CO 3 /NiAl-LDHs could remove up to 97 % of (degrade) phenol from water, which was 5.86 and nearly two-fold greater than pure NiAl-LDHs and La(OH)CO 3 . Even after 5 cycles, La(OH)CO 3 /NiAl-LDHs still sustains an excellent photocatalytic stability (93.6 % phenol degradation). Fabrication of ultrathin NiAl-LDHs greatly enhanced the surface expanse of the composites from 1.442 m 2 /g to 140.16 m 2 /g, exposing more active sites. According to the in-situ XPS analysis under irradiation and the capture of active species on La(OH)CO 3 /NiAl-LDHs, the electrons would be transferred from La(OH)CO 3 to ultrathin NiAl-LDHs. The S-type heterointerfaces formed at the La(OH)CO 3 substrate with ultrathin NiAl-LDHs nanosheets effectively inhibited carrier complexation and improved the catalytic performance. Meanwhile, the formation of oxygen vacancies between La(OH)CO 3 and NiAl-LDHs further enhanced the photocatalytic activity. The photocatalytic degradation mechanism of phenol showed that the main radicals of this catalytic reaction were •O 2 - and •OH. The three-dimensional stratified staging engaged with La(OH)CO 3 and the ultrathin NiAl-LDHs mixed nanosheet faces offered a new path to advance superlative catalysts to treat sewage.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
RADIOCHIMICA ACTA
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2019
·Vol. 108
·期 3
·195-206
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IF 1.339
Kun Tian,Shuting Zhuang,Jinling Wu,Jianlong Wang
A two-dimensional lanthanum(III) porous coordination polymer was prepared, characterized and applied as an efficient adsorbent for the removal of uranium from aqueous solution. Lanthanum(III) was the metal center of MOFs, and the deprotonated anions of pyridine-2,6-dicarboxylic acid (H 2 PDA), PDA 2− was the organic ligand, this MOF was name as La-PDA, which was synthesized by hydrothermal reaction method. Scanning electron microscope (SEM), Fourier transform infrared (FTIR), powder X-ray diffraction (PXRD) and thermal gravimetric (TG) analysis were used for characterization, and the results indicated that the La-PDA composites were successfully prepared. Compared with traditional adsorbents of uranium, La-PDA showed excellent adsorption properties. The adsorption capacity was 247.6 mg g −1 at 298 K and pH 4.0. The adsorption equilibrium achieved within 120 min, and the adsorption process was exothermic and spontaneous. The absorption mechanism of La-PDA was also explored, from the XPS spectra, the pyridine-like nitrogen atoms (C=N–C) and carboxyl oxygen atoms (–COO–) contributed to the adsorption of uranium. The results suggested that PDA 2− was a potential ligand of uranium adsorption, La-PDA composites were effective adsorbents for the removal of uranium from aqueous solution.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Journal of Physical Chemistry C
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2024
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IF 3.3
Jing Pan,Yongde Yan,Yuan Deng,Xuepeng Wang,Li Ding,Xin Kong,Yun Xue,Fuqiu Ma,Kai Zhu,Wei Liu
Electrolyte is considered to be one of the key factors affecting electrolysis in the rare earth and their alloys industry. Generally, the fluoride system is chosen as the electrolyte for industrial production. However, the molten salt electrolysis method for fluoride-oxide systems is not well understood and has not been systematically studied at this stage. In order to supplement this part, lanthanum (La) ions have been chosen as the research object in this paper to systematically investigate the preparation of La–Ni alloy from LaF3–LiF-CaF2–La2O3 molten salt. A series of electrochemical methods were used to investigate the mechanism and kinetic properties of La(III) reduction on W and Ni electrodes. The electrochemical reduction properties and kinetic parameters of La were obtained. La–Ni alloy was prepared by potentiostatic electrolysis, and it was verified by detailed analysis through characterization methods. On this basis, LaNi5 intermetallic compound was successfully prepared on Ni electrode. This study provides valuable theoretical guidance for the development of La alloy preparation with fluoride salt systems in industry.
研究领域:
材料科学
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电化学工程
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2019
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IF 4.175
Baolai Wang,Kaili Wei,Fuming Chen,Yinzhen Wang,Guannan He,Wei Li,Junming Liu,Qinyu He
It has been found it more difficult in completely degrading A-ring of tetracycline (TC) than completely degrading B-D rings of tetracycline. Thus, it is very necessary to find an effective route to completely degrading A-ring of tetracycline. In this work, a Z-scheme heterojuncted core-shell La(OH) 3 @BaTiO 3 composite (LB) was designed and fabricated through hydrothermal method . Many characterization techniques were employed to investigate the microstructure, phases, composition, energy band structure , and the lifetime of photogenerated carriers. In the mean time, the photocatalytic properties, including the degradation of A-ring and B-D rings of TC, as well as active species during photo-degradation were investigated. It is found that the as-prepared LB has an improved lifetime of photo-produced carriers, as well as high photocatalytic properties, being attributed to the core-shell structured heterojunction La(OH) 3 @BaTiO 3 . In addition, it is also found that ·O 2 − is more effective on degrading A-ring of TC than other active species, likely owed to the PKa3 value (3.3) of A-ring in TC. This work has supplied a route to completely degrading the A-ring of TC: rationally design and prepare a Z-scheme heterojuncted composites which supply very negative conduction band bottom potential.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
CERAMICS INTERNATIONAL
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2020
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IF 3.83
Jingxuan Li,Yu Zeng,Yihang Fang,Nan Chen,Guoping Du,Aisheng Zhang
In this work, a sol-gel method was used to synthesize nanometer-sized rutile (La + Nb) co-doped TiO 2 powders, which were employed to prepare (La + Nb) co-doped TiO 2 ceramics. The average grain size of the (La + Nb) co-doped TiO 2 ceramics was less than 200 nm, which is much smaller than that of conventionally prepared co-doped TiO 2 ceramics generally having micron-sized grains. The effect of the (La + Nb) co-doping concentration on the microstructures and dielectric properties of the obtained ceramics was studied in detail. For a 2% co-doping concentration, it was found that the (La + Nb) co-doped TiO 2 ceramic had dielectric permittivity (εʹ) higher than 2 × 10 4 for frequency up to 1 MHz and the lowest dielectric loss (tanδ) was 0.019 at 1 kHz. The electron hopping and electron-pinned defect-dipole effect was considered as the main reasons for colossal permittivity and low tanδ. This work provides a technique for the synthesis of co-doped TiO 2 nanoparticles and preparation of submicron-grain-sized co-doped TiO 2 ceramics with good dielectric properties.
研究领域:
材料科学
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电子工程
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DOI
高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
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2019
·Vol. 20
·期 11
·2694
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IF 4.183
Wenqi Li,Yubing Yong,Yue Zhang,Yingmin Lyu
Background: The LA hybrid lily ‘Aladdin’ has both excellent traits of Longiflorum hybrids and Asiatic hybrids—such as big and vivid flower, strong stem, high self-propagation coefficient, and shorter low temperature time required to release bulb dormancy in contrast to Oriental hybrids. A genome-wide transcriptional analysis using transcriptome RNA-Seq was performed in order to explore whether there is a gibberellin floral induction pathway in the LA hybrid lily. Subsequently, gene co-expression network analysis was used to analyze the possible interactions of key candidate genes screened from transcriptome data. At the same time, a series of physiological, biochemical, and cultivation tests were carried out. Results: The content of five endogenous hormones changed sharply in the shoot apex during the treatment of 200 mg/L exogenous gibberellin and the ratio of ABA/GA3dropped and stayed at a lower level after 4 hours’ treatment from the higher levels initially, reaching a dynamic balance. In addition, the metabolism of carbohydrates in the bulbs increase during exogenous gibberellin treatment. A total of 124,041 unigenes were obtained by RNA-seq. With the transcriptome analysis, 48,927 unigenes and 48,725 unigenes respectively aligned to the NR database and the Uniprot database. 114,138 unigenes, 25,369 unigenes, and 19,704 unigenes respectively aligned to the COG, GO, and KEGG databases. 2148 differentially expression genes (DEGs) were selected with the indicators RPKM ≥ 0, FDR ≤ 0.05 and |log2(ratio)| ≥ 2. The number of the upregulated unigenes was significantly more than the number of the downregulated unigenes. Some MADS-box genes related to flowering transformation—such asAGL20,SOC1, andCO—were found to be upregulated. A large number of gibberellin biosynthesis related genes such asGA2ox,GA3ox,GA20ox,Cytochrome P450,CYP81, and gibberellin signal transduction genes such asDELLA,GASA, andGID1were significantly differentially expressed. The plant hormones related genes such asNCED3and sugar metabolism related genes such asα-amylase,sucrose synthase hexokinase, and so on were also found expressing differentially. In addition, stress resistance related genes such asLEA1,LEA2,LEA4,serine/threonine protein kinase,LRR receptor-like serine/threonine protein kinase,P34 kinase,histidine kinase 3and epigenetic related genes in DNA methylation, histone methylation, acetylation, ubiquitination of ribose were also found. Particularly, a large number of transcription factors responsive to the exogenous gibberellin signal includingWRKY40, WRKY33, WRKY27, WRKY21, WRKY7, MYB, AP2/EREBP, bHLH, NAC1, NAC2, andNAC11were found to be specially expressing. 30 gene sequences were selected from a large number of differentially expressed candidate genes for qRT-PCR expression verification (0, 2, 4, 8, and 16 h) and compared with the transcriptome expression levels. Conclusions: 200mg/L exogenous GA3can successfully break the bulb’s dormancy of the LA hybrid lily and significantly accelerated the flowering process, indicating that gibberellin floral induction pathway is present in the LA lily ‘Aladdin’. With the GCNs analysis, two second messenger G protein-coupled receptor related genes that respond to gibberellin signals in the cell were discovered. The downstream transport proteins such asAMT,calcium transport ATPase, andplasma membrane ATPasewere also discovered participating in GA signal transduction. Transcription factors includingWRKY7,NAC2,NAC11, andCBFspecially regulated phosphorylation and glycosylation during the ubiquitination degradation process ofDELLAproteins. These transcription factors also activated in abscisic acid metabolism. A large number of transcription factors such asWRKY21,WRKY22,NAC1,AP2,EREB1,P450, andCYP81that both regulate gibberellin signaling and low-temperature signals have also been found. Finally, the molecular mechanism of GA floral induction pathway in the LA hybrid lily ‘Aladdin’ was constructed.Keywords:GA floral induction pathway;LA hybrid lily;transcriptome RNA-Seq;GCN;qRT-PCR
研究领域:
植物学
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遗传学
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分子生物学
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植物生理学
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DOI
PubMed
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
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2025
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IF 3.2
Zhu Xueli,Yin Xiangru,Zhang Yinan,Mei Qiqi,Bai Jinshuo,Yang Guixiang,Zhang Dequan,Liang Xiaoping
V 2 O 5 films with high ion storage capacity (Q) and wide optical modulation range (∆T) have great potential for application in electrochromic devices. In this paper, Ni-La-V 2 O 5 porous ion storage films are prepared by the sol–gel method. The effects of Ni-La co-doping content, PEG content, and heat treatment temperature on the properties of V 2 O 5 films were investigated. By comparison, it was found that the Q value of 9 mol% Ni-5.5 mol% La-V 2 O 5 film was increased compared to 9 mol% Ni-V 2 O 5 film, but ∆T was decreased. In order to improve ∆T, Ni-La-V 2 O 5 porous ion storage films were prepared using Ni-La co-doping and PEG pore-former, and the optimization of process parameters was carried out via Response Surface Methodology (RSM). The RSM results showed that the influence on the Q value was in the following order: heat treatment temperature > Ni-La co-doping content > PEG content. Under the near-optimal process parameters, a satisfying V 2 O 5 film with a high Q value (120.23 mC/cm 2 ), a good ∆T (79.8%), and a short response time (3.1 s/2.8 s) were obtained, which further demonstrated the superior electrochromic performance. Graphical
研究领域:
材料科学
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电致变色技术
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DOI
高影响因子
Analytical Methods
·
2024
·Vol. 16
·期 22
·3551-3561
·
IF 2.7
Kaigang An,Xin Li,Jia Chen,Shuang Zhang,Jing Xiao,Qing Wang,Hongdeng Qiu
Tetracycline (TC) as a broad-spectrum antibiotic, is widely used in the prevention and treatment of various bacterial diseases. However, its abuse in the livestock industry may lead to interference in human microecology, thereby causing various side effects. In this study, deep eutectic solvents (DESs) were synthesized using L-(–)-threonine (L-(–)-Thr) and cerium nitrate hexahydrate (Ce(NO3)3·6H2O), and later lanthanum nitrate hexahydrate (La(NO3)3·6H2O) was doped to synthesize La–Ce hybrid nanorods. These nanorods can be used for the determination of TC with high sensitivity and selectivity by the colorimetric method. This approach has a linear response to TC between 0.05 μM and 10 μM, with a detection limit of 0.016 μM. In this system, good dispersion provides the substance with a distinct peroxidase activity, which is used to create a colorimetric sensor for detecting TC. Mechanism studies show that the superoxide radical generated by the La–Ce nanomembrane plays a key role in peroxidase catalysis. Finally, the practicality of the method was verified by the determination of TC in food products (milk, pork and honey), which demonstrated that a good recovery rate can be obtained (91.4–102%).
研究领域:
分析化学
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食品安全
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纳米材料科学
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产品关联
DOI
PubMed
高影响因子
CARBON
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2024
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IF 10.5
Huiliang Wen,Wei Xu,Sen Lin,Aiguo Guan,Yingna Zhang,Xin Li,Chongbo Liu
As a representative magnetic oxide absorber, Fe 3 O 4 has attracted considerable research attention owing to its remarkable magnetic saturation strength as well as semiconducting properties. Doping Fe 3 O 4 with La 3+ leads to 3d-4f magnetic coupling and ion distribution changes due to the unique electron configuration and large ionic radius of La 3+ , thereby greatly enhancing the magnetic performance. However, high density, low dielectric loss, and low permeability at high frequencies inhibit the electromagnetic wave absorption (EMWA) performance of ferrites. In this study, stick-shaped Sn metal-organic framework (MOF) is in-situ grown on La 3+ -doped Fe 3 O 4 using a surfactant. After high-temperature annealing, the SnO 2 /porous carbon composites derived from Sn-MOF wrap the ferrite, forming a core-shell heterostructure, which not only prevents oxidation but also enhances the EMWA performance. Among the prepared La x Fe 3-x O 4 /SnO 2 /C (LFSC) samples, LFSC-2 (with La x Fe 3-x O 4 to Sn-MOF ratio of 1:2) exhibits strong absorption performance with a minimum reflection loss ( RL min ) of −44.1 dB. Furthermore, the gradient metamaterial based on LFSC-3 shows ultra-broadband EMWA with an effective absorption bandwidth ( RL min ≤ −10 dB) of 13.17 GHz. In addition, the LFSC-2 sample demonstrates excellent radar stealth capability in the radar cross section (RCS) far-field response, achieving an RCS reduction value of 20.4 dB∙m 2 .
研究领域:
材料科学
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电磁学
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产品关联
DOI
高影响因子
International Journal of Environmental Science and Technology
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2024
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IF 3
Xu X.,Zhu L.,Chen C.,Luo C.,Jin Z.,Sun Z.,Fu Z.T
The study employed a direct hydrothermal method to synthesize NiO/La-KTaO 3 heterojunction photocatalysts. The photocatalytic efficiency of the composites was assessed by their ability to destroy isoamyl xanthate in the presence of Ultraviolet light, mimicking the conditions seen in flotation wastewater. The results showed a significantly greater photocatalytic activity when comparing the composite catalyst to KTaO 3 . A photocatalytic reaction was performed utilizing a 40 mg NiO/K 1−x La x TaO 3 (x = 0.04) photocatalyst at pH = 3. The reaction was carried out using 50 mL of isoamyl xanthate synthesis wastewater, which had a concentration of 20 mg/L. The degradation rate achieved after 30 min was 87.28%. The addition of nickel oxide (NiO) and the introduction of La into the K lattice position were thought to facilitate charge separation, migration, and the generation of additional active sites, hence augmenting the catalytic impact. The findings from radical capture tests indicated that the ·O 2− (superoxide ion) served as the principal active species in the photocatalytic process, playing a substantial role. The process of photodegradation of isoamyl xanthate was determined through the utilization of different analytical and testing methods. This work introduces a direct and effective approach for the eco-friendly decomposition of xanthate flotation wastewater.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
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