ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2022
·Vol. 29
·期 59
·88866-88881
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IF 5.19
Xia Xuewen,Li Junqi,Chen Chaoyi,Lan Yuan-Pei,Mao Xisong,Chu Zhiyao,Ning Deyang,Zhang Junshan,Liu Fengyuan
Tuning morphology and doping additional rare earth (RE) cations are potential techniques to promote the photocatalytic performance of ceria (CeO 2 ), evaluating the collaborative effects of morphology and RE dopants is significant for producing high active ceria-based catalysts. So in this work, cubic, polyhedral and rod-like nanoceria doped with 10 mol % La (lanthanum), Y (yttrium), or Sm (samarium) were synthesized by a facile template-free hydrothermal method. Phases, morphologies, oxygen vacancies (OVs) concentration, energy band structure, photo-carriers separation/recombination, and photodegradation ratio toward methylene blue (MB) dye of as prepared ceria were studied. Results show that doped CeO 2 maintains a similar morphology structure with un-doped sample and the band gap narrows slightly. Y-doped nanoceria, with an improved separation and a reduced recombination of photo-excited electrons ( e − ) and holes ( h + ), owns a higher MB photodegradation ratio than that of samples doping with La or Sm, which is measured as 79.04, 84.43, and 85.59% for Y-doped cubic, polyhedral, and rod-like CeO 2 . The collaborative influence of morphology tuning and RE (La, Y, and Sm) doping on photocatalytic performance of nanoceria includes the effects of doped elements and the formation of OVs. The elevation of OVs concentration as well as the separation efficiency of photo-generated e − / h + are suggested to further enhance the photocatalytic performance of ceria.
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INDUSTRIAL CROPS AND PRODUCTS
·
2022
·
IF 6.449
Yan-qing Song,Sonil Nanda,Wen-jie Cong,Jie Sun,Guo-hua Dong,Aneta Magdziarz,Zhen Fang,Ajay K. Dalai,Janusz A. Kozinski
Cotton stalk was gasified to produce H 2 with Ni-La based catalysts in subcritical and supercritical water. Approximately 90% H 2 yield was obtained under optimized conditions (360 °C, 0.5 g Ni-La catalyst loading, 0.5 g biomass and 10 min) by an orthogonal design with Ni-La/spent bleaching clay (SBC) materials. In addition, the H 2 yield of rice and wheat straw increased by 41.5 and 39.5 times, respectively at optimized conditions. It was found that the activity of Ni-La materials supported on SBC ash and Al 2 O 3 was similar, with H 2 yields of 108.3% and 115.1% at 380 °C, respectively in 5 min. SBC ash provided a high specific surface area (94.4 m 2 /g) for the Ni-La catalyst. La-promoted Ni/SBC (0.19 mmol/g) had a stronger acidity than Ni/SBC (0.16 mmol/g). Ni-La/SBC had a broad reduction peak, indicating the uniform dispersion of Ni on the support. Ni-La/SBC materials not only realized the reuse of SBC but also effectively promoted the hydrothermal gasification of agricultural wastes .
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2021
·
IF 7.963
Changsong Li,Yijing Li,Qiang Li,Junling Duan,Juying Hou,Qin Hou,Shiyun Ai,Houshen Li,Yuechao Yang
Phosphates and organophosphorus cause environmental pollution , and excessive phosphate leads to water eutrophication . Glyphosate , an organophosphorus herbicide, harms the environment and human health. In this study, regenerable magnetic AL/Fe 3 O 4 /La(OH) 3 adsorbents were developed by modifying Fe 3 O 4 and La(OH) 3 on aminated lignin (AL) for phosphate and glyphosate removal. The adsorption capacity for phosphate and glyphosate reached 60.36 mg g −1 and 83.87 mg g −1 when the initial concentrations were 150 mg L −1 and 250 mg L −1 , respectively. The thermodynamic data showed that adsorption is a spontaneous and endothermic process. Adsorption can be applied at pH values ranging from 3 to 11 and is more suitable under acidic conditions. Fe 3 O 4 and La(OH) 3 both enhanced the adsorption capacities of phosphate and glyphosate. Phosphate and glyphosate compete slightly when coexisting in the adsorption process at low concentrations. Due to the magnetic properties of Fe 3 O 4 , the adsorbents can be separated rapidly and effectively with an external magnetic field. 89% adsorption capacity remained after four adsorption-desorption recycles. Thus, AL/Fe 3 O 4 /La(OH) 3 shows potential for phosphate and glyphosate removal as an effective and reusable adsorbent.
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JOURNAL OF NANOPARTICLE RESEARCH
·
2021
·Vol. 23
·期 7
·1-14
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IF 2.253
Yu Linkang,Lin Runlian,Han Yu,Fan Dehui,Zhou Guoqiang,Zhang Jinchao,Jia Guang,Ge Kun
With the wide use of rare earth nanomaterials in industry, environmental control, and medicine with their unique properties, it has focused on the exposure of humans to the rare earth nanoparticles in recent years. Because of the similar properties of rare earth and calcium, rare earth nanoparticles can deposit in the bone and affect the osteogenic differentiation of bone mesenchymal stem cells (BMSCs). La(OH) 3 nanoparticles are widely used in the catalysis, sensor, electrode, and luminescent materials. However, there are few reports about the bioactivity of La(OH) 3 nanoparticles on the bone metabolism. In this work, three La(OH) 3 nanorods have been got by hydrothermal method, Long-, Medium-, and Short-La(OH) 3 nanorods, the lengths of which were of ~ 640, 255, and 80 nm, and the diameters of which were of ~ 85, 40, and 35 nm, respectively. All the La(OH) 3 nanorods showed no effect on BMSCs viability and the blood compatibility. But the osteogenic differentiation showed a significant difference in La(OH) 3 nanorods, in which Short-La(OH) 3 nanorods showed the highest promoting effect on osteogenic differentiation. The potential mechanism in the osteogenic differentiation caused by three La(OH) 3 nanorods was correlated with the different uptake efficiency in BMSCs and degradation in lysosome to form LaPO 4 . This work on La(OH) 3 nanorods provides the basic data for the development of lanthanum-based nanoparticles. Graphical abstract
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APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2021
·Vol. 127
·期 2
·1-11
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IF 2.584
Hu Shuting,He Junfeng,Chen Fuming,Liu Bin,zhai Wangjian,He Qinyu
Constructing Z-scheme heterojunction photocatalyst with strong redox ability to make for enhanced photocatalytic performance and efficient charge separation is extremely attractive but still underdeveloped. Herein, a Z-scheme heterojunction structured La(OH) 3 @In 2 S 3 composite (labeled by “LIS”) with photocatalytic for the methylene orange (MO) degradation under simulated light irradiation has been developed. The as-prepared LIS, together with commercial La(OH) 3 and pure In 2 S 3 fabricated with the identical processing method and starting materials as those of LIS, was characterized by X-ray diffraction, UV–vis diffuse reflectance spectra, scanning electron microscopy, high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy, photoluminescence spectra and electrochemical impedance spectroscopy. The results show the heterojunction of La(OH) 3 /In 2 S 3 has prolonged the lifetime of the photo-generated carriers. The photocatalytic activity test shows that over only a small amount (0.02 g in 100 ml MO) of LIS, the photodegradation rate of 95% toward MO can be obtained in 90 min, which is about 3.4 times higher than that over pure In 2 S 3 . The active species trapping experiments indicate that there were four active species playing roles in photodegradation as the following order: e – = ∙OH < h + < ∙O 2 – . A mechanism of Z-scheme heterojunction was proposed and well explained the enhanced photocatalytic performance. This work provides a new cost-effective photocatalyst with high photocatalytic properties.
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TALANTA
·
2021
·
IF 6.057
Jing-Yan Kang,Wei Ha,Yan-Ping Shi
A novel magnetic C 3 N 5 framework material (Fe 3 O 4 /C 3 N 5 ) was developed as a high selectivity extractant for La(III) determination in food samples. The Fe 3 O 4 /C 3 N 5 material was synthesized by thermal deammoniation method and has larger surface area (100.3 m 2 g −1 ) and more effective adsorption sites compared with that of individual C 3 N 5 material (19.4 m 2 g −1 ). It was proved that Fe 3 O 4 /C 3 N 5 material displayed excellent selectivity and adsorption capacity for La(III). In addition, adsorption isotherm and kinetic data indicated that La(III) adsorption based on Fe 3 O 4 /C 3 N 5 material is a monolayer adsorption which is compatible with Langmuir model and follows a pseudo-second-order kinetic equation. By using Fe 3 O 4 /C 3 N 5 material as extractant, an analytical method was established with low limits of detection (3σ, n = 6) of 10.4 μg L −1 , reasonable recoveries ranged from 86% to 106% and good precision with the RSD less than 10.7%. The analytical method was further applied to the determination of trace La(III) in food sample. It evinced that the concentration of La(III) in sea fish is 13.2 μg kg −1 and the content of 138 La is 0.138 μg kg −1 , which is 1.03% of total La(III).
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JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2020
·Vol. 96
·期 2
·431-440
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IF 2.008
Cao Ensi,Feng Yibiao,Guo Zhaoqing,Wang Huihui,Song Guoqing,Zhang Yongjia,Hao Wentao,Sun Li,Nie Zhongquan
To further improve the ethanol sensing performance of LaFeO 3 (LFO) nanoparticles, the co-doping of acceptor and donor at La and Fe sites at equal mole amount was designed to increase the oxygen adsorbing ability of the resultant nanoparticles. A series of (La,Ba)(Fe,Ti)O 3 nanoparticles, with the designed mole ratios of Ba/La (Ti/Fe) as 0, 0.25, 0.33, 0.50, and 1.0, were prepared by a citric sol–gel method. XRD confirmed the main phase of orthorhombic LFO, and the impurity phases of cubic BaTiO 3 (BTO) and orthorhombic BaCO 3 . The incorporation of Ba and Ti into the LFO lattice was verified by the increased unit cell volume of LFO upon more doping. TEM, BET, and XPS measurements indicated that the appropriate co-doping of Ba and Ti into the LFO lattice and the simultaneous existence of BTO and BaCO 3 resulted in smaller grain size, larger BET surface area, and thus higher concentration of adsorbed oxygen species than those in the pristine LFO nanoparticle. Among all (La,Ba)(Fe,Ti)O 3 sensors, the sensor based on the (La,Ba)(Fe,Ti)O 3 nanoparticles with the designed Ba/La = 0.50 exhibited the highest gas response and sensitivity toward ethanol at the prime working temperature of 132 °C, which was ascribed to the higher surface oxygen coverage contributed by the synergistic effect of co-doping and impurity phases on the number of surface active sites and oxygen adsorbing ability.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Jiang-Bo Huo,Kiran Gupta,Changyong Lu,Hans Chr. Bruun Hansen,Ming-Lai Fu
Efficient removal of aqueous arsenic is still a great challenge in particular for producing clean drinking water and for waste water treatment. To this end, a novel magnetic porous Fe-La composite, comprising La 2 O 2 CO 3 and Fe 2 O 3 , was fabricated via a self-sacrificing template method based on bimetallic (Fe, La)-MOFs calcined at 550 °C. Batch adsorption results demonstrated that Fe-LaXY (X and Y represent the feeding mole ratio of Fe and La precursors) exhibited a maximum adsorption capacity of As(V) (241, 251 and 410 mg g −1 for Fe-La51, Fe-La21 and Fe-La11, respectively), and they also showed satisfactory adsorption kinetics, which can be ascribed to a strong coordination between La and arsenate species. Coexisting sorbates including carbonate, silicate, sulfate, and humic acid had a slight influence on adsorption performance of arsenate, while phosphate isostructural to arsenate gave severe interference. More importantly, the Fe-La11 could be easily separated from water due to its magnetism (7.0 emu g −1 ), and it also exhibited excellent recyclability (above 80% of removal efficiency at the fifth cycle) as well as stability in terms of release of Fe and La ions (< 0.5 mg L −1 at pH 4.0–10.0). Based on results from X-ray photoelectron spectroscopy (XPS), Powder X-ray diffraction (PXRD) and Raman spectroscopy, it is demonstrated that ligand exchange of surface hydroxyl groups and the formation of inner-sphere surface complexes are main responsible for the As(V) removal mechanism. Combining the magnetic properties, the absorption properties and the recyclability make Fe-LaXY derived from bimetallic MOFs promising sorbents for arsenate removal.
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Arabian Journal of Chemistry
·
2023
·
IF 6
Fulong Cheng,Yinian Wang,Yuting Fan,Dan Huang,Jie Pan,Wei Li
Biochar-based adsorbents for phosphate removal from wastewater has gained increasing attention and achieved significant progress. However, there is still much room for the enhancement on adsorption performance in terms of removal rate, adsorption capacity and pH application range. Herein, novel Ca-Al-La modified biochar adsorbents in this study were synthesized for enhancing phosphate adsorption in wastewater. The synthesis parameters of adsorbents were optimized by using the response surface methodology (RSM). The Ca-Al-La modified biochar adsorbent synthesized under the optimal conditions (CAL-MBC) exhibited superior adsorption capability towards phosphate. Specifically, CAL-MBC achieved a rapid removal rate to reach the adsorption equilibrium within 1 h, a maximum phosphate adsorption capacity of 152.9 mg/g, and excellent pH stability within a broad pH range of 3.0–11.0. The adsorption mechanisms involving electrostatic interaction, precipitation and inner-sphere complexation via ligand exchange were responsible for the excellent adsorption performance of phosphate on CAL-MBC. This study verifies CAL-MBC as a promising metal modified biochar adsorbent to enhance phosphate removal from wastewater.
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CHEMICAL ENGINEERING SCIENCE
·
2026
·
IF 5.1
Shuang Liu,Lei Ye,Shaokai Huang,Peng Zhou,Mingxuan Ma,Miao Hu,Xujin Ren,Xin Pu,Xin Han,Jichang Liu
La/ZSM-5@ASA composites were developed by a stepwise assembly strategy. • La 3+ displaced the acidic protons and generated new BAS [Si-OLa(OH) 2 -Al]. • ASA overcoat passivated external surface acid sites and enabled pre-cracking. • Hierarchical La/ZSM-5@ASA shows high light-olefin selectivity in n -paraffin cracking. Catalytic cracking of surplus automotive fuels, heavy oil and waste plastics into light olefins is an efficient resource-reutilization strategy. Conventional ZSM-5 zeolites, however, suffer from limited light-olefin selectivity and coke-induced deactivation due to strong acidity and microporous constraints. Herein, a stepwise assembly strategy involving La modification and subsequent amorphous silica-alumina (ASA) overcoating was developed to construct core–shell catalysts with optimized acidity and diffusion. La modification modulated acid strength and distribution, and DFT calculations revealed it lowered the energy barrier of the rate-determining protonation step, promoting propylene formation. The ASA overcoat, applied via co-gelation, passivated external strong Brønsted acid sites and introduced open interfacial diffusion channels. This architecture enabled pre-cracking of reactants, promoting efficient C-C bond cleavage and suppressing secondary reactions. The optimized hierarchical La/ZSM-5@ASA(1:1) achieved 63.10% total ethylene and propylene selectivity in n -heptane cracking, outperforming ZSM-5 and 0.50La/ZSM-5 by 5.12% and 1.38%, respectively. This advantage is more pronounced for longer linear hydrocarbons, and the suppression of methane and coke precursors boosts atom utilization efficiency, indicating a carbon-economic cracking pathway.
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ANALYTICA CHIMICA ACTA
·
2023
·
IF 6.2
Zewei Cui,Man He,Beibei Chen,Bin Hu
Due to the enormous interest in plants related to bioscience, environmental and toxicological research, analytical methods are expected with the ability of getting information on elemental transfer, distribution and contents in plants. In this work, a mixture of gelatin (GA) and hydroxypropyl methyl cellulose (HPMC) was prepared to simulate plant matrix, a method based on laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) with matrix-matching external calibration was proposed for direct quantification of multiple elements in plants. The composition of GA&HPMC substrate was optimized, such as the concentration of spiked nitric acid , the mass fraction of both GA and HPMC in the substrate and the mass ratio of GA: HPMC. After spiking elemental solution, coating the mixture onto a glass slide and drying overnight at room temperature , GA&HPMC substrate was obtained. The substrate obtained with GA: HPMC of 8: 2 was used to fabricate the standard series, which exhibited good elemental homogeneity and similar elemental signal intensities in LA-ICP-MS detection to that obtained for plant Certified Reference Material (CRM). CRMs of different plants including Citrus leaf (GBW10019), Tea (GBW07605), Beans (GBW10021) and Scallions (GBW10049) were further pressed into pellets and subjected to the proposed method, and the quantification accuracy was demonstrated. The limits of detections of this method were found to be 0.003 (Ce)-104 (Ca) μg g −1 , with a wide linear range (0.01–10000 μg g −1 ) for 17 target elements. The application potential of the method was further demonstrated by performing elemental imaging in Trigonotis peduncularis leaves. Rapid in-situ quantitative imaging of Zn, Cu, Sr and Mn was achieved, and the elemental quantitative distributions were discussed. The constructed substrate helped direct elemental quantification in plants. It provided a powerful and efficient tool for the investigation of the distribution and transfer of elements in plants, favoring further exploration of elemental bioavailability , transport and toxicity mechanisms.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2023
·
IF 4.3
Xi Chen,Yu Huang,Xu Wang,Haibo Li,Lin Zhu,Xinyang Xu,Shaoyan Jiang
A novel, sample and economical method was used to prepare the new co-doped TiO 2 photocatalysts and evaluated for CO 2 photoconversion under visible-light irradiation. The La(NO 3 ) 3 -TiO 2 photocatalyst was obtained by the sol–gel method and then was heat treated with different concentrations of ammonia vapor. It was found that the synergistic modification of TiO 2 photocatalyst by La(NO 3 ) 3 and ammonia vapor could improve its photocatalytic performance under visible light. The photocatalytic assessment presented a significantly amelioration in CO 2 photoconversion, giving 3.078 μmol CH 4 production in 4 h. The structures and properties of the photocatalysts were characterized and analyzed by means of XRD, SEM-EDS, HRTEM, BET, XPS, FTIR, ICP-AES, UV–vis DRS and theoretical calculation. The performance of the photocatalyst could be correlated to contributions of various phenomena such as larger specific surface area and the co-exposed (1 0 1) and (0 0 1) facets of anatase TiO 2 . Finally, the most likely substituted structures were obtained. The results of DFT + U theoretical calculation showed that La and N could modify TiO 2 by replacing surface Ti atoms and internal O atoms, respectively.
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危险品化学品经营许可证（带存储）