INORGANIC CHEMISTRY COMMUNICATIONS
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2023
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IF 3.8
Chuncheng Shi,Zhixin Zhao,Ling Zhao,Aparna Kushwaha,Abhinav Kumar,Jun Wang,Ying Pan,Mohd. Muddassir,Qian Lan
Organic dyes are typical chemical reagents that find applications in printing, textile, leather, and other industries. However, their overuse and uncontrolled discharge in water bodies have a negative impact on the aquatic ecosystem and humans. Metal-organic frameworks are assorted multifunctional materials that find potential application as photocatalysts. In this work, the application of two porphyrin-based metal-organic frameworks (TCPP-La and Fe-TCPP-La) have been reported as photocatalytic materials to degrade dyes methyl orange (MO) and methylene blue (MB). The results suggest that TCPP-La can eliminate 16 % MO and 23.7 % MB in 125 min under UV irradiation of 385 nm. On the other hand, only 4.8 % MO and 16 % MB were removed by Fe-TCPP-La under the same condition. However, when hydrogen peroxide (2 % H 2 O 2 ) was added to the reaction medium, the degradation activity of TCPP-La was improved upto 26 % for MO and 61 % for MB, while, Fe-TCPP-La exhibits more enhancement in photocatalytic degradation upto 55 % for MO and 93 % for MB. The result implied that introducing ferric ions using post-synthetic strategy to engender both lanthanum and iron centers into the framework could improve the photocatalytic performance of the MOF against dye photodegradation.
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高影响因子
FUEL
·
2023
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IF 7.4
Wenqi Zhao,Xiaowei Bai,Xiangrui Lin,Yalkunjan Tur sun,Mei Zhong,Zhenghua Dai,Jian Li
Biomass-derived furfural and its derivatives are promising feedstocks for producing valuable C 5 diols by catalytic hydrolysis. However, this process requires selective ring opening of tetrahydrofurfuryl alcohol (THFA) to 1,5-pentanediol, which is challenging. Here we report efficient route for this conversion using Ni-La(OH) 3 catalysts prepared by a green co-precipitation-hydrothermal method. We show that these catalysts can achieve up to 91.7% yield and 94.6% selectivity of 1,5-pentanediol from THFA under mild conditions. We elucidate the key role of the La(OH) 3 phase, the basic sites and the Ni n+ -O-La 3+ structure of the catalysts in promoting the selective hydrogenolysis and ring opening of THFA. We also demonstrate that the co-dehydrogenation of secondary alcohols enables lower reaction pressure and longer catalyst lifetime. Our work provides a sustainable and environmentally benign approach for producing 1,5-pentanediol from biomass-based furfural and its derivatives, which has potential applications in polymer synthesis and green chemistry.
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Journal of Saudi Chemical Society
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2022
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IF 4.712
Tao Chen,Ning Sun,Yuan Zhao,Jie Gao,Guowen Hu,Xiaobing Han,Yayang Tian,Linfeng Chen,Guobao Huang,Bing Li
A new aminophosphonic acid chelating resin was successfully prepared via electron beam irradiation grafting combined with chemical modification and used for the efficient removal of La(III). Firstly, glycidyl methacrylate (GMA) was grafted to polystyrene microspheres (PS) via electron beam co-radiation to obtain PS-PGMA microspheres, then followed by the amination with diethylenetriamine (DETA) to formed PS-PGMA-DETA (PGD) microspheres through nucleophilic substitution between amino and epoxy group, and finally PS-PGMA-DETA-PA (PGDP) microspheres was obtained by phosphorylation with phosphorous acid (PA). The obtained chelating resin absorbent was characterized by Fourier-transform infrared (FT-IR), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), which demonstrated that the millimetric aminophosphonic acid chelating resin were successfully prepared with well-defined morphology and enhanced thermal stability. The X-ray photoelectron spectroscopy (XPS) characterization results confirmed a possible adsorption mechanism, which is mainly based on the chelation and coordination of N and O in PDGP with La(III) in the solution. A series of parameters were taken into account in the adsorption experiment, such as absorbed dose, GMA concentration, dosage of PGDP, pH, contact time, temperature, and the initial concentrations of La(III). The maximum adsorption capacity obtained from the research can be achieved 288.69 mg/g at 298.15 K, pH = 6. The kinetic sorption for for La(III) fitted the type 1 pseudo-second-order (R 2 = 0.9981), which revealed that the La(III) are chemisorbed on the surface of the PGDP. It was concluded that the La(III) adsorption conformed to the Freundlich equation, indicating a multilayer adsorption process. Thermodynamic data indicated that the La(III) uptake process was a spontaneous and endothermic. In addition, this research provided a new irradiation grafting method for rare earth ions removal.
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高影响因子
International Journal of Environmental Research and Public Health
·
2022
·Vol. 19
·期 22
·14835
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IF 4.614
Jinkai Shu,Bozhi Ren,Wei Zhang,An Wang,Sen Lu,Shuyu Liu
Modified Shell Powder/La-Fe-TiO2(La-Fe-TiO2@MSP) composites were fabricated using the sol-gel method and characterized by SEM, XRD, UV-vis DRS and photocurrent techniques, and their physicochemical and optical properties were analyzed. The effects of various factors on the photocatalytic degradation of pyridine and its reaction kinetics were investigated by batch experiments using pyridine, a typical nitrogen-containing heterocyclic compound in coal chemical wastewater, as the target removal species. The pyridine degradation rate of 80.23% was obtained for 800 mg/L composite solution by photocatalytic oxidation of 50 mg/L pyridine wastewater for 180 min at 35 °C, pH = 8 and light intensity of 560 W. The photocatalytic degradation performance was optimal. The quenching experiments determined that the active species of photodegradation were mainly hole and hydroxyl radicals, and the photocatalytic degradation mechanism was analyzed in this way.Keywords:La-Fe-TiO2@MSP;photocatalysis;pyridine;reaction kinetics
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PubMed
高影响因子
APPLIED CATALYSIS A-GENERAL
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2022
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IF 5.723
Weitao Wang,Ruoxin Wang,Xulu Jiang,Zhen-Hong He,Kuan Wang,Yang Yang,Zhao-Tie Liu
It is desirable but challenging to explore non-noble metal based catalyst for the solvent-free aerobic oxidation of benzyl alcohol to benzaldehyde. La y Co 1 O x was prepared through a co-precipitation method, which exhibited excellent catalytic performance for titled reaction with a yield of 73.1% and selectivity of 99.6%. Introduction of La in the Co 3 O 4 can modify the electronic property of Co, improving the surface Co 3+ content and enhancing the activity. The synergistic effects of La and Co in the bimetallic catalysts are kinetically discussed. In addition, the kinetic and experimental studies revealed that the generated water favors the selectivity but suppresses the activity for the titled reaction. It is found that good activity and excellent selectivity for the (heterocyclic)aromatic alcohols aerobic selective oxidation over the bimetallic catalyst were obtained.
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NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 40
·18818-18824
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IF 3.3
Yaoxia Yang,Xingwei Guo,Mi Kang,Dangxia Wang,Zhiwang Yang
Developing efficient and inexpensive catalysts for the hydrogen evolution reaction (HER) is critical for the commercial viability of electrochemical sustainable energy technologies. In this study, a La-CoP/Co(OH)2 nanoarray supported on nickel foam (NF) was successfully prepared using the secondary hydrothermal and low-temperature phosphating method. The as-prepared La-CoP/Co(OH)2/NF material exhibited excellent hydrogen evolution performance in 1 M KOH solution. The overpotential of La-CoP/Co(OH)2/NF was 114 mV at the current density of 10 mA cm−2, and the Tafel slope was estimated to be 99 mV dec−1. The decoration of Co(OH)2 nanosheets on La-CoP nanorods with the textured surface not only provides a large surface area and more active sites but also promotes the transfer of electrons between Co(OH)2 and La-CoP, which accelerates the reaction rate and further improve the HER performance of the composite material. Additionally, the fabricated catalyst exhibits good stability and durability in alkaline media. This approach provides a feasible and effective strategy for exploring electrocatalysts with high efficiency and low prices for the electrolysis of water.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
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IF 8.128
Xiangcheng Shan,Liyu Yang,Yumeng Zhao,Huarong Yang,Zuoyi Xiao,Qingda An,Shangru Zhai
Recently, biochar-related phosphate sorbents have been extensively investigated and achieved significant progress; however, there is still much room for enhancement on capturing performance and recovery of powdery ones after sorption. Herein, a new kind of adsorbent, in which biochar/Mg-Al spinel encapsulated in carboxymethyl cellulose-La hydrogels with cationic polymeric layers, was fabricated, aiming for integrating multi-advantages of each component for enhanced phosphate capture. Batch static experiments were correlated to the phosphate adsorption performance of the adsorbent. The maximum phosphate adsorption capacity of the adsorbent was 89.65 mg P/g at pH = 3. The Langmuir isotherm model and the pseudo-second-order kinetic model fitted well with the adsorption behavior of the adsorbent. More importantly, this composite adsorbent that integrated with biochar, Mg-Al spinel, cationic polymeric components exhibited favorable selectivity over coexisting anions (Cl - , SO 4 2- , HCO 3 – and NO 3 – ) and performed good reusability after five consecutive cycles. By virtue of the bead-like feature, fixed-bed column experiments demonstrated that the Thomas model fitted the breakthrough curves well under varied experimental conditions. The adsorption mechanism of phosphate on the designed composite adsorbent with multi-components could be described as the electrostatic attraction, ligand exchange and inner-sphere complexation, which might account for the efficient phosphate capturing performance.
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PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
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IF 4.539
Jie Xu,Yongmei Cui,Rui Wang,Ziyi Shi,Chunxing Wu,Dongxiang Li
La-based nanorods with large mesopores were synthesized at a low temperature (35 °C) in a reverse surfactant-free microemulsion (SFME). The SFME consisted of hydrophilic ionic liquid (IL) propylammonium formate (PAF), hydrophobic IL 1-butyl-3-methylimidazolium hexafluorophosphate (bmimPF 6 ), and protic IL diethylammonium formate (DEAF), corresponding to the water phase, oil phase, and amphi-solvent, respectively. This IL-SFME, as a new microemulsion, was formed by the three ionic liquids without any volatile organic solvents . The morphology and properties of the La-based material were investigated utilizing transmission electron microscope , X-ray diffraction, infrared spectroscopy , thermogravimetric analysis , specific surface analysis , and zeta potential measurements. The obtained complex was lanthanum methanoate La(COOH) 3 which exhibited a large specific BET surface area (47.71 m 2 /g) and high pH pzc (11.63), assuming a remarkable removal ability on phosphate in aqueous solutions within a wide range of pH values. This paper presents a facile, non-toxic, and energy-efficient route of the material, owing to the absence of both surfactant and high temperature treatment usually adapted in other literatures. The adsorption of the La(COOH) 3 nanorods for phosphate was investigated by changing adsorbent dosage, initial phosphate concentration, contact time, and pH value. The sorption kinetics and isotherms of phosphate on the La-based adsorbent could be explained by the pseudo second-order and Langmuir model, respectively. The maximum adsorption capacity of the product was 381.6 mg PO 4 3– /g, evidently higher than usual phosphate adsorbents. The study on the mechanism revealed that the adsorption mainly comes from the precipitation, electrostatic interaction, and ligand exchange. The adsorbed phosphate could nearly be desorbed by NaOH solution for reusability. To summarize, the synthesized mesoporous La-based nanorods unfolds a promising application in the phosphate adsorption.
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Journal of Environmental Chemical Engineering
·
2020
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IF 4.3
Yi Cheng,Jilin Zhang
Excessive phosphate in wastewater can cause eutrophication of water body, which will worsen the ecological environment and threaten human health and biological life safety. Adsorption of phosphate is the most effective way to remove phosphate, and efficient adsorbent is the key. Amorphous La(OH) 3 has been deemed as a potential phosphate adsorbent on account of high adsorption capacity and environmentally friendly property. However, it also shows some disadvantages such as easy agglomeration, poor water dispersion. In this study, UiO-66-NH 2 was used as carrier to load amorphous lanthanum hydroxide as an adsorbent for phosphate removal. The adsorbent (UiO-66-NH 2 @La(OH) 3 , ULCs) has good water dispersibility and it is easy to be separated and recovered. At the same time, the maximum phosphate adsorption capacity can reach 140.7 mg P/g. The adsorption process accords with pseudo second order kinetic model and Freundlich isotherm model. The thermodynamic results showed that the adsorption process was spontaneous and endothermic. In addition, in the presence of coexisting anions (such as Cl − , SO 4 2− , NO 3 − ), it also exhibited high selectivity and phosphate removal efficiency. Meanwhile, the adsorption capacity keeps at a high level in the range of pH 3–11. By the merit of above-mentioned properties, the prepared material is expected to be an ideal candidate for phosphate removal from contaminated water.
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Journal of Inorganic and Organometallic Polymers and Materials
·
2020
·Vol. 31
·期 1
·375-383
·
IF 1.941
Xu Gengsheng,You Fangfang,Li Xu
Considering the accelerated charge/mass transfer and the formation of active defects at the heterointerface, La-ZnO/g-C 3 N 4 heterogeneous photocatalysts were facilely prepared via a two-step route consisting of hydrothermal and calcination processes in this work. The combination of La 3+ doping in ZnO and the contact between La-ZnO and g-C 3 N 4 endowed the heterogeneous composite with a much enhanced photocatalytic activity towards methyl blue (MB) dye decolorization under the visible light irradiation. It was found that La-ZnO/g-C 3 N 4 -4.6 showed an optimal degradation rate of MB (8.72 × 10 − 2 min − 1 ), which is 14 times higher than that of pure g-C 3 N 4 (6.23 × 10 − 3 min − 1 ) under the same experimental conditions. The improved photocatalytic MB decolorization is attributed to the increased interfacial electron-hole separation efficiency through constructing La-ZnO/g-C 3 N 4 heterogeneous interfaces. The present study manifests the advantage of heterogeneous interfaces as the charge carrier separation pathway towards boosting photocatalytic activity.
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Inorganic Chemistry Frontiers
·
2020
·Vol. 7
·期 12
·2343-2351
·
IF 5.958
Ran Wang,Guoan Lin,Xiaoxiang Xu
La/Zr co-doped SrTaO2N has been investigated as visible-light-active photocatalysts for water reduction. Unlike previous aliovalent doping that leads to a decrease in light absorption, La/Zr co-doping largely preserves the visible light absorption of SrTaO2N. More importantly, the La/Zr co-doping not only helps to improve surface hydrophilicity and reduce particle sizes but also effectively inhibits defect formation (e.g. Ta4+) in SrTaO2N. These modifications are responsible for significant enhancements in photocatalytic H2 production. AQE as high as 0.84% was achieved at 420 ± 20 nm for Sr0.4La0.6Ta0.4Zr0.6O2N (x = 0.6), which also showed good durability and stability. Further analysis suggests that La/Zr co-doping negatively shifts the conduction band edge positions of SrTaO2N and contributes to better charge separation conditions.
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CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Jitong Wang,Xinru Nie,Zhanhui Peng,Xiaoping Lei,Pengfei Liang,Zupei Yang,Xiaolian Chao
Lead-free antiferroelectric (AFE) NaNbO 3 (NN) is one of promising materials for dielectric capacitors, but the recoverable energy-storage density and efficiency get restrained owing to huge remanent polarization and limited dielectric breakdown field strength . In this work, a variety of NN based lead-free bulk (1- x )NaNbO 3 - x La(Mn 0.5 Ni 0.5 )O 3 (abbreviated as (1- x )NN- x LMN, x = 0, 0.05, 0.10, 0.15, 0.20) ceramics were designed using a solid-state synthesis method. Remarkably, an ultra-fast charge-discharge speed 47 ns and an acceptable recoverable energy-storage density W rec ~1.77 J/cm 3 with a high efficiency η = 77% were obtained under the E b of 200 kV/cm at x = 0.05. The superior energy storage performance is attributed to the regulation of domain size and voltage resistance by special ions substitution of A and B sites. This work not only proposes an efficient strategy to realize high recoverable energy-storage density and efficiency, but also provide an candidate material for application of advanced pulsed power capacitors.
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