CHINESE JOURNAL OF CATALYSIS
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2018
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IF 3.525
Zhou Ren,Yuan Lyu,Siquan Feng,Xiangen Song,Yunjie Ding
Highly active Ir-La-S/AC catalyst was successfully prepared by co-impregnation of an activated carbon (AC) carrier with a sulfuric acid solution of Ir and La species and compared with a traditionally prepared Ir-La/AC catalyst. High angle annular dark-field-scanning transmission electron microscopy (HAADF-STEM) measurement results show that most of the Ir species on Ir-La-S/AC exist as single atomic sites, while those on Ir-La/AC exist as nanoparticles with an average diameter of 1.5 nm. Evaluation of Ir-La-S/AC as a catalyst for heterogeneous carbonylation of methanol to acetyl gave a maximum TOF (turn-over-frequency) of 2760 h −1 , which was distinctly higher than that achieved by the Ir-La/AC catalyst (approximately 1000 h −1 ). Temperature-programmed desorption of ammonia (NH 3 -TPD) result shows that the addition of sulfuric acid during the preparation procedure results in significantly more acidic sites on Ir-La-S/AC than those on Ir-La/AC, which plays a key role in the enhancement of CO insertion as the rate-determining step. Temperature-programmed reduction (TPR) and in situ X-ray photoelectron spectroscopy reveal that Ir species are more reducible, and that more Ir + might be formed by activation of Ir-La-S/AC than those on the Ir-La/AC catalyst, which is thought to be beneficial for reductive elimination of AcI from Ir 3+ species as an essential step for CH 3 I regeneration and acetyl formation.
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BIORESOURCE TECHNOLOGY
·
2018
·
IF 5.807
Taiwan Liao,Ting Li,Xiangde Su,Xiang Yu,Huiyu Song,Yi Zhu,Yuanming Zhang
A series of La(OH) 3 -modified magnetic pineapple biochar (La x -MC) with different contents of La(OH) 3 were prepared and used as phosphate adsorbents for the first time. With the increase of La(OH) 3 content, the adsorption capacity for phosphate increased while the magnetic property decreased. La10-MC exhibited excellent magnetic property for easy recovery and high adsorption capacity up to 101.16 mg P/g, which was 27 times that of pineapple biochar and much higher than most phosphate adsorbents. Adsorption isotherm and adsorption kinetics were better fitted by Langmuir model and pseudo second-order model, respectively. The removal efficiency >96.04% in coexisting ions indicated its high selectivity to phosphate. Little decrease in removal efficiency after three adsorption-desorption cycles suggested its excellent stability and cyclic utilization. Leaching study demonstrated the negligible risk of La 3+ and Fe 3+ leakage during adsorption process. Mechanism study revealed that the adsorption mechanism involved precipitation, electrostatic interaction, ligand exchange and inner-sphere complexation.
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PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2018
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IF 5.091
Weiyan Du,Yaru Li,Xing Xu,Yanan Shang,Baoyu Gao,Qinyan Yue
Bimetallic oxides nanocomposites always exhibited the better phosphate capacities than those monometallic oxides samples. Herein, the high carbohydrate-content biomaterials, shaddock peels (SP), were used as the bio-host for supporting the bimetallic oxides, zirconium (Zr) and lanthanum (La) hydroxides, forming the SP-Zr-La composites. Phosphate adsorption properties as well as stability of the novel composites were evaluated. The SP-Zr-La composites indicated that some rod-like or amorphous nanoparticles with sizes of 20–150 nm were anchored inside the SP, which exerted more available interface interactions toward the adsorbed ions. The Zr-La species were pH-sensitive and adsorption capacity of phosphate by SP-Zr-La was increased with the rise in temperature. As the molar ratio of accompanying ions/phosphate was increased from 0 to 10 times, the SP-Zr-La was observed with the adsorption loss of 27.2–36.7%. Whereas the adsorption loss of cationic SP (grafted with quaternary ammonium groups) was calculated up to 86.2–91.6%; this indicated the more feasibility of SP-Zr-La in real applications. In addition, the stability of impregnated Zr and La species in SP-Zr-La was greatly improved by the bio-carrier through the “shielding effect” in a low HA surrounding.
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PubMed
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INTEGRATED FERROELECTRICS
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2016
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IF 0.375
Dong-Wei Han,Xiu-Lan Zhang,Bing Yu,Hai-Lin Cong,Chun-Bo Mu,Hua Yuan
Three kinds of carboxyfullerenes, La@C82-COOH, C60-COOH and C70-COOH, were used to modify gold electrodes. The electrochemical behavior of dopamine (DA) at the carboxyfullerenes modified electrodes was studied using the cyclic voltammetry (CV) and differential pulse voltammetry (DPV) methods. The C70-COOH modified electrodes performed the best among them. Under the optimal conditions, linear CV and DPV responses to DA concentration from 1 μmol/L to 13 μmol/L were observed, and the detection limit of DA was 1×10−2 μmol/L in the presence of 10 μmol/L uric acid (UA). The practical analytical utilities of the C70-COOH modified electrodes were demonstrated by the determination of DA HCl in the real samples of dopamine hydrochloride injection (DHI). Moreover, the modified electrodes exhibited good reproducibility and sensitivity, demonstrating its feasibility for analytical purpose.
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RSC Advances
·
2016
·Vol. 6
·期 42
·35859-35867
·
IF 3.289
Pinghua Chen,Weibo Zhang,Menglin Li,Peng Ai,Lei Tian,Hualin Jiang
A novel magnetic composite of La–Zr was prepared by co-precipitation method, and its fluoride removal ability was investigated in batch studies. The sample was characterized by SEM, EDS and FTIR. Influence of various factors such as pH, presence of coexisting anions, contacting time and initial fluoride concentration were studied in detail by batch sorption experiments. The equilibrium data fitted to Langmuir, Freundlich and Lan–Fre isotherm model, and the maximum sorption capacity was calculated to be 88.5 mg g−1, which is higher than lots of previous adsorbents. The kinetic data can be described well by the pseudo-second-order kinetic model. It was indicated that the overall rate of fluoride sorption is likely to be controlled by chemisorption process. Based on the results, the mechanism of adsorption was discussed in detail. There is no calcination in the preparing process, so this material is considered to be lower cost as compared with some metal elements-based oxides adsorbents, and is beneficial for the practical application.
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THERMOCHIMICA ACTA
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2017
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IF 2.236
Siyu Wang,Yini Li,Jie Wang,Shaoxu Wang,Quan Shi,Zhicheng Tan
We found a new way to prove the interaction between the two components in polyaniline (PANI-DTA)/La composites by studying the specific heat. It is firstly found that PANI-DTA has a phase transition peak at −50 °C. The composites (PLa) have no phase transition at −50 °C, so the thermal, magnetic and electrochemical properties are different from PANI-DTA. The heat capacities of the composites are higher than that of PANI-DTA and La complex. the magnetic field dependence of magnetization (M–H) curves of PANI-DTA and PLa-2 exhibit saturation magnetization and a hysteresis loop. The electrochemical performance of the composites are greatly improved compared with PANI-DTA and La complex.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
·
IF 8.1
Jianshe Zhang,Chunling Zheng,Yingjie Wang,Tingting Zhai,Yanghuan Zhang,Dianchen Feng
This research paper explores the influence of varying the quantity of La–Ni@3DG catalyst on the hydrogen storage capabilities of MgH 2 . La–Ni@3DG catalyst was prepared using lanthanum chloride heptahydrate and nickel chloride hexahydrate as raw materials combined with three-dimensional graphene, then mixed with MgH 2 via ball milling to prepare MgH 2 + x wt.% La–Ni@3DG ( x = 0, 3, 5, 7) composite alloy. X-ray diffraction analysis showed that the composite alloy was mainly composed of the MgH 2 phase, with the presence of Mg and (La, Ni) phases detected. With increased La–Ni@3DG addition, the broadening of the MgH 2 diffraction peak significantly improved, indicating the catalyst promoted alloy phase structure uniformity and crystallinity. The composite alloy forms new phases such as LaH 3 , LaNi 3 H 6 , and Mg 2 NiH 4 during hydrogen absorption. These phases cooperate with in-situ formed LaH 3 and Mg 2 Ni to significantly improve the reversible hydrogen absorption and desorption properties of MgH 2 . Adding La–Ni@3DG catalyst has a significant positive effect on the hydrogen absorption and desorption of MgH 2 , leading to a considerable improvement. At 553 K, the composite alloy reaches hydrogen absorption equilibrium faster than pure MgH 2 , and the temperature for hydrogen absorption is significantly reduced to 373 K. The dehydrogenation performance is also improved, with 5 wt.% La–Ni@3DG is showing the best dehydrogenation performance at 553 K. The initial dehydrogenation temperature commences at approximately 505 K, while the dehydrogenation activation energy attains its minimum value: a remarkably low 109.91 kJ/mol H 2 . Additionally, the addition of catalyst reduces the pressure of the hydrogen absorption and desorption platform, effectively reducing the hysteresis effect during hydrogen absorption and desorption when the catalyst content is 5 wt.%, the enthalpy change and entropy change of the composite alloy reach a minimum, −70.45 kJ/mol H 2 and 74.38 kJ/mol H 2 (hydrogen absorption), −101.93 J/K/mol H 2 and 103.68 J/K/mol H 2 (hydrogen desorption), respectively.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Hongfei Ma,Yanfang Huang,Jiaan Tang,Wenjuan Wang,Bingbing Liu,Hu Sun,Shuzhen Yang,Guihong Han
Herein, the morphology of a La metal–organic framework (La-MOF) was modified from aggregated granules to a reticular structure possessing a large specific surface area by altering the solvothermal temperature. Thereafter, the La-MOF was applied as an adsorption carrier for fluoride ions removal. Batch adsorption experiments indicated that the morphological structure of La-MOF considerably affects its adsorption performance. The maximum adsorption capacity of the La-MOF-130 comprising the highest dispersion of the reticular structure for fluoride ions was 142.86 mg/g, which was 28.29 % higher than that of the granular-structured La-MOF. Furthermore, La-MOF-130 exhibited an excellent adsorption performance and strong affinity for fluoride ions in a broad pH range (3–10) and a short adsorption time (60 min). The pseudo-second-order kinetic and Langmuir adsorption isotherm models indicated that fluoride ions adsorption of La-MOF was dominated by monomolecular layer chemisorption. Furthermore, Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy analyses revealed that the coordination exchange and electrostatic attraction were the interaction mechanism between La-MOF and fluoride ions. Moreover, an efficient solid–liquid separation of the adsorption aggregates (La-MOF-F) and removal of fluoride ions were accomplished via microbubble flotation under the action of the anionic surfactant sodium dodecyl sulfate. The fluoride ions adsorption efficiency was 95.57 % and the solid–liquid separation efficiency was 99.08 %. The research results indicate that the La-MOF carrier adsorption flotation method has broad application prospects in industrial wastewater treatment.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2024
·Vol. 35
·期 34
·1-13
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IF 2.8
Xu Jialing,Jing Haofeng,Hou Xiong,Feng Hengheng,Yu Hongtao
For capacitor applications, Ba(Sm 1- x - y La x Bi y ) 2 Ti 4 O 12 dielectric ceramics with La/Bi co-substitution for Sm were prepared using the conventional solid-state method. Part of Sm 3+ was found to be replaced by La 3+ and Bi 3+ in ceramics that exhibit an orthorhombic tungsten bronze structure. As the concentration of Bi 3+ increased, a second phase of Bi 4 Ti 3 O 12 was observed. The co-substitutions could reduce the sintering temperature and effectively increase the dielectric constant from 80 to 140. The dielectric loss increased slightly with increasing La 3+ and Bi 3+ , but it still remained below 0.1% at 1 kHz. After sintering, a specific composition was achieved with x = 0.1 and y = 0.4. It has a high dielectric constant of 132, an ultra-low dielectric loss of approximately 0.06%, and excellent frequency stability. Additionally, it exhibits a capacitance-temperature change of ± 1% at 1 kHz over a temperature range of − 55 to 125 °C.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Huiyu Yi,Chenge Liang,Yungui Li,Haoran Niu,Suorong Zhang,Moudong Hu,Wenhai Huang,Qile Fang
Prussian blue analogs (PBAs) are promising catalysts in heterogeneous oxidation processes. The catalytic activity of PBAs relies on exposed crystal facets and accessible active sites on the PBA framework. Employing a heteroatom doping strategy using a rare earth element (La), we regulated the crystal structure and optimized the catalytic activity of CoFe PBA for peroxymonosulfate (PMS)-driven degradation of the antibiotic norfloxacin (NOR). The La atoms were mainly doped in the interstitial sites of the CoFe PBA cubic lattices, without affecting the electron distributions of Co and Fe metals or the face-centered cubic crystal phase of the coordination skeleton. La doping dominated the (1 1 1) and (1 0 0) as the main exposed facets of CoFeLa PBA, increasing the affinity of CoFeLa PBAs for PMS adsorption due to the higher surface energy of the two facets. Consequently, the activation energy considerably declined from 77.57 kJ/mol in CoFe PBA to 51.66 kJ/mol in CoFeLa PBA and the catalytic activity for PMS-driven NOR degradation was largely improved, which can reach 76.4 % removal of NOR within 15 min, with an increased initial rate constant k of 0.095 min −1 . 1 O 2 was proven as the main reactive specie responsible for NOR degradation in the PMS/CoFeLa system, and O 2 · − and SO 4 · − were verified as the important intermediates to generate 1 O 2 . Thus, La doping can effectively enhance the catalytic performance of PBA-based catalysts for organic pollutant removal.
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ChemistrySelect
·
2024
·Vol. 9
·期 22
·e202302785
·
IF 1.9
Junfeng Wang,Qimeng Liu,Jichao Zhu,Lifang Hu,Jie He
Graphical A series of lanthanum-doped ZnCr-layered double hydroxide (La/ZnCr-LDH) photocatalysts were successfully synthesized by a facial hydrothermal method and their photocatalytic activity for degradation tetracycline hydrochloride (TCH) were evaluated under visible light irradiation. The photocatalyst with La doping content of 10 % (molar ratio La 3+ /(La 3+ +Cr 3+ ), La/ZnCr-LDH-10) has optimal performance for TCH removal (87.2 %) among all synthesized photocatalysts. Radical trapping experiments and Valence Band-XPS (VB-XPS) were used to propose a possible photocatalytic degradation process for TCH by La/ZnCr-LDH-10 photocatalyst. A series of lanthanum-doped ZnCr-layered double hydroxide (La/ZnCr-LDH) photocatalysts were successfully synthesized by a facial hydrothermal method and their photocatalytic activity for degradation tetracycline hydrochloride (TCH) were evaluated under visible light irradiation. The structure and physicochemical properties of the as-synthesized photocatalysts were well characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), Brunauer-Emmett-Teller (BET), X-ray photoelectron spectrometer (XPS), and UV-vis absorption spectroscopy. The photocatalyst with La doping content of 10 % (molar ratio La 3+ /(La 3+ +Cr 3+ ), La/ZnCr-LDH-10) has optimal performance for TCH removal (87.2 %) among all synthesized photocatalysts. Radical trapping experiments and Valence Band-XPS (VB-XPS) were used to propose a possible photocatalytic degradation process for TCH by La/ZnCr-LDH-10 photocatalyst. This strategy can be used to modify other photocatalysts for efficient removal of organic pollution in the environment.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Chenge Liang,Qingqing Li,Qile Fang,Yuigui Li,Wenhai Huang,Shihao Miao,Yi Shen,Feilong Zhu,Qishang Li,Jining Liu
Deep dephosphorization of mariculture tailwater, a typical high-salinity and weakly alkaline wastewater, is difficult but essential for meeting ever-stricter stringent emission standards. Herein, we developed an alkaline-conversion method to prepare lanthanum-based metal organic framework (La–MOF) derivatives for efficient phosphate removal from mariculture tailwater. During the templated alkaline-conversion process, the strong-alkaline regent gradually broke the coordination bonds of La–MOF while maintained its macrostructure, and the La nodes liberated from the framework were then crystallized into La(OH) 3 . The universality of this conversion method was verified on other La–MOF precursors with different benzoic multicarboxylate ligands. Importantly, numerous mesopores were formed in the derivative interior, increasing the number of exposed active La sites and accessible transfer channels. Therefore, the derivative exhibited superior phosphate-adsorption performance with a high adsorption capacity (Langmuir Q 0 : 155.7 mg P/g) and a rapid adsorption rate. The obtained La–MOF derivative with stable structure had broad neutral–alkaline pH range adaptability, which was demonstrated satisfactory dephosphorization selectivity and high cyclic performance under different seawater conditions (coexisting anions, cations, H 3 BO 3 and natural organic matter). Finally, the obtained mesopore-rich La–MOF derivative exhibited an excellent deep dephosphorization capacity for actual mariculture tailwaters collected from seven mariculture ponds. The reactive phosphate level was quickly reduced to an ultra-low effluent concentration (<0.05 mg P/L), demonstrating the promising application potential of the La–MOF derivative.
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