Polymers
·
2023
·Vol. 15
·期 1
·248
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IF 5
Yao Lu,Xuna Jin,Xiang Li,Minpeng Liu,Baolei Liu,Xiaodan Zeng,Jie Chen,Zhigang Liu,Shihua Yu,Yucheng Xu
Superparamagnetic Fe3O4particles have been synthesized by solvothermal method, and a layer of dense silica sol polymer is coated on the surface prepared by sol-gel technique; then La(OH)3covered the surface of silica sol polymer in an irregular shape by controlled in situ growth technology. These magnetic materials are characterized by TEM, FT-IR, XRD, SEM, EDS and VSM; the results show that La(OH)3nanoparticles have successfully modified on Fe3O4surface. The prepared Fe3O4@La(OH)3inorganic polymer has been used as adsorbent to remove phosphate efficiently. The effects of solution pH, adsorbent dosage and co-existing ions on phosphate removal are investigated. Moreover, the adsorption kinetic equation and isothermal model are used to describe the adsorption performance of Fe3O4@La(OH)3. It was observed that Fe3O4@La(OH)3exhibits a fast equilibrium time of 20 min, high phosphate removal rate (>95.7%), high sorption capacity of 63.72 mgP/g, excellent selectivity for phosphate in the presence of competing ions, under the conditions of phosphate concentration 30 mgP/L, pH = 7, adsorbent dose 0.6 g/L and room temperature. The phosphate adsorption process by Fe3O4@La(OH)3is best described by the pseudo-second-order equation and Langmuir isotherm model. Furthermore, the real samples and reusability experiment indicate that Fe3O4@La(OH)3could be regenerated after desorption, and 92.78% phosphate removing remained after five cycles. Therefore, La(OH)3nanoparticles deposited on the surface of monodisperse Fe3O4microspheres have been synthesized for the first time by a controlled in-situ growth method. Experiments have proved that Fe3O4@La(OH)3particles with fast separability, large adsorption capacity and easy reusability can be used as a promising material in the treatment of phosphate wastewater or organic pollutants containing phosphoric acid functional group.Keywords:superparamagnetic;Fe3O4@La(OH)3inorganic polymer;phosphate adsorption
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Chemical Engineering and Processing-Process Intensification
·
2018
·
IF 2.826
Yanyan Guo,Chengna Dai,Zhigang Lei
A series of Pd-La/SiO 2 /cordierite (cordierite = COR) and Pd-Zn/SiO 2 /COR bimetallic monolithic catalysts were prepared, characterized, and tested for the hydrogenation of 2-ethylanthraquinone (eAQ) as the key step of anthraquinone method for production of H 2 O 2 . It was found that the metal particle size is remarkably dependent on the Pd/M (M = La, and Zn) mass ratio of bimetallic monolithic catalysts. By virtue of its small metal particle size and the strong interaction, the 0.8% Pd-0.4% La/SiO 2 /COR monolithic catalyst presents the highest H 2 O 2 yield (7.7 g L −1 ) and selectivity toward active quinones (95%), which is attributed to the addition of La leading to the synergistic effect between Pd and La. Moreover, the density functional theory (DFT) calculations for the adsorption of eAQ over the surface of Pd-La/SiO 2 /COR and Pd-Zn/SiO 2 /COR bimetallic monolithic catalysts have been conducted to further understand the mechanism of molecule–surface interactions between eAQ and the PdM(1 1 1) or Pd(1 1 1) surfaces. Detailed studies showed that the high catalytic activity of Pd-La/SiO 2 /COR bimetallic monolithic catalyst is attributed to the stronger adsorption between Pd 3 La 1 (1 1 1) and the carbonyl group of eAQ.
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CATALYSIS COMMUNICATIONS
·
2017
·
IF 3.33
Baohuai Zhao,Rui Ran,Li Sun,Zesheng Yang,Xiaodong Wu,Duan Weng
A high-surface-area La-Ce-Mn mixed oxide was synthesized by citrate method, with further acid etching to dissolve the La 3 + ions in the lattice. The acid etching process efficiently improved the specific surface area, increased the ratios of Mn 4 + /Mn n + , Ce 3 + /Ce n + , O α /O tot , and enhanced the oxygen mobility of the catalyst, which were responsible for the superior catalytic performance. Compared to the pristine La 0.8 Ce 0.2 MnO 3 + δ catalyst, the etched one could convert CO and C 3 H 8 more efficiently, with 90% conversion of CO and C 3 H 8 at only 73 and 196 °C, respectively. Such superior catalytic performance made it possible to be used for automotive emission control during cold-start period.
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Journal of Environmental Sciences
·
2016
·
IF 2.208
Zhuowei Cheng,Zhiqi Gu,Jianmeng Chen,Jianming Yu,Lingjun Zhou
The photocatalytic oxidation of gaseous chlorobenzene (CB) by the 365 nm-induced photocatalyst La/N–TiO 2 , synthesized via a sol–gel and hydrothermal method, was evaluated. Response surface methodology (RSM) was used to model and optimize the conditions for synthesis of the photocatalyst. The optimal photocatalyst was 1.2La/0.5N–TiO 2 (0.5) and the effects of La/N on crystalline structure, particle morphology, surface element content, and other structural characteristics were investigated by XRD (X-ray diffraction), TEM (Transmission Electron Microscopy), FTIR (Fourier transform infrared spectroscopy), UV–vis (Ultraviolet–visible spectroscopy), and BET (Brunauer Emmett Teller). Greater surface area and smaller particle size were produced with the co-doped TiO 2 nanotubes than with reference TiO 2 . The removal of CB was effective when performed using the synthesized photocatalyst, though it was less efficient at higher initial CB concentrations. Various modified Langmuir-Hinshelwood kinetic models involving the adsorption of chlorobenzene and water on different active sites were evaluated. Fitting results suggested that competitive adsorption caused by water molecules could not be neglected, especially for environments with high relative humidity. The reaction intermediates found after GC–MS (Gas chromatography–mass spectrometry) analysis indicated that most were soluble, low-toxicity, or both. The results demonstrated that the prepared photocatalyst had high activity for VOC (volatile organic compounds) conversion and may be used as a pretreatment prior to biopurification.
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APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Yahui Zhang,Xiaoyan Lin,Quisheng Zhou,Xuegang Luo
The magnetic core-shell Fe 3 O 4 @Alg-La particles were fabricated successfully by a simple method of electro-coextrusion, and employed as an adsorbent for separation of fluoride from aqueous solution. Main factors affecting the removal of fluoride, including pH, adsorbent dosage, initial concentration, temperature and contact time were investigated. The adsorption isotherm and adsorption kinetics were studied to understand the adsorption process in detail. The experimental data were fitted well by the non-linear Freundlich isotherm and linear pseudo-second-order model, the maximum fluoride adsorption capacity was 45.230 mg/g at pH 4, 298.15 K. Thermodynamic parameters indicated that the fluoride adsorption process was feasible and spontaneous. The presence of other anions like Cl − , SO 4 2− , HCO 3 − and PO 4 3− had almost no effect on the fluoride adsorption. The adsorbent can be easily separated from the solution by a magnet. The magnetic core-shell Fe 3 O 4 @Alg-La particles before and after fluoride adsorption were studied by SEM, FTIR, EDX and XPS, which indicated that the adsorption mechanism may be related to electrostatic attraction and Lewis acid-base interaction.
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GREEN CHEMISTRY
·
2015
·Vol. 17
·期 5
·2888-2895
·
IF 8.02
Jian-hua Guo,Guang-yue Xu,Fei Shen,Yao Fu,Ying Zhang,Qing-xiang Guo
The long-chain alkanes obtained from the hydrodeoxygenation of plant oils are ideal substitutes for diesel. In this work, a new efficient catalytic system was established for the conversion of plant oil to long-chain alkanes under mild conditions with a bi-functional Ru/La(OH)3 catalyst. The hydrodeoxygenation of stearic acid was performed in an autoclave with Ru-based catalysts with different supports (HZSM-5, ZSM-5, SiO2–Al2O3, SiO2, ZrO2, Mg(OH)2, La(OH)3, and La2O3). Among these catalysts, Ru supported on basic La(OH)3 showed a remarkable catalytic performance for the reaction. Over 98% of long-chain alkanes were obtained with 100% conversion of stearic acid at 200 °C and 4 MPa H2. When crude Jatropha oil was hydrogenated, about 80.7 wt% of long chain alkanes were obtained under the optimized conditions (200 °C, 4 MPa H2, 8 h). The high efficiency of the Ru/La(OH)3 catalyst could be due to a co-effect of the high hydrogenation activity of Ru and the basic La(OH)3 support which can attract the acidic raw material. Additionally, the Ru/La(OH)3 catalyst was recycled four times and maintained a good activity and stability. The reaction pathway was also explored by using stearic acid as a model compound. Hydrogenation–decarbonylation could be the main pathway to produce n-heptadecane, which has one carbon atom less than stearic acid.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Xiaomei Jiang,Min Ma,Yujie Cui,Boyang Lu,Zhiguo Lin,Fengzhi Jiang
To enhance the phosphate removal performance, a porous material (La MOF-20 %-C) was prepared by selectively removing the thermally unstable NH 2 -BDC ligand from a lanthanum dual organic ligand MOF through pyrolysis. This innovative approach equips La-MOF-20 %-C with dual functionalities: high phosphate adsorption capacity and robust antibacterial effects. The adsorbent showcased a remarkable phosphate adsorption capacity of 97.24 mg P/g and reached equilibrium within 90 min. The material exhibits good anti-interference capability, and the presence of multiple coexisting ions does not affect its adsorption performance. Additionally, it can be used over a wide pH range (3.0–8.0) and has good reusability. Mechanistic studies indicated that electrostatic attraction and ligand exchange were the primary mechanisms for phosphate adsorption. Moreover, La MOF-20 %-C effectively inhibited the metabolic activities of Escherichia coli and Staphylococcus aureus through phosphorus starvation and electrostatic attraction, demonstrating significant antibacterial properties. Importantly, the fabrication of this material into a filter membrane enabled the successful treatment of 16.8 L of actual wastewater, achieving an overall phosphate removal rate of over 85 %, and effectively removing total bacteria. These findings highlight La MOF-20 %-C as a highly promising material with dual functionality for phosphate removal and bacterial inhibition.
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CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Tianyang Liu,Junli Wang,Xuanbing Wang,Jinlong Wei,Xiaoning Tong,Shengyou Su,Ju Zhang,Yuantao Yang,Ruidong Xu,Linjing Yang
The traditional Pb-Ag anodes used in zinc electrowinning exhibit high overpotential for oxygen evolution reaction (OER) and poor mechanical strength, leading to high energy consumption. To overcome the shortcomings, Ti/SnO 2 -Sb 2 O 4 /PbO 2 -La-doped MnCo 2 O 4.5 composite anode was prepared by this work. It demonstrated enhanced electrochemical performance, requiring 565 mV to reach the benchmark current density of 50 mA cm −2 , and the Tafel slop of 179.79 mV dec –1 in the acidic media containing 50 g L –1 Zn 2+ and 150 g L –1 H 2 SO 4 . According to the results of XPS, the content of Mn 4+ and Co 3+ increased, which was beneficial to promote the OER catalytic activity of the electrode. The current efficiency was improved by 1.7 % compared with traditional Pb-0.76 % Ag anode, resulting in a significant reduction in energy consumption of 477.46 kW∙h for producing one ton of zinc. Moreover, the Ti/SnO 2 -Sb 2 O 4 /PbO 2 -La-doped MnCo 2 O 4.5 anode showed excellent corrosion resistance, and the accelerated service time was extended to 50 h at 2 A cm −2 . The service life of the electrode was extended thanks to the introduction of the intermediate layer and La-doped MnCo 2 O 4.5 powder. Therefore, this work provided a novel strategy to prepare the anodes with enhanced electrochemical performance applied in zinc electrowinning and other aspects.
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Desalination and Water Treatment
·
2024
·
IF 1
Weikang Zheng,Boyan Wang,Zhenzhong Liu,Hongwei Yang,Zhanli Chen,Xiangrong Sun
Microplastics (MPs) in the aqueous environments has attracted widespread attention because of its potential risk to human health.Its high stability makes it difficult to be degraded and long term presence in the environment. Therefore, it is crucial to find an efficient and clean technology to remove microplastics in water. The advanced electrocatalysis oxidation process (AEOP) shows great potential for application. In this work, We focused on preparing Ti/Sb-SnO 2 electrodes doped with different rare earth elements (La, Ce, Sm or Nd) as active layer by sol-gel method. The electrooxidation system has efficiently degraded MPs in aqueous solution. The optimal parameters for the removal of MPs were electrode spacing of 1.5 cm, current density of 46.67 mA·cm −2 , Na 2 SO 4 electrolyte concentration of 0.22 mol·L −1 , and initial solution pH of 7. After 3 h, MPs removal rate by Ti/La-Sb-SnO 2 system reached 28.3 %, which was higher than the Ti/Ce-Sb-SnO 2 , Ti/Sm-Sb-SnO 2 , Ti/Nd-Sb-SnO 2 and Ti/Sb-SnO 2 electrode, the removal rates were increased by 8.23 %, 10.13 %, 16.28 % and 77 %, respectively. Electrochemical performance tests and •OH (Hydroxyl radicals) generation results indicated that the surface of Ti/La-Sb-SnO 2 electrode had abundant active sites, which promoted the formation of •OH to degrade microplastics effectively. In summary, the rare earth element-doped Ti/Sb-SnO 2 electrode provides crucial technological support for the electrooxidative removal of microplastics from water.
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International Journal of Electrochemical Science
·
2024
·
IF 1.3
Dandan Liang,Weili Hou,Ying Zhang,Jihua Shang,Haibo Ren,Yufeng Sun
Due to the prevailing energy shortages, the pursuit of new alternative energy sources is becoming increasingly urgent. Hydrogen production through water electrolysis has emerged as a crucial method. However, the sluggish four-electron reaction in the oxygen evolution reaction (OER) remains the primary rate-limiting step. In this study, we synthesized a heterostructure La(OH) 3 @CuO-P material on the nickel foam (NF) substrate. The experimental results demonstrate that after phosphating treatment, the heterostructure La(OH) 3 @CuO-P exhibits exceptional catalytic performance with only 215 mV overpotential, a Tafel slope value of 79.36 mV/dec, and a bilayer capacitance of 39.02 mF/cm 2 at a current density of 10 mA/cm 2 for OER in a 1 M KOH solution. These values are significantly superior compared to those obtained using heterostructure La(OH) 3 @CuO alone which showed an overpotential value of 365 mV at a current density of 10 mA/cm 2 . Moreover, during cyclic voltammetry testing for up to 500 cycles, La(OH) 3 @CuO-P also demonstrates relatively stable performance. Analyses suggest that composite heterostructure effectively addresses issues such as insufficient conductivity of La(OH) 3 and monomer aggregation tendency for CuO while maintaining excellent properties for each component. By incorporating P atoms as dopants, the interaction between La, Cu, and P atoms not only facilitates fine-tuning of the electronic structure and optimization of the adsorption free energy (-OH), but also promotes an increase in catalytic active sites through sample size reduction, thereby further augmenting the performance of the OER.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2025
·
IF 1.6
Ren Peng,Yang Yang,Liu Dai,Guan Cheng-peng,Huang Pin-wen,Qi Ming
A novel extraction process utilizing THEE-BisDGA ligand has been developed for the rapid and efficient recovery of trivalent lanthanide elements (La, Nd, Eu, and Dy) from uranium-containing acidic systems. The process rapidly achieves equilibrium within just 2 min and exhibits high distribution ratios. Notably, its extraction efficiency shows a positive correlation with the atomic number of the lanthanides. Significantly, the ligand demonstrates exceptional selectivity by excluding U(VI) extraction, thus enabling the targeted recovery of lanthanides. Back-extraction experiments confirm that 0.01 M HNO 3 can quantitatively strip lanthanides in three steps, highlighting its potential for industrial-scale separation and purification of valuable lanthanides. Moreover, density functional theory(DFT) calculations have confirmed that THEE-BisDGA exhibits superior selectivity for Ln(III) over U(VI), further reinforcing its effectiveness and applicability in advanced separation technologies.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Jiahao Cui,Xiaolong Gao,Kejing Pang,Wenbing Wu,Mrigendra Kumar Awasthi,Yihua Zhao,Xianqiang Yin
Current single-atom studies in the perdisulfate (PDS) system were focused on transition metals, but researching La-series metals might provide new insights for the efficient utilization of this system. The original structure’s Zn was evaporated at high temperatures, thereby we utilized Zeolitic Imidazolate Frameworks (ZIFs) as a substrate to synthesize a type of La-SACs catalysts. The La single atom in this work was identified to the La-N 4 configuration through La-L3 X-ray edge absorption spectroscopy. Experimental observations in suspension demonstrated that the PDS activation capability of La is on par with, if not superior to, that of transition metals such as Co and Cu. Tetracyclines (10 mg/L) were eliminated within 30 min via La-N-C + PDS systems and the pseudo-first-order was higher than 0.0929 min −1 . The Hydrogen bond between PDS and La-N-C and active electron of d orbital in La atoms had the significant influence on the generation of ROS ( 1 O 2 and •OH). Furthermore, the excellent electron transfer of La-N-C also promoted the activation rate of PDS. The findings of this study indicated that La could play a crucial part in PDS catalyst for degradation of organic pollutes in aquatic environment, providing the new method for exploration of single-atom materials in PDS systems.
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