TRANSITION METAL CHEMISTRY
·
2023
·Vol. 48
·期 2
·125-133
·
IF 1.7
Hu Yi,Xu Jingsong,Zhang Tianzhu,Zhong Hang,Chen Jun,Liu Xinai,Pan Qifa,Liu Ruidong,Jiang Chunli,Chen Jun
Electrocatalytic water splitting to produce hydrogen is a promising route to provide green hydrogen on a large scale. To explore non-noble metal electrocatalysts with high performance is still a challenge. Herein, a one-step electrodeposition way is developed to construct the heterostructural (NiO-La 2 O 3 )/(Ni-La)/NiO/Ni electrocatalysts on Ni foam. The dark Ni-La coating was prepared by co-electrodeposition from an aqueous solution containing LaCl 3 and NiCl 2 with a molar concentration ratio of 1:5. Among these heterostructural Ni-based electrocatalysts, an excellent HER activity is achieved: an overpotential of 22 mV at the current density of 10 mA cm −2 in 1 M KOH solution. It is demonstrated that the introduction of La significantly reduces the overpotential for HER. The higher the La content in the Ni-La coating of these electrocatalysts, the better the electrocatalytic HER performance was exhibited. This work provides a facile and inexpensive route to prepare Ni-La coating on electrodes in an aqueous solution.
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DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 36
·12808-12818
·
IF 4
Yanan Li,Jiqi Zheng,Jiaze Yan,Yanyan Liu,Ming Guo,Yifu Zhang,Changgong Meng
Diphenylamine (DPA) is a harmful pesticide widely used to control post-harvest scald of fruits. In this study, rapid and sensitive determination of DPA was realized by the development of an effective electrochemical sensor, which was fabricated by coupling La-doped NiWO4 nanoparticles (La/NiWO4) with reduced graphene oxide (rGO), and the obtained rGO/La/NiWO4 nanocomposite was modified on glassy carbon electrodes (GCEs). The morphologies, structures and compositions were well characterized, and the effects of La doping and the introduction of rGO on the crystal structure and electrochemical performance were discussed. The incorporation of both La and rGO was found to enhance the active surface area and improve conductivity, resulting in the enhanced electrocatalytic performance of rGO/La/NiWO4/GCE, including a wide linear range (0.01–500 μM), a low detection limit (0.0058 μM) and high sensitivity (1.778 μA μM−1 cm−2). The fabricated sensor was further used for DPA detection in fresh apple extract to evaluate its practicality and demonstrated excellent recoveries ranging from 99.52 to 104.70%.
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PubMed
高影响因子
APPLIED CLAY SCIENCE
·
2022
·
IF 5.907
Songhai Zheng,Jiajia Fan,Xiancai Lu
Eutrophication has long been a serious environmental problem in global water bodies, and phosphate has been considered as one of the key factors causing water eutrophication. Aiming to develop a low-cost and eco-friendly absorbent for phosphate removal , a type of heated kaolinite‑lanthanum hydroxide complex (HKL-LaOH) was prepared via an in-situ synthesis method . In the complex, a large number of nanoscale lanthanum hydroxide flakes were observed on the heated kaolinite surface. The HKL-LaOH with a relatively low lanthanum oxide content (4.42 wt%) exhibited a high phosphate adsorption capacity of 26.15 mg g −1 . Such a high utilization rate of lanthanum in HKL-LaOH was attributed to the unique two-dimensional flake shape of heated kaolinite, which achieved the effective dispersion of La(OH) 3 on the complex. Furthermore, a great quantity of LaPO 4 nanoparticles on the heated kaolinite surface of the HKL-LaOH complex were observed, which indicated chemical adsorption of phosphate followed by precipitation of LaPO 4 . In summary, the high dispersion of La(OH) 3 in HKL-LaOH and the resulted formation of LaPO 4 nanoparticles leads to high phosphate removal from eutrophic water bodies, which shows excellent application potential in the treatment of eutrophic water.
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CARBOHYDRATE POLYMERS
·
2022
·
IF 10.723
Liping Tan,Weihua Zhang,Xiaoguang Zhu,Yue Ru,Wenbo Yi,Bo Pang,Tongjun Liu
Lanthanum (La)-based nanoparticles (NPs) are promising candidates for phosphate removal owing to their inherently high affinity towards phosphate. However, significant challenges remain to be addressed before their practical deployment, especially the problems associated with their aggregation. Herein, we fabricated a high-efficient sorbent for phosphate removal through in-situ synthesizing La(OH) 3 NPs on a natural support, bacterial cellulose (BC), which is pre-modified with polyethyleneimine. The resultant La(OH) 3 NPs-immobilized BC with different La contents (BPLa-X) exhibited a highly fibrous porous structure, in which BPLa-3 was selected for further phosphate adsorption studies. BPLa-3 demonstrated a high adsorption capacity of 125.5 mg P g −1 , and high adsorption selectivity due to the large surface area and abundant exposed active adsorption sites for phosphate. Additionally, BPLa-3 also displayed high reusability and still possessed high adsorption capacity after four consecutive cycles of adsorption-desorption. Therefore, the present adsorbent is believed to be a promising candidate for practical phosphate removal.
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PubMed
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Yi Zhang,Donghao Liu,Weidong Guo,Yigang Ding
Two novel N -rich covalent organic frameworks (COFs), named COF-TZ-TP and COF-TA-TP, were prepared via a one-step solvothermal method and employed as the adsorbent to remove rare earth (RE) ions from solution. The as-prepared materials were characterized with XRD, FESEM, ATR-IR, BET, TGA and XPS analysis. The results show the rapid adsorption kinetics of La(III) with capacities of 165.6 and 89.8 mg/g for COF-TZ-TP and COF-TA-TP after 3 h. Moreover, Langmuir isotherm model and pseudo-second-order kinetic model are well fitted to describe the La(III) adsorption process. The analysis of the adsorption thermodynamic shows that the adsorption process is a spontaneous exothermic process with ΔS 0 of 57.22 and 84.09 J/(mol ∙ K) for COF-TZ-TP and COF-TA-TP, respectively. In addition, the fabricated COFs exhibit the better adsorption results towards the light RE ions compared with heavy ones and the excellent reusability after five adsorption-regeneration cycles. The adsorption mechanism reveals that the splendid adsorption performance of RE for our N -rich COFs is mainly attributed to the surface coordination interaction between the N element and La(III) according to the characterization analysis for COF-TZ-TP before and after the adsorption process with elemental mapping, EDS and XPS. Therefore, these COFs with abundant active N sites offer the highly efficient adsorption capacity of La(III), and provide the promising strategy for the recovery of light RE from waste rare earth devices.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2022
·
IF 3.656
Jincai Peng,Yuehong Peng,Tianhui Wang,Zhijie Wu,Qi Wang,Yongjin Li,Zhaoyi Yin,Jin Han,Jianbei Qiu,Zhengwen Yang,Zhiguo Song
In order to make the most of solar energy, the development of efficient UV–Vis–NIR activated photocatalysts has attracted more and more attention. In this study, the UV–Vis–NIR broad spectrum activated photocatalysts La-doped BaBiO 2 Cl with abundant oxygen vacancies (OVs) were successfully prepared by solid state reaction . The experimental results and theoretical calculations revealed that La doping induced OVs in BaBiO 2 Cl, formed an intermediate level, extended the light absorption to the NIR region, and promoted carrier separation efficiency. Owing to the synergistic promotion effect, the optimal BaBiO 2 Cl–3%La exhibited obviously enhanced photodegradation rate, which was about 3.26 times higher than that of pure BaBiO 2 Cl under UV–Vis–NIR light irradiation . This work provides a resultful strategy for designing new full-spectrum-activated photocatalysts for environmental protection.
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Processes
·
2022
·Vol. 10
·期 7
·1302
·
IF 3.352
Hailun Ren,Weihong Li
3-hydroxybutyraldehyde (3-HBA) is mainly employed to synthesize 1,3-BDO (1,3-butanediol), which is one of the most important components in cosmetics moisturizers. In this study, a series of composite oxide catalysts were prepared by bringing alkaline earth metal Ca and rare earth metal La to the composite oxide MgO/Al2O3, which were made through the co-precipitation method. These catalysts were applied in the synthesis of 3-HBA through acetaldehyde (AcH) condensation. The structure, texture, and acidic properties of these catalysts were characterized using various characterization methods, and the effects of catalyst composition, reaction temperature, reaction pressure, and residence time on the conversion of AcH were investigated as well. The results showed that the introduction of Ca and La weakened the acidic property and enhanced the basic property, which favored the AcH condensation to synthesize 3-HBA. At a temperature of 20 °C, pressure of 200 kPa, and residence time of 70 min, 0.5%La-2.3%Ca-2MgO/Al2O3exhibited a better catalytic activity, and the conversion of AcH reached 95.89%. The selectivity and yield of 3-HBA were 92.08% and 88.30%, respectively. The stability test indicated that the high AcH conversion could be maintained for 5 h.Keywords:composite oxides;acetaldehyde;condensation catalyst;3-hydroxybutyraldehyde
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Ning Liu,Dong Cao,Wenhao Liu,Huimin Zhang,Yinhai Zhu,Le Chang,Dengfeng Wu,Daojian Cheng
Constructing highly efficient and low cost electrocatalysts for oxygen evolution reaction (OER) is pivotal to various energy storage and conversion devices. In this work, five different rare earth (RE) metals doped (La, Ce, Pr, Nd, Er) Ag-nanoparticles-decorated α-Co(OH) 2 nanostructured electrocatalysts, which are grown on nickel foam (NF), are successfully prepared by a facile one-step hydrothermal approach. It is found that La-doped 2D ultrathin (∼2.0 nm) CoAg nanosheets arrays (denoted as La–CoAg/NF) can demonstrate the highest electrochemical activity towards OER in 1 M KOH solution among these RE-doped electrocatalysts. It delivers the lowest overpotential at 10 mA cm −2 (233 mV), the smallest Tafel slope (44.3 mV dec −1 ) and extraordinary stability for 35 h with no significant change during harsh OER process. The reasons for the enhanced performance may come from unique ultrathin 2D nanostructure and La-induced strong electronic interaction among Co, Ag, and La atoms. This work provides an essential insight to the development of RE-metal doped electrocatalysts for energy conversion.
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JOURNAL OF VINYL & ADDITIVE TECHNOLOGY
·
2022
·Vol. 28
·期 4
·719-725
·
IF 2.297
Deling Li,Congcong Luo,Bing Yao,Yue Ding,Jizhen Ren
Lanthanum complex with curcumin (La L 2 )/Ca-Zn composite stabilizer was prepared using La L 2 and Ca-Zn stabilizer, in which Ca-Zn stabilizer was obtained from calcium stearate and zinc stearate at their mass ratio of 5:1. The rheological properties and dynamic thermal stability of polyvinyl chloride (PVC) stabilized by La L 2 /Ca-Zn composite stabilizers were estimated through a torque rheometer. The degraded fragments obtained from the torque experiments were measured by Fourier-transform infrared spectroscopy (FTIR) and ultraviolet–visible (UV-vis) spectroscopy. La L 2 had an effective synergistic effect with Ca-Zn stabilizer. Compared with La L 2 , La L 2 /Ca-Zn composite stabilizer could more significantly improve the rheological properties and dynamic thermal stability of PVC. An optimal synergistic effect could be observed when the mass ratio of La L 2 with Ca-Zn stabilizer was about 8:2, in which the plasticizing torque and equilibrium torque of PVC was 33.3 N m and 22.5 N m, respectively, and its dynamic thermal stabilizing time was 25.1 min. The possible thermal stability mechanism of La L 2 /Ca-Zn composite stabilizer for PVC was suggested based on the evaluation of FTIR spectroscopy and UV-vis spectroscopy.
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Materials Advances
·
2022
·Vol. 3
·期 5
·2505-2514
·
IF 0
Wenzhu Yin,Dechun Xuan,Bihua Deng,Mingxu Zhou,Fang Ma,Jinqiu Zhang,Yu Lu
Adjuvants have proven to be integral components in most vaccines for promoting appropriate immune responses at both innate and adaptive levels. Imiquimod (IMQ, R837), an agonist for Toll-like receptors 7 (TLR7), is a potent molecular activator of the innate immune system and has been developed as an adjuvant for immunotherapy. However, due to its pharmacokinetic profile, IMQ may induce strong local and systemic inflammatory reactions and is poorly tolerated. To overcome these hurdles, herein, we conjugate IMQ and lauryl alcohol (LA) to the backbone of biodegradable poly (γ-glutamic acid) (γ-PGA) to prepare an amphiphilic polymer (shortened to γ-PGA-IMQ-LA) with improved stability and biodistribution of IMQ. In order to investigate the distribution of the amphiphilic polymer in vitro and in vivo, fluorescein was grafted to the lateral chain to synthesize fluorescent-labeled γ-PGA-IMQ-LA-FL (shortened to FIP). The novel amphiphilic FIP polymer was characterized via1H NMR, FI-IR, UV-vis, fluorescence spectra and zeta potential. Using ovalbumin (OVA) as a model antigen and FIP as an adjuvant for immunization, the formulations of FIP + OVA in different dosages could significantly promote the production of OVA-specific IgG in mice and prolong immune responses with acceptable safety.
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Progress in Natural Science-Materials International
·
2023
·
IF 4.7
Lin Zhang,Jun Chen,Lai-Bo Song,Jun-Jie Pan,Qing Luo
Developing effective and stable photocatalysts for organic pollutants degradation are still a big challenge in practical water treatment now. In this work, La doped ZnO–TiO 2 composite (La/ZnO–TiO 2 ) were successfully fabricated by using PVP modified ZIF-8/TiO 2 as template via the absorption and pyrolysis routes. All as-fabricated materials were analyzed by XRD , SEM, TEM , BET, XPS , UV–vis absorption spectra and ESR spectra. PVP modified ZIF-8/TiO 2 was fully transferred into ZnO–TiO 2 after being pyrolyzed at high temperature under air atmosphere. The doping of La can make ZnO–TiO 2 exhibiting red-shifted, which is attributed to the capture of photo-generated electrons by La, leading to the effective separation between photo-generated electrons and holes. Furthermore, the photocatalytic performance of all as-fabricated materials were explored by degradation of tetracycline (TC) solution under UV light irradiation. La/ZnO–TiO 2 exhibits excellent stability. And the photocatalytic degradation rate of La/ZnO–TiO 2 is 99.2%, which is even higher than ZnO (87.4%), ZnO–TiO 2 (87.4%), P25 (TiO 2 ) (92.7%). More than that, the effect of catalyst's dose, effect of TC concentration and effect of pH for TC degradation have been well explored. The excellent photocatalytic performance of La/ZnO–TiO 2 makes it possible to be applied for degradation of organic pollutants in practice.
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CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Yu Zeng,Chenhan Xiong,Jingxuan Li,Zhiyong Huang,Guoping Du,Zhaoyang Fan,Nan Chen
Ceramic/polymer composites have great potential to achieve the concomitant enhancement of both dielectric constant and breakdown field while maintaining other superior properties of the polymer matrix , ideal for elastomer sensors, actuators, capacitive energy storage, and many other applications. However, material incompatibility between the ceramic filler and the polymer matrix often leads to void formation , particle aggregation and phase separation, with significantly degraded performance. Herein, through surface modification, co-doped TiO 2 particles were uniformly dispersed and bridged onto the silicone rubber matrix via a silane coupling agent for fabricating composites via mechanical mixing and hot-pressing. The synthesized composites exhibit enhanced dielectric constant, increased from 2.78 to 5.06 when 50 wt% co-doped TiO 2 particles are incorporated. Their dielectric loss is less than 0.001 in a broad frequency range. Theoretical modelling and experimental results reveal that the morphology and dispersion state of co-doped TiO 2 particles were crucial to the dielectric properties of the silicone rubber-based composites. Besides, the composites are thermally stable up to 400 °C. Significantly increased tensile strength (612 kPa) and elongation at break (330%) were obtained for the composite incorporated with 30 wt% co-doped TiO 2 particles, accompanied by a moderate increased elastic module (540 kPa). Such composites have the potential for different applications.
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