SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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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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Materials Today Communications
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2024
·
IF 3.7
Renzhong Xue,Xiaosong Liu,Kun Yang,Xiang Zhu,Tao Li,Haiyang Dai,Jing Chen
(Bi 1-x La x ) 2/3 Cu 3 Ti 4 O 12 ceramics were prepared via solid-state method. Their phase composition, microstructure and defect formation along with optical, dielectric, and nonlinear properties were systematically studied. Results showed that La 3+ doping reduced cation vacancies and enhanced optical band gap. The increased grain size, density, grain boundary (GB) resistance, and barrier height improved the dielectric and nonlinear properties of the doped samples. (Bi 0.95 La 0.05 ) 2/3 Cu 3 Ti 4 O 12 ceramic exhibited the highest dielectric constant of ∼25295 and low dielectric loss tangent of ∼0.062 at 10 kHz, as well as nonlinear coefficient of ∼3.21 and breakdown strength of ∼2.47 kV/cm. Huge dielectric constant in low-frequency range was associated with the presence of semiconducting grains and insulating GBs, following the internal barrier layer capacitance mechanism. Nonlinear properties originated from Schottky barriers at GBs. In addition, dielectric relaxations of all the samples were ascribed to Maxwell–Wagner relaxation related to GBs as well.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Yubing Zheng,Furong Chen,Yidan Liu,Huan Song,Baojuan Kang,Xiaoxuan Ma,Zhenjie Feng,Lei Huang,Shixun Cao,Rongrong Jia
Transition metal oxides have gained significant recognition for their remarkable catalytic performance in the oxygen evolution reaction (OER). Among this group, the perovskite-structured AB O 3 compounds have emerged as prospective OER electrocatalysts , particularly when selections are made for the constituents occupying the A and B sites. Here, we employed a simple solid-state reaction method to synthesize perovskite-structured R FeO 3 ( R = Tm, La) and subsequently loaded them on high-conductive nickel foam (NF) for OER. The results reveal that R FeO 3 /NF ( R = Tm, La) catalysts exhibit low overpotentials of 361 mV and 357 mV, respectively, for OER at a current density of 10 mA·cm −2 , indicating substantial advancements in both catalytic activity and efficiency.
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CATALYSIS LETTERS
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2024
·
IF 2.3
Sun Xiaoqin,Zhang Zehua,Yun Sining
Plasmonic-driven photocatalyst have outstanding solar driven surface plasmon resonance (SPR) characteristics, and it is a prospective approach to improve photocatalytic performance. Herein, plasmonic Co metal decorated SrTiO 3 : La/Cr hollow cubes was developed and constructed by template-free hydrothermal method. The photocatalyst possesses the merits of the hollow structure with large specific surface area and strong light absorption. The intimate contact between Co and SrTiO 3 : La/Cr promotes the interfacial charge transfer. Co-SrTiO 3 : La/Cr manifests the superior photocatalytic performance toward water splitting for hydrogen evolution compared with that of other cocatalyst. And the H 2 evolution exceeds 210 μmol·g −1 ·h −1 under the optimum of the amount of 1.25wt% Co NPs. The mechanism of the enhanced performance comes from the improvement of light absorption in the visible-light region induced by SPR, as well as the efficient interfacial separation and transport of charge carriers on the photocatalyst facilitated by the local electromagnetic fields of plasmonic Co metal. Graphical Abstract
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CATALYSIS TODAY
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2024
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IF 5.2
Yanan Jiang,Huayu Sun,Yuzhen Fang,Cuijuan Zhang,Yuan Liu
The sintering issue of Ni nanoparticles seriously limits the practical application of the Ni-based catalysts for CO 2 methanation. This work demonstrates that the La- and Ce- dual-promoted Ni/ZrO 2 shows better durability at 600 ºC and 60000 mL g cat −1 h −1 over 200 h compared with the La- or Ce- single-promoted. The composition and microstructure characterization indicates that the dispersion and sintering resistance of Ni nanoparticles is enhanced with the dual-promoted catalysts. Both depth profile of X-ray photoelectron spectroscopy and density functional theory calculation show that in the La- and Ce- dual-promoted Ni/ZrO 2 , the reduced dissolution of Ce into ZrO 2 lattice and the spread of La on ZrO 2 surface by forming a La 2 O 3 -CeO 2 solid solution improves the dispersion and stability of Ni nanoparticles. This work provides a facile strategy to mitigate the sintering of Ni nanoparticles and thus improve the stability of Ni-based catalysts for CO 2 methanation.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2024
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IF 8
Qinqin He,Hongjun Zhao,Zedong Teng,Yali Guo,Xiaonan Ji,Wei Hu,Min Li
The selection of different organic ligands when synthesizing metal organic framework (MOFs) can change their effects on the adsorption performance. Here, four La-MOFs adsorbents (La-SA, La-FA, La-TA and La-OA) with different organic ligands and structures were synthesized by solvothermal method for phosphate adsorption, and the relationship between their adsorption properties and structures was established. Among four La-MOFs, their phosphate adsorption capacities and adsorption rates followed La-SA > La-FA > La-TA > La-OA. The results indicated that average pore diameter played a key role in phosphate adsorption and there was a positive correlation between average pore diameter and adsorption capacity ( R 2 = 0.86). Coexisting ion experiments showed that phosphate adsorptions on three La-MOFs (La-SA, La-FA and La-TA) were inhibited in the presence of CO 3 2− and HCO 3 − . The inhibition of CO 3 2− was the most pronounced and the results of redundancy analysis pointed out that it was mainly due to the change of pH value. In contrast, La-OA showed enhanced phosphate adsorption in the presence of CO 3 2− and HCO 3 − , and the combination of pH experiments showed that phosphate adsorption by La-OA was increased under alkaline conditions. Further combined with FT-IR, XRD , high resolution energy spectra of XPS (La 3d, P 2p and O 1s) and XANES , the adsorption mechanisms were derived electrostatic attraction , chemical precipitation and inner sphere complexation, and the last two were identified as the main mechanisms. Moreover, it can be identified from XPS 2p that the phosphate adsorption on La-FA and La-OA were mainly in the LaPO 4 state, while La-SA and La-TA mainly existed in the form of LaPO 4 ·xH 2 O crystals and inner sphere complexes. From the perspective of material morphology, this work provides a thought for the rational design of MOFs with adjustable properties for phosphate adsorption.
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PubMed
高影响因子
ChemistrySelect
·
2025
·Vol. 10
·期 29
·e02906
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IF 2
Haojun Zhang,Gengrui Zhao,Shaoting Ma,Bin Zhang
Graphical A novel method enhances triboelectric nanogenerator (TENG) output by using La-doped bismuth ferrite nanoparticles as the triboelectric layer filler. Under the filler concentration threshold, the output performance of the TENG with 1.5 wt% La-doped BFO fillers is significantly enhanced compared to that with undoped BFO fillers. Additionally, a self-powered anticorrosion system is developed using this TENG as the energy source. Incorporating high-permittivity nanoparticles as fillers into triboelectric layers is an effective strategy to enhance the output performance of triboelectric nanogenerators (TENG). However, exceeding the critical filler concentration threshold causes nanoparticle aggregation, limiting further output performance enhancement of TENG. Here, a novel approach is proposed to enhance TENG output performance by doping lanthanum (La) into bismuth ferrite (BFO), forming La-doped BFO nanoparticle fillers (BLFO) to further improve the output performance of polyvinylidene fluoride (PVDF)-based TENG without increasing filler concentration. This approach overcomes the limitation of nanoparticle aggregation at high filler loadings while significantly enhancing the output performance of TENG. Below the critical concentration threshold, the dielectric constant of BLFO/PVDF composites increases by 32% compared to undoped BFO/PVDF composites. Consequently, the BLFO/PVDF-based TENG achieves a high output voltage of 329 V and short circuit current of 44 µA, representing 43% and 69% increases over the BFO/PVDF-based TENG, respectively. Notably, these values represent 219% and 193% increases compared to the pure PVDF-based TENG. Furthermore, a self-powered anticorrosion system powered by the BLFO/PVDF TENG demonstrates effective metal protection, as evidenced by open-circuit potential measurements and reduced average corrosion rates.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2021
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IF 3.171
Qing Shu,Xinyuan Liu,Yanting Huo,Yuhui Tan,Caixia Zhang,Laixi Zou
A novel solid Brönsted-Lewis acid catalyst La-PW-SiO 2 /SWCNTs (single-wall carbon nanotubes) was synthesized from the synergistic modification of H 3 PW 12 O 40 (HPW) by single-walled carbon nanotubes functionalized with sidewall hydroxyl groups (SWCNTs–OH) and La 3+ via sol–gel method. The freshly prepared catalyst was characterized by several methods, and the catalytic activity and stability of it were studied from the esterification of oleic acid and methanol. Results showed that the highest conversion of oleic acid was 93.1% (mass) and maintained as high as 88.7% (mass) after six cycles of La-PW-SiO 2 /SWCNTs. The high catalytic activity and stability of La-PW-SiO 2 /SWCNTs can be attributed to the strong electron withdrawing effect of La 3+ on π bond of SWCNTs , because it can facilitate the formation of a large number of strong Lewis acid sites. Therefore, the reduction of catalytic activity of a solid acid catalyst due to the fact that hydration reaction of its Brönsted acid sites can be effectively reduced. La-PW-SiO 2 /SWCNTs can be an efficient and economical catalyst, because it shows good catalytic activity and stability.
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CHEMICAL ENGINEERING JOURNAL
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2025
·
IF 13.2
Haotian Hao,Yao Zhang,Shuo Xu,Zihao Wang,Yili Wang,Shan Wang,Baoyou Shi
Enriching low-concentration phosphorus in water is prerequisite for phosphorus recovery. In this study, a polyvinyl alcohol (PVA)-assisted high-temperature stabilization method was developed to synthesize a magnetically recoverable La(OH) 3 -Fe 2 O 3 composite, designated as PMLH, via stable crosslinking. Compared with MLH-1, a conventionally synthesized La(OH) 3 /Fe 2 O 3 composite, PMLH-1 (La/Fe molar ratio = 1:1) exhibited 31.77 % more La(OH) 3 adsorption sites and maintained 2.32 times higher phosphate adsorption capacity after 10 reuse cycles. The optimal synthesis conditions were determined as calcination temperature of 150 °C, PVA dosage of 0.375 %, and La-to-Fe molar ratio of 1.5. Structural characterization revealed that PMLH-1.5 consisted of rod-like La(OH) 3 and irregular γ-Fe 2 O 3 tightly bonded via PVA bridging. The composite demonstrated a maximum phosphate adsorption capacity of 79.51 mg P/g, reaching equilibrium within 16 h at 0.5 g/L dosage. The saturated adsorption remained stable across pH 3–9. While coexisting NO 3 − and humic acid showed negligible effects, Mg 2+ , Cl − , SO 4 2− and HCO 3 − reduced adsorption by 10–20 %, whereas Ca 2+ significantly enhanced phosphate uptake. Notably, PMLH-1.5 exhibited exceptional practical performance, exceeding its theoretical saturation capacity by 20 % with prolonged adsorption in real water matrices. Efficient desorption (4 h) was achieved using 2.5 M NaOH/1.875 M NaCl mixed solution. The PMLH-1.5 demonstrated remarkable stability across 40 consecutive adsorption-desorption cycles using actual water samples, consistently meeting discharge standards for 13–14 full cycles. This performance established a new reference point for cyclic durability assessments in water treatment research. Sequential desorption in the same desorbent progressively concentrated phosphorus from 0 to 26.69 mg/L, enabling effective low-concentration phosphate enrichment. Economic analysis confirmed that PMLH-1.5 exhibits a competitive chemical cost, ranging from 3.28 to 5.26 CNY/mol P (0.46 to 0.74 US $/mol P).
研究领域:
环境科学
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材料科学
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水处理技术
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可持续资源回收
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Materials Testing
·
2017
·Vol. 59
·期 10
·885-889
·
IF 0.418
Wencai Xu,Qi Li,Zhifu Yin,Xing Wang,Helin Zou
Lanthanum (La)-modified lead zirconate titanate (PLZT) thin films with doping concentration from 0 to 5 at.-% have been fabricated by sol-gel methods to investigate the effects of La doping on crystalline orientation, microstructure and dielectric properties of the modified films. The characterization of PLZT thin films were performed by X-ray diffractometry (XRD), scanning electron microscopy (SEM) and precision impedance analysis. XRD analysis showed that PLZT films with La doping concentration below 4 at.-% exhibited (100) preferred orientation. SEM results indicated that PLZT films presented dense and columnar microstructures when La doping concentration was less than 3 at.-%, while the others showed columnar microstructures only at the bottom of the cross section. The maximum dielectric constant (1502.59 at 100 Hz) was obtained in a 2 at.-% La-doped film, which increased by 53.9 % compared with undoped film. Without introducing a seed layer, (100) oriented PLZT thin films were prepared by using conventional heat treatment process and adjusting La doping concentration.
研究领域:
材料科学
·
电子工程
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NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 22
·18318-18327
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IF 3.201
Na An,Ying Wang,Meng Li,Huiming Lin,Fengyu Qu
Recently, with strong NIR absorption, CuSx nanomaterials have been considered as potential photothermal and photodynamic anticancer agents. Herein, Cu9S5 nanoparticles were synthesized as the core and coated with mesoporous silica to construct the core–shell nanostructure (Cu9S5@mSiO2). The as-synthesized Cu9S5@mSiO2 nanomaterial possesses uniform sphere morphology, about 50 nm in size. Considering its ample porous structure, Cu9S5@mSiO2–NH2 was used as a nanocarrier to demonstrate the high loading efficiency of the photosensitizer indocyanine green (ICG). Under 808 nm NIR light illumination, the temperature rises to 55.8 °C (3 W cm−2), and the high photo-thermal converter is ascribed the combined action of Cu9S5 and ICG. Moreover, Cu9S5@mSiO2–ICG also reveals the illumination-dependent ROS generation. In addition, polyethylene glycol (PEG) and lactose acid (PEG–LA) was prepared and grafted outside Cu9S5@mSiO2–ICG to further guarantee the targeting and cell uptake performance. Under the synergistic effect of PTT and PDT, the Cu9S5@mSiO2–ICG@PEG–LA nanocomposite shows enhanced cytotoxicity to human hepatoma cells (HepG2), making it a promising candidate in nanomedicine as an antitumor agent.
研究领域:
肿瘤学
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材料科学
·
纳米医学
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JOURNAL OF CATALYSIS
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2018
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IF 6.759
Ziang Zhao,Wei Lu,Hejun Zhu,Wenda Dong,Yuan Lyu,Tao Liu,Xingkun Chen,Yuqing Wang,Yunjie Ding
Selective synthesis of mixed alcohols from syngas (CO + H 2 ) via Fischer–Tropsch synthesis (FTS) is an alternative one-step one-pot method. Here we report a series of Co-based catalysts supported by activated carbon (AC) and promoted by Mn and La, namely, Co x Mn y La/AC, over which the selectivity to alcohols is usually ∼26.8% and up to 31.7% at elevated reaction pressure, accompanied by a large amount of olefin byproducts (∼30%) that can be further converted to alcohols via a hydroformylation process. Detailed characterizations are performed for the structural properties of catalysts, including physisorption, chemisorption, microscopy, crystal structure, and surface element compositions. The active site of Co x Mn y La/AC catalysts is the highly dispersed metallic Co on the surface of Co 2 C nanoparticles (Co@Co 2 C), similar to that of Co x Mn/AC catalysts reported previously, while that of Co y La/AC catalysts is a combination of metallic Co and Co 2 C phases (Co–Co 2 C). The result indicates that Mn promoter plays a determinative role in the formation of active sites over Co x Mn y La/AC catalysts. Nevertheless, the La promoter tends to aggregate on the surface of cobalt nanoparticles in the form of La 2 O 3 to promote the CO insertion step and enhance the H 2 chemisorption, so that it can both facilitate the formation of alcohols and make the FTS product class shift to light components. The result proves that the structure of active sites can be established by adding a strong promoter such as Mn, and a second promoter, such as La, can be used to tune the FTS reaction toward alcohols by further modifying its surface properties.
研究领域:
催化化学
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材料科学
·
能源化学
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