ENVIRONMENTAL POLLUTION
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2023
·
IF 8.9
Changjin Liang,Honghai Wu,Yufeng Guan
Ferrihydrite (Fh) is a vital geosorbent in the natural environment. Here, Fh materials with lanthanum (La) substituted in varied La/La + Fe ratios were synthesized, and these La-Fh materials were investigated in-depth via adsorption kinetic and isothermal experiments to explore their adsorption performance for chromate [Cr(VI)] in soils. Material properties of La-Fh were further characterized with X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectrometer (FTIR), and X-ray photoelectron spectroscopy (XPS). The results clearly indicate that La 3+ can be integrated into the Fh lattice, but the increase in La amount substituted into Fh is slowed down when the La/La + Fe ratio reaches to a larger value. Those La 3+ cations that fail to become integrated may either get adsorbed or form a phase of La(OH) 3 on La-Fh surfaces. We also find that La substitution reduces the specific surface area (SSA) of La-Fh samples but raises their pH pzc , which hampers La-Fh conversion to hematite and thus increases the chemical stability. These changes are related to the La-Fh structure and surface aspects, but they do not negatively affect the Cr(VI) adsorption efficacy, which can be promoted over a wide pH range to an alkaline pH. For instance, the maximum adsorption amount of Cr(VI) by 20%La-Fh is 30.2 mg/g at a near-neutral pH. However, the entire chromate adsorption processes are affected by H 2 PO 4 − and humic acid due to their strong affinities for Cr(VI), but almost not influenced by NO 3 − and Cl − . All the Cr(VI)-Fh reactions are well described by the fitted adsorption Freundlich model and conform to the pseudo-second-order reaction kinetic equation . The mechanisms which enhance La-Fh's adsorption ability for Cr(VI) are governed by chemical interactions, because La substitution can increase the hydroxyl density on Fh surfaces and thus improve the reactivity of La-Fh towards Cr(VI), leading to an evidently enhanced Cr(VI) immobilization onto La-Fh.
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Journal of Materials Research and Technology-JMR&T
·
2023
·
IF 6.4
Qiaoyun Liu,Yifeng Yu,Changjiang Liu,Yuhang Liu,Liangjie Yuan,Zheng Wang,Aixi Yu
Lanthanum (La) compounds have attracted much attention because of low toxicity and biocompatibility. In this study, a series of La-doped magnesium phosphate composites bone repair materials (LMPCs) were prepared by the precursor method, in which the molar ratio of lanthanum was 1%, 3% and 5%, respectively. The results of X-ray powder diffraction, scanning electron microscope and compressive strength test show that La-doped magnesium phosphates (LMPs) synthesized by the precursor method have uniform particle distribution, high purity and excellent degradability. In vitro research results show that LMPCs exhibited reliable biosafety and excellent bioactivity. The introduction of lanthanum enhances the antibacterial activity of Escherichia coli and Staphylococcus aureus of the composite. Furthermore, the combined system of released La 3+ and Mg 2+ is more conducive to promoting the proliferation of mesenchymal stromal cells (MSC) and angiogenesis of human umbilical vein endothelial cells (HUVECs) when the content of lanthanum is 3% (referred to as LMPC-2). By up-regulating the expression of alkaline phosphatase (ALP) and Runt-related transcription factor 2 (RUNX2), LMPC-2 is prominent in promoting osteogenic differentiation, and mineralized calcium deposition in vitro . Moreover, the results of micro-CT, H&E and Masson staining confirmed the beneficial effect of the combined system of La 3+ and Mg 2+ on the repair of rat skull defects in vivo . These achievements will provide new strategies for improving the biological activity of LMPCs and provide reference value for bone repairing in the clinic.
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Sen Peng,Lei Xiao,Lianwen Deng,Jun He,Yecheng Xi,Jiahui Zhu
In this work, two novel CaASbWO 8 (A = Gd, La; named CGSWO and CLSWO) microwave dielectric ceramics were synthesized by a classical solid-state method. Remarkably, the outstanding microwave dielectric properties ( ε r = 12.97, Q×f = 45,034 GHz, and τ f = −16.29 ppm/°C) were achieved for CGSWO ceramics sintered at 1440 °C, and CLSWO ceramics sintered at 1300 °C possessed the excellent microwave dielectric properties of ε r = 9.89, Q×f = 61,326 GHz, and τ f = 0.55 ppm/°C. Bond valence, ionic polarizability, Raman spectroscopy and Phillips–Vechten–Levine (P-V-L) theory were used to study the internal lattice vibration and chemical bonds in detail, and the dielectric properties were explored from the internal factors. In comparison to the ε r , the ε theo of CGSWO was found to be consistently underestimated, whereas CLSWO exhibited a contrasting pattern. This discrepancy was primarily attributed to the rattling and compressed effects of A-site cation. According to the analysis of P-V-L theory, W-O bond played an important role in regulating the Q×f value. Moreover, the τ f values of CGSWO and CLSWO ceramics were opposite, which provided an opportunity to manufacture microwave ceramic devices with good temperature stability.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 27
·期 32
·40346-40354
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IF 3.056
Liao Taiwan,Huang Pengwei,Song Huiyu,Guo Jia,Fu Xionghui,Yu Xiang,Peng Liang,Han Boping,Zhu Yi,Zhang Yuanming
In this study, La(OH) 3 -modified magnetic sodium carboxymethyl cellulose (La-MC) was prepared as adsorbents for phosphate, which exhibited excellent adsorption performance up to 62.98 mg P/g and magnetic property for easy recovery. The recovered adsorbents after phosphate sorption were subsequently used for photocatalytic reduction of Cr(VI) and possessed good photocatalytic activity. This work provided an excellent reference for developing a new way of extending life cycle of adsorbents by combining phosphate adsorption with photocatalysis for sequential removal of pollutants from water in the future.
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CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Lingchao Kong,Yu Tian,Zheng Pang,Xiaohong Huang,Ming Li,Ning Li,Jun Zhang,Wei Zuo,Junjing Li
Phosphate and fluoride are primary culprits of water eutrophication and skeleton fluorosis, respectively, severely threatening the security of aquatic lives and public health. To deal with the aqueous phosphate and fluoride pollution, PC@La nanocomposites were tailor-designed based on low-cost periclase and lanthanum salt via a facile urea hydrothermal method. Results from SEM, XRD, FTIR, XPS analysis revealed the PC@La-1.0 was constructed by Mg-La bimetal carbonated hydroxides with the three-dimensional needle-like nanostructure. Highly effective adsorption capacities for both phosphate (107.34 mg/g) and fluoride (63.11 mg/g) were achieved by PC@La-1.0. The adsorption was pH-dependent, and the optimal pH values for adsorption was 4.0–6.0. Over 80% of initial adsorption capacities remained after four adsorption–desorption cycles, indicating its satisfactory reusability. Superior adsorption selectivity for phosphate and fluoride was proven when co-existing with common ions and organics in solutions and real sewage. Mechanism analysis revealed that the unique structure of Mg-La bimetal carbonate hydroxide structure of PC@La-1.0 promoted an accumulative anion adsorption performance. Mg and La cations on PC@La-1.0 formed strong inner-sphere complexation with target phosphate and fluoride while the internal carbonate and hydroxyl groups contributed to adsorption via ion exchange. This study highlights the novel low-cost method to prepare promising candidates for efficient dephosphorization and defluorination from water.
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RSC Advances
·
2016
·Vol. 6
·期 34
·28331-28342
·
IF 3.289
Lu Wang,Xi Xie,Di Liu,Xiao-Bin Fang,Peng Li,Jian-Bo Wan,Cheng-Wei He,Mei-Wan Chen
Reduction-sensitive micelles with crosslinked cores were developed to load the lipophilic chemotherapeutic drug docetaxel (DTX) in order to overcome the issues of toxicity, water insolubility, and rapid metabolism of DTX. These DTX-loaded micelles (MM(DTX/Crosslink)) provide efficient incorporation and sustained release of DTX. Using independently synthesized LA–PLGA–TPGS and DSPE–PEG polymers as vehicles, MM(DTX/Crosslink) was found to be reduction-responsive, and possessed desirable drug entrapment efficiency (84.17 ± 1.15%) and drug loading efficiency (6.21 ± 0.07%). The MM(DTX/Crosslink) quickly dissociated under reduction conditions that mimicked the reductive intracellular environment, suggesting that it can rapidly release the encapsulated DTX in vitro. Furthermore, to target MM(DTX/Crosslink) to tumors for cancer therapy, iRGD was conjugated to the surface of MM(DTX/Crosslink). The iRGD-MM(DTX/Crosslink) micelles significantly increased the cellular uptake of DTX and inhibited cell proliferation, compared to the micelles without iRGD modification. Moreover, the iRGD-MM(DTX/Crosslink) micelles presented enhanced antitumor effects based on the analyses of apoptosis and cell cycle arrest. The micelles developed in this work may constitute a stable, efficient, and powerful system to deliver DTX into cancer cells.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xin Ke,HuiPing Shao,HaiHong Liu,Wengang Liu
In this study, an Fe-La-CS adsorbent with a reticulated structure was prepared by an in situ method, which was able to adsorb arsenate efficiently over a wide pH range of 3–11. The incorporation of iron and lanthanum ions broadened the tolerant pH range of the adsorbent compared with chitosan beads (CS). Arsenic was mainly present in the pH range of 3–9 as two forms, H 2 AsO 4 − and HAsO 4 2− . Calculations using the density-functional theory (DFT) showed that in the Ligand interactions and electrostatic interactions dominate in the pH range, with surface precipitation, and hydrogen bonding interactions playing a facilitating role. The background ions mainly compete with arsenic adsorption for electrostatic interaction sites. However, due to the different valence states of the background ions, the competition intensity is different. Such as low valence state representative ions Na + , K + competitiveness is weak, and arsenic competition adsorption first occupy different adsorption sites, therefore, from the quantum chemistry and molecular dynamics point of view of Na + , K + on arsenic adsorption almost no effect. Cl − , SO4 2− will have some influence on arsenic adsorption because of the same charge with arsenic, but the charged amount is smaller than arsenic and the molecular structure is different from that of arsenic, so the influence is not very big. In summary, the material design of Fe-La-CS adsorbent has great potential and theoretical significance for selective purification of heavy metal wastewater at wide pH.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Dongze Ren,Mingjie Liu,Min Cao,Shan Wang,Sixing Fan,Mozhen Liu,Jianbin Zhang,Huijun Sun
Osteoarthritis (OA) is an irreversible degenerative disease of articular cartilage that commonly occurs in the middle-aged and elderly people. However, effective intervention for early and middle-stage OA is still limited due to its complex and multifactorial nature. Excessive reactive oxygen species (ROS) and the inflammatory microenvironment are considered to play crucial roles in the occurrence and development of OA. Here, a novel HPB@LA@PDA nanoplatform is designed, which utilizes the mimicking enzyme activity of hollow prussian blue (HPB) nanozymes and antioxidant activity of lipoic acid (LA), to synergistically scavenge ROS and remodel the OA microenvironment. HPB@LA@PDA was firstly synthesized and the characterizations were confirmed by TEM, DLS, XPS, FTIR, UV–Vis, and XRD methods. It exhibited excellent multienzyme-like (SOD, GPx, CAT and POD-like) activities and antioxidant activities, converting •O 2 − , H 2 O 2 , •OH and reactive nitrogen species into harmless products. Importantly, at both the cellular and animal levels, we found HPB@LA@PDA could effectively scavenge excess ROS, protect against ROS-induced oxidative stress, apoptosis and ferroptosis, and ameliorate mitochondrial dysfunction, reduce inflammatory expression, and inhibit macrophage polarization in the chondrocytes. Finally, the results of in vivo study demonstrated that HPB@LA@PDA exhibited good biocompatibility and excellent therapeutic efficacy in the OA rat model. Micro-CT scaning, histopathological and immunofluorescence staining and western blotting analysis confirmed that HPB@LA@PDA attenuated the progression of OA by way of scavenging reactive oxygen species and remodelling the inflammatory microenvironment. The combination of drug and nanoenzyme vehicle offers a promising prospect for the treatment of various inflammatory diseases, including OA.
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Journal of Water Process Engineering
·
2024
·
IF 6.3
Yue Zhou,Fangbin Lin,XiaoDong Wang,Hui Wang,Bingchun Xue
The development of adsorbents with high adsorption capacity and wide adaptable pH range was crucial to effectively controlling of water environment pollution. In this study, three-dimensional porous chitosan gel microspheres loaded with Ni and La (Ni-La-CS) were prepared for the adsorption of excessive phosphorus. The performance was investigated using glyphosate isopropylamine salt (GIS) and KH 2 PO 4 , which were selected as representative substances for organic and inorganic phosphorus. Results showed that Ni-La-CS exhibited high phosphorus removal efficiency with wide adaptable pH range. The adsorption process was monomolecular layer chemisorption , and the adsorption was spontaneous and endothermic. The coexistence of F − promoted the adsorption of phosphorus, while Cl − , SO 4 2− , CO 3 2− and HCO 3 − inhibited the adsorption. The material retained stability even after 5 cycles and the actual phosphorus-containing wastewater with 3.13 mg·L −1 could be treated to meet Chinese first-class standard.
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APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Tianyun Zhao,Qiuwan Shen,Martin Andersson,Shian Li,Jinliang Yuan
High-entropy perovskite catalyst was synthesized and utilized for the first time in the MSR catalytic reaction. Among the HEPs, La(CoCuFeAlCe) 0.2 O 3 exhibited excellent MSR activity and high selectivity. The mechanism of the MSR reaction on the catalyst (100) surface was studied by employing DFT. The results indicate that the surface of La(CoCuFeAlCe) 0.2 O 3 catalyst has the lowest energy barrier, where the aldehyde hydrogenation reaction is the rate-determining step, explaining its high activity and selectivity. This research contributes additional evidence for the creation of high-entropy perovskite catalysts for MSR.
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Constantin Muhire,Behery Realy,Xiyan Xu,Dagang Li,Niu Zhang,Dongxiang Zhang
In this work, a novel inorganic-organic Bi/La-C-oxide material for iodine vapor capture in conditions of high temperature, mostly encountered during the reprocessing of the spent nuclear fuel, was synthesized. Bi/La-C-oxide (Bi/La=1, 300 °C) was synthesized using a new approach that allowed the non-decarbonization of used fuels, which instead made a framework with the core of Bi/La oxide to form a hybrid material, which exhibited a fast iodine uptake with a capacity of 1339.64 mg·g −1 at 18 h and 1301.47 mg·g −1 after 26 h at 200 °C, respectively. Notably, Bi/La-C-oxide (Bi/La=1, 300 °C) owed the high iodine-adsorbing ability mainly from its structure made of tetragonal units of Bi 1.92 La 0.08 O 3 linked together with esters to form a polyesterified Bi/La-C-oxide framework. The thermal stability analysis of the materials before and after iodine capture showed high thermal stabilities, proving their ability to withstand real-field high-temperature conditions. ZnO was used to consolidate the iodine wastes to avoid post-sorption secondary pollution, and the iodine leaching rate was minimized to 1.143 × 10 −3 g·(m 2 ·day) −1 after 7 days of product consistency test-A.
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COLLOIDS AND SURFACES B-BIOINTERFACES
·
2012
·
IF 3.456
Yu Zhang,Ruo Yuan,Yaqin Chai,Xia Zhong,Huaan Zhong
A novel material, sol–gel derived La(OH) 3 nanorods (La(OH) 3 NRs) with excellent film forming ability was prepared, and it was first designed to incorporate with carbon nanotubes (CNTs) to modify glassy carbon electrode (GCE) to simultaneously voltammetric determine ascorbic acid (AA), dopamine (DA), uric acid (UA), and nitrite (NO 2 − ). Cyclic voltammetry (CV), transmission electron microscopy (TEM), and X-ray diffraction (XRD) were employed to characterize the sensor. Under optimal conditions, the linear response range for AA, DA, UA, and NO 2 − were 0.5 μmol L −1 to 1.46 mmol L −1 , 50 nmol L −1 to 35.36 μmol L −1 , 50 nmol L −1 to 0.79 mmol L −1 , and 0.55 μmol L −1 to 0.72 mmol L −1 , respectively and the detection limits were 1.67 μmol L −1 , 1.67 nmol L −1 , 1.67 nmol L −1 , and 0.18 μmol L −1 . The sensor demonstrated well stability, high selectivity and sensitivity. More importance, this material can be extended to construct other electrochemical sensors by the immobilization of enzymes and antibodies.
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