COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
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IF 5.4
Qing Chen,Ling Shi,Guiping Xu,Maocong Hu,Mao Peng,Zhenhua Yao
The development of low-cost and efficient bifunctional electrocatalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is of importance for the commercialization of green and sustainable energy conversion devices. In this work, noble metal-free XFeCoNiCu (X = Cr, Mg, and Mn) high entropy alloys were prepared with a facile pyrolytic reduction approach while the structure and composition were characterized by XRD, ICP-OES, TEM, HRTEM, and XPS. The prepared quinary alloys demonstrated excellent activity and stability for both ORR and OER, which was even superior to that of commercial Pt/C and RuO₂. Moreover, all three catalysts exhibited considerable potential for bifunctional catalysis, with a ΔE gap of 0.659 V for CrFeCoNiCu, a ΔE gap of 0.692 V for MnFeCoNiCu, and a ΔE gap of 0.727 V for MgFeCoNiCu, which was much better than that of the Pt/C+RuO 2 combination (0.723 V). The superior performance was further revealed by Density Functional Theory (DFT) calculations with projection density of states (PDOS) and free energy change. The strategy proposed in this study provides an economical approach to design and develop bifunctional electrocatalysts with exceptional performance.
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Materials
·
2024
·Vol. 17
·期 5
·1118
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IF 3.1
Hanyun Xie,Runhua Chen,Yuxia Song,Yan Shen,Fengming Song,Bo He,Xiaomei Jiang,Yifan Yin,Wenming Wang
Transition metals and their oxide compounds exhibit excellent chemical reactivity; however, their easy agglomeration and high cost limit their catalysis applications. In this study, an interpolation structure of a Myriophyllum verticillatum L. biochar-supported Mn/Mg composite (Mn/Mg@MV) was prepared to degrade triphenyl phosphate (TPhP) from wastewater through the activating periodate (PI) process. Interestingly, the Mn/Mg@MV composite showed strong radical self-producing capacities. The Mn/Mg@MV system degraded 93.34% TPhP (pH 5, 10 μM) within 150 min. The experimental results confirmed that the predominant role of IO3· and the auxiliary ·OH jointly contributed to the TPhP degradation. In addition, the TPhP pollutants were degraded to various intermediates and subsequent Mg mineral phase mineralization via mechanisms like interfacial processes and radical oxidation. DFT theoretical calculations further indicated that the synergy between Mn and Mg induced the charge transfer of the carbon-based surface, leading to the formation of an ·OH radical-enriched surface and enhancing the multivariate interface process of ·OH, IO3, and Mn(VII) to TPhP degradation, resulting in the further formation of Mg PO4mineralization.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
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IF 7.7
Zhiheng Luo,Jianxiong Ma,Yan Wang,Yuhan Du,Yujie Liu,Wei Zhang,Yuxiao Lai,Xinlong Ma
The management of bone defects, particularly those with irregular geometries resulting from osteoporotic fractures, remains fraught with challenges. Microspheres have emerged as a promising vehicle for tissue engineering, distinguished by their controlled release, safety, and ease of application. Various bioactive components are integrated into microspheres to improve their performance. Metal-organic frameworks, formed from metal ions interconnected by organic ligands, are increasingly utilized in tissue engineering. Specifically, magnesium-based MOFs are notable for their broad applicability; Mg 2+ ions are instrumental in bone reconstruction and repair, facilitating osteogenesis, angiogenesis, antibacterial effects, and anti-inflammatory properties. Mg-MOF was synthesized using magnesium chloride and gallic acid, and it was incorporated into gelatin microspheres to create Gel@Mg-MOF composite microspheres. Leveraging gelatin's biocompatibility, controlled release, and biodegradability, the composites' biocompatibility was evaluated through toxicity and adhesion assays. Moreover, the osteogenic and angiogenic potentials of the Gel@Mg-MOF microspheres were assessed, alongside their capacity for ROS scavenging. Results suggest that controlled Mg 2+ release from Gel@Mg-MOF microspheres promotes osteogenic activity in RBMSCs and enhances angiogenic potential in HUVECs. Additionally, the gallic acid-containing composite microspheres exhibited antioxidative properties. Collectively, the findings suggest that Gel@Mg-MOF microspheres could provide effective support for bone defect repair, with potential for clinical deployment.
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Science China-Chemistry
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2010
·Vol. 53
·期 7
·1497-1501
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IF 0
Ma Hong,Nie Xin,Cai JiaYing,Chen Chen,Gao Jin,Miao Hong,Xu Jie
The catalytic oxidation of biomass-derived polyhydroxyl compounds provides an efficient and green route for biomass resource utility. Gold nanocrystals supported on Mg(OH) 2 were synthesized by sol-immobilization method, characterized by XRD, TEM, UV-vis DRS, and tested in the selective oxidation of 1,2-propanediol to lactic acid. The gold particle size and the ratio of Au to 1,2-propanediol strongly influenced the catalytic activity. Over Au/Mg(OH) 2 with the majority of gold particles concentrated in 14–18 nm, excellent catalytic performance with 94.4% conversion and 89.3% selectivity to lactic acid has been achieved under 0.3 MPa O 2 at 60 °C for 6 h.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yuchen Xing,Xiuli Shen,Qijian Niu,Hongwei Duan,Chengshun Tang,Bo Tao,Siyu Chen,Qianyi Shangguan,Bo Feng,Haizhang Yu,Zhong Tang,Guanya Ji
Nanoplastics, characterized by their small size, high diffusion, and stability, have emerged as the new class of pollutants posing a global threat. For achieving both chemical and thermal stability of adsorbents, this study synthesized FeMg-LDO@BC, a novel adsorbent prepared through the in-situ growth and calcination of FeMg-layered double hydroxide (FeMg-LDH) on pre-treated biochar. FeMg-LDO@BC demonstrated an excellent adsorption rates and removal efficiencies for polystyrene nanoplastics (PSNPs) as determined by pseudo-first-order kinetic model and Sips isotherm model, reaching a 99.8 % adsorption efficiency and the maximum capacity of 97.93 mg/g. The removal mechanism was primarily attributed to π-π EDA interactions, surface complexation, and hydrogen bonding. Furthermore, the composite exhibited excellent chemical and thermal stability, demonstrating robust environmental adaptability and regenerative performance. After five cycles of adsorption-thermal degradation, FeMg-LDO@BC maintained 80 % of its initial adsorption capacity. The thermal regeneration products were primarily composed of styrene, with the presence of alkenes and aromatic hydrocarbons, confirming the simultaneously degradation of nanoplastics and the regeneration of the biochar adsorbent.
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RUSSIAN JOURNAL OF APPLIED CHEMISTRY
·
2024
·
IF 0.6
Li Hui,Shen Dongxue,Yang Zhe,Ji Guojia,Zhang Zhiwei,Lu Xulin,Zhang Jingmei,Zhao Zhongbao
Abstract Au nanoparticles loaded on biochar (PDA-BC/Au) was prepared using adhesion and reduction properties of polydopamine by in-situ reduction method. PDA-BC/Au was characterized by the specific surface area analyzer (BET), the scanning electron microscope (SEM), the transmission electron microscopy (TEM), X-ray diffractometer (XRD), X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectrometry (FTIR). Analysis results prove the successful synthesis of composites decorated with Au nanoparticles in the biochar matrix coating with polydopamine layer. PDA-BC/Au was employed as an adsorbent to remove the cationic dyes (MB and MG) from aqueous solution. The tests confirm that PDA-BC/Au can remove up to 99.0% of MB within 30 min and achieve removal rate over 97.2% of MG after 60 min adsorption. Adsorption kinetics and isotherm models reflect that the adsorption of dyes by PDA-BC/Au has a better fit with pseudo-secondary kinetic equation and the Langmuir adsorption model, displaying chemisorption-dominated single-molecule layer adsorption mechanism. Additionally, after five recycling cycles, the removal rates of PDA-BC/Au for MB and MG only dropped by 3.10 and 2.58% respectively, making clear good stability for long term use. Collectively, the developed PDA-BC/Au adsorbent indicates enormous promise for cationic dye removal and efficient utilization of waste biomass resources.
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APPLIED CLAY SCIENCE
·
2024
·
IF 5.3
Yi Ye,Linxi Wang,Haiyan Li,Jianhong Luo
Oily wastewater has become one of the great threats to the environment. Membrane separation technology has become a research focus in wastewater treatment due to its advantages in environment protection, low sedimentation cost, low energy consumption and reusability. NPA/ZnMgAl-LDHs (NPA, nylon film material loaded with nano-TiO 2 particles, LDHs , layered double hydroxides) material based on nylon film material (PA) was synthesized using a two-step method. Various characterization methods confirmed the successful introduction of TiO 2 and ZnMgAl-LDHs. The testing of water contact angle (WCA) and underwater oil contact angle (UOCA) confirmed that the original PA substrate possesses hydrophobicity and lipophilicity. The superhydrophilicity and superoleophobicity of NPA/ZnMgAl-LDHs material were brought by the introduction of TiO 2 and ZnMgAl-LDHs. NPA/ZnMgAl-LDHs material shows stable and efficient separation efficiency (> 99%), and exhibits high separation flux in simple oil-water separation and oil in water emulsion demulsification. In addition, its separation efficiency is almost unaffected under environments of different pH, and the separation flux remains at a high level. The photocatalytic activity is another satisfactory result of NPA/ZnMgAl-LDHs material. Methyl orange solution was effectively degraded by NPA/ZnMgAl-LDHs material within 120 min, and the efficiency is up to 99.09%.
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ChemPlusChem
·
2024
·
IF 3
Meng-Ge Wei,Hong-Ru Li,Liang-Nian He
Graphical A series of solid base KF/Mg-Fe bi-metal oxides were fabricated via supporting KF on Mg-Fe bi-metal oxides and calcination. When applied as catalyst to dimethyl carbonate (DMC) synthesis through transesterification of ethylene carbonate (EC) and methanol, this material can afford up to 88 % yield and 97 % selectivity toward DMC in the optimal conditions. It is worth noting that the catalyst can be easily separated by filtration and reused. A series of KF/Mg-Fe oxides were fabricated via the solid-state reaction between KF and Mg-Fe oxides. Especially, when 20 wt % KF was supported on the Mg-Fe bi-metal oxides and calcined at 400–600 °C, the solid material with more basic sites than the support itself was obtained. When applied as catalyst to dimethyl carbonate (DMC) synthesis through transesterification of ethylene carbonate (EC) and methanol, this material can afforded up to 88 % yield and 97 % selectivity toward DMC in 2 h under reflux conditions with the molar ratio of methanol to ethylene carbonate set at 8. It is worth noting that the catalyst was easily separated and reused, retaining at least 89 % catalytic activity during the first four recycles. Although an attenuated activity was still observed due to the inevitable filtration loss and dissolution, this solid base can still provide clues to the development recyclable catalyst in green synthesis of DMC.
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Materials
·
2024
·Vol. 17
·期 3
·605
·
IF 3.1
Jiayi Rong,Mengyang Li,Feng Cao,Qianwei Wang,Mingran Wang,Yang Cao,Jun Zhou,Gaowu Qin
The intermetallic PtBi/MgO/Mg monolithic catalyst was first prepared using non-equilibrium plasma electrolytic oxidation (PEO) technology. Spherical aberration-corrected transmission electron microscope (ACTEM) observation confirms the successful synthesis of the PtBi intermetallic structure. The efficiency of PtBi/Mg/MgO catalysts in catalyzing the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) in the presence of NaBH4was demonstrated. The activity factor for the catalyst is 31.8 s−1g−1, which is much higher than reported values. In addition, the resultant catalyst also exhibits excellent catalytic activity in the organic pollutant reaction of p-nitrobenzoic acid (p-NBA) and methyl orange (MO). Moreover, benefiting from ordered atomic structures and the half-embedded PtBi nanoparticles (NPs), the catalyst demonstrates excellent stability and reproducibility in the degradation of 4-NP. This study provides an example of a simple method for the preparation of intermetallic structures as catalysts for organic pollutant degradation.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Peng Gao,Bohao He,Yu Tian,Chi Wang,Xin Sun,Ping Ning,Kai Li,Fei Wang
Hydrogen fluoride (HF) gas is a major combustion byproduct in non-ferrous metal smelting, aluminum electrolysis, coal combustion, and waste incineration processes. Due to its high corrosivity and toxicity, which pose a serious threat to human health and environmental ecosystems, it is necessary to strictly control HF emissions from industrial processes or remove it using proper methods. In this study, an oxygen vacancy-containing magnesium-based adsorbent (2NC@Mg(NO 3 ) 2 –500) was successfully synthesized via a one-pot method. This adsorbent demonstrated a maximum HF adsorption capacity of 195.65 mg·g −1 (at 90 % efficiency), significantly exceeding values reported in previous literature. The basic sites of magnesium oxide (MgO) were critical for promoting HF dissociation, while oxygen vacancies facilitated HF adsorption and its conversion to magnesium fluoride (MgF 2 ). Density functional theory (DFT) calculations further confirmed the experimental findings, demonstrating that oxygen vacancies significantly enhance HF adsorption on MgO by stabilizing fluoride ions (F - ) at the vacancy sites. The subsequent consumption of these vacancies and the conversion of MgO to MgF 2 led to adsorbent deactivation. This study highlights the important role of oxygen vacancies in HF gas adsorption.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Ruixiang Li,Shu Chen,Beibei Wang,Xiaodan Wang,Xinyu Hu,Sonia Estrade Albiol,Cristian Fabrega Gallego,Hao Shen,Chunhua Luo,Hui Peng,Hechun Lin
Room-temperature gas sensors are crucial for detecting toxic gases and volatile organic compounds (VOCs). Conventional metal oxide semiconductor (MOS)-based sensors, however, often require high-temperature operation and suffer from low sensitivity. Here, we present a one-step mini-mechanochemical synthesis of CuO/M(OH) 2 (M = Mg, Ca) heterostructures that exhibit exceptional room-temperature sensing performance towards triethylamine (Et 3 N). Our results reveal a tenfold enhancement in the sensor response to Et 3 N compared to pristine CuO. This remarkable improvement is attributed to the in-situ formation of oxygen vacancies in CuO induced by the incorporation of M(OH) 2 , as evidenced by X-ray photoelectron spectroscopy (XPS), positron annihilation spectroscopy (PAS), and electron paramagnetic resonance (EPR). Notably, CuO/Mg(OH) 2 demonstrates superior long-term stability, while CuO/Ca(OH) 2 suffers from performance decay due to environmental carbonation. Furthermore, we developed a portable Et₃N analysis device based on the CuO/Mg(OH) 2 sensor, which enables real-time monitoring with Wi-Fi capability and achieves an accuracy within 6 % error across a 1 to 100 ppm detection range. This study not only provides a cost-effective and scalable fabrication method for CuO-based gas sensors but also highlights the potential of CuO/M(OH)₂ in practical applications for environmental monitoring and food safety assessment.
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Nanomaterials
·
2025
·Vol. 15
·期 14
·1135
·
IF 4.3
Mingzhang Zhu,Zeren Zhou,Yanhong Gu,Lina Bing,Yuqin Xie,Zhenjiang Shen,Wanping Chen
In sharp contrast to photocatalysis and other prevalent catalytic technologies, tribocatalysis has emerged as a promising technology to degrade high-concentration organic dyes in recent years. In this study, BaTiO3(BTO) nanoparticles were challenged to degrade methyl orange (MO) solutions with unprecedentedly high concentrations through magnetic stirring. With BTO nanoparticles and home-made PTFE magnetic rotary disks in 50 mg/L MO solutions, 10 h of magnetic stirring resulted in 91.4% and 98.1% degradations in an as-received glass beaker and in a beaker with a PTFE disk coated on its bottom, respectively. Even for 100 mg/L MO solutions, nearly complete degradation was achieved by magnetic-stirring-stimulated BTO nanoparticles in beakers with the following four kinds of bottom: 97.3% degradation in 30 h for a glass bottom, 97.4% degradation in 20 h for a PTFE coating, 97.9% degradation in 42 h for a Ti coating, and 97.4% degradation in 74 h for an Al2O3coating. Electron paramagnetic resonance (EPR) analyses revealed that the generation of reactive oxygen species (ROS) by magnetic-stirring-stimulated BTO nanoparticles is dramatically affected by the bottom material of beakers. These findings suggest an appealing prospect for BTO nanoparticles to utilize mechanical energy for sustainable water remediation.
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