DESALINATION
·
2023
·
IF 9.9
Qingyi Wang,Yongping Dong,Junmei Ma,Huimin Wang,Xuping Xue,Chaojie Bai,Mingjie Lin,Lingping Luo,Congjie Gao,Lixin Xue
Polyamide/polyethylene thin film composite (PA/PE-TFC) NF membranes were prepared from reverse-phase interface polymerization (RIP) for improved Mg(II)/Li(I) separation. RIP processes between 1,3,5-benzenetricarbonyl chloride (TMC) in bottom organic phase and piperazine (PIP) in upper aqueous phase were developed to form continuous and intact surface PA separation layers on PE porous substrates thinner than traditional polysulfone (PSF) based substrates. After activation with isopropyl alcohol (IPA), PA/PE-TFC-IPA NF membranes were formed, whose NF performance could be tuned by adjusting the preparation conditions. When TMC concentration was kept at 0.15 % w/v, RIP with low PIP concentration (0.025 wt%) yield PA/PE-TFC-IPA NF membranes with negatively charged surfaces , high Na 2 SO 4 rejection rate (95 % ± 3 %) and water permeance (13–19 L·m −2 ·h −1 ·bar −1 ). RIP with high PIP concentration (0.3 wt%) formed PA/PE-TFC-IPA NF membranes with less negative surfaces, high MgCl 2 rejection rate (94.3 ± 0.7 %), low water permeance (4.8 ± 0.3 L·m −2 ·h −1 ·bar −1 ), and high Mg(II)/Li(I) separation coefficient S Li/Mg (18 ± 1) for 1000 ppm LiCl and MgCl 2 mixed solution. PA/PE-TFC-IPA NF membranes also showed good long-term stability and improved anti-fouling performance for positively charged pollutants, bearing high potential for applications in the lithium extraction processes.
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高影响因子
MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Zilin Meng,Ziwei Ju,Jiaxuan Fan,Yujiao Wang,Xingyi Wu,Runhua Lu,Wenfeng Zhou,Haixiang Gao
A low-cost and environmentally friendly polydopamine modified layered double hydroxides (PDA/LDH) was prepared, and a novel fluorescent “turn-off” sensor was established for rapid detection of thiram. The material was characterized using the transmission electron microscope (TEM), Fourier transform-infrared (FT-IR), X-ray diffraction (XRD), X-ray photo-electronic spectroscopy (XPS) and other methods. The electrostatic interaction, hydrogen bonding and S-π interaction between PDA/LDH and thiram were mostly attributed to the sensing of thiram. Through the internal filter effect (IFE), the fluorescence of the PDA/LDH could be effectively quenched by thiram. The limit of detection (LOD) was determined to be 25 μg L −1 under optimal conditions, while the concentration of thiram in the range of 50–50000 μg L −1 exhibited a satisfactory relationship with the change in fluorescence intensity. Furthermore, the prepared probes were successfully applied on apple and pear samples, in which the recovery rate could reach 92.06–104.90 %. The synthesis of PDA/LDH was quite simple, and the detection of thiram could be accomplished right away when the sensor and thiram were combined. All the above results demonstrated the high potential of the established method in practical applications.
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JOURNAL OF THE ENERGY INSTITUTE
·
2022
·
IF 6.47
Kai Shi,Xia An,Yali Du,Zhaoyang Fan,Xu Wu,Xianmei Xie
A series of nickel catalysts supported on Al 2 O 3 that modified with Ce-, Zr-, and Mg-promoter were prepared via a sol-gel method and a subsequent impregnation method for the ethanol steam reforming reaction (ESR). The effect of promoters on the carbon deposition was focused. Compared with Ni/Al 2 O 3 catalyst, the introduction of different promoters decreased the selectivity for CH 2 CH 2 to different extent, especially, Ce-, Mg- containing catalysts completely suppressed the production of CH 2 CH 2 for 30 h tested at 500 °C. And the medium and strong acid sites were confirmed as the major sites for CH 2 CH 2 production. Encapsulation carbon derived from ethylene takes the primary responsibility for carbon deposition, and the formation of metal carbide is the other reason for causing carbon deposition. Among the tested catalysts, Ni/Mg–Al 2 O 3 exhibited a better performance for anti-carbon, which was attributed to the blockage of medium and strong acid sites as well as the high Ni crystallinity .
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Materials Research Express
·
2022
·Vol. 9
·期 6
·065505
·
IF 2.025
Qinghong You,Xiulian Yin,Jun Wang,Chunhua Dai
A recyclable heterogeneous KF/Ca-Mg-Al-O catalyst was prepared by co-precipitation and calcination processes. The characteristics of the catalyst were investigated using FTIR, XRD, TG-DTG and SEM. Response surface methodology was utilized to obtain the best most extreme biodiesel production yield. The ideal biodiesel production conditions were: the amount of catalyst was 3 wt%; the reaction temperature was 65 °C; the alcohol oil molar ratio 9.8:1, the reaction time was 3.5 h. Under these amended conditions, the average biodiesel yield was 95.19%, which is well in close concurrence with the worth anticipated by the model. The repeatability of catalysts was studied. After using the catalyst seven times, the catalytic efficiency was only reduced by 2.7%. These results indicate that the catalyst has good catalytic efficiency and is recyclable.
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CHEMOSPHERE
·
2022
·
IF 8.943
Chao Ren,Hongtao Wang,Junfeng Ji,Wei Li
Calcination is an effective way to improve the F − adsorption capacity of layered double hydroxide (LDH) materials, however, a molecular scale understanding of the enhanced defluoridation capability of calcined LDHs (CLDH) is lacking. This study investigated the mechanisms of F − adsorption by CLDH using 19 F solid-state NMR, X-ray photoelectron spectroscopy (XPS), and high-resolution TEM . Under calcination process, LDH underwent three periods: surface dehydration below 200 °C, structural dehydroxylation at 200–400 °C, and release of interlayer carbonate groups above 400 °C. Additionally, XPS and XRD characterization showed that CLDH could not recover to the original structural symmetry even after rehydration and reconstitution. The F − affinity was greatly enhanced for the calcined LDH, especially at high pH. At pH 10, the adsorption capacity could reach 22.0 mg F − /g for CLDH (500 °C calcined), about 6 times larger than that of LDH. The XRD analyses revealed that the F-adsorbed CLDH had a poorer crystalline degree as the calcination temperature increased, consistent with the TEM observation of abundant defects and Mg/Al oxides on the CLDH sheets. 19 F solid-state NMR spectra of the CLDH after F − adsorption showed that the formation of surface Al–F is the predominant F − adsorption mode at pH 7, whereas the Mg–F local coordination mode is the pronounced F − adsorption mechanism under alkaline conditions (pH 10). The present study provided a comprehensive understanding of CLDH in F − adsorption and suggested that calcination is a promising treatment for promoting the efficacy of polluted anion scavenging.
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高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2023
·
IF 10.9
Huan Yao,Ruifeng Zhang,Yu Wen,Yue Liu,Gang Yu,Zhi-Hui Xie
Metal-organic framework [MOF, i.e., NH 2 -MIL-53(Al)] modified TiO 2 (NMT) composite photoanodes were successfully prepared by hydrothermal synthesis and were used for the photoelectrochemical cathodic protection (PECCP) of nickel-plated magnesium alloy (Mg/Ni). Results showed that the synthesis temperature significantly impacted the morphology and PECCP performance of the NMT photoanodes. The NMT@150 photoanode prepared at a reaction temperature of 150 °C exhibited the best PECCP performance and produced a current density of 1980 μA cm −2 under visible light irradiation, which was 19.8 times higher than that of a single TiO 2 photoanode. The composite photoanode could polarize the open circuit potential of the coupled Mg/Ni electrode to -876 mV and remain relatively stable within 35 h. XPS and EPR tests showed that a Z -scheme heterojunction was formed between the NH 2 -MIL-53(Al) and TiO 2 nanotubes, allowing the photogenerated electrons to accumulate mainly on the conduction band of NH 2 -MIL-53(Al). The heterojunction greatly promoted the separation and transfer of photogenerated electron-hole in the NMT composite photoanode, significantly enhancing the PECCP performance for Mg/Ni.
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RSC Advances
·
2023
·Vol. 13
·期 38
·26528-26543
·
IF 3.9
Asma Zaka,Muhammad Waqas Iqbal,Amir Muhammad Afzal,Haseebul Hassan,Hira Rafique,Saikh Mohammad Wabaidur,Ahmed M. Tawfeek,Eshan Elahi
In this work, a novel bimetallic Fe–Mg/MOF was synthesized through a cost-effective and rapid hydrothermal process. The structure, morphology, and composition were examined using X-ray diffraction (XRD), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy. Further, the Brunauer–Emmett–Teller (BET) measurement showed a 324 m2 g−1 surface area for Fe–Mg/MOF. The Fe–Mg/MOF achieved 1825 C g−1 capacity at 1.2 A g−1 current density, which is higher than simple Fe-MOF (1144 C g−1) and Mg-MOF (1401 C g−1). To assess the long-term stability of the asymmetric device, the bimetallic MOF supercapattery underwent 1000 charge/discharge cycles and retained 85% of its initial capacity. The energy and power densities were calculated to be 57 W h kg−1 and 2393 W kg−1, respectively. Additionally, Fe–Mg/MOF showed superior electrocatalytic performance in hydrogen evolution reaction (HER) by demonstrating a smaller Tafel slope of 51.43 mV dec−1. Our research lays the foundation for enhancing the efficiency of energy storage technologies, paving the way for more sustainable and robust energy solutions.
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JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS
·
2021
·
IF 3.935
Xinying He,Han Cao,Xia Li,Yan Li,Yunqiu Yu
Lysophosphatidylcholine (LPC) was commonly known as a class of significant differential metabolites of high relevance with many diseases including psoriasis, of which the accurate determination is of great importance to diagnosis or prediction to many diseases. However, it is challenging and complicated because of the enormous biological sample complexity and impurities interference. In this study, we synthesized a magnetic nanocomposite MG@PD@TiO 2 and took advantage of the interactions of Lewis acid−base between the phosphate groups in LPCs and Ti ions on MG@PD@TiO 2 nanomaterials for selective separation and enrichment of LPCs from complex biological matrix. The solid-phase extraction sample pretreatment process by means of MG@PD@TiO 2 nanomaterials coupled with LC–MS/MS method was then applied to actual determination of six typical LPCs (LPC 10:0, 14:0, 16:0, 18:0, 18:1, 22:0) in human plasma. The extraction conditions were scientifically optimized by single-factor test (adsorbent amount, adsorption and desorption time, elution solvent type, eluant volume). Under the optimal conditions, the detection limits (LOD, S/N = 3) and quantification limits (LOQ, S/N = 10) were 1 and 5 ng/mL for LPC 10:0 and LPC 14:0, 0.02 and 0.1 ng/mL for LPC 16:0 and LPC 18:1, 0.05 and 0.2 ng/mL LPC 18:0 and LPC 22:0, respectively. The intra- and inter-day precisions were 3.82–12.60 % (n = 6) and 3.29–13.50 % (n = 6) respectively, the recoveries were in the range of 91.92–113.69 % and the stability of the analytes in the matrix performed well with RSDs≤15.51 %. Finally, the developed method was successfully applied to the accurate determination of six LPCs biomarkers of plasma in patients with psoriasis (n = 10) and control groups (n = 10).
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JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2021
·Vol. 99
·期 1
·122-131
·
IF 2.326
Liu Shisheng,Wei Xiaohui,Lin Song,Guo Minjie
The preparation of MgO nanoparticles with relatively small sizes and highly active surface areas is still a great challenge nowadays. The principal objective of this work was to investigate and optimize the calcined conditions of MgO with smaller sizes and higher surface areas, which contributed to its better degradation ability towards paraoxon pollutants. Firstly, the aerogel Mg(OH) 2 nanosheets with an increased surface area of 349.0 m 2 /g was prepared via a combined sol–gel-hydrothermal method. Then the calcined MgO nanoparticles with different morphology, size dimensions, and specific surface areas were obtained at different calcination temperatures from 400 to 800 °C. The optimized average grain size of MgO obtained at 600 °C was achieved to 8.7 ± 3.2 nm with a relatively high surface area up to 231.4 m 2 /g. Meanwhile, such as-prepared MgO nanoparticles showed an excellent performance towards paraoxon degradation, and the maximum degradation amount of paraoxon-ethyl was up to 57.8 mg/g@90 min at room temperature. The kinetics of degradation was consistent with the pseudo-second-order model ( R 2 > 0.99). Such excellent degradation capacity was derived from more generations of superoxide radical (•O 2 − ) sites as revealed by using the nitro blue tetrazolium (NBT) as a probe. The results indicated that the MgO nanoparticles reported herein could be an effective candidate for the environmental remediation of organophosphorus toxin pollutants due to their facile scale-up, low cost, eco-friendly characteristic, and high removal efficiency.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Xin Zhou,Qianwei Liang,Boqian Yang,Yuyu Chen,Yuanyuan Fang,Hanjin Luo,Yushan Liu
Compounding a single component with a specific function into a composite material that can fully exert synergy effects according to demand is the key to achieving the expected function and expanding emerging applications. Herein, anchoring δ -MnO 2 with strong oxidizing ability on the surface of Fe/Mg-MIL-88B with superior uptake ability for As(V) to form an amorphous nanocomposite with multiple functions for removing more toxic As(III). Due to special construction and rational design, the fabricated nanocomposite demonstrated an excellent As(III) removal performance over a very broad pH range of 3 to 10. Impressively, the adsorption efficiency of the obtained δ -MnO 2 @Fe/Mg-MIL-88B on As(III) is greatly improved, and the maximum adsorption capacity under laboratory conditions is as high as 221.04 mg/g in room temperature. Notably, the residual concentration of arsenic will drop below 10 μg/L, as long as the initial As(III) concentration is not higher than10 mg/L, which is very critical for further promotion. In general, the δ -MnO 2 @Fe/Mg-MIL-88B exhibits excellent promise in removing As(III) from sewage, and its applicability in practical complex water treatment deserves further study.
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ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2025
·
IF 6.1
Zixin Lin,Guanghui Wang,Xuewen Zhang,Wenchao Deng,Mingliang Chen,Zhongkui Zhou,Nansheng Deng
The application of herbicides, along with human activities such as mining and metal smelting, results in the release of organic pollutants and heavy metals into the environment, thereby posing significant risks to both human health and ecosystems. There is a pressing demand for efficient technologies to remediate soil contaminated with organic pollutants and heavy metals. In this paper, a novel zinc-modified biochar supported Mg-Fe layered double hydroxide (ZnBC/MgFe-LDH) composite was fabricated and characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), and X-ray diffraction (XRD) techniques. Batch adsorption experiments revealed that the ZnBC/MgFe-LDH exhibited excellent adsorption performance, achieving maximum adsorption capacities of 268.45 mg/g for Cd(II) and 165.04 mg/g for atrazine. Indoor culture, column leaching, and pot experiments demonstrated significant immobilization of atrazine and cadmium in co-contaminated soil. After 28 days, leaching concentrations of atrazine and cadmium decreased by 89.7 % and 90.3 %, respectively. Dynamic leaching experiments showed cumulative losses reduced by 44.55 % for atrazine and 57.70 % for cadmium. Additionally, achieving a non-desorbable state of atrazine at 65.03 % and a stable state of cadmium at 49.34 % in the co-contaminated soil indicates a significant stabilization effect. Pot experiments revealed that using ZnBC/MgFe-LDH notably boosted the biomass of maize seedlings. Compared to the control group, the bioconcentration factor (BCF) and translocation factor (TF) of atrazine decreased by 63.52 % and 59.27 %, respectively, whereas the BCF and TF of cadmium decreased by 71.71 % and 32.48 %, respectively. The ZnBC/MgFe-LDH composite immobilizes cadmium in soil primarily through surface complexation, ion exchange, and co-precipitation mechanisms. However, pore filling, π-π interactions and hydrogen bonding are the main mechanisms by which the composite immobilizes atrazine in soil. These findings provide a potentially effective material for stabilizing soils contaminated with both organic pollutants and heavy metals.
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高影响因子
RARE METALS
·
2025
·
IF 11
Zheng Hao-Yuan,Jin Chen,Che Hang,Lee Chia-Tse,Liu Guang,Wang Li,Zhao Yu-Yuan,Liu Hai-Zhen,Wang Xin-Hua,Yu Yi-Feng,Yan Mi
The Li–Mg–N–H (Mg(NH 2 ) 2 –2LiH) system, as a high-capacity Mg-based metal hydrogen storage material (5.6 wt%), has broad prospects for in vehicle hydrogen storage applications, but it still has high hydrogen ab/desorption barriers. To improve its hydrogen storage performance, a nanohydrogen storage alloy was innovatively combined with Mg(NH 2 ) 2 –2LiH, AB5 type nanohydrogen storage alloy LaNi 5 was prepared by co-precipitation method. Nano LaNi 5 and single-walled carbon nanotubes (SWCNTs) were co-doped into the Mg(NH 2 ) 2 –2LiH system at a ratio of 10 wt% and 2 wt%, significantly enhancing the hydrogen storage performance of Mg(NH 2 ) 2 –2LiH. The initial hydrogen ab/desorption temperatures of the co-doped system decreased from 110/130 °C to 45/85 °C. The release of by-product ammonia is significantly inhibited. 4.73 wt% H 2 can be ab/desorption in 150 min at 180/170 °C. Cycle tests show that the co-doped system can still maintain a hydrogen storage capacity of 4.75 wt% after ten hydrogen release cycles. Mechanism and density functional theory study have shown that during the hydrogen release process, partially hydrogenated LaNi 5 weakens the chemical bonding in Mg(NH 2 ) 2 , promoted the dissociation of hydrogen from the Mg(NH 2 ) 2 –2LiH system, while playing a dual role of "hydrogen overflow" and "hydrogen pump". SWCNTs act as auxiliary agents, helping to refine particle size and increase thermal conductivity. The synergistic effect of the two optimizes the comprehensive hydrogen storage performance of Mg(NH 2 ) 2 –2LiH. This study provides a new research method for improving the comprehensive hydrogen storage performance of Mg-based metal hydrogen storage materials using rare earth element catalysts. Graphical abstract
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