CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Mengdan Ma,Anning Zhou,Tao Hong,Xinyu Jia,Moxuan Liu
Metal-organic frameworks (MOFs) are promising materials for CO 2 adsorption and capture. The unique crystal structure and the open porous structure of MOFs are key factors affecting their CO 2 adsorption performance, but the precise tuning of MOF structures remains a challenge. Herein, we applied the Kamlet-Taft method to investigate the effect of solvent proton-supplying/accepting capaity (β/α parameters) on the structure and CO 2 adsorption performance of Mg-MOF-74 by tuning the reaction solvent polarity. It was found that the ratio of the nucleation rate/growth rate of Mg-MOF-74 could be effectively controlled by adjusting the β/α value of the solvent, realizing the regulation of the crystal structure and morphology of Mg-MOF-74. In addition, the size of solvent molecules played a crucial role in the pore size of Mg-MOF-74. Interestingly, the solvent molecules were competitively coordinated with ligands and participate in the growth of Mg-MOF-74 upon decreasing the β/α value. The crystal structure, morphology and pore size of Mg-MOF-74 could be precisely regulated by the β/α value and molecular size of the reaction solvent, and the highest performing Mg-MOF-74 exhibited a CO 2 adsorption capacity of 7.38 mmol/g.
研究领域:
材料科学
·
环境化学
·
多孔材料
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气体吸附
·
晶体工程
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2024
·
IF 11.2
Haizhen Liu,Liwen Lu,Hui Luo,Jiayi Deng,Guangxu Li,Hua Ning,Yi Fan,Cunke Huang,Zhiqiang Lan,Wenzheng Zhou,Jin Guo,Xinhua Wang
The Li-Mg-B-H composite (2LiBH 4 + MgH 2 ) is acknowledged as a promising material for hydrogen storage due to its large hydrogen capacity (11.4 wt.%). However, the sluggish kinetics and poor reversibility make it difficult to be practically used. In this work, the hydrogen storage performances of 2LiBH 4 + MgH 2 have been significantly improved by a hybrid of bulk NbC and layered Nb 4 C 3 MXene (denoted as “Nb-C”). The 2LiBH 4 + MgH 2 + 6 wt.% Nb-C can release 8.5 wt.% H 2 within 30 min at 400°C and the dehydrogenated composite can absorb 9.3 wt.% H 2 within 30 min at 350°C and 7.5 MPa H 2 . The reversible dehydrogenation capacity maintains at 8.4 wt.% after 24 cycles, with a capacity retention ratio of 95.4%. By contrast, the undoped 2LiBH 4 + MgH 2 suffers from serious capacity degradation, with the capacity decreased dramatically to 3.5 wt.% after 3 cycles. Microstructural studies revealed that the doped composite has uniform particle and elemental distributions and possesses various multiphase interfaces of LiH/MgB 2 /NbC/Nb 4 C 3 , which is beneficial to hydrogen diffusion during the hydrogen uptake and release process. Theoretical studies by first principle calculation presented an extended bond length of the Mg-H and B-H bonds in the 2LiBH 4 + MgH 2 + NbC system, which may also explain the improved hydrogen storage properties of 2LiBH 4 + MgH 2 by addition of Nb-C. This work provides new insights into the role of transition metal carbides in regulating the Li-Mg-B-H hydrogen storage materials both experimentally and theoretically.
研究领域:
材料科学
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理论计算
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Zheng Zhang,Jinfeng Zhang,Zhihua Zhang,Xiao Du,Xiaogang Hao,Xiaowei An,Guoqing Guan,Jun Li,Zhong Liu
A novel physically blended polyvinylidene fluoride (PVDF) and polyacrylic acid (PAA) composite binder enhanced LiMn 2 O 4 /C (carbon black) film based electrode was successfully fabricated, and applied in an electrochemically switched ion exchange (ESIX) process for selective extraction of Li + from high Mg/Li ratio brine. The multifunctional composite binder system enabled the obtained LiMn 2 O 4 /C/PVDF- b -PAA film coated electrode to exhibit superior mechanical, hydrophilic and electrochemical properties compared with the LiMn 2 O 4 /C/PVDF film coated electrode. Based on the density functional theory (DFT) calculations, the ion exchange interaction between H + of –COOH groups in PAA and Li + facilitated the transport of Li + at the electrode interface, which enhanced lithium extraction performance of the film coated electrode. For treating the simulated brine (Mg/Li: ∼500), the intercalation capacity of Li + was about 15.1 mg g −1 , and the total extraction efficiency of lithium reached up to 62.8% after two electrochemical intercalation tests. Moreover, the film coated electrode displayed excellent selectivity towards Li + ions even in pre-treated actual brine (Mg/Li: ∼292.2). The Mg/Li mass ratio in the recovery solution could decrease to 0.46, and the calculated Li + /Mg 2+ separation coefficient reached as high as 631.08. In particular, the highly stable and scalable electroactive film could be prepared effectively, thus increasing its applicability. It is expected that such a LiMn 2 O 4 /C/PVDF- b -PAA film coated electrode could be a promising candidate for the selective extraction of Li + from high Mg/Li mass ratio brines.
研究领域:
材料科学
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电化学工程
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Kangbao Li,Yuanyuan Zhang,Dong Zhang
In the field of construction, structural supercapacitors (SSCs) have been widely noticed due to their simultaneous functions of load-bearing and energy storage. Unfortunately, the currently available electrodes for SSCs are still aimed at application scenarios such as electronics and electric vehicles, and while their performance is good, they are not applicable to the construction sector, which is massive in scale and extremely cost-sensitive industry. Herein, after trade-off between cost and electrochemical performance, a novel low-cost 3D nanomaterial was designed through a facile approach aimed at increasing the areal energy density of SSCs. By growing Mg-Co double hydroxide nanomaterials directly on nickel foam, we achieved a large areal capacitance of 2577 mF/cm 2 at 5 mA/cm 2 (1136.7 F/g at 2.2 A/g). It also exhibits good cycling stability with a capacitance retention of 82.4 % after 10,000 cycles. In addition, SSCs using magnesium-cobalt double hydroxides achieves a high energy density of 285.6 μWh/cm 3 at a power density of 6.31 mW/cm 3 , which is superior to previously reported structural devices. This demonstrates that Mg-Co double hydroxide electrode has good suitability with SSCs and effectively improves the areal energy density of SSCs. Our proposed method also provides a faster and more reliable pathway for low-cost electrode preparation in SSCs, which may lead to the development of a new generation of SSCs.
研究领域:
材料科学
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能源工程
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Chun Sun,Jiazhi Cui,Yiwei Zhao,Zhihui Deng,Yelin Ding,Kai Lian,Junhuan Zhao,Zhongjie Zhai,Jiachen Han,Zhengtong Wang,Xiaohui Liu,Wengang Bi
Environmentally friendly metal halides with reversible transformation of structure and luminescence properties have become a focal point of interest in the areas of anti-counterfeiting and sensors. Herein, Zn 2 + -doped DMAMnBr 3 and Mg 2+ -doped DMA 2 MnBr 4 were successfully synthesized using the evaporation-crystallization method. After doping Zn 2+ in DMAMnBr 3 , the photoluminescence quantum yield (PLQY) is enhanced from 18 % to 40 %. For DMAMnBr 3 , the introduction of Zn 2+ ions also accelerates the color-changing rate upon water absorption due to the tendency of Zn 2+ to form tetrahedral structures. Besides, the DMAMn 0.8 Zn 0.2 Br 3 exhibits excellent sensitivity. Hence, a temperature detection software is developed, which is capable of monitoring temperatures in the range of 323–403 K. For DMA 2 MnBr 4 , the incorporation of Mg 2+ ions not only leads to the enhancement of PLQY but also reduction of melting temperature. The theoretical calculation indicates that the decrease in the melting point is caused by the reduction in lattice energy. Utilizing this characteristic, we produced rewritable paper with excellent reusability. Finally, anti-counterfeiting labels were created using both DMAMn 0.8 Zn 0.2 Br 3 and DMA 2 Mn 0.95 Mg 0.05 Br 4 . The concealed information can be deciphered through straightforward heating. These results hold promise for extending the potential applications of manganese-based perovskite materials.
研究领域:
材料科学
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光学
·
传感器技术
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防伪技术
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产品关联
DOI
高影响因子
CHEMOSPHERE
·
2019
·
IF 5.108
Jian Lu,Qi Sun,Jun Wu,Guangcan Zhu
Techniques for reutilization of the discarded bischofite are limited while efficient recovery of the Mg(OH) 2 nanoparticles from water during the synthesis and reuse processes is a challenge. In this study, the Fe 3 O 4 @Mg(OH) 2 core-shell magnetic nanoparticles were firstly prepared from discarded bischofite and used as catalyst for improving the ozonation of metronidazole (MNZ). The removal rate constant of MNZ increased by 694.7% using Fe 3 O 4 @Mg(OH) 2 . Compared with the Mg(OH) 2 control, the MNZ removal rate constant of Fe 3 O 4 @Mg(OH) 2 treatment was almost tripled. The persistent high catalytic activity of the Fe 3 O 4 @Mg(OH) 2 catalyst was observed since the MNZ removal rate constant decreased by just 13.2% in the third reuse run. The Fe 3 O 4 @Mg(OH) 2 primarily enhanced ozone decomposition through producing hydroxyl radicals . The MNZ removal rate constant increased from 0.075 min −1 to 0.643 min −1 as catalyst dose increased from 0 to 0.6 g L −1 while it decreased by 96.0% when its initial concentration increased from 10 to 200 mg L −1 . The maximum removal rate constant was observed at 25 °C when temperature increased from 15 °C to 35 °C. The Cl − , HCO 3 − , SO 4 2− , Ca 2+ , Mg 2+ ions could jeopardize MNZ degradation. The antibacterial activity of MNZ was eliminated after catalytic ozonation while the mineralization efficiency was almost doubled. The nitro group reduction and the cleavage of hydroxyethyl bond were two main transformation pathways of MNZ. These findings suggest that Fe 3 O 4 @Mg(OH) 2 nanoparticle made from discarded bischofite is the promising catalyst for the ozonation of antibiotics in the terms of water purification practice and reutilization of the bischofite.
研究领域:
环境科学
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纳米技术
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水处理
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产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 6
·1-8
·
IF 5.479
Yalikun Nuerbiya,Mamat Xamxikamar,Li Yongtao,Hu Xun,Wang Ping,Hu Guangzhi
The authors describe a method for synthesis of a nanomaterial consisting of porous carbon encapsulated Mg-Al-Si alloy (denoted as Mg-Al-Si@PC) nanocluster. The nanocluster was synthesis by a solvothermal reaction, followed by high-temperature annealing. The nanoclusters were used as a novel immobilization platform for electrochemical sensing of rutin. The electrochemical behavior of rutin at a modified electrode was investigated by cyclic voltammetry and differential pulse voltammetry. The modified electrode demonstrates a high electrocatalytic activity toward rutin oxidation at a relatively low working potential (0.6 vs. Ag/AgCl). Under optimal conditions, the sensor has a linear response in the 1–10 μM rutin concentration range, and a 0.01 μM lower detection limit (at an S/N ratio of 3). It was successfully applied to the quantification of rutin in pharmaceutical tablets, and satisfactory results were obtained. Furthermore, the results correspond with those with the standard method and with the amounts indicated by the producer, respectively.
Schematic diagram of the Mg-Al-Si@PC nanocluster preparation process and electroanalysis mechanism.
研究领域:
材料科学
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电化学
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纳米技术
·
分析化学
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产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 38
·26076-26082
·
IF 10.7
Haifeng Yu,Erdong Zhang,Jinxun Yu,Songmin Yu,Yaoguo Fang,Ling Chen,Hao Jiang,Chunzhong Li
Olivine-type LiMnxFe1−xPO4 (LMFP, 0 < x < 1) is poised to supplant LiFePO4 cathode materials with a ∼20% energy-density increase for Li-ion batteries (LIBs). However, its intrinsic low conductivities and MnO6 octahedral unit-cell Jahn–Teller distortion limit its power capability and cycling life. Herein, we report a Mg/Ni dual-doped and carbon-coated LMFP micro-sized secondary sphere with greatly enhanced reaction kinetics and superior structure stability. Ni2+ reduces the average valence state of Mn ions to alleviate Jahn–Teller distortion by participating in charge compensation during charging while improving electronic conductivity together with carbon coating. Mg2+ with a smaller ion radius (65 pm) significantly widens the Li-ion transfer channel by extending Li–O bonds. The as-obtained LMFP cathodes increase reversible specific capacity by about 2.4 times at 5C compared with a pristine sample, reaching 115 mA h g−1. In a pouch-type full cell, 92% of its initial capacity is still maintained after 2000 cycles at 1C, demonstrating its attractive potential for practical application in high-power and long-life LIBs.
研究领域:
材料科学
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电化学
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DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 55
·43906-43916
·
IF 3.84
Zakir Hussain,Li Daosheng,Li Xi,Kang Jianxiong
A study has been designed for a fluoride adsorbent synthesized by a co-precipitation approach of Mg(II), Al(III) and La(III) salts (MAL) in 2 : 1 : 2 ratios. The prepared material illustrated relatively stable fluoride adsorption potential and an amorphous structure at temperatures lower than 600 °C. The defluoridation capacity of a 2 g L−1 adsorbent dose at room temperature was observed to be between 24.08 to 98.28% for a 10 and 20.66 mg L−1 fluoride solution in a broad pH range (2 to 12), while for a 45.45 mg L−1 solution, it varied between 26.49 to 80.42%. The adsorption process on MAL was endothermic in nature (−ΔG), follows pseudo second order kinetics (R2 = 0.999) and best fitted with a Langmuir sorption isotherm model (R2 = 0.9985). The prepared material was characterized by XRD, SEM, BET, EDX, FTIR and XPS, whereas contact times, sorption kinetics, dosage and the effect of major co-existing anions were carried out for the optimization of the adsorbent. In addition to amphoteric behavior of Al(III) in the composite material, the effect of fluoride concentration and sorbent quantity in a batch process appeared to be important factors in maintaining the near neutral pH of the treated water. Similarly, one other factor, flow rate was found to affect the pH in the column adsorption process. Regeneration of up to 95.71% of the fluoride loaded adsorbent was achieved with a methanol and HCl mixture. The results showed that Al(III) acted as amphoteric reagent and keeps the pH within drinking water range or near neutral.
研究领域:
环境科学
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材料科学
·
化学工程
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Yu Yang,Meng Du,Jiaxin Liang,Qian Xu,Wei Liu,Ang Li
The flow-through electroactive membrane adsorption method has been proved to be a promising strategy to enrich low-concentration phosphate. However, the challenges of selective adsorption of phosphate and poor regeneration restrict its industrial application. Here, this study proposed a novel bimetallic Mg-UiO-66@rGO electrode material through the introduction of Mg(II) into UiO-66, which possessed remarkable adsorption selectivity and optimal reproducibility among the reported electrode materials. The maximum phosphate adsorption capacity of Mg-UiO-66(13)@rGO (Zr/Mg = 3:1) was 62.81 mg⋅g −1 at 3.2 V. Furthermore, it maintained the excellent adsorption properties in the presence of all competitive anions and after 30 times of continuous adsorption–desorption. In actual wastewater, Mg-UiO-66(13)@rGO still represented excellent adsorption kinetics of 0.51 mg⋅(g⋅min) −1 and equilibrium adsorption capacity of 61.2 mg⋅g −1 . The superior selectivity of Mg-UiO-66@rGO was attributed to the establishment of coordinative unsaturated metal sites (CUMSs), thus increasing the adsorption sites. The synergic effect of electric field facilitates the breaking and formation of coordination bonds between charged ions and deeper binding sites, boosting the adsorption–desorption ability. Notably, the structural stability is also a key factor in promoting repeated material regeneration. This study advances electrode material to a new level by introducing CUMSs and bimetallic synergies.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2024
·
IF 6.9
Pengfei Yang,Jianhong Bi,Hua Zhang,Zhenyu Wu
Herein, we explored the efficacy of ethylenediaminetetraacetic acid (EDTA) intercalation modified layered double hydroxides (LDHs) composites for removing the anionic dye methyl orange (MO) from aqueous solutions. EDTA intercalated layered hydroxides (EDTA-Mg/Fe LDHs) with a 4:1 Mg/Fe molar ratio have been successfully prepared and thoroughly characterized using SEM-EDS, FTIR, XRD, XPS, UV-Vis and Zeta potential analysis. Batch adsorption experiments were conducted to evaluate the adsorption performance of the innovative adsorbent on MO. The results indicated successful EDTA loading into Mg/Fe LDHs, exhibiting excellent adsorption performance for MO. At pH 6.0, with a 0.03 g adsorbent dose, MO removal exceeded 91.10 % within 90 min, following a pseudo second order kinetic model. The maximum adsorption capacity reached 1207.43 mg/g, fitting well with the Redlich Peterson model. Thermodynamic parameters suggested a spontaneous and favorable adsorption process. Furthermore, we assessed the desorption and regeneration effectiveness of EDTA-Mg/Fe LDHs, emphasizing the importance of developing cost-effective and environmentally friendly adsorbents with practical applications and scientific significance.
研究领域:
环境科学
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材料科学
·
化学工程
·
水处理
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产品关联
DOI
高影响因子
AICHE JOURNAL
·
2024
·
IF 3.5
Yanru Zhu,Zhen Zhang,Yunfei Zou,Jian Zhang,Zhe An,Xin Shu,Hongyan Song,Jing He
Catalytic conversion of biomass-derived 5-(hydroxymethyl)furfural (5-HMF) into carbon-increased hydrocarbons as drop-in energy-rich biofuels has received a great deal of concern for the development of sustainable chemical industry. Here, we demonstrate a one-pot conversion of 5-HMF into C 9 -alkanes on one single catalyst, acidic–basic layered double oxides (Mg(Al)(Zr)O) supported CuCo alloy. The well-defined multifunctional catalytic sites with harmonious combination carry out cascade catalysis, affording C 9 -alkanes (including 30% of more value-added branched-cycloalkanes) in 83% yield. The basic–acidic sites on Mg(Al)(Zr)O show high activity for aldol condensation of 5-HMF and acetone, producing 4-[5-(hydroxymethyl)-2-furanyl]-3-buten-2-one (HAc) in a yield of >99%. The engineered Co–Cu–Co linkages on supported CuCo perform efficient hydrodeoxygenation, affording C 9 -alkanes in a selectivity of 96% from HAc. C 9 -cycloalkanes are generated from the cyclization of the corresponding monohydric alcohol intermediates by the synergy of acidic and CuCo sites in the hydrodeoxygenation reaction.
研究领域:
化学工程
·
催化
·
可再生能源
·
生物质转化
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）