SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Zeming Qiu,Feiyu Gao,Yuhan Zhang,Jinzhou Li,Yang You,Xuewei Lv,Jie Dang
Biomass adsorbents possess significant potential for both metal recovery from industrial leaching solutions and wastewater treatment. However, standalone biomass materials suffer from the drawback of low adsorption capacity. In this study, by the combination of metal–organic frameworks (MOFs) with organic biomaterials, a novel aerogel of aminated ZIF-8 composite cellulose (CPEZN) was developed for molybdenum ions adsorption, and the incorporation of aminated ZIF-8 improved the availability of reactive groups. The unique aerogel structure effectively prevented the accumulation of MOFs, thereby increasing the specific surface area and improving the exposure of active site. In addition, the positively charged surface of CPEZN effectively adsorbed molybdenum ions. Experimental results showed that the introduction of ZIF-8-NH 2 improved the adsorption performance of the composites. The adsorption of Mo(VI) followed the Langmuir adsorption isotherm model, and its adsorption rate followed the pseudo-second-order model. The adsorbent exhibited a maximum Mo(VI) adsorption capacity of 872.39 mg/g at pH = 3, and a removal rate of more than 80 % in mixed coexisting ion solutions. Moreover, the adsorbent demonstrated good stability, with a removal rate of above 80 % after 5 cycles of adsorption. Comprehensive characterizations revealed that the adsorption mechanism of Mo(VI) on CPEZN was a synergistic effect of chemisorption, electrostatic interaction, redox, and complex ligand processes. The simulated industrial wastewater adsorption experiment showed that the prepared adsorbent had good removal ability for molybdenum ions. This study not only provides a reference for the design and preparation of MOF and biomass-based composite adsorbent materials, particularly in terms of understanding the adsorption mechanism and designing high-capacity functional groups, but also provides a theoretical basis for its practical application.
研究领域:
环境科学
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材料科学
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化学工程
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产品关联
DOI
高影响因子
CHEMISTRY OF MATERIALS
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2024
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IF 7.2
Zhongyuan Li,Mengdi Xu,Wuqi Liu,Xuesong Wang,Ye Li,Xianju Zhou,Zhen Fang,Lixin Ning
Broadband near-infrared (NIR) luminescent materials hold the key to next-generation, smart, NIR light sources. The emerging halide perovskite materials are regarded as promising candidates for optoelectronics because of their superior optical properties and easy solution processability. However, it remains a major challenge to realize efficient and thermally stable broadband NIR luminescence in these materials. Herein, we report a novel strategy to achieve broadband NIR luminescence by utilizing the transitions from the lowest 1T2 level of Mo4+ to the components of its 3T1 ground state in the soft Cs2Zr(Cl,Br)6 lattice. The multiple transitions, each occurring within the (4d2) t22 crystal-field configuration and containing zero-phonon and vibronic contributions, superimpose on each other to generate the broadband NIR emission. The emission spectrum encompasses the long wavelength region from 800 to 1400 nm centered at 970 nm with a full width at half-maximum of 170 nm. More importantly, the title NIR phosphor shows an exceptional quantum efficiency (66.9%) and thermal stability (67%@150 °C). The as-fabricated NIR phosphor-converted light-emitting diode shows great potential as an NIR lighting source. This research opens a new horizon for realizing high-performance broadband NIR luminescence by exploiting multiple electronic transitions of activators in the soft lattice.
研究领域:
材料科学
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光学
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产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
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2023
·Vol. 21
·期 2
·1191-1198
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IF 2.1
Junpeng Wu,Shijun Dong,Huan Li,Hui Zheng,Qiong Wu,Peng Zheng,Liang Zheng
With the advancement of electrical and electronic devices, overcoming electromagnetic pollution turns into an urgent problem. In this work, high-valence molybdenum (Mo 6+ ) was doped into M-type hexagonal barium ferrite (BaFe 12-x Mo x O 19 ) to improve its electromagnetic performance. The relationship between the Mo 6+ doping concentration and the crystallographic structure, morphology and electromagnetic properties was studied in detail. Structural characterizations authenticate that the Mo 6+ ions prefer the 2b site, increasing the lattice values and grain size, and boosting more Fe 3+ conversion into Fe 2+ . The magnetic hysteresis loops demonstrate a reduction of saturation magnetization and coercivity values with the increase of Mo 6+ concentration. While the microwave absorption properties were obviously improved by the doping Mo 6+ , and obtained the highest RL min value of -56.12 dB@16.1 GHz and effective absorption bandwidth of 4.2 GHz at x = 0.1, displaying a potential role in absorbing material.
研究领域:
材料科学
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电磁学
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Yuxuan Ren,Junxian Wang,Yunfeng Guo,Di Li,Jiamao Li
The influences of Mo 6+ substitution at the B-site of scheelite structure on the sintering character, microstructures, lattice vibrational characteristics, and dielectric properties of BaW 1- x Mo x O 4 ( x = 0.10–0.30) ceramics were studied in detail in this paper. The sintering temperature of BaW 1- x Mo x O 4 ceramics was effectively reduced to less than 950 °C through forming a scheelite solid solution. The densification and the quality factor ( Q × f ) of BaW 1- x Mo x O 4 ceramics were also enhanced compared with pure BaWO 4 ceramic. Raman spectroscopy confirmed that the dielectric constant (ε r ) was highly correlated with molecular polarizability, and the Q × f was strongly dependent on the symmetric stretching bond of [WO 4 ] tetrahedron. Oxygen bond valence was one of crucial parameters for modulating the temperature coefficient of resonant frequency (τ f ). Interestingly, the BaW 0.75 Mo 0.25 O 4 ceramic sintered at 910 °C exhibited favorable microwave dielectric properties of ε r = 9.44, Q × f = 46,820 GHz (@12.5 GHz), and τ f = −69.2 ppm/°C. Meanwhile, the BaW 0.75 Mo 0.25 O 4 ceramic had stupendous dielectric properties in low-frequency band: ε r = 17.5 and dielectric loss (tan δ ) = 2.2×10 −4 (@10 MHz). In addition, there was good chemical compatibility between BaW 0.75 Mo 0.25 O 4 ceramic and silver electrodes. These findings evidence that BaW 1- x Mo x O 4 ceramics are competitive candidates in LTCC technology.
研究领域:
材料科学
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电子材料
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DOI
高影响因子
ACS Applied Nano Materials
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2018
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IF 0
Mu Gao,Xiaofeng Lu,Sihui Chen,Di Tian,Yun Zhu,Ce Wang
Doping with transition metal ions has been regarded as one of the most effective means to optimize the catalytic efficiency of metal oxides. In this work, a general approach for the fabrication of Mo6+-doped Co3O4 (Mo–Co3O4) nanotubes for peroxidase mimicking has been demonstrated via an electrospinning method combined with a calcination process. The prepared Mo–Co3O4 nanotubes exhibited a higher peroxidase-like catalytic activity than pure Co3O4 nanotubes, and the highest catalytic activity is achieved when the molar fraction of Mo is 2.0%. The catalytic kinetic of Mo–Co3O4 nanotubes follows a typical Michaelis–Menten mechanism, representing a strong affinity to H2O2 and 3,3′,5,5′-tetramethylbenzidine (TMB) substrates. Because of the high catalytic efficiency of the Mo–Co3O4 nanotubes, we have developed a facile and efficient strategy for the sensitive colorimetric determination of l-cysteine with a low detection limit of 24.2 nM. This detection limit is superior to many previous reported enzyme-like detection systems. Furthermore, a favorable selectivity toward the determination of l-cysteine based on this approach is also achieved, showing bright prospects in environmental monitoring and biomedical analysis.
研究领域:
材料科学
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生物医学工程
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分析化学
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DOI
Nano Today
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2023
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IF 17.4
Jinfu Wu,Jingge Ma,Hui Zhuang,Hongshi Ma,Chengtie Wu
The regeneration of hair follicles in skin defect area remains a huge challenge all over the world. However, there is no effective strategy to solve this problem due to the difficulty of harvesting hair follicles in anagen period. Herein, we design a bioink based on calcium molybdate (CM) nanoparticles , laden with dermal papilla cells (DPCs) and macrophages. Interestingly, an anti-inflammatory microenvironment is established by the release of molybdenum (Mo) ions, thereby achieving favorable immunomodulation of bioactive ions-mediated hair regrowth . It is demonstrated that in the CM nanoparticles-containing multicellular bioinks, Mo polarizes macrophages into M2 phenotype to secret anti-inflammatory cytokines. Furthermore, it is shown that the anti-inflammatory immune microenvironment of the scaffolds induces the secretion of hair follicle anagen-related cytokines in DPCs, promoting hair regrowth in vivo. Finally, transcriptomic analysis reveals the underlying mechanism that Mo activates the mammalian target of rapamycin (mTOR) signaling pathway in macrophages and up-regulates the expression of growth factors (HGF and IGF-1), which accelerate the transition of hair follicles to anagen period. This study offers a new insight and strategy for the reconstruction of complex skin appendages through bioprinting immunomodulatory multicellular scaffolds with inorganic bioinks.
研究领域:
生物医学工程
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组织工程
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再生医学
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免疫学
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纳米技术
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产品关联
DOI
高影响因子
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