ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Renjie Ding,Haifeng Zhu,Jiashun Zhou,Huihua Luo,Kehui Xue,Lianqing Yu,Yaping Zhang
Developing highly water-stable zeolitic imidazolate frameworks (ZIFs) for visible-light-driven photocatalytic hydrolysis is important and challenging. Herein, the Type II heterojunction catalyst Mn0.5Cd0.5S@ZIF-8 and its derivatives (including MCS@ZIF-8-Mn, MCS@ZIF-8-Br, and MCS@ZIF-8-MB) were successfully constructed using a facile strategy. Through dual postsynthetic ligand and cation exchange (PSE) treatments of Mn(Ac)2·4H2O and 4-bromo-1H-imidazole for ZIF-8, the hydrogen production efficiency of the MCS@ZIF-8-MB heterojunction catalyst can reach 5.450 mmol·g–1·h–1 and remain at 97.11% after 9 h of the stability test. Construction of heterojunctions can effectively improve the hydrogen production performance of Mn0.5Cd0.5S while maintaining excellent water stability. X-ray photoelectron spectroscopy results show that upon successful construction of the MCS@ZIF-8-MB heterojunction an interface forms between the surface of MCS and ZIF-8-MB, effectively weakening the photocorrosion of MCS. Density functional theory calculations also indicate that the induction of Mn can increase the electronic states of p and d orbitals near the Fermi level of ZIF-8, suggesting that Mn(II) attracts more electrons than Zn(II). This provides more powerful theoretical evidence for the electron cloud shift from the electron donor S2– to Mn2+.
研究领域:
材料科学
·
化学工程
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Guochen Xia,Shixu Yu,Zezhou Yang,Jingyi Lian,Yimin Xie,Qinghua Feng
Natural wood has been highly valued for thousands of years due to its excellent strength, low density, and ease of processing. However, its poor water stability, which leads to swelling and deformation, limits its competitiveness. In response, we designed a reconstructed wood through a process involving pretreatment, TEMPO oxidation, lignin self-assembly, lignin melting, and densification. In this material, cellulose serves as the skeleton, while lignin with a phenylpropyl structure acts as both a filler and binder. The resulting wood exhibits outstanding water stability, with no changes after 60 days of water immersion and a water absorption rate as low as 8.32 %. This stability is achieved through the densification of lignin, which is enhanced by lignin melting and pressure during self-assembly. The reconstructed wood not only offers excellent water stability but also boasts superior UV resistance and thermal stability. Additionally, it can be hot-pressed into straws within a mold, providing better water stability and tensile strength compared to paper straws. This reconstructed wood, made from natural wood and corncob, is biodegradable and environmentally friendly, offering a new approach to wood water stability strategies.
研究领域:
材料科学
·
林业科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
De-Yun Ma,Si-Yun Zhang,Si-Hui Zhan,Li-Ting Feng,Shi-Gong Zeng,Qia-Quan Lin,Yong Pan
Nowadays, water pollution caused by diverse poisonous compounds, particularly hydroxy aromatic compounds and their derivatives, has become a prominent environmental issue because of the possible toxicity to human beings. This research adopted an adsorptive method to remove catechol using a water-stable hydroxyl-functionalized terbium–organic framework for the first time. The as-synthesized new metal–organic framework (Tb–MOF) shows favorable thermostability and water stability based on results of thermogravimetric analyses, water vapor sorption, and powder X-ray diffraction. Along the c axis, Tb–MOF has a three-dimensional framework with channels of 8.4 × 8.1 Å2 as well as high adsorption capacity with the maximal adsorption capacities of 260 mg/g for catechol than that of any reported adsorbent so far. Thermodynamics, adsorption kinetics, effects of pH, and effects of temperature were investigated in a batch reactor. The remarkably high adsorption capacity of Tb–MOF could be explained by the appropriate pore diameter of Tb–MOF in addition to the hydrogen bonding interplay of catechol molecules with Tb–MOF. In a breakthrough adsorption process of the Tb–MOF packed column, the adsorption breakthrough curve of a fixed bed for the catechol was found to favorably fit with the Thomas model. Because of its excellent catechol adsorption performance, the obtained Tb–MOF can be considered as a promising and suitable candidate as a high-performance catechol adsorber.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2022
·
IF 5.876
Xiuxuan Fang,Yingzhi Zhu,Haotian Dong,Na Ma,Wei Dai
In view of unstable Cu-BTC could be destroyed by water molecules, causing a significantly performance decrease of adsorptive desulfurization, a (MOF-818)-on-(Cu-BTC) composite was innovatively designed and synthesized to achieve win-win for enhancing abilities of water-stability and desulfurization in this work. We approved that the novel (MOF-818)-on-(Cu-BTC) desulfurizer was achieved through nitrogen adsorption-desorption, powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS), etc. Thiophene (Th), benzothiophene (BT), and dibenzothiophene (DBT) capture performances from different simulated fuels in presence of moisture were systematic evaluated by means of batch tests. Further investigations demonstrated that the (MOF-818)-on-(Cu-BTC) exhibited remarkably sulfur capture ability, attributing to associative effects of specific surface area, nanopores , and acid-base interaction. Importantly, this (MOF-818)-on-(Cu-BTC) impressively retained sulfur capacity and its structural integrity even soaked in water for 7 days. Water-resistant ability was accordance with the order: (MOF-818)-on-(Cu-BTC)＞MOF-818＞Cu-BTC. This novel work would provide a new idea for adsorptive desulfurization by MOF-on-MOF in the presence of water environment.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
INORGANICA CHIMICA ACTA
·
2018
·
IF 2.264
Yang Zhang,Jian Wang
A water-stable 2D Zn-based MOF with chemical formulae [(Me 2 NH 2 ) 4 Zn 2 (FDC) 4 ] n ( 1 ) (FDC = 2,5-furandicarboxylate) was synthesized and structurally characterized. TGA and PXRD results show high thermal and water stability for 1 . 1 exhibits a 2D (4,4) net with 1D channel of 7.2 × 7.2 Å 2 along the c axis. Desolvated 1 adsorbs around 11.4 wt% 5-Fluorouracil and the cumulative release value of 5-Fluorouracil at 48 h was about 96.5% and 99% in PBS (pH = 7.4 and pH = 6.0) at 37 °C, respectively. The in vivo Zebrafish toxicity tests and in vitro MTT assays of 1 at different concentrations results reveal that 1 is nontoxic.
研究领域:
材料科学
·
药学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2024
·
IF 3.3
Fan Su,Zhiyue Liu,Jieyi Yuan,Li Hou,Tongyi Liang,Yifei Wang,Qinfang Zhang,Yong Dai,Shuhong Cao,Jingwen Chen
Mn 4+ -activated fluoride phosphors are promising luminescent materials for use in phosphor-converted white-light-emitting diodes (wLEDs). However, poor water resistance in high humidity environment, one of critical drawbacks of this type of phosphors, has limited their practical applications. To address this issue, we developed a new facile strategy to passivate the surface of phosphors by in situ constructing a dual Mn 4+ -rare protective layer using well-known aminocarboxyl complexants with mild reducibility and strong complexation property. Ethylenediamine tetraacetic acid (EDTA) was taken as a representative for the research in detail, and a typical Mn 4+ -doped fluorosilicate phosphor K 2 SiF 6 :Mn 4+ (KSFM) was selected to demonstrate the reliability of the proposed strategy. The surface passivation was achieved by simply dispersing KSFM in a saturated EDTA aqueous solution (KSFM-sEDTA) or a hydrofluoric acid solution containing a certain amount of EDTA (KSFM-EDTA), and then stirring for a short time at room temperature. The analysis results indicate that the dual Mn 4+ -rare surface layer is composed of a K 2 SiF 6 matrix shell and an organic coating of residual EDTA and/or its related compounds, and the layer constructed by Method 2 is more significant than that by Method 1. Both the luminescence performance and the water resistance of the passivated KSFM were greatly enhanced while the luminescence characteristics remained unchanged. When the water-eroded KSFM was re-treated with EDTA, the luminescence was dramatically restored due to removal of the manganese hydrolysates and repair of the crystal surface defects. The wLEDs assembled with KSFM-EDTA and KSFM-sEDTA phosphor exhibited intense white light with high luminous efficiency (LE, 170.61 lm/W and 162.51 lm/W), high color rendering index (CRI, 88.3 and 85.9), and low correlated color temperature (CCT, 3680 K and 3805 K), respectively. More importantly, the fabricated wLEDs retained high LE (90.6% and 88.6%) and no remarkable changes of CRI and CCT values after being aged at high temperature and humidity (85 °C, 85%) for 550 h, which are more superior to the wLED assembled with the pristine KSFM.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
Small Structures
·
2024
·
IF 13.9
Qile Li,Shuochen Fan,Xiaodong Luan,Ke Xu,Xianqi Wei,Qinlin Shao,Huaping Peng,Linxing Shi
All-inorganic perovskite CsPbBr 3 (CPB) nanocrystals (NCs) are not widely applied in aqueous environments due to their readily decomposable nature. Therefore, the aqueous-phase preparation of CPB NCs has been a considerable challenge. In this work, a feasible method is proposed for preparing aqueous-phase core–shell CPB nanorods (NRs) encapsulated with polydopamine (PDA) by employing a multifunctional additive cesium trifluoroacetate (Cs-TFA). Highly luminescent TFA-CPB NRs are obtained via a chemical transformation of Cs 4 PbBr 6 NCs in water. Subsequently, PDA constitutes a robust shell on the surface of TFA-CPB NRs through the covalent oxidative polymerization, which effectively reduces the original dynamic properties of surface ligands, retards the decomposition of ligands and inhibits the leakage of Pb 2+ ions. The results demonstrate that the fluorescence intensity of TFA-CPB@PDA NRs maintains 49.3% of the initial intensity after 136 days. Meanwhile, the NRs exhibit low cytotoxicity, and the cell viability remains at 80% when the concentration of the NRs is 200 μg mL −1 . The reliable preparation of aqueous-phase core–shell perovskite NRs (PNRs) will facilitate their development in many fields, such as materials science, biology, medicine, and their applications in aqueous environments.
研究领域:
材料科学
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生物学
·
医学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Mengmeng Zhang,Kun Yang,Junshuo Cui,Haibiao Yu,Yuejiao Wang,Weijun Shan,Zhenning Lou,Ying Xiong
With the ever-increasing of Rare Earth Elements (REEs) in various high technology applications, efficient recovery of REEs from liquid sources is becoming significantly important. In this work, ZIF-8 and UiO-66-NH 2 (U6N) are combined to form a 3D-agaric like core-shell structure hybrid material (U6N@ZIF-8-20), which exhibits good performance in REEs extraction. Due to the abundant adsorption sites of ZIF-8 and the excellent water stability of UiO-66-NH 2 , 3D-agaric like U6N@ZIF-8-20 showed quick adsorption rate (only 10 min to reach equilibrium), high adsorption capacity and selectivity for REEs from water compared to other reported adsorbents. Maximum adsorption capacities of U6N@ZIF-8-20 for neodymium (Nd(III)), europium (Eu(III)), gadolinium (Gd(III)) and erbium (Er(III)) achieved to 249.90, 295.28, 316.22 and 340.95 mg g -1 , respectively. U6N@ZIF-8-20 has superiority in selective adsorption of REEs from Cd(II), Zn(II), Cu(II), Mn(II) and Co(II) coexistence solution. The order of adsorption capacities for REEs is in agreement with the order of their electronegativity, ionic radius and charge density. Moreover, U6N@ZIF-8-20 showed better water stability and recyclability than single MOF. Overall, MOF@MOF hybrid material has efficiency in REEs separation from solutions, and has great advantage in the application of wastewater treating.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Chongchong Chen,Hexiang Gao,Hui Li,Mingchao Wang,Jie Zhang,Tengfei Li,Wenjia Wu,Zhirong Yang,Jingtao Wang
The poor water-stability and cross-layer proton transfer property pose a challenge to the lamellar metal–organic frameworks (MOFs) membrane when acting as a promising proton exchange membrane. Herein, we report an adipic acid-mediated strategy to improve the water-stability and the cross-layer proton conductivity of CuTCPP lamellar MOF membrane, which achieves a maximum power density and current density of 112.6 mW cm −2 and 424.4 mA cm −2 , respectively. Adipic acid with extra functional groups (–PO 3 H 2 , –COOH) stably bridges the adjacent crystal layers via the terminal carboxylic acid anchoring Cu sites. In particular, the extra functional groups introduced into the adipic acid regulate the allocation of hydrogen bonding networks in an umbrella-shape around adipic acid with copper-porphyrin structures as external margin, enriching the coherence of hydrogen bonding network on the proton transport path. Benefiting from the regular pore structure of MOF, the optimized hydrogen bonding networks in adjacent crystal layers construct a more abundant through-plane transfer pathway. The resultant through-plane proton conductivities of CuTCPP-PO 3 H 2 /–COOH membranes are up to 108/89 mS cm −1 at 80 °C and 100 % RH, which is ∼ 6-fold higher than that of the pristine CuTCPP membrane (13 mS cm −1 ), with a conductivity attenuation of < 5 % during a humidity cycling test for 12 times.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2024
·Vol. 16
·期 6
·797
·
IF 4.7
Zixuan Yang,Xin Meng,Guangda Zeng,Jinguang Wei,Chuangui Wang,Wenji Yu
Bamboo scrimber is acknowledged for its eco-friendly potential as a structural material. Its properties are significantly affected by both its density and resin content, but the effect of resin content on the properties under high density is not yet known. In this study, the microstructure, water resistance, mechanical properties, and thermal stability of bamboo scrimbers with varying resin content at a density of 1.30 g/cm3were investigated. The results unearthed that phenolic resin assisted in the densification of bamboo cells during hot pressing, and a higher resin content could effectively reduce the cracks in the scrimber. The inherent cellulose I structure remained unaffected, but an increase in resin content led to a noticeable decline in crystallinity. Additionally, an increase in resin content pronouncedly improved the water resistance and dimensional stability of bamboo scrimbers. The water absorption and thickness swelling were as low as 9.67% and 7.62%, respectively. The modulus of rupture (MOR) exhibited a marginal increase with the amount of resin, whereas the compressive strength and short-beam shearing strength first increased and then decreased. Their peak strengths were 327.87 MPa at a resin content of 15 wt.%, and 168.85 MPa and 25.96 MPa at 11 wt.%, respectively. However, phenolic resin accelerated the thermal decomposition of bamboo scrimbers, and more resin worsened the thermal stability. These research outcomes offer a dual advantage, providing both a theoretical foundation and concrete data that can inform the production and practical application of high-density bamboo scrimbers.
研究领域:
材料科学
·
林产化学加工工程
✓ 已验证
DOI
PubMed
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2022
·
IF 7.305
Wei Wang,Zhengzhao Yang,Jiaxin Ding,Jiaqi Kong,Xin Li
Inverted flexible perovskite solar cells (FPSCs) offer a promising route towards commercialization by using undoped inorganic hole transport layers and thermally-stable electron transport layers (ETLs), which deliver good environmental stability such as water resistance. But the power-conversion-efficiencies (PCEs) of inverted flexible perovskite cells are still far below those of FPSCs in regular configuration so far. One main challenge for achieving high-performance FPSCs lies in optimizing the ETLs and their adjacent buffering layers. Herein, we modify the fullerene derivatives (Phenyl-C61-butyric acid methyl ester , PCBM) ETLs by adding 3-aminopropyl triethoxysilane (APTS) molecules into the PCBM solutions. The addition of APTS results in smoother and denser PCBM layers via a physically steric-hindrance effect mechanism, which could benefit the electron collection between the PCBM layer and the perovskite layer. More importantly, APTS can offer nucleating sites, such as amine groups or hydroxy groups by partially hydrolyzing, to grow conformal tin oxide (SnO x ) layers by atomic layer deposition (ALD), which acts as robust buffer layers to replace traditional bathocuproine (BCP) layer. Finally, high-performance inverted FPSCs based on the optimized PCBM/SnO x electron-selective layers are fabricated, delivering a best PCE of 18.62%. The unencapsulated FPSC showed a slow decay and remained above 90% of its initial PCE after being stored for more than 600 h in a damp environment with a humidity of more than 85% R.H. The strategy is demonstrated to be applicable in the future large-scale production of stable FPSCs.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Shanshan Xu,Hongliang Huang,Xiangyu Guo,Zhihua Qiao,Chongli Zhong
Application of metal-organic frameworks (MOFs) in the field of gas separation has been widely explored, however most of the reported MOFs are sensitive to hydrolysis, restricting their applications under practical environments. In this work, Cu-BTC with distinguishing high resistance to hydrolysis was prepared through in-situ functionalization with sodium citrate (SC). The obtained Cu-BTC-SC can hold its structure integrity and preserve its original gas adsorption capacity even after 10 days' immersion in water. On this basis, mixed matrix membranes (MMMs) containing different loadings of Cu-BTC-SC in Pebax® 1657 were fabricated and applied for CO 2 /N 2 and CO 2 /CH 4 separation under humid conditions. The MMMs displayed excellent long-term stability towards humidified test conditions as well as improved CO 2 separation performance compared with the pristine Pebax® 1657 membrane. Specifically, the membrane incorporated with 15 wt% of Cu-BTC-SC demonstrated a CO 2 permeance of 1102.5 GPU together with a CO 2 /N 2 selectivity of 54.8 for the CO 2 /N 2 mixed gas, and a CO 2 permeance of 1069.6 GPU together with a CO 2 /CH 4 selectivity of 32.5 for the CO 2 /CH 4 mixed gas, surpassing the Robeson upper bounds for CO 2 /N 2 and CO 2 /CH 4 separation. These results demonstrate a potential effective strategy for improving the water stability of MOFs and suggest a promising candidate for the fabrication of high performance membranes for practical large-scale CO 2 separation applications.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）