APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Mimi Sun,Jiahui He,Wanting Xiang,Wei Zou,Wenfei Song,Yating Xi,Jun Yan,Meimei Zhou,Pingping Luo
The design and construction of diverse heterojunction architectures have emerged as an effective strategy for enhancing the photocatalytic performance of semiconductors. In this study, ZIF-8/TiO 2 composite nanofibers were successfully fabricated by combining electrospinning technology with a facile in-situ solvothermal method, followed by ZIF-8 sulfurization to form ZnS/TiO 2 nanofiber heterostructures. Comprehensive characterization confirmed that ZIF-8 on the surface of TiO 2 nanofibers was completely converted into ZnS, establishing a robust and intimate interface with TiO 2 . The resulting ZnS/TiO 2 heterojunction exhibited remarkable photocatalytic reduction activity for Cr(VI), achieving 100% removal efficiency within 20 min under visible light irradiation. The photocatalytic reaction rate constant of the ZnS@TiO 2 nanofibers was approximately 10 and 319.5 times higher than those of pristine ZnS and TiO 2 nanofibers, respectively. This enhanced photocatalytic performance is attributed to the formation of the heterojunction, which effectively narrows the bandgap of the composite, optimizes photogenerated charge transfer pathways and significantly improves electron-hole pairs separation. Furthermore, mechanistic studies identified photogenerated electrons (e − ) and superoxide radicals ( O 2 − ) as the dominant active species involved in the photocatalytic reduction process. This work provides both fundamental understanding and practical methodology for developing high-performance TiO 2 -based photocatalytic systems, highlighting their potential for advanced water purification technologies.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2014
·
IF 6.007
Hongmei Dai,Bingquan Xia,Lan Wen,Cheng Du,Jun Su,Wei Luo,Gongzhen Cheng
Highly dispersed bimetallic AgPd nanoparticles with different composition have been successfully deposited on the metal-organic frameworks (ZIF-8) by using a simple liquid impregnation method. The resultant catalysts are composition dependent toward dehydrogenation of formic acid, while Ag 18 Pd 82 @ZIF-8 exhibits exceedingly high catalytic activity, with the turnover frequency (TOF) value of 580 h −1 , and 100% hydrogen selectivity at 80 °C.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ENVIRONMENTAL RADIOACTIVITY
·
2022
·
IF 2.655
Sheng Liu,Yiyang Zeng,Ai Zhang,Yuxin Song,Yuran Ni,Jiamao Li,Fangting Chi,Chengjian Xiao
Due to the rapid diffusion of radioactive iodine, the demand for safe and efficient capture and storage of radioactive iodine is increasing worldwide. The use of porous carbon materials to capture iodine has aroused great interest. This work prepared porous carbon materials derived from polymetallic oxides of the zeolitic imidazolate framework (ZIF) by pyrolysis at 1000 °C. The carbon materials (CZIF-1000) have a high specific surface area of about 1110 m 2 /g and a total pore volume of 0.92 cm 3 /g. Adsorption studies have shown that the CZIF-1000 had significant adsorption performance for iodine, and the adsorption capacity can reach 790.8 mg/g at 8h. The potential mechanism of adsorption is that the carbonization causes the charge-transfer interaction and pore size distribution. Compared with the conventional adsorbents, the adsorbents showed faster kinetics and high extraction capacity for iodine. This experiment provides an effective method for designing a highly efficient adsorbent for iodine and broadens the ideas for developing new iodine extraction adsorbents.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Yongjiang Shan,Mingliang He,Fei Zhang,Yifei Wang,Yuxin Liu,Yingdong Yang,Xingqian Wang,Xinkang Zhang,Yuqin Li,Zhipeng Wang,Xiangshu Chen
Well-intergrown MOF membranes were challenging to construct using the in-situ approach, due to the poor heterogeneous nucleation of MOF on the supports. Here, we described a technique to manufacture ZIF-8 membranes devoid of induced seeds using support modified by O 2 plasma for the first time. O 2 plasma can increase the number of oxygen-containing functional groups (–OH) on the support surface that could absorb zinc ions from synthesizing solution and offer heterogeneous nucleation sites for the formation of ZIF-8 membranes. The as-synthesized membrane exhibits outstanding gas permeation performance with a high hydrogen permeance of about 2.22 × 10 −7 mol·m −2 ·s −1 ·Pa −1 and a high H 2 /CH 4 ideal selectivity of 25.91. The separation factor of the equimolar H 2 /CO 2 and H 2 /CH 4 mixtures reached 8.72 and 31.03 at 298 K and 0.1 MPa, respectively. In addition, this new technique also allowed for the synthesis of ZIF-67 membranes, and the prepared membrane had an H 2 /CH 4 ideal selectivity of 14.92. This work develops a new route for the efficient fabrication of MOF membranes.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2021
·Vol. 23
·期 24
·4327-4335
·
IF 3.545
Mei-Hua Chen,Qian-Ying Lu,Yi-Ming Li,Ming-Ming Chu,Xue-Bo Cao
ZnO semiconductors have been widely used as photocatalysts. However, the weak photodegradation under solar light restrains their further application. In this study, porous zeolitic imidazolate framework-8 (ZIF-8), which has a high specific surface, was combined with ZnO nanorods to fabricate ZnO@ZIF-8 core–shell heterostructures, with the ZnO nanorods and ZIF-8 as the core and the shell, respectively. Scanning electron microscopy and transmission electron microscopy measurements revealed that the ZnO nanorods were wrapped by a ZIF-8 shell. The pore size distribution of these ZnO@ZIF-8 nanocomposites included micropores, mesopores, and macropores. Moreover, a Brunauer–Emmett–Teller analysis showed an increase compared with the ZnO nanorods in the overall specific surface area. Due to a synergistic effect of ZnO and ZIF-8, the as-synthesized ZnO@ZIF-8 heterostructures exhibited high photocatalytic activity and completely degraded methylene blue in ∼4.5 min under solar light irradiation. Furthermore, stability experiments proved that the as-prepared ZnO@ZIF-8 nanocomposites retain over 95% of their photocatalytic activity after four cycles.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
·
2024
·Vol. 27
·期 32
·e202400241
·
IF 2.2
Donglin Jiang,Yuchen Zhou,Mengfan Du,Zezhi Chen,Huijuan Gong
Graphical The modification of ZIF-8 with dopamine results in a large amount of hydrophilic and CO 2 friendly groups introducing into the ZIF-8 molecules, and the structure and specific surface area of ZIF-8 is also improved. These factors lead to an improvement performance of ZIF-8 in the catalytic CO 2 absorption in water and alkaline solutions. CO 2 capture technology has been widely used to reduce CO 2 emissions, resulting in a variety of capture methods and materials. Among them, the more widely used is the chemical absorption method. However, the chemical absorption method has problems such as high energy consumption and slow absorption rate. In order to solve the above problems, we prepared an effective catalyst to improve the CO 2 absorption rate. ZIF-8 and hydrophilic ZIF-8-DA were prepared by in situ synthesis under ambient conditions. The catalytic effect of the hydration reaction of ZIF-8 and ZIF-8-DA was tested using CO 2 absorption regeneration experiments under aqueous and alkaline conditions, respectively. The results showed that the synthesized catalysts could significantly enhance the CO 2 absorption in water and alkaline solution. The addition of 0.1 wt % of ZIF-8 in alkaline solution increased the average CO 2 absorption by 1.80–15.84 %, respectively, while the addition of 0.1 wt % of ZIF-8-DA increased the CO 2 absorption by 7.01–25.36 %. In addition, both catalysts had excellent reusability and maintained high performance even after five absorption and regeneration cycles. Polymer dispersibility index (PDI) results showed that ZIF-8-DA dispersed more uniformly in aqueous solution.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Qiao Tian,Xiaohua Jia,Jin Yang,Sizhe Wang,Yong Li,Dan Shao,Haojie Song
ZIF-8, a novel lubricant additive, is considered to have great potential in reducing friction and wear due to large specific surface area, thermal stability and mechanical flexibility. However, ZIF-8 nanoparticles readily hydrolyze in aqueous solutions, transforming into large-sized lamellar and rod-like materials, which is a major bottleneck as a water-based lubricant additive. Herein, a strategy is proposed to functionalize ZIF-8 via mussel-inspired polydopamine (PDA) polymerization process to improve its lubrication stability in the water phase. The modified ZIF-8 (PDA@ZIF-8) can firmly “locked” water molecules on the surface of PDA to protect internal structure of ZIF-8, and improve its dispersion and stability of ZIF-8 in water. Moreover, ZIF-8@PDA tribofilm and iron oxide chemical protection film are formed during the friction process, and the low shear strength water layer between the contact surfaces contribute to achieving powerful synergistic lubricating effects, resulting in friction coefficient and wear track width reduce by 65% and 66%, respectively. Therefore, this work provides a promising alternative for expanding the practical application of ZIF-8 in aqueous environment and tribology.
研究领域:
材料科学
·
摩擦学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Shiyang Li,Chenchen Zheng,Longdou Tu,Dajian Cai,Yangxiang Huang,Congjie Gao,Yeqiang Lu,Lixin Xue
Tight ultra-filtration (TUF) membranes were constructed by in situ growing zinc imidazole frameworks micro-crystalline leaves (ZIF-L) in polyethylene imine (PEI) and polydopamine (PDA) deposit layers on porous polyethylene (PE) substrates. The effects of preparation conditions on the surface physical and chemical structures as well as on the dye/salt separation performance of the formed TUF membranes were systematically investigated. By inserting selective water permeation channels and increasing contacting surface areas, in situ-grown ZIF-L arrays tightly cross-linked in the coating matrix greatly increased water permeation without trading off dye/salt retention selectivity. The morphology of the included ZIF-L particles could be varied by adjusting the ligand/Zn molar ratio (α) in the preparation processes. Optimized PDA-PEI/ZIF-L@PE TUF membranes containing ZIF-L of cross-cross block morphology showed very high pure water permeability of 180 ± 20 L·m −2 ·h −1 ·bar −1 (LMHB) and retention selectivity (S CR/Na2SO4 and S MB/Na2SO4 ) of 267 and 43, respectively, as well as excellent stability and anti-fouling properties.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Xiaoxia Ye,Zhihong Zheng,Jinwei Zhu,Jie Chen,Jianfei Zhou,Bi Shi
Adsorptive removal of mercury ion from wastewater has become a hot topic due to the toxicity and persistence; acquiring adsorbent materials with high-capacity, rapid-kinetic, super-selective while low-cost features are highly demanded. Herein, based on the full functionality of collagen fiber (CF) from the leather waste, we proposed an innovative synthetic approach through exploiting amino-functionalized ZIF-7 (ZIF-7-NH 2 ) as functional groups to facilely in-situ incorporate with CF, affording low-cost but effective adsorbent materials of CF/ZIF-7-NH 2 composite maximizing both functions of CF and ZIF-7-NH 2 in the Hg(II) capture. Remarkably, it exhibits an ultra-high capacity as high as 909.09 mg g - 1 , fast kinetics that could remove 99.01 % of 200 mg·L -1 within 20 min, and significant selectivity of S Hg/M ( K d Hg / K d M ) as large as 522–1017 over Mg 2+ , K + , Ca 2+ , Cd 2+ , and Mn 2+ . We understand such an impressive adsorption is contributed by the synergistic action between functional groups including on the CF and ZIF-7-NH 2 . This study offers an effective method for removing heavy metal ions, achieving efficient removal of Hg(II) ions for pollution control, and promoting the reuse of waste CF to reduce waste accumulation in various aspects.
研究领域:
环境科学
·
材料科学
·
生物学
✓ 已验证
产品关联
DOI
高影响因子
ADSORPTION SCIENCE & TECHNOLOGY
·
2022
·
IF 4.373
Zhijuan Zhang,Pengwei Li,Ting Zhao,Yuanhan Xia
The ZIF-8 crystals were successfully postsynthetically modified using methylamine (MA), ethylenediamine (ED), and N, N-dimethylethylenediamine (MMEN) to improve their adsorption performance toward CO2. Results showed that, compared with the original ZIF-8, the BET specific surface area of MA-ZIF-8, MMEN-ZIF-8, and ED-ZIF-8 has increased by 118.2%, 92.0%, and 29.8%, respectively. In addition, their total pore volume increased separately by 130.8%, 100%, and 48.7%. The adsorption capacities of CO2 on the amine-modified ZIF-8 samples followed the order . The CO2 adsorption capacities at 298 K on MA-ZIF-8, MMEN-ZIF-8, and ED-ZIF-8 were increased by 118.2%, 90.2%, and 29.8%, respectively. What is more, the CO2/N2 selectivities calculated using an IAST model of the amine@ZIF-8 samples at 0.01 bar and 298 K were also significantly improved and followed the order , which increased by 173.0%, 121.4%, and 22.6%, respectively. The isosteric heat of CO2 adsorption () on the MA-ZIF-8, MMEN-ZIF-8, and ED-ZIF-8 all becomes higher, while of N2 on these samples was slightly lower in comparison with that on the ZIF-8. Furthermore, after six recycle runs of gravimetric CO2 adsorption-desorption on MA-ZIF-8, the adsorption performance of CO2 is still very good, indicating that the MA-ZIF-8 sample has good regeneration performance and can be applied into industrial CO2 adsorption and separation.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Weibin Chen,Changshui Wang,Shibiao Su,Hai Wang,Dandan Cai
The quest for desirable two-dimensional (2D) materials and facile strategies to construct 2D layered composites with fascinating structures and compositions for high-performance electrocatalysis is still a major challenge. In the present research, novel nanocomposites of 2D zeolitic imidazolate framework-9 (ZIF-9) combined with Co-layered double hydroxide (Co LDH) were successfully synthetized through a controllable phase transition from ZIF-9(I). The 3D to 2D structural transformation of ZIF-9 was induced by deionized water, and the formation of 2D Co LDH was simultaneously realized during the one-step fabrication of ZIF-9(III)/Co LDH nanocomposites. Due to the high surface area, the presence of abundant metal sites, and the interactions between 2D ZIF-9(III) and 2D Co LDH, the as-optimized ZIF-9(III)/Co LDH nanocomposite exhibits great electrochemical activities for oxygen evolution reaction (OER) (η = 297 mV at 10 mA cm −2 ) in 1.0 M KOH solution. The electrochemical performance of the ZIF-9(III)/Co LDH nanocomposite was superior to those of the pure Co LDH, ZIF-9(III), and commercial RuO 2 . The present work demonstrates that the proposed strategy can effectively boost catalytic activities and also design new routes to synthesize advanced MOF nanohybrids for various applications.
研究领域:
材料科学
·
电化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Yun Wu,Jinwei Wang,Weiyi Zhang,Qiang Zhao,Jinping Li,Guang Liu
Highly efficient and economical oxygen evolution reaction (OER) electrocatalysts are instrumental in the utilization and storage of renewable sources. Here, we introduce a straightforward method for the in situ growth of sulfur-doped iron oxide (S-FeO x ) and two-dimensional (2D) zeolitic imidazole framework-67 (ZIF-67) nanoarrays on three-dimensional (3D) nickel foam (NF), yielding a 3D S-FeO x /ZIF-67/NF electrocatalyst. The distinctive sheet-like structure and porous framework of S-FeO x /ZIF-67/NF significantly increase the electrochemical active surface area. The prepared S-FeO x /ZIF-67/NF exhibits outstanding electrocatalytic OER activity, achieving a remarkably low overpotential of 236 mV at a current density of 100 mA/cm 2 . Furthermore, S-FeO x /ZIF-67/NF demonstrates the capability to deliver industrial-level large current densities, requiring overpotentials of merely 291 and 334 mV to attain current densities of 500 and 1000 mA/cm 2 , respectively. Moreover, it maintains stable operation for over 80 h at a current density of 1000 mA/cm 2 , with the sheet-like structure remaining intact and no significant activity decay observed. This investigation offers a strategic approach for the systematic development and fabrication of OER electrocatalysts suitable for large current conditions.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）