Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Lisha Yang,Jia Wen,Qi Wang,Hongsheng Cui
Metal-organic frameworks (MOFs) nanoparticles have been regarded as one of the most important materials for high-performance applications in various fields, including environmental protection. Understanding the migration behavior of MOFs in the environmental media is critical for evaluating their opportunities and risks. In this study, the effect of pH, ionic strength, and NOM (fulvic acid and citric acid) were selected to investigate the transport and retention of ZIF-8 in saturated porous media . Experimental results showed that the released Zn 2+ of ZIF-8 was significantly increased by the high concentration of ionic strength and citric acid . There were new ZIFs phases detected in the transport process. ZIF-8 had weak mobility with a recovery of transport mass ≈ 2.3% in 1 mg/L citric acid at pH 6, while the maximum effluent recovery was 33.7% in the 100 mM NaCl at pH 8. Under all examined conditions, ZIF-8 was mainly retained at segments near the column inlet. Straining increased the retention of ZIF-8 in porous media. These results indicated that physicochemical factors and particle-specific properties played important roles in influencing ZIF-8 transportability, which would lead to the more complex evaluation of the environmental behaviors of MOFs.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Xu Zhang,Fangzhi Liu,Lusheng Xu,Zehai Xu,Chong Shen,Guoliang Zhang,Qin Meng,Congjie Gao
In this study, heterostructured MOF/lamellar talc composites was successfully synthesized by in-situ growth of zeolitic imidazolate framework-8 (ZIF-8) nanoparticles on acidified black talc (ABT) and introduced into polydimethylsiloxane (PDMS) matrix to prepare high-performance mixed matrix membranes (MMMs) via spin coating and thermal cross-linking. The submicron-size natural lamellar black talc (BT) was first explored as stable carrier to synthesize laminated composite with continuous MOF phase. Owing to its silica-oxygen tetrahedral structure, the resultant laminated composite presented good compatibility with PDMS matrix, avoiding the formation of interfacial defect between polymer and nanoparticles. Moreover, well-dispersed and continuous ZIF-8 nanoparticles on lamellar nanosheets had preferential adsorption effect for alcohol, enhancing the selectivity of membranes. The coupling effects of graphene-like lamellar structure from talc and sequential transport channels from ZIF-8 attributed to greatly enhance permeation flux. Various techniques such as FESEM, TEM, FTIR, XRD and EDS were applied to investigate the morphology and structure of composites and membranes, and pervaporation experiments were applied to probe the behavior of polymer-based composite membranes . High performance defect-free ZIF-8@ABT/PDMS MMMs exhibited excellent total permeate flux of 1711 g m −2 h −1 with very competitive separation factor of 41 for low concentration n-butanol recovery.
✓ 已验证
产品关联
DOI
高影响因子
BIOELECTROCHEMISTRY
·
2022
·
IF 5.76
Xianhua Shi,Yixuan Xie,Linxi Chen,Jing Lu,Luyong Zhang,Duanping Sun
Zeolitic imidazolate frameworks (ZIFs), a famous subfamily of metal-organic frameworks (MOFs), are considered promising electrocatalysts. Herein, ZIF-67 was selected as an electrocatalyst for designing electrochemical sensors due to having the best electrocatalytic activity in ZIFs. To overcome the insufficient electrocatalytic activity of ZIFs, ZIF-67 derivatives (QZIF-67-X, where X represents calcination time) were obtained by calcining at 250 °C for a certain time. The porous structure of the precursor in QZIF-67-X is maintained, exposing more active centers. QZIF-67-X could accelerate electron transfer and lead to improve the electrocatalytic performance. Moreover, QZIF-67-2 was chosen as an Au nanoparticle-supported nanocarrier to further bind G-quadruplex/hemin DNAzymes with strong catalytic activity due to the best supporting activity of QZIF-67-2 among QZIF-67-X. The synergistic catalysis of QZIF-67-2 and G-quadruplex/hemin DNAzymes effectively amplified the reduction current signal of H 2 O 2 . The linear range of the prepared electrochemical sensor was 2 μM-65 mM, and the detection limit was 1.2 μM. Moreover, the real-time detection of H 2 O 2 from HepG2 cells was achieved by the sensor, providing a novel technique for efficient anticancer drug evaluation. These results suggested that QZIF-67 can be utilized as an efficient electrocatalyst for improving the sensitivity of sensors.
✓ 已验证
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Rongtao Liu,Yiyu Pang,Tianhua Xiao,Shiyang Zhang,Yidong Liu,Yonggang Min
Polycaprolactone (PCL) nanofibers have become an ideal material for bone tissue engineering due to a series of advantages. Considering the clinical treatment of bone defects, in addition to meeting the golden standard, PCL based nanofibers also need to be multifunctional to anti-inflammatory, antibacterial properties, and enhance the bone regeneration and repair. Herein, we successfully developed the multifunctional PCL/LIG/ZIF-8 composite nanofibers by loading ZIF-8 on electrospun PCL/lignin (PCL/LIG) nanofibers. The prepared composite nanofibers exhibit fairly good wettability and acceptable degradation rate, as well as excellent antioxidative stress and antibacterial properties originating from the incorporated LIG and loaded ZIF-8. Moreover, owing to the synergistic effect of LIG and ZIF-8, the composite nanofibers present excellent osteogenic differentiation, which can be verified in biomineralization experiments and real-time quantitative polymerase chain reaction. These results indicate that the PCL/LIG/ZIF-8 composite nanofibers, as potential healthcare candidate, have a promising applied in the treatment of bone defects.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Water
·
2022
·Vol. 14
·期 14
·2248
·
IF 3.53
Guowei Pang,Min Ji,Zhuoran Li,Zhengwu Yang,Xiaojie Qiu,Yingxin Zhao
In this work, an efficient cage-core peroxymonosulfate (PMS) catalyst was synthesized by applying an electrospinning–calcination process to the cobalt–zeolitic imidazole framework (ZIF-67) crystals for the catalytic degradation of dimethyl phthalate (DMP). The morphology and surface properties of the synthesized materials (ZIF-67, Z600 and ZP400/600/800) were well characterized. ZP600 showed great performance for the catalytic degradation of DMP in the initial pH range of 7.5–10.5. The removal rate of DMP could reach 90.4% in 60 min under optimum dosages of reagents (catalyst = 0.1 g/L, PMS = 0.5 mM, DMP = 6 ppm), and the mineralization degree of contaminant could reach 65%. By quenching experiments, it was determined that sulfate radical (SO4−·) and hydroxyl radical (·OH) dominated the degradation process. Moreover, due to the good magnetism, ZP600 could be easily separated from liquid and showed great reusability in five-cycle reaction experiments. Surprisingly, with the cover of cage-like polyacrylonitrile (PAN) fibers, the cobalt leaching amount of ZP600 decreased by about 87%. This study would expand the application of the electrospinning process in the development of functional materials for water purification.Keywords:elctrospinning;ZIF-67;peroxymonosulfate;cobalt leaching control
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Xi Liu,Meili Ding,Pan Ma,Chengyuan Duan,Jianfeng Yao
Construction of macroscopic metal–organic frameworks (MOFs) with high processability is crucial for their practical usage. Here, we demonstrate a facile metal template-guided growth approach that exploits the synthesis of forest-like ZIF-8-based material. The 3D self-supported array architecture endows the resultant ZIF-8 forests with efficient exposure of active sites, rapid mass transfer and simple recovery. Under mild catalytic reaction conditions (1 bar CO 2 , 60 ℃), ZIF-8 forests show remarkable activities toward the coupling of epoxides and CO 2 with an excellent cyclic carbonate yield of 96%, surpassing the powdered ZIF-8 crystals. Importantly, the catalytic performance can be well-maintained even after 10 cycles and under both simulated flue gas conditions and full-spectrum light irradiation, demonstrating the potential for practical catalysis. Our work provides a practical guideline to produce macroscopic MOF-based materials with great potential for industrial catalysis.
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Xiaoyu Yang,Yanxia Liu,Dezhao Li,Jiayu Dong,Fengtao Chai,Baoyu Yang,Muhao Liu,Shuang Wang
PEO based solid electrolyte has high crystallinity, which seriously hinder the transport of lithium ions at room temperature, resulting in low ionic conductivity. In this paper, a high performance composite solid electrolyte membrane with LLZO@ZiF-67 as an inorganic filler and PEO as matrix was synthesized. The LLZO@ZiF-67 inorganic filler, which covered by in-situ synthesis of ZiF-67 layer on surface of LLZO, show a large specific surface area and a polyhedral structure. The introduction of LLZO@ZiF-67 effectively reduce the crystallinity of PEO, providing a continuous channel for the transport of lithium ions, which result in a ionic conductivity as high as 1 . 09 × 1 0 − 4 S cm −1 at room temperature of the composite electrolyte PLZ-20. Furthermore, the electrochemical stability and interface compatibility to lithium metal are improved. The lithium stripping/plating process at 0.1 mA cm −2 can maintain stable for more than 600 h without short circuit. In addition, the initial discharge capacity of the full battery (Li / PLZ-20 / LFP) can reach up to 141.1 mA h g −1 with retention of 91.45% after 100 cycles, which provide possibility for the application of high performance solid state battery.
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Rui Ding,Ziheng Li,Yan Dai,Xiangcun Li,Xuehua Ruan,Jiaming Gao,Wenji Zheng,Gaohong He
The amino functionalization of MOFs has been verified to be effective in improving the selective permeation of CO 2 . However, the introduction of amino groups into ZIF-8 by mixed ligands strategy is hard to achieve due to the high steric hindrance of benzene ring in 2-aminobenzimidazole ligand, resulting in insufficient content of amino groups. Therefore, in this work, polystyrene-acrylate (PSA) template is proposed to provide abundant adsorption and reaction sites for the rapid synthesis of NH 2 -ZIF-8 with high content of 2-aminobenzimidazole. Furthermore, the incomplete etching strategy is used to construct PSA modified hollow NH 2 -ZIF-8 nanospheres (PHNZ). Importantly, the thickness of PSA layer and the hollow size are adjusted by the etching time, as revealed by the SEM and TEM images. In this PHNZ, the modified PSA can provide good interface compatibility between PHNZ and Pebax matrix to enhance the CO 2 selectivity, while the hollow structure can reduce the mass transfer resistance and improve the gas permeability. Moreover, the introduced amino groups can enhance the CO 2 affinity of PHNZ and further improve the CO 2 /N 2 selectivity of the PHNZ-based mixed matrix membranes (MMMs). Benefiting from the synergy of good interface compatibility and enhanced CO 2 affinity from the amino groups, the PHNZ/Pebax MMMs present greatly improved CO 2 /N 2 selectivity in contrast with pure Pebax and NH 2 -ZIF-8 based membranes. Besides, as the etching time increases, the PHNZ-2 and PHNZ-3 based MMMs present a higher CO 2 permeability than that of NH 2 -ZIF-8 based MMM, revealing the significance of the hollow structure. The PHNZ-2/Pebax MMM with filler loading of 10 wt% expresses the best gas separation performance with the CO 2 permeability of 121.9 Barrer and CO 2 /N 2 selectivity of 96.6, respectively, showing an increase of 54.7 % and 98.0 % in contrast with pure Pebax membrane. Meanwhile, this CO 2 separation performance is far beyond the Robeson upper bound in 2008 and close to the McKeown upper bound in 2019, demonstrating that the proposed PHNZ displays a promising and competitive potential in MMM based CO 2 capture.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2022
·
IF 8.91
Xiaoying Jin,Heng Li,Xiuduan Zhu,Na Li,Gary Owens,Zuliang Chen
The integration of metal–organic frameworks with other functional materials has recently emerged as a promising approach for creating innovative materials for environmental remediation. Here, a nano-sized iron/nickel (Fe/Ni) functionalized zeolitic imidazolate framework-8 (ZIF-8-Fe/Ni) was fabricated for oxytetracycline (OTC) removal from wastewater. Cyclic voltammetry and amperometric I-t measurements indicated that OTC was degraded by ZIF-8-Fe/Ni. X-ray diffraction spectroscopy (XRD), transmission electron microscopy mapping (TEM-mapping) and X-ray photoelectron spectroscopy (XPS) indicated that Fe/Ni was evenly dispersed throughout ZIF-8 and partially oxidized after reaction with OTC. OTC adsorption isotherms and kinetics best fitted the Langmuir isotherm ( R 2 > 0.982) and pseudo-second-order model ( R 2 > 0.997), respectively. Reduction kinetics data followed the pseudo-first-order model ( R 2 > 0.905), where the apparent activation energy ( E a) was 22.9 kJ mol −1 , demonstrating that OTC degradation was mainly via a chemical process. The practical removal efficiency of OTC from real wastewater by ZIF-8-Fe/Ni was 92.6%, where even after application of ZIF-8-Fe/Ni for 5 consecutive removal cycles, a high OTC removal of 74.9% was maintained. Thus ZIF-8-Fe/Ni exhibited both high removal efficiency and good recyclability .
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROANALYSIS
·
2022
·Vol. 35
·期 1
·e202200158
·
IF 3.077
Liangyin Zhou,Hongji Li,Dandan Wang,Wei Jiang,Yuanyuan Wu,Liaofang Shang,Chunyi Guo,Chunbo Liu,Baixiang Ren
Zeolitic Imidazolate Frameworks (ZIFs) are considered as a novel porous material combining high stability in inorganic zeolites with high porosity and organic functionality of MOFs. The cage-like structure selectively and efficiently traps CO 2 , which is an indispensable and critical step for Electrocatalytic CO 2 Reduction Reaction (CO 2 RR). In this work, ultrasmall ZIF-8 nanomaterials are synthesized by tuning the molar ratio of the feedstock and used as electrocatalysts for the selective reduction of CO 2 to CO. The catalytic activity of the ultra-small size ZIF-8 material for the electrocatalytic reduction of CO 2 can reach satisfactory results with a Faraday efficiency of 91 % for CO and a stability of 12.5 h at a high applied potential of −1.8 V vs. RHE. The investigation can provide a new idea to explore for the design and improvement of catalysts for CO 2 RR.
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Hong Yao,Gang Jin,Guozhe Sui,Jinlong Li,Dongxuan Guo,Shuang Liang,Ze Luo,Rongping Xu,Chao Wang,Jing Tang
Z-scheme photocatalytic heterojunction is considered as an effective strategy to promote the photogenerated electron-hole separation for improving the efficiency of photocatalytic hydrogen precipitation from splitting water significantly. Herein, a novel Z-scheme 2D-ZnIn 2 S 4 /NiCoP heterojunction is successfully prepared by coupling NiCoP derived from ZIF-67 through phosphating treatment with 2D-ZnIn 2 S 4 lamellae via a facile hydrothermal method . The Z-scheme heterostructure of ZnIn 2 S 4 /NiCoP could suppress the recombination-rate of photogenerated electron-hole pairs and enhance the visible-light-driven photocatalytic hydrogen production . As a result, the hydrogen production rate of 2D-ZnIn 2 S 4 /NiCoP (10 wt% ZnIn 2 S 4 ) increase to 5098.12 μmol g −1 h −1 significantly with an apparent quantum yield (AQY) of 5.24% at 420 nm, which is 3.07 times than that of bare ZnIn 2 S 4 . The enhancement of photocatalytic performance is attributed to the following issues: 2D-ZnIn 2 S 4 could avoid the agglomeration of tiny ZnIn 2 S 4 , exposing more active sites and shortening the transmission distance of photogenerated carries; the formation of Z-scheme heterostructure could promote the separation of photogenerated electron-hole pairs; the unique hollow structure of NiCoP derived from ZIF-67 could inhibit the recombination of the photogenerated electron-hole. Overall, this work could provide a new idea for designing and preparing of visible-light-driven photocatalysts with high efficiency for photocatalytic hydrogen production.
✓ 已验证
产品关联
DOI
高影响因子
DESALINATION
·
2022
·
IF 11.211
Mengjiao Xia,Wentian Zhang,Yanchao Xu,Hongjun Lin,Yang Jiao,Liguo Shen,Renjie Li,Meijia Zhang,Huachang Hong
Polyamide nanofiltration membranes with an interlayer of either a plant polyphenol tannic acid (TA) coating to improve polyamide formation or zeolitic imidazolate framework-8 (ZIF-8) nanoparticles (NPs) as a sacrificial template have been recently attracting great interest, although none has reported such a dual-functional interlayer. In this study, we demonstrated a facile and controllable one-pot synthesis of novel ZIF-8@TA core-shell NPs. Mixing Zn 2+ , Hmim, and TA in an aqueous solution could readily give rise to these NPs. Microscopy characterizations showed that composition and morphology of NPs could be easily controlled by the amount of TA used. Comparing with the thin film nanocomposite (TFN) membrane prepared with ZIF-8 NPs as an interlayer, which had significant defects in its polyamide layer due to the aggregation of hydrophobic ZIF-8 NPs, the homogeneous and hydrophilic ZIF-8@TA NPs interlayered TFN membranes demonstrated intact polyamide layers. It was found that when 0.5 mg ZIF-8@TA1.0 NPs were used, the obtained TFN membrane showed a high water permeance of 20.7 L m −2 h −1 bar −1 and Na 2 SO 4 rejection of 96.6 %, typically outperforming other interlayer-based PA membranes reported elsewhere. This work provided not only a novel interlayer material but also deep insights into design of high-performance polyamide membranes.
✓ 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）