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
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材料科学
·
生物学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2016
·
IF 3.299
Xiaolu Wang,Jinxun Chen,Manquan Fang,Tao Wang,Lixin Yu,Jiding Li
In this contribution, zeolitic imidazolate framework (ZIF-7)/polydimethylsiloxane (PDMS) mixed matrix membranes (MMMs) with uniformly dispersed ZIF-7 were fabricated. The homogeneous dispersion of ZIF-7 nanoparticles in PDMS matrix and better interface compatibility were characterized by SEM and EDS. PV performance reveals that the MMMs display increased total flux and the highest separation factor occurs at 20 wt% ZIF-7 loading, which were 1689 g m −2 h −1 and 66 respectively as compared to 1080 g m −2 h −1 and 51 for pure PDMS membrane when separating 1 wt% butanol aqueous solution at 60 °C. The total flux reaches 3496 g m −2 h −1 with 80 wt% butanol in permeate for the enrichment of 5 wt% butanol solution at 60 °C. The enhanced flux may result from enlarged free volume in the polymer matrix caused by the incorporation of ZIF-7 nanoparticles. Moreover, the super-hydrophobic ZIF-7 pore channels and butanol preferential permeation may contribute to the improvement of separation factor. The result also shows that there is a 21.1% reduction of energy barrier for penetrant transportation for 20 wt% ZIF-7 filled PDMS membrane as compared to pristine PDMS membrane. A long period of pervaporation experiment was also carried out to investigate the structure stability of the ZIF-7/PDMS membrane, and the MMM remains intact during the 240 h continuous operation, which is the key to industrial application for membrane-based separation process. All above indicated that ZIF-7 is a good filler to fabricate butanol permselective pervaporation membranes for butanol separation and enrichment.
研究领域:
材料科学
·
化工分离技术
✓ 已验证
产品关联
DOI
高影响因子
Frontiers of Environmental Science & Engineering
·
2013
·Vol. 8
·期 2
·162-168
·
IF 0.886
Xie Jiangkun,Yan Naiqiang,Liu Fei,Qu Zan,Yang Shijian,Liu Ping
Porous ZIF-7 with the sodalite (SOD) cage structure (ZIF, Zeolitic imidazolate framework) were synthesized by the solvothermal method. Synthesized material was characterized by powder X-ray diffraction (PXRD), thermal gravity (TG), scanning electron microscopy (SEM) and N 2 adsorption analysis. ZIF-8 with the SOD structure and a little larger pore window was synthesized in a similar way and was characterized for comparisons. Thermal stability and structural stability of ZIF-7 were tested through PXRD analysis, and the capability of the material for CO 2 capture from simulated flue gas was investigated through physical adsorption method. The results showed that CO 2 adsorption capacity on ZIF-7 was about 48 mL·g −1 while the capacity on ZIF-8 was about 18 mg·g −1 (at 12°C and 0.98 P / P
0 relative pressure). Furthermore, the impact of flue gas components on adsorption capacity of ZIF-7 and the selectivity of CO 2 against N 2 on ZIF-7 was also investigated in this work.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 36
·28394-28400
·
IF 3.84
Yunpan Ying,Yuanlong Xiao,Jing Ma,Xiangyu Guo,Hongliang Huang,Qingyuan Yang,Dahuan Liu,Chongli Zhong
Metal–organic frameworks (MOFs) have exhibited promising applications in gas and liquid separation. As a subclass of MOFs, zeolitic imidazolate frameworks (ZIFs) are attracting more and more interest because of their unique thermal and chemical stability. One of the representative ZIFs, ZIF-7, has super-hydrophobic pores, making it a perfect filler in polymer membranes for recovering acetone from fermentation broths. In this study, mixed matrix membranes (MMMs) based on ZIF-7 and polydimethylsiloxane (PDMS) were prepared, which display improved acetone–water total flux and separation factors simultaneously compared with a pure PDMS membrane. The separation factor can reach up to 39.1 with a high flux of 1236.8 g m−2 h−1 at 333 K, which is the highest value among those reported up to now to the best of our knowledge.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 138
·期 20
·50424
·
IF 2.52
Junfeng Qian,Tingting Wu,Jianqun Shi,Hao Chang,Donghui Liu,Yichang Pan
Membrane-based technology is an attractive alternative in terms of CO 2 separation. Pebax-based membranes are regarded as potential candidates for CO 2 separation due to the favorable interaction between its poly (ethylene oxide) chains with CO 2 molecules and inorganic fillers. However, the separation performance for CO 2 /CH 4 mixture is still suffered from the moderate gas permeability and selectivity. To overcome this problem, in this work, amino-functionalized zeolite imidazolate framework (ZIF-7-NH 2 ) nanocrystals were used as fillers to blend with Pebax 1657 for fabricating mixed-matrix membranes (MMMs). XRD, Brunauer–Emmett–Teller (BET), scanning electron microscope, and 1 H nuclear magnetic resonance characterization indicated that ZIF-7-NH 2 with the highest crystallinity was synthesized. Fourier transform infrared spectroscopy, thermogravimetric analysis, differential scanning calorimetry (DSC), and Young's modulus showed that it has good interfacial interaction. Gas separation test results showed that both the CO 2 permeability and CO 2 /CH 4 selectivity of the 31 wt% ZIF-7-NH 2 /Pebax MMMs increased by 80 and 170%, respectively. The improved performance is attributed to the addition of ZIF-7-NH 2 nanocrystals and the favorable interfacial interactions between the polymer and ZIF-7-NH 2 nanocrystals. Furthermore, the polyvinylidene fluoride supported hollow fiber composite membranes also exhibit the long-term stability for CO 2 /CH 4 separation.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2020
·
IF 4.551
Jie Gao,Haizhuo Mao,Hua Jin,Chen Chen,Armin Feldhoff,Yanshuo Li
Membrane-based separation technology has evolved as a competitive approach for CO 2 capture from flue gas (mainly N 2 ). To achieve high separation performance, three partially NH 2 -, OH- and CH 3 OH- functionalized mixed-linker-ZIF-7 were successfully synthesized, and incorporated into polyether-block-amide (Pebax® 2533) polymer to form mixed-matrix membranes (MMMs). As evidenced by the CO 2 adsorption isotherms , introducing functional groups in the ZIF-7 framework was indeed beneficial for CO 2 adsorption. All MMMs composed of ZIF-7-NH 2 , ZIF-7-OH and ZIF-7-CH 3 OH offered better CO 2 /N 2 separation performance than the parent ZIF-7-Pebax® 2533 membrane, suggesting the positive effect of functionalized ZIF-7 fillers on the gas separation performance. Among the three functionalized ZIF-7 based MMMs, the ZIF-7-OH-Pebax MMMs exhibited the best performance for CO 2 /N 2 separation, which might be ascribed to the highest adsorption selectivity of CO 2 over N 2 predicted by ideal adsorbed solution theory (IAST) for ZIF-7-OH fillers. The 14% ZIF-7-OH-Pebax MMM showed high CO 2 permeability of 273 Barrer and CO 2 /N 2 separation factor of 38, which increased by 60% and 145% as compared with the neat Pebax membrane. The strategy of preparing functionalized MOFs with strong affinity for CO 2 provides an effective method to develop MMMs for highly efficient CO 2 separation.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Guangyu Zhu,Fuyan Kang,Xiaoya Ding,Chunxiao Yin,Fa-Qian Liu
Biofouling has been a persistent challenge for offshore equipment, significantly affecting its longevity. In this study, two-dimensional (2D) ZIF-7 nanosheets were synthesized via a hydrothermal method and modified with polydopamine (PDA) to enhance their dispersibility. A multifunctional ZIF-7@PDA-CeO2 nanocomposite was then prepared through in situ growth, where CeO2 was uniformly and securely anchored onto the ZIF-7@PDA surface, facilitated by the large specific surface area and its electrostatic interactions between ZIF-7@PDA. UV–vis absorption spectra demonstrate that the ZIF-7@PDA-CeO2 exhibit haloperoxidase-like (HPO-like) catalytic activity, efficiently catalyzing the oxidation of NH4Br and H2O2 to generate HBrO. Antibacterial assays indicate that ZIF-7@PDA-CeO2 possesses strong bactericidal activity and effectively inhibits biofilm formation. Furthermore, ZIF-7@PDA-CeO2 are used as fillers to prepare ZIF-7@PDA-CeO2/EP composite coating, and the antibacterial and long-term corrosion resistance is also explored. We believe this work offers a sustainable solution to the challenges of biofouling and corrosion in marine environments.
研究领域:
材料科学
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海洋工程
·
生物医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Xin Zhang,Li Tian,Kexin Wu,Zhuo Sun,Qian Wu,Xiangyu Shan,Yingjie Zhao,Ruizhan Chen,Juan Lu
An electrochemical luminescence (ECL) sensor for the detection of glucose was constructed by covering CdTe nanomaterials, ZIF-7 and glucose oxidase (GOD) on the electrode surface, respectively. CdTe and ZIF-7, as co-reaction promoters, could amplify ECL signals through synergy effect. The results demonstrated that ECL intensity increased when the concentration of glucose increased. Based on the change of ECL intensity, a method for the determination of glucose was established. Possible response mechanisms were also studied. The parameters of measurement conditions were optimized. The linear range of glucose was 2.0 × 10 −10 ∼ 2.0 × 10 −5 mol L −1 and the detection limit was 6.7 × 10 −11 mol L −1 under the optimal conditions. The constructed sensor had high sensitivity and selectivity. The results were satisfactory for the determination of glucose in real human serum samples.
研究领域:
分析化学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Lei Yao,Chao Hong,Yangxu Qi,Lie Wu
In this study, we developed a novel magnetic composite of walnut shell biochar (WSB) and modified it with ZIF-7 for the purpose of removing Co 2+ ions. We conducted a comprehensive evaluation of its performance in Co 2+ removal, considering various factors such as contact time, temperature, adsorbent dose, pH, and initial Co 2+ concentration. Utilizing response surface methodology-central composite design (RSM-CCD), we examined the interactions between these variables. The specific surface area and magnetic saturation value of the WSB/MnFe 2 O 4 /ZIF-7 composite were determined as 170.560 m 2 .g −1 and 23.469 emu.g −1 , respectively. ANOVA analysis indicated that our model effectively captures the interactions between variables, with a high R 2 value of 0.9982, explaining 99.82 % of the experimental data. Optimal conditions for maximum Co 2+ adsorption efficiency (99.05 %) were identified as follows: a contact time of 44.82 min, pH of 6.04, adsorbent dose of 0.947 mg.L -1 , temperature of 25.55 °C, and Co 2+ concentration of 11.13 mg.g −1 . Kinetic studies revealed that the Pseudo 2nd order kinetic model provided the best fit to the experimental data. The negative entropy parameter indicated a decrease in disorderliness during the adsorption process, while the exothermic nature of adsorption was confirmed by enthalpy values of −92.751 and −40.511 kJ.mol −1 for WSB/MnFe 2 O 4 /ZIF-7 and WSB, respectively. Furthermore, the Langmuir isotherm model demonstrated excellent fitting to the isotherm results, suggesting the dominance of homogeneous surfaces in adsorption. The maximum adsorption capacities for Co 2+ using WSB/MnFe 2 O 4 /ZIF-7 and WSB were determined to be 29.26 and 22.39 mg.g −1 , respectively. The WSB/MnFe 2 O 4 /ZIF-7 magnetic composite demonstrates promising potential for efficiently removing Co 2+ from both natural water sources and industrial wastewater, highlighting its versatility and effectiveness in environmental remediation applications.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Yi Ren,Die He,Tong Wang,Hong Qi
Organosilica membranes with good hydrothermal stability are promising for pre-combustion capture, but the trade-off effect still constrains their gas separation performance. Herein, we prepared hybrid membranes by incorporating ZIF-7 nanoparticles into 1, 2-bis(triethoxysilyl)ethane (BTESE) networks to improve the H 2 /CO 2 permselectivity by the intrinsic properties of nanoparticles. The effect of inorganic fillers was investigated by adjusting the doping content of ZIF-7 nanoparticles. We found that the H 2 permeance of hybrid membranes remained at ∼10 −6 mol·m −2 ·s −1 ·Pa −1 , while the H 2 /CO 2 permselectivity decreased with increasing nanoparticle doping content. The E-ZIF-7-0.4 hybrid membrane showed H 2 permeance of 1.2 × 10 −6 mol·m −2 ·s −1 ·Pa −1 and H 2 /CO 2 permselectivity of 21.7. Our results may offer valuable insights into preparing hybrid membranes with optimal nanoparticle doping content.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
BIOCHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 3.8
Jing Fang,Lingzhi Luo,Wenyan Li,Hao Li
Ethanol, as an important solvent and basic chemical feedstock, has widespread applications in the pharmaceutical, food, and fine chemical industries, including processes such as absorption, washing, and extraction. However, methanol and water are inevitable by-products in the industrial production of ethanol, whether through biological fermentation or chemical synthesis. Particularly methanol, which is harmful to both health and the environment, is typically present in ethanol products at low concentrations, posing a significant challenge for its effective removal. We designed citric acid-modified 4 A zeolites and a bimetallic organic framework Cu@ZIF-7. Under optimal modification conditions, the modified 4 A zeolite showed a 39.15% and 37.21% increase in selectivity for methanol and water, respectively, compared to the initial 4 A zeolite. The yield of qualified products increased by 44.71%. Furthermore, Cu@ZIF-7 exhibited a methanol adsorption capacity of 1.125 mg·g -1 , which is 3.42 times that of the initial 4 A zeolites. Density Functional Theory (DFT) calculations confirmed that the introduced Cu sites are associated with this enhanced methanol adsorption capacity. Experimental evidence suggests that these adsorbents perform exceptionally in purifying ethanol, particularly in the removal of trace methanol. As a new, environmentally friendly separation method, it holds great potential for obtaining high-purity ethanol.
研究领域:
化学工程
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2025
·
IF 7.3
Qiuli Zhang,Jiahui Liu,Saifei Hu,Chengxian Yin,Naixin Lv,Rong Wei
Metal-organic framework (MOF) materials have significant advantages in corrosion protection due to their remarkable specific surface area and exceptional porosity. This work combined cerium dioxide (CeO 2 ) nanoparticles and zeolitic imidazolate framework-7 (ZIF-7) with the long-chain hydrophobic agent hexadecyltrimethoxysilane (HDTMS) to create a composite nanostructure (CeO 2 @ZIF-7@HDTMS) with a multistage barrier function. The structure takes CeO 2 nanoparticles as the core to achieve chemical corrosion inhibition by using its oxygen-deficient property; ZIF-7 is induced to form an ordered microporous adsorption layer at its periphery by surface carboxylic acid molecules; and ultimately, the outer repulsive barrier is constructed with the help of hydrophobic modification of HDTMS, thus forming a synergistic anticorrosion mechanism in three dimensions, namely physical barrier, chemical passivation, and hydrophobic protection, and constructing a ‘Physical barrier + double synergistic corrosion inhibition’ three-level protection system. The successful preparation of CeO 2 @ZIF-7@HDTMS nanoparticles was confirmed by a number of characterization tools, such as field emission scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FT-IR). Subsequently, they were well characterized by electrodynamic polarization curves, electrochemical impedance spectroscopy (EIS), and salt spray test aspects, which indicated that CeO 2 @ZIF-7@HDTMS epoxy composite coatings have good corrosion protection and hydrophobic properties. After 60 days of immersion, EIS analysis showed that the impedance of the 1.0 % EP/CeO 2 @ZIF-7@HDTMS coating was still as high as 4.636 × 10 8 Ω·cm 2 and its low-frequency impedance was about two orders of magnitude higher than that of the pure epoxy coating, which further indicated that the composite coating could provide excellent corrosion resistance and durability. In conclusion, CeO 2 @ZIF-7@HDTMS nanoparticles as fillers offer an innovative idea for the development of multifunctional and long-life anticorrosive coatings, broaden the application of metal oxide@MOF composites, and open up a new direction for the design and preparation of nanostructured materials.
研究领域:
材料科学
·
腐蚀防护
·
纳米技术
✓ 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）