COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Zhen Li,Daorong Sun,Jiawen Chi,Songjian Zhao
To enhance mercury removal efficiency at low temperature in flue gas , UiO-66-NH 2 framework was functionalized using halogen group via a diazotization process. -NH 2 was successfully replaced by halogen groups, and diazotization process had little impact on the morphology and the structural information of UiO-66-NH 2 , indicated UiO-66-X (Cl, Br, I) had an excellently chemical stability. Hg 0 capture experiments indicated added iodine (I) functional group was the most effective compared with chlorine (Cl) and bromine (Br). UiO-66-I can reach nearly 100% Hg 0 removal efficiency at 25–150 ℃，and the difference was the duration time for high performance. Moreover, oxygen played an important role for Hg 0 removal, which could be activated by the halogen functional group and then reacted with Hg 0 , finally existed on the adsorbent in the form of UiO-66-X … Hg-O. Furthermore, adsorption kinetic analysis indicated mercury adsorption at surface active sites was the rate controlling step .
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
Materials
·
2019
·Vol. 12
·期 6
·942
·
IF 2.972
Huo-Xi Jin,Hong Ping Xu,Nan Wang,Li-Ye Yang,Yang-Guang Wang,Di Yu,Xiao-Kun Ouyang
The ability to remove toxic heavy metals, such as Pb(II), from the environment is an important objective from both human-health and ecological perspectives. Herein, we describe the fabrication of a novel carboxymethylcellulose-coated metal organic material (MOF-5–CMC) adsorbent that removed lead ions from aqueous solutions. The adsorption material was characterized by Fourier-transform infrared spectroscopy, X-ray diffractometry, scanning electron microscopy, and X-ray photoelectron spectroscopy. We studied the functions of the contact time, pH, the original concentration of the Pb(II) solution, and adsorption temperature on adsorption capacity. MOF-5–CMC beads exhibit good adsorption performance; the maximum adsorption capacity obtained from the Langmuir isotherm-model is 322.58 mg/g, and the adsorption equilibrium was reached in 120 min at a concentration of 300 mg/L. The adsorption kinetics is well described by pseudo-second-order kinetics, and the adsorption equilibrium data are well fitted to the Langmuir isotherm model (R2= 0.988). Thermodynamics experiments indicate that the adsorption process is both spontaneous and endothermic. In addition, the adsorbent is reusable. We conclude that MOF-5–CMC is a good adsorbent that can be used to remove Pb(II) from aqueous solutions.Keywords:carboxymethylcellulose;adsorption;Pb(II);MOF-5
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS CHEMISTRY
·
2012
·Vol. 22
·期 34
·17833-17841
·
IF 5.968
Cheng-Xiong Yang,Xiu-Ping Yan
The adsorption and extraction of fullerenes on the metal–organic framework MIL-101(Cr) were studied in detail in terms of kinetics, thermodynamics, adsorption isotherms, competitive adsorption, and breakthrough curves. The adsorption of C60 and C70 on MIL-101(Cr) follows a pseudo-second-order kinetic model. The adsorption rate constant for C70 is 3 to 5 times that for C60, showing faster and easier adsorption of C70 over C60 on MIL-101(Cr). Intraparticle diffusion model analysis reveals that the adsorption of C60 and C70 on MIL-101(Cr) proceeds by two phases, surface sorption and intraparticle/pore diffusion. The adsorption of fullerenes on MIL-101(Cr) is controlled by entropy changes. The maximum adsorption capacity for C70 at 30 °C (198.4 mg g−1) is 29 times that for C60 (6.76 mg g−1). MIL-101(Cr) shows much more favorable adsorption of C70 and higher fullerenes than C60 with a high selectivity (αC70/C60 = 24). Selective extraction of C70 and higher fullerenes from crude carbon soot can be easily achieved on MIL-101(Cr) via a simple adsorption–desorption process. The used MIL-101(Cr) can be regenerated by washing with o-dichlorobenzene under ultrasonication. The high selectivity, fast adsorption, easy desorption, and excellent reusability makes MIL-101(Cr) attractive as a novel adsorbent for the enrichment and extraction of C70 and higher fullerenes.
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
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Yongwei Chen,Houxiao Wu,Daofei Lv,Renfeng Shi,Yang Chen,Qibin Xia,Zhong Li
In the petrochemical industry, ethane/ethylene (C2H6/C2H4) separation is one of the most important processes. Herein, we reported an iron-based metal–organic framework MIL-142A for efficiently trapping C2H6 from C2H6/C2H4 mixture, exhibiting preferential adsorption of C2H6 over C2H4. After various characterization techniques to confirm the successful preparation of MIL-142A, the C2H6 and C2H4 adsorptive separation performance was systematically investigated. Results showed that MIL-142A had remarkably higher C2H6 adsorption capacities than that of C2H4 at 298, 288, and 278 K, such as C2H6 and C2H4 adsorption capacities of 3.8 and 2.9 mmol/g at 298 K and 100 kPa, respectively. In addition, the C2H6 and C2H4 adsorption heats were relatively low and in the corresponding ranges 27.3–25.1 and 26.2–23.8 kJ/mol, which is a favorable property for the regeneration of MIL-142A with less energy penalty. Furthermore, it was inferred that the difference between the adsorption heat for C2H6 and C2H4 with the MIL-142A framework governed the selective adsorption of C2H6 over C2H4. The ideal adsorbed solution theory (IAST) selectivity of C2H6/C2H4 was high up to 5.8 in the initial low pressure and then decreased to 1.5 at 298 K and 100 kPa. Besides, breakthrough experiments also corroborated its efficient separation of C2H6/C2H4 mixture. Additionally, MIL-142A had excellent moisture stability, and its framework remained still intact after being exposed to humid conditions (80% RH) for 15 days. These comprehensive properties demonstrated that this unique material MIL-142A, as a high-performance C2H6-selective adsorbent, can be potentially used for highly adsorptive separation of the C2H6/C2H4 mixture.
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 MATERIALS SCIENCE
·
2018
·Vol. 54
·期 3
·2093-2101
·
IF 2.993
Wu Yanzi,Ma Yujie,Xu Guanhong,Xia Tianyi,Liu Wenxuan,Dong Zezhong,Yuan Qing,Zhang Cong,Hu Qin
Two novel porous metal–organic frameworks (MOFs) Cu(TCPBDA) and Cd(TCPBDA) based on a new ligand, namely N,N,N′,N′-tetrakis(4-carboxyphenyl)biphenyl-4,4′-diamine (H 4 TCPBDA), were synthesized by solvent thermal method and characterized with scanning electron microscopy, powder X-ray diffraction, BET analysis and spectrofluorometry. The static adsorption of the two MOFs for lead ions (Pb 2+ ) was investigated. Cu(TCPBDA) showed a higher adsorption capacity for Pb 2+ compared with Cd(TCPBDA), and its maximum adsorption capacity was 300 mg/g. The adsorption performance of Cu(TCPBDA) was then further studied. It was found that the adsorption of Cu(TCPBDA) for Pb 2+ fitted the Freundlich model and pseudo-second-order equation very well. The adsorption ability of Cu(TCPBDA) was applied to fast and efficient adsorption for Pb 2+ in toner. The results indicates that Cu(TCPBDA) is a promising material in adsorption and removal of heavy metal ions.
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
INORGANIC CHEMISTRY COMMUNICATIONS
·
2022
·
IF 3.428
Jia Wang,Deyue Yan,Wei Huang
A fluorescence metal-organic framework [Zn 3 (APT) 4 ]·2H 2 O (Zn-APT) was synthesized from Zn(NO 3 ) 2 ·6H 2 O and 2-amino-6-purinethiol (ATP) by the solvothermal reaction. Zn-APT has a novel compact structure with a nbo topology type. The analyses of single-crystal diffraction reveal that Zn-APT crystallizes in a cubic crystal system and F d 3 ¯ c space group. Based on a large amount of π-conjugated organic ligands of ATP and d 10 metal center of Zn 2+ , Zn-APT can emit strong luminescence. It can be used as a fluorescent probe to detect Fe 3+ ion effectively. The detection limit is 0.28 μM and K sv (quenching efficiency) is 2.1 × 10 4 M −1 . In addition, Zn-APT can adsorb hemoporphyrin dihydrochloride to produce a red-brown crystal Zn-APT-PH. Interestingly, it can also be used to detect Fe 2+ ion efficiently with the detection limit of 0.12 μM and K sv of 1.9 × 10 4 M −1 .
研究领域:
化学
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2022
·Vol. 27
·期 13
·4312
·
IF 4.927
Xiaowei Wang,Yingjie Zhao,Yiqi Sun,Dahuan Liu
Residual antibiotics in wastewater have gained widespread attention because of their toxicity to humans and the environment. In this work, Cu-doped ZIF-8s (Cu-ZIF-8s) were successfully synthesized by the impregnation of Cu2+in ZIF-8 and applied in the removal of ofloxacin (OFX) from water. Remarkably, excellent adsorption performance was obtained in Cu-ZIF-8s, especially for Cu-ZIF-8-1, in which the adsorption capacity (599.96 mg·g−1) was 4.2 times higher than that of ZIF-8 and superior to various adsorbents reported previously. The adsorption kinetics and adsorption isotherm follow the pseudo-second-order model and the Langmuir model, respectively. Furthermore, the removal efficiencies of OFX in Cu-ZIF-8-1 reached over 90% at low concentrations. It was revealed that electrostatic interaction and complexation play important roles in the adsorption process. In addition, the material can be regenerated by simple methods. Therefore, the obtained Cu-doped MOFs may have a promising application in the treatment of antibiotic-containing wastewater.Keywords:adsorption;complexation;metal-organic frameworks;ofloxacin
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Polymers
·
2022
·Vol. 14
·期 2
·283
·
IF 4.967
Wei Chen,Ping Zhu,Yating Chen,Yage Liu,Liping Du,Chunsheng Wu
Iodine has been widely used as an effective disinfectant with broad-spectrum antimicrobial potency. However, the application of iodine in an antibacterial polymer remains challenging due to its volatile nature and poor solubility. Herein, iodine immobilized UiO-66-NH2metal-organic framework (MOF) (UiO66@I2) with a high loading capacity was synthesized and used as an effective antibacterial additive for poly(ε-caprolactone) (PCL). An orthogonal design approach was used to achieve the optimal experiments’ conditions in iodine adsorption. UiO66@I2nanoparticles were added to the PCL matrix under ultrasonic vibration and evaporated the solvent to get a polymer membrane. The composites were characterized by SEM, XRD, FTIR, and static contact angle analysis. UiO-66-NH2nanoparticles have a high iodine loading capacity, up to 18 wt.%. The concentration of iodine is the most important factor in iodine adsorption. Adding 0.5 wt.% or 1.0 wt.% (equivalent iodine content) of UiO66@I2to the PCL matrix had no influence on the structure of PCL but reduces the static water angle. The PCL composites showed strong antibacterial activities againstStaphylococcus aureusandEscherichia coli. In contrast, the same content of free iodine/PCL composites had no antibacterial activity. The difference in the antibacterial performance was due to the different iodine contents in the polymer composites. It was found that MOF nanoparticles could retain most of the iodine during the sample preparation and storage, while there was few iodine left in the free iodine/PCL composites. This study offers a common and simple way to immobilize iodine and prepare antibacterial polymers with low antiseptic content that would reduce the influence of an additive on polymers’ physical properties.Keywords:UiO-66-NH2metal-organic framework;iodine;poly(ε-caprolactone);antibacterial
研究领域:
材料科学
·
生物学
·
医学
✓ 已验证
DOI
PubMed
高影响因子
Catalysts
·
2023
·Vol. 13
·期 3
·640
·
IF 3.9
Cong Wang,Gang Li,Hongchen Guo
MOFs have attracted widespread attention in the field of catalytic ethylene dimerization. Compared with post-synthetic modification, ion exchange and other methods to introduce external active centers, the direct use of MOF materials as catalysts is still the most convenient and prospective. Herein, the NiBTCs are synthesized using a one-pot method in two kinds of solvent and characterized by XRD, FT–IR, ICP–OES, XPS, TGA and N2physical adsorption. After treatment at 150 °C, the catalytic activities of both materials in ethylene dimerization are up to 470.9, and 647.0 gpro./(gcat.·h) and the selectivity of 1-butene in all products could reach 83.2% and 81.7%, respectively. Stability testing of the catalysts demonstrated that they do not decompose during the reaction, but their reuse performance is degraded. In addition, a probable Cossee–Arlman–type mechanism is proposed. The NiBTCs are shown to have superior catalytic performance in ethylene dimerization compared to employing Ni(pyz)2Cl2or α–Ni(im)2as catalysts.Keywords:ethylene dimerization;NiBTCs;MOFs;1-butene
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2021
·
IF 6.558
Ning Wu,Hao Guo,Mingyue Wang,Yujuan Cao,Lei Sun,Fan Yang,Tingting Zhang,Liping Peng,Yinsheng Liu,Wu Yang
Metal-organic frameworks (MOFs) can perform later transformation without compromising the integrity of the overall framework, and a variety of chemical reactions can be used to modify framework components. Postsynthetic modification (PSM) of MOFs has been developed as an alternative strategy that can expand the range of MOF functional groups. Considering the p-type semiconducting visible light active performance of CuBi 2 O 4 (CBO) and the unique porous nanostructure and stability of zeolitic imidazolate framework-8 (ZIF-8), in this work, a novel core-shell coordination assembled hybrid based on p-type semiconductor@MOFs (Eu-CBO@ZIF-8) is prepared for the first time via in-situ growth and postsynthetic metal exchange. A series of detailed characterizations were conducted to confirm the successful synthesis of the material. Moreover, we are focusing on using this material as a new dual-functional sensing material for simultaneous detection and removal of tetracycline (TC), which shows an outstanding analytical performance with a low detection limit of 17 nM, relatively broad linear range (0–70 μM), fast response of less than 120 s, and excellent adsorption performance (377.07 mg g −1 ) toward TC. In addition, the sensitive luminescence response caused by TC makes Eu-CBO@ZIF-8 undergo a significant color transition from dark to red under UV-lamps, which is beneficial for visual analysis with the naked eye. The possible detection and adsorption mechanisms, including coordination between Eu 3+ and the detected substance, the hydrogen bond between ligand and the detected substance, were further discussed. In addition, the practical feasibility of Eu-CBO@ZIF-8 for TC sensing was also studied, with a satisfactory recovery rate of 96.9%–104.6% and RSD ≤3.32%. These results indicate that this material can be used for the detection and adsorption of TC in actual samples.
研究领域:
材料科学
·
环境科学
·
分析化学
✓ 已验证
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2021
·
IF 4.641
Summaira Saghir,Zhenggang Xiao
ZIF-8 nanoparticles were prepared through the simple and facile method at room temperature and subsequently applied for the simultaneous adsorption of two antibiotics, tetracycline (TC) and minocycline (MC). The prepared ZIF-8 exhibits regular rhombic dodecahedron having meso and macropores structure with a specific surface area of 1516.06 (m²/g), indicating that ZIF-8 could be an ideal adsorbent material for the adsorption of antibiotics. Moreover, the adsorption conditions were optimized in detail. All the characterizations of ZIF-8 after adsorption reveal the successful adsorption of TC and MC on ZIF-8. The adsorption kinetics and isothermal data of both antibiotics fitted well with the pseudo second order and Langmuir isotherm model. The adsorption behaviour of TC and MC on ZIF-8 was based mainly on electrostatics and π - π stacking interactions. This study revealed that ZIF-8 could be used as a useful adsorbent in treating wastewater contaminated with multiple antibiotics.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2021
·
IF 6.986
Mengya Cao,Hao Wang,Haoran Tang,Dandan Zhao,Yongxin Li
Metal–organic frameworks (MOFs) can improve the stability and activity of enzymes under the MOF encapsulation. However, it remains a challenge to explore the effects of the MOF environment on enzymatic activity in a confined space. In this work, we immobilized the enzyme inside a glass nanopore to study the catalytic activity and stability of the enzyme in the MOF environment. Horseradish peroxidase (HRP) is encapsulated in zeolitic imidazolate framework-90 (ZIF-90) and zeolitic imidazolate framework-8 (ZIF-8), which are used as the catalytic platforms. The HRP can catalyze 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid)diammonium salt (ABTS) molecules to generate ABTS+ ions, and the change of the transmembrane ion current will be monitored in real time. As the concentration of H2O2 increases, the amount of produced ABTS+ will increase; thus, the ionic current increases. The effects of the MOF structure on enzyme activity and stability are also investigated. The HRP encapsulated in the MOF and modified inside the nanopore provides a novel and unlabeled design for studying enzymatic catalysis in a confined environment, which should have extensive applications in chemical-/bio-sensing, electrocatalysis, and fundamental electrochemistry.
研究领域:
生物化学
·
材料科学
·
分析化学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）