CHEMICAL ENGINEERING JOURNAL
·
2016
·
IF 5.31
Ting Wang,Pan Zhao,Nan Lu,Hongche Chen,Conglu Zhang,Xiaohong Hou
Attractive magnetic metal-organic framework (MOF) material Fe 3 O 4 /MIL-101(Cr) (Matérial Institute Lavoisier, MIL) was synthesized by a simple reduction–precipitation method, and applied as an effective sorbent to the removal of two acid dyes, acid red 1 (AR1) and orange G (OG), in water. The novel synthetic method avoided the oxidation of Fe 2+ and made the Fe 3 O 4 /MIL-101(Cr) composite have the advantages of strong magnetism, large surface areas and excellent dispersion effect. Parameters that influenced the adsorption process, such as solution pH, adsorbent dosage, ionic strength, and so on, were investigated. Under the optimum conditions, adsorption kinetics and isotherms were determined from the obtained experimental data. The adsorption kinetics suggested the adsorption process of Fe 3 O 4 /MIL-101(Cr) toward AR1 and OG met the pseudo-second-order kinetic model. The adsorption isotherms were fitted by Langmuir, Freundlich and Dubinin–Radushkevich (D–R) isotherm models. Compared with the Freundlich and D–R models, the Langmuir isotherm model was found to be suitable to describe the equilibrium data, suggesting that the uptake of AR1 and OG by the Fe 3 O 4 /MIL-101(Cr) would be through monolayer adsorption. The thermodynamic results demonstrated that the adsorption was a spontaneous, exothermic and entropy decreased process. In addition, the Zeta potential data with pH value of AR1 and OG indicated that the electrostatic interactions between the dyes and the adsorbent might be critical to the adsorption mechanism. The used Fe 3 O 4 /MIL-101(Cr) could be regenerated by washing with NaOH solution and reused at least six times. The maximum adsorption capacities of the magnetic composite toward AR1 and OG were up to 142.9 mg g −1 and 200.0 mg g −1 , respectively. These results demonstrated that the novel composite would be an effective and easily re-usable adsorbent for AR1 and OG.
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APPLIED ORGANOMETALLIC CHEMISTRY
·
2025
·Vol. 39
·期 3
·e70037
·
IF 0
Qiuyun Zhang,Maozhen He,Jialu Wang,Shijian He,Mei Deng,Yanhui Lei,Xiaojuan Zhang,Jingsong Cheng,Zhengjun Liu,Yutao Zhang
The construction and optimization of an effective photocatalyst for photodegradation of persistent recalcitrant organic remains challenging. In this work, MIL-101(Cr)-based nanocomposites (AgI@MCr) are proposed to be fabricated by a simple, green solvent, and room temperature in situ preparation strategy, achieving a highly efficient photocatalytic degradation of organic dye rhodamine B (RhB) molecule under visible light irradiation. Extensive characterization (XRD, FTIR, N 2 adsorption–desorption, SEM and EDS, TG, XPS, UV–vis DRS, PL, transient photocurrent, and EIS) confirmed the composite material's structure, morphology, elemental composition, and optical characteristics. Among all the prepared nanocomposites, AgI@MCr-2 demonstrates outstanding photocatalytic performance for RhB with a removal efficiency of 95.4% within 70 min, and a reaction kinetics of 0.0392 min −1 , superior to pristine AgI or MIL-101(Cr), and also shows excellent durability, retaining over 80% RhB degradation efficiency after four cycles. Remarkably, the significant enhancement is attributed to the built interfacial contact and synergistic effect between substances in the nanocomposite, high specific surface area, strong visible light–harvesting capacity, low bandgaps, and high electron–hole pair separation. In addition, a possible degradation route for the AgI@MCr nanocomposite is further proposed using various analysis techniques. This study provides valuable references for developing effective multicomponent MOF-based photocatalytic composite materials for dyeing wastewater treatment and environmental remediation.
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APPLIED ORGANOMETALLIC CHEMISTRY
·
2024
·Vol. 38
·期 9
·e7614
·
IF 3.7
Qiuyun Zhang,Feiran Xie,Jialu Wang,Tianqing Wang,Jiao Lei,Weihua Li,Jingsong Cheng,Yutao Zhang
For nearly a century, the excessive discharge of organic contaminants has gradually polluted water and endangered people's health, and photocatalysis has been prominently employed to remove persistent recalcitrant organic. Here, MIL-101(Cr) was firstly employed to introduce thin-layered Bi 2 O 2 CO 3 for the formation of Bi 2 O 2 CO 3 /MIL-101(Cr) nanosheet composite, by a simple and low-temperature in-situ growth approach. The phase, morphology, optical, and surface characteristics of the fabricated composite were characterized through XRD, FTIR, SEM-EDS, N 2 adsorption–desorption, UV–Vis DRS, PL, TG, and XPS techniques, and the ability in the photocatalytic breakdown of rhodamine B (RhB) molecule under visible light was also studied. The results of characterization analysis and optical analysis exhibited that Bi 2 O 2 CO 3 /MIL-101(Cr) has large pore size, good visible light response-ability, and the heterojunction created by intercalating Bi 2 O 2 CO 3 on MIL-101(Cr). Photocatalytic studies revealed that Bi 2 O 2 CO 3 /MIL-101(Cr) had superior RhB degradation activity than pure MIL-101(Cr) and Bi 2 O 2 CO 3 , which achieved 97.1% with visible light irradiation for 20 mg/l RhB. Meanwhile, the Bi 2 O 2 CO 3 /MIL-101(Cr) composite displayed good recyclability after three cycles as revealed by XRD and FTIR analysis proving their excellent stability. This study provides feasible insight into developing novel and efficient MIL-101-based heterojunction catalysts for environmental remediation in the future.
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DALTON TRANSACTIONS
·
2025
·
IF 3.3
Yanjia Zhou,Xiao-Dong Tang,Jingjing Li,Da-Yong Qing,Hong Wang
MIL-101(Cr) and MIL-100(Fe) are both representative MIL-type Metal-Organic-Frameworks (MOFs) materials, renowned for their large specific surface areas and size-tunable characteristics, making them suitable candidates for Li+ extraction from lithium-containing solvent. By introducing -NH2 functional groups and using LiNO3 as both a template and mineralizer, the functionalized MOF materials Li/NH2/MIL-101(Cr) and Li/NH2/MIL-100(Fe) were synthesized. Following modification, their Li+ adsorption capacities were increased, reaching 43.58 and 38.22 mg/g, respectively. The dosage of mineralizer, initial Li+ concentration, adsorbent dosage, solution pH value, and temperature all have an impact on the adsorption capacity of adsorbents. In addition, through the establishment of the pseudo-first-order kinetic model, pseudo-second-order kinetic model, as well as Langmuir and Freundlich thermodynamic models, it can be known that the adsorption of the materials belonged to monolayer chemisorption, and the adsorption process was exothermic. Furthermore, both adsorbents showed good reusability, retaining over 85% of their initial adsorption capacity after four adsorption-desorption cycles, highlighting their practical applicability in lithium recovery processes. In Mg-Li mixed solution systems, both materials exhibited exceptional Li+ selectivity. At a low Mg2+/Li+ ratio of 3, the separation factor (α) exceeded 80; even at a high Mg2+/Li+ ratio of 10, α remained near 50. Additionally, in systems with coexistence of multiple interfering ions, the distribution coefficient (Kd) followed the order: Li+ ≫ Mg2+ > Ca2+ > Na+ > K+. In the mixed systems, Li/NH2/MIL-101(Cr) and Li/NH2/MIL-100(Fe) exhibited certain separation effect for Li+ against competing cations.
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高影响因子
MOLECULES
·
2024
·Vol. 29
·期 14
·3417
·
IF 4.2
Pengfei Zhu,Zhaoxia Hu,Shouwen Chen
The development of economical catalysts that exhibit both high activity and durability for chlorinated volatile organic compounds (CVOCs) elimination remains a challenge. The oxidizing and acidic sites play a crucial role in the oxidation process of CVOCs; herein, praseodymium (Pr) was introduced into CrOx catalysts via in situ pyrolysis of MIL-101(Cr). With the decomposition of the ligand, a mixed micro-mesoporous structure was formed within the M-Cr catalyst, thereby reducing the contact resistance between catalyst active sites and the 1,2-dichloroethane molecule. Moreover, the synergistic interaction between chromium and praseodymium facilitates Oβspecies and acidic sites, significantly enhancing the low-temperature catalytic performance and durability of the M-PrCr catalyst for 1,2-dichloroethane (1,2-DCE) oxidation. The M-30PrCr catalyst possess enhanced active oxygen sites and acid sites, thereby exhibiting the highest catalytic activity and stability. This study may provide a novel and promising strategy for practical applications in the elimination of 1,2-DCE.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Quan Huo,Xiaoran Qi,Jianshu Li,Gongquan Liu,Yao Ning,Xubiao Zhang,Boyu Zhang,Yanfei Fu,Suyan Liu
A series of direct Z-scheme α-Fe 2 O 3 /MIL-101(Cr) hybrids were successfully prepared through a facile hydrothermal method in this work. And, the materials were characterized by some technologies including X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM), Fourier-transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), N 2 adsorption-desorption, photoluminescence (PL) spectroscopy, Ultraviolet-visible (UV–vis) diffuse reflectance spectroscopy (DRS) and electron spin resonance (ESR). The photocatalytic activities of the hybrids were evaluated by degradation of carbamazepine (CBZ) under visible light irradiation. It is found that 100% of CBZ was able to be removed after 180 min irradiation over the optimum α-Fe 2 O 3 (0.3)/MIL-101(Cr) hybrid. The superior activity was engendered from good textural properties and the formation of a direct Z-scheme heterojunction in the hybrid. The decomposition process of CBZ and the formation of intermediate products were analyzed through liquid chromatography-tandem mass spectrometry (LC–MS) and a possible photodegradation pathway of the CBZ was proposed. Also, the possible mechanism for the photodegradation process was provided to illustrate the excellent performance. The work has paved a new way for the application of MOF materials in the design of efficient Z-scheme system for organic pollution degradation in wastewater.
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JOURNAL OF CHROMATOGRAPHY A
·
2026
·
IF 4
Lin Lv,Hongmei Liu,Tao Song,Yan Zhao
Given the extensive use of amphenicol antibiotics and their potential adverse effects on human health, the development of simple and highly sensitive detection methods is essential to ensure food safety. In this work, a novel and highly efficient magnetic sorbent based on β-cyclodextrin-modified magnetic multi-walled carbon nanotubes functionalized with MIL-101(Cr) (Fe 3 O 4 @β-CD@MWCNTs@MIL-101(Cr)) was developed and combined with ultra-high-performance liquid chromatography-mass spectrometry (UHPLC-MS/MS) to achieve highly sensitive detection of three amphenicol antibiotics (chloramphenicol, thiamphenicol, and florfenicol) in honey samples. The key factors influencing extraction efficiency in the magnetic solid-phase extraction process were identified using the Plackett-Burman experimental design, whereas the optimal experimental conditions were determined through Box-Behnken design-based response surface methodology optimization. Under these optimized conditions, favorable linear relationships for amphenicol antibiotics were observed within the concentration range of 0.5–250 ng mL − 1 (R 2 ≥ 0.9951). The method exhibited detection limits of 0.04–0.07 μg kg − 1 . Recovery rates ranged from 83.2% to 97.9%, with intra-day and inter-day precisions both below 7.2%. This method provides an efficient tool for monitoring amphenicol antibiotics in complex matrices.
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POLYHEDRON
·
2022
·
IF 2.975
Chunqing Wang,Na Xia,Siming Zhu,Lin Chen,Liang Chen,Zhendong Wang
In this study, α- l -rhamnosidase was immobilized on magnetic Fe 3 O 4 /MIL-101 (Cr) nanoparticles using MIL-101(Cr) as precursor by crosslinking method. The crosslinking agent concentration ratio and crosslinking time were EDC/NHS 1:1 and 2 h, respectively. The immobilized materials were characterized by FT-IR, XRD, SEM and VSM. The saturation magnetization of the prepared magnetic nanoparticles was 46.2 emu/g. The optimum pH and temperature of immobilized enzyme were 6 and 60 °C. The application of immobilized enzyme in the preparation of hesperidin dihydrochalcone glucoside (HMGDC) by hydrolysis of hesperidin dihydrochalcone (HSDDC) was studied. The results showed that immobilized enzyme had better temperature resistance, repeatability and stability than free enzyme. The immobilized enzyme activity was 293.55 U/g, and the recovery was 116.03%. After treatment at 60 °C for 4 days, the enzyme activity remained at 24.6%. The conversion rate of HSDDC reached 93.1%.
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Energy & Environmental Materials
·
2021
·Vol. 6
·期 1
·e12254
·
IF 15.122
Ailin Li,Jian Xiong,Ye Liu,Liming Wang,Xiaohong Qin,Jianyong Yu
MIL-101(Cr) is a promising moisture absorbent for solar-driven water harvesting from moisture to tackle the worldwide water shortage issue. However, the MIL-101(Cr) powder suffers from a long ab/desorption cycle due to the crystal aggregation caused by its inherent powder properties. Here, we demonstrate a MIL-101(Cr) nanofibrous composite membrane with a nanofibrous matrix where MIL-101(Cr) is monodisperse in the 3D porous nanofibrous matrix through a simple spray-electrospinning strategy. The continuous porous nanofibrous matrix not only offers sufficient sites for MIL-101(Cr) loading but also provides rapid moisture transport channels, resulting in a super-rapid ab/desorption duration of 50 min (including an absorption process for 40 min and a desorption process for 10 min) and multicycle daily water production of 15.9 L kg −1 d −1 . Besides, the MIL-101(Cr) nanofibrous composite membrane establishes a high solar absorption of 92.8%, and excellent photothermal conversion with the surface temperature of 70.7 °C under one-sun irradiation. In addition, the MIL-101(Cr) nanofibrous composite membrane shows excellent potential for practical application due to its flexibility, portability, and use stability. This work provides a new perspective of shortening MOF ab/desorption duration by introducing a porous nanofibrous matrix to improve the specific water production for the solar-driven ab/desorption water harvesting technique.
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INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2023
·Vol. 24
·期 14
·11480
·
IF 5.6
Wei Mao,Jiawen Hao,Lingyu Zeng,Hao Wang,Hao Xu,Jinghong Zhou
Herein, we report the synthesis of bimetal–organic frameworks (BMOFs) with both Brønsted and Lewis acidities, in which phosphotungstic acid (PTA) was encapsulated in BMOFs. It is efficient in converting starch to 5-hydroxymethyl-furfural (HMF) in deep eutectic solvents (DESs) such as choline chloride and formic acid. The highest yield of HMF (37.94%) was obtained using P0.5/BMOFs1.0to catalyze starch in a mixed solvent system comprising DESs and ethyl acetate (EAC) (v/v; 2:3) at 180 °C and a reaction time of 10 min. Employing a DES as a cocatalyst and solvent reduced the use of organic solvents. The catalyst showed adequate reusability, and the HMF yield only decreased by 2.88% after six cycles of reuse compared with that of the initial catalyst. This study demonstrates the application potential of BMOFs in the conversion of biomass to useful molecules with commercial and/or research value.Keywords:bimetal–organic frameworks;phosphotungstic acid;loading;cassava starch;catalysis
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Analytical Methods
·
2019
·Vol. 11
·期 27
·3467-3473
·
IF 2.378
Zhiyang Lv,Cheng Yang,Yuehong Pang,Weiying Xie,Xiaofang Shen
Dispersive solid phase extraction (d-SPE) is a preponderant methodology featuring direct contact and interaction between adsorbents and analytes. Herein, we used the porous metal–organic framework (MOF) MIL-101(Cr) as a d-SPE adsorbent for pretreatment of edible oil samples and determination of benzo[a]pyrene (BaP). The samples after treatment are applied to determination by high performance liquid chromatography coupled with a fluorescence detector (HPLC-FLD). We optimized the type and dosage of the MOF, diluent and eluent. Under the optimized conditions, this method gave a linear calibration curve for the determination of BaP in the range of 1–30 ng mL−1 (R2 = 0.9958) and the relative standard deviation (RSD) ranged from 1.07 to 8.14% (n = 6). The limit of detection was 0.19 ng mL−1 (S/N = 3) and the recoveries from different types of spiked oil samples were between 88.8 and 118.8%. Compared with conventional methods, the MOF-based d-SPE reduces organic solvent consumption and simplifies operation, which provides potential for application in extraction of hydrophobic targets from oil complexes.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2018
·
IF 2.829
Mingjuan Han,Ying Li,Zheng Gu,Huali Shi,Chong Chen,Qiang Wang,Hui Wan,Guofeng Guan
A novel functionalized MOF heterogeneous catalyst (MIL-101(Cr) @MBIAILs), 2-Mercaptobenzimidazole ILs with electron-rich SH groups immobilized onto the surface of the well-defined MIL-101(Cr) frameworks, was constructed and fabricated by the S Cr coordination bond on the basis of the facile post-synthetic modification strategy. The heterogeneous catalyst was measured by XRD , FTIR, SEM, TEM , TGA , EA and N 2 adsorption–desorption, and the catalytic behavior of the catalyst was assessed by the esterification about oleic acid and methanol as a model reaction. The results showed that MBIAILs have been successfully immobilized onto the surface of MIL-101(Cr) frameworks by S Cr coordinate bonds. More importantly, the conversion of oleic acid just decreased from 91.0% to 82.1% when the catalyst had been reused six times. This exhibited the prepared catalyst had superior catalytic behavior and excellent reusability.
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