Desalination and Water Treatment
·
2024
·
IF 1
Hui Huang,Bin Huang,Yichun Huang,Jinbei Yang,Yinnv Ye,Yucheng Chen
Attractive environmentally friendly magnetic metal-organic framework (MOF) nanocomposite GO@Fe 3 O 4 -COOH@NH 2 -MIL-101(Fe) was synthesized by a solvothermal method and characterized by X-ray diffraction, Fourier transform infrared, scanning electron microscopy, Brunauer– Emmett–Teller, and vibrating sample magnetometer, and used as an effective adsorbent for the removal of orange G from aqueous solution. The various operating parameters that effect the adsorption process, such as adsorbent dosage (0.01–0.2 g), pH (1.0–10.0), initial concentration (50–400 mg L –1 ), and temperature (298.15–318.15 K) were studied. The percent removal of orange G increases with the increment of the adsorbent dosage and decrease of the initial concentration, and the optimum pH is 6.0. The Redlich–Peterson model can be favorably applied to describe the adsorption equilibrium data, indicating that the surfaces of GO@Fe 3 O 4 -COOH@NH 2 -MIL-101(Fe) nanocomposite for the orange G adsorption are made up of homogeneous adsorption patches. The adsorption kinetics indicate that the adsorption process of GO@Fe 3 O 4 -COOH@NH 2 -MIL-101(Fe) toward orange G obeys the pseudo-second-order model and the activation energy is 16.5 kJ mol –1 . Thermodynamic parameters, ΔH = 39.81 kJ mol –1 , ΔS = –46.80 J mol –1 K –1 , and ΔG < 0, exhibit that the adsorption is exothermic and spontaneous. The maximum adsorption capacity of orange G onto GO@Fe 3 O 4 -COOH@NH 2 -MIL-101(Fe) nanocomposite is 128.8 mg g –1 . Therefore, magnetic GO@ Fe 3 O 4 -COOH@NH 2 -MIL-101(Fe) nanocomposite can be employed as an environmentally friendly and efficient adsorbent for the orange G removal from wastewater.
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Frontiers in Chemistry
·
2021
·
IF 5.221
Zhang Hui,Zhou Liang,Li Jing,Rong Sijia,Jiang Jianping,Liu Shengquan
Herein, we report a novel carboxymethyl cellulose (CMC)/MIL-101 (Fe)/poly(β-cyclodextrin) (β-CDP) hydrogel with high photocatalytic activity. β-CDP can significantly enhance the photoactivity of MIL-101(Fe) in the hydrogel prepared by a simple solvothermal method. The structure and property of this composite hydrogel were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. Tetracycline was selected as a model pharmaceutical antibiotic to evaluate the photocatalytic activity of the composite hydrogel under visible light irradiation and darkness, respectively. This composite hydrogel shows excellent activity for degrading pharmaceutical antibiotics under visible light irradiation. The increased photocatalytic activity can be attributed to β-CDP, which acts as a promoter and affords an efficient separation of photogenerated electron-hole pairs of MIL-101(Fe). Moreover, the composite hydrogel is shown to have good water retainability. The hydrogel is inexpensive and shows high photocatalytic activity. Hence, it can be used as an efficient photocatalytic material.
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CHEMICAL PAPERS
·
2024
·Vol. 78
·期 6
·3761-3772
·
IF 2.1
Chen Yufeng,Zhao Ning
Surface-enhanced Raman scattering (SERS) has been widely applied in various fields due to its high sensitivity and rapid response capability. In this paper, a MIL-101(Fe)@Ag composite SERS substrate was prepared using photoreduction method. The synthesized MIL-101(Fe)@Ag composite substrate combines the localized surface plasmon resonance properties of silver nanoparticles and the high adsorption capacity of metal–organic frameworks. MIL-101 (Fe)@Ag composite substrate was characterized by FTIR, UV and SEM. The SERS activity of the composite substrates was characterized by measuring the Raman signals of PATP. The detection limit of the substrate for PATP was 10 –8 M, with a relative standard deviation of only about 5.3%, indicating good SERS effect and reproducibility of the substrate. Finally, the prepared substrate was applied for formaldehyde detection, with a detection limit of 10 –9 M. Principal component analysis was used for quantitative analysis of formaldehyde. This work proposes a simple method for synthesizing MIL-101(Fe)@Ag composite substrates with high SERS performance and uniformity and establishes a rapid detection method for formaldehyde using this substrate, which has great application prospects.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2026
·Vol. 37
·期 19
·1512
·
IF 3.2
Jiang Chaojin,Zhang Yuanyuan,Guan Erbu,Jiang Yuqin,Li Shuaishuai,Xin Yanmei
The development of efficient and economical photocatalysts is the focus of achieving sustainable remediation of water pollution. However, slow photogenerated carrier transfer and insufficient catalytic sites are the main reasons affecting photocatalytic applications. Herein, we developed flake-octahedral BiOBr/MIL-101(Fe) heterojunction catalysts through a facile solvothermal strategy for the degradation of pollutants under visible light irradiation. Scanning electron microscope, X-ray photoelectron spectrometer, Fourier infrared spectrometer, and X-ray diffraction analysis characterizations proved the successful synthesis of flake-octahedral BiOBr/MIL-101(Fe) heterojunction. Absorption spectra and Brunauer–Emmett–Teller analyses showed that the BiOBr/MIL-101(Fe) composites with an atomic percentage of Fe of 9.1 (denoted as BiOBr/MIL III ) had the optimal light absorption and the largest specific surface area. The BiOBr/MIL III achieved a remarkable Rhodamine B (Rh B) degradation efficiency of 94.5% within 60 min, with an apparent rate constant ( k ) of 0.03540 min −1 , demonstrating excellent visible light-driven photocatalytic activity. Photocatalytic mechanistic studies showed that the solvothermal-induced flake-octahedral BiOBr/MIL-101(Fe) III heterojunction promotes the formation of Z-scheme, which significantly enhances the carrier separation efficiency and accelerates the rapid generation of reactive radicals · O 2 − and h + . This work provides a feasible strategy for the construction of flake-octahedral inorganic-MIL photocatalysts with excellent photocatalytic performance.
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Huihu Wang,Hao Tu,Feng Chen,Huang Xu,Ziguan Zhang,Guode Chen,Chenhuinan Wei,Xing Xiang,Zhixiong Xie
Through a facile oil bath method, a novel highly dispersed NH 2 -MIL-101(Fe)/carboxylated g-C 3 N 4 (NM-101(Fe)/CCN) heterostructure was prepared using the chemical bonding between carboxyl groups and -NH 2 groups. Compared with the octahedral morphology of pure NM-101(Fe), the chemical bonding interaction promoted the heterogeneous nucleation and growth of NM-101(Fe) to form nanometer-sized granular morphology, which was homogeneously dispersed on CCN surface. Cr(Ⅵ) and ciprofloxacin (CIP) were selected as the typical pollutant models in micro-polluted water sources. The results showed that 10 %NM-101(Fe)/CCN heterostructure could remove 97 % of Cr(Ⅵ) in 60 min and 88 % of ciprofloxacin (CIP) in 120 min. In the dual pollutant system of Cr(Ⅵ) and CIP, Cr(Ⅵ) reduction and CIP degradation can promote each other, and the degradation efficiency of CIP reached 96 % within 120 min. The apparent rate constant of 10 %NM-101(Fe) /CCN heterostructure for Cr(Ⅵ) reduction was 4.30 and 9.67 times of that of NM-101(Fe) and CCN, respectively, which may be ascribed to the interface electric field and good interface bonding of heterojunction . The charges separation efficiency was significantly improved, which effectively enhanced the photocatalytic activity.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Mengting Zhu,Ruli Xu,Xueyang Wang,Jie Liu Qianli Zhang,Jie Wei
Four Fe-based metal-organic frameworks (MIL-101(Fe), MIL-53(Fe), MIL-88(Fe), and MIL-100(Fe)) were synthesized using a solvothermal method, and further characterized by X-ray diffraction, Fourier transforms infrared spectroscopy, Scanning electron microscopy, and X-ray photoelectron spectroscopy. The synthesized Fe-MOFs were used to fabricate the modified carbon paste electrodes (CPE) for simultaneous detection of hydroquinone and catechol. Among the MILs (Fe) modified CPEs, MIL-101(Fe)/CPE exhibited extraordinary electrochemical sensitivity because of MIL-101 (Fe)’s excellent conductivity. The oxidation potential separation of hydroquinone and catechol achieved 190 mV. Compared with CPE, the oxidation currents of hydroquinone and catechol at MIL-101/CPE were 10-fold higher and the reduction currents were 5-fold higher. The linear range was 2 - 90 μM for hydroquinone and 2 - 100 μM for catechol, and the detection limit was 0.58 μM and 0.62 (S/N = 3) μM for hydroquinone and catechol. Furthermore, the application of MIL-101 (Fe)/CPE has been validated in an actual river water sample with the satisfied recoveries of 90.21 - 102.36% and 91.11 - 102.19% for hydroquinone and catechol, respectively.
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INORGANIC CHEMISTRY COMMUNICATIONS
·
2022
·
IF 3.428
Zihao Hu,Huiqi Wu,Fang Zhu,Sridhar Komarneni,Jianfeng Ma
MIL-101(Fe)/Co 3 O 4 composites were synthesized using a facile solvothermal method to establish the superiority of a heterogeneous photochemical catalysis system in the presence of Na 2 S 2 O 8 with visible light irradiation. In the present system, the MIL-101(Fe)/Co 3 O 4 catalyst showed better catalytic performance than the single photocatalytic or chemical catalytic system, implying that the MIL-101(Fe)/Co 3 O 4 catalyst can combine both photocatalysis and chemical catalysis well. When tetracycline (TC) is the target pollutant, the highest degradation efficiency can be achieved within 40 min, reaching to 86 %. Crystallinity, morphology, and elemental valence of the MIL-101(Fe)/Co 3 O 4 composite were explored by using X-ray diffraction (XRD), scanning electron microscopy (SEM) as well as X-ray photoelectron spectroscopy (XPS). From the quenching experiments, it was found that 1 O 2 , SO 4 ‾, OH, and O 2 ‾ make contributions to the effective removal of tetracycline. Apart from that, the recovery and reuse characteristics of MIL-101(Fe)/Co 3 O 4 may facilitate the sustainable wastewater treatment.
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International Journal of Applied Ceramic Technology
·
2022
·Vol. 20
·期 1
·24-38
·
IF 2.328
Cong Zhou,HaiPeng Feng,GuangAo Liu,Feng Tao,Qi Liu
SiFeCO ceramic nanocomposites with porous structure have been successfully prepared via pyrolysis of novel iron-containing precursors, which were synthesized by modification of polycarbosilane with different contents of MIL-101(Fe), a kind of metal-organic framework made by our laboratory. Iron-containing precursors were pyrolyzed at relatively low temperatures ranging from 500 to 900°C under nitrogen atmosphere, the polymer-to-ceramic conversion process were investigated by Fourier transform infrared spectroscopy, X-ray diffraction (XRD), and thermo gravimetric analysis (TGA) measurements. SiFeCO ceramics with different iron contents were intensively studied with respect to their crystallization behavior, microstructure evolution, and porous morphology influenced by additive amount of MIL-101(Fe). The results of XRD and Transmission electron microscopy revealed that MIL-101(Fe)-modified precursors converted into amorphous SiFeCO ceramics when pyrolyzed below 700°C under nitrogen, extremely small Fe 3 O 4 and α-Fe crystallites with grain size of only 2–5 nm were in situ generated and dispersed uniformly in the SiCO ceramic matrix. Simultaneously, interconnected porous structure was created in the matrix by the decomposition of MIL-101(Fe). The as-obtained SiFeCO ceramics could serve as heterogeneous Fenton-like catalysts for the degradation of xylene orange and exhibit outstanding catalytic properties.
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Environmental Science-Nano
·
2022
·Vol. 9
·期 8
·3081-3093
·
IF 9.473
Yuqi Wan,Huaizhi Yang,Qigao Shang,Qingrong Cheng,Hong Zhou,Zhiquan Pan
A novel metal–organic framework@covalent organic framework (MOF@COF) heterojunction was synthesized based on post-synthetic covalent modification. In the present work, aldehyde-modified MOFs (NH2–MIL-101(Fe)) were covalently bonded with covalent organic frameworks (Schiff base network-1, SNW-1) forming the NH2–MIL-101(Fe)@SNW-1 (MS-x) heterojunction by using this strategy. The MS-x heterojunction showed excellent photodegradation ability for pollutants and photocatalytic hydrogen production under simulated sunlight. The superior photocatalytic performance of the MS-x heterojunction can be attributed to the formation of –CN– bonds between NH2–MIL-101(Fe) and SNW-1, which enhances the charge separation efficiency and improves the stability of the photocatalyst. It is worth mentioning that SNW-1 on the surface of the catalyst had a hollow structure which can promote the photoelectric charge migration. Furthermore, the results verified that the matched band structure of NH2–MIL-101(Fe) and SNW-1 could induce a type II heterojunction, which could well explain the improved photocatalytic performance of the photocatalytic system. This work not only provides a new idea to construct highly efficient and stable MOF@COF heterojunctions but also broadens the applications of COF-based materials.
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CHEMOSPHERE
·
2022
·
IF 8.943
Sheng Fan,Xinru Lu,Haoliang Li,Xiaodong Du,Xiaoyu Huang,Yao Ma,Juan Wang,Xueqin Tao,Zhi Dang,Guining Lu
Organophosphate esters (OPEs) are a new class of flame retardants present in diverse waters. The study focused on the removal of aqueous OPEs using functionalized MIL-101(Fe), which was a representative of the metal-organic frameworks (MOFs). Adsorption kinetics of tris(2-chloroethyl) phosphate (TCEP), tributyl phosphate (TnBP), and triphenyl phosphate (TPhP) were investigated. Additionally, TCEP was selected as the model contaminant to study the adsorption isotherms, thermodynamics, and effect of solution matrix properties. Adsorption mechanisms obtained from the experiments were confirmed using density functional theory (DFT) calculations. Adsorption kinetics indicated that functionalized MOFs provided a significant enhancement to the removal of TCEP. The maximum adsorption capacities q m of MIL-101(Fe), MIL-101(Fe)–NH 2 , MIL-101(Fe)–OH, and MIL-101(Fe)–CH 3 at 298 K for TCEP were 76.040, 282.940, 119.680, and 181.274 μmol/g, respectively. By comparing the adsorption behavior of functionalized MOFs, MIL-101(Fe)–NH 2 was proved to be most efficient for TCEP removal . Based on the adsorption experiments and DFT calculations, TCEP removal was dominated by physical adsorption. The van der Waals (vdW) interactions and hydrogen bonding were assumed to be involved in the adsorption. This work proves that appropriate ligand functionalization is promising for the removal of aqueous OPEs, which also provides a new insight for the control of OPEs pollution.
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FIBERS AND POLYMERS
·
2023
·Vol. 24
·期 6
·1983-1994
·
IF 2.5
Feng Jiangli,Sun Hui,Yu Bin,Yang Xiaodong,Xu Lei,Liu Peng,Cui Xiaogang
A kind of NH 2 -MIL-101(Fe)@viscose spunlaced nonwoven material (VSN) was prepared by in situ solvothermal method for the adsorption of organic dyes in wastewater and then carbonized in a tube furnace under N 2 atmosphere at 300 °C to improve the adsorption performances. The results showed that the synthesized NH 2 -MIL-101(Fe) particles with a polyhedral structure were uniformly loaded on the VSN surface. After being carbonized, the NH 2 -MIL-101(Fe)@viscose spunlaced nonwoven porous carbon material (VSNC) were obtained. Compared with uncarbonized NH 2 -MIL-101(Fe)@VSN, the adsorption efficiency of NH 2 -MIL-101(Fe)@VSNC for methylene blue (MB) significantly enhanced and could reach 98.3% under the condition of water bath temperature of 30 °C and pH 9. According to adsorption thermodynamic analysis, the MB adsorption process by NH 2 -MIL-101(Fe)@VSNC was spontaneous. The quasi-secondary adsorption kinetic model was more suitable to describe the whole adsorption process of NH 2 -MIL-101(Fe)@VSNC, implying that the adsorption mechanism of NH 2 -MIL-101(Fe)@VSNC for MB was mainly chemical adsorption. NH 2 -MIL-101(Fe)@VSNC presented good structure stability and reusability during the adsorption process. After being recycled five times, the MB adsorption efficiency still maintained about 86.3%.
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CHEMOSPHERE
·
2021
·
IF 7.086
Liu-Xi Yang,Jia-Cheng E. Yang,Ming-Lai Fu
In this study, porous magnetic CoFe 2 O 4 nanocrystals (NCs) were successfully synthesized by using bimetal-organic framework (MOF) as a precursor, and used as catalysts to activate peroxymonosulfate (PMS) for the removal of chloramphenicol (CAP) in the solution. The structure and physicochemical properties of CoFe 2 O 4 NCs were thoroughly examined by a series of characterization techniques. The results revealed as-synthesized CoFe 2 O 4 had a nanorod-shaped structure with high specific surface area (83.00 m 2 g −1 ) and pore volume (0.31 cm 3 g −1 ). Furthermore, the degradation efficiency (100%) and the removal of total organic carbon (68.09%) were achieved after 120 min with 0.1 g/L CoFe 2 O 4 NCs, 2 mM PMS and 10 mg/L CAP at pH of 8.20. In addition, effects of catalyst dosage, PMS dosage, initial pH values, CAP concentration and co-existing anions as well as natural organic matters in the solution on the degradation efficiencies were studied and all the removal can be well fitted with pseudo-first-order kinetic model (R 2 > 0.96). Sulfate radicals (SO 4 •− ) and hydroxyl radicals (HO•) were proved to be two main reactive species for CAP removal in CoFe 2 O 4 /PMS system based on quenching experiments. CAP was degraded by the main pathways of dichlorination, denitration, decarboxylation , hydroxylation, ring cleavage and chain cleavage on CoFe 2 O 4 /PMS system through high performance liquid chromatograph-mass spectrometry analysis. We believe that this study would be very meaningful to promote the applications of MOFs-derived catalysts on the SO 4 •− based advanced oxidation processes (SR-AOPs) for the environmental remediation.
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