Display omitted
•MIL-88A, as a visible-light-driven photo-Fenton catalyst, was prepared successfully at room temperature.•The size of the MIL-88A can be tuned by controlling the concentrations of ...reactants.•The role of water played in the room-temperature preparation process was discussed.•The as-prepared MIL-88A exhibited excellent photo-Fenton catalytic performance toward RhB and BPA.•The main active specie, degradation mechanism and BPA degradation pathway were proposed.
MIL-88A, a Fe-based MOF, with different sizes was prepared successfully at room-temperature, which was characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and UV–vis diffuse reflectance spectroscopy (UV–vis DRS). Water played an important role in the room-temperature synthesis as water could facilitate the deprotonation of fumaric acid and hydrolysis of iron salt to accelerate crystal nucleation, and this room-temperature preparation is beneficial to the large-scale synthesis and is imperative to push forward the development of the MIL-88A. The as-prepared MIL-88A exhibited excellent photo-Fenton catalytic performance towards rhodamine B and bisphenol A removal under visible light irradiation (LED). The main active specie was investigated, the degradation mechanism and BPA degradation pathway were proposed. Furthermore, the as-prepared MIL-88A displayed good reusability, and there was no obvious decline of degradation performance after five cycles.
Series MIL-53(Fe)/Bi12O17Cl2 (MBx) composites were constructed via facile ball-milling treatment of the MIL-53(Fe) octahedrons and Bi12O17Cl2 nanosheets. The addition of a specific quality of ...Bi12O17Cl2 was in favor of strengthening the transfer ability of photo-generated charge carriers in the composites, thereby further enhancing the photocatalytic performance. Being compared with pristine MIL-53(Fe) and Bi12O17Cl2, the MBx composites exhibited superior white-light-driven Cr(VI) photoreduction performance. The optimal MB100 photocatalyst displayed the best photocatalytic activity, in which 99.2% Cr(VI) can be eliminated within 90 min under white light illumination. Under the identical reaction conditions, it achieved 42.9% and 76.5% higher improvements as those of pure MIL-53(Fe) and Bi12O17Cl2. More than that, the MB100 also demonstrated good stability even after four cycles of testing experiments. At last, the corresponding reaction mechanism was clarified based on the electrochemical analysis and electron spin resonance (ESR) data. Such heterogeneous photocatalyst design strategy based on Fe-MOFs and bismuth-rich bismuth oxyhalides might provide new insights for treating Cr-containing wastewater.
MIL-53(Fe)/Bi12O17Cl2 (MBx) composites constructed by ball-milling method exhibit remarkable photocatalytic activities toward Cr(VI) reduction. Display omitted
•MIL-53(Fe)/Bi12O17Cl2 (MBx) composites were constructed by ball-milling method.•The composites exhibited good Cr(VI) photoreduction performances under white light.•Z-scheme mechanism of Cr(VI) photoreduction over MB100 was put forward in this study.
Development of new self-calibrating fluorescent sensing methods has been a popular research field with the aim of protecting the human health and environment sustainability. In this work, a novel ...Eu-based metal organic framework (MOF) Eu(2,6-NDC)(COO) (BUC-88) was developed by employing 2,6-NDC (2,6-naphthalenedicarboxylic acid) as bridging ligands. BUC-88 performed different sensing process toward quinolone antibiotics and tetracyclines antibiotics in terms of fluorescence intensity and color. BUC-88 exhibited excellent selectivity and sensitivity detection property toward enrofloxacin (ENR), norfloxacin (NOR) and ciprofloxacin (CIP) over other Pharmaceutical and Personal Care Products (PPCPs), accomplishing the detection limit of 0.12 µmol/L, 0.52 µmol/L, 0.75 µmol/L, respectively. Notably, BUC-88 acted as an excellent fluorescence sensor for tetracyclines antibiotics with fast response time (less than 1 s), high selectivity and sensitivity (LODs = 0.08 µmol/L). The fluorescent detection method was successfully used for visual and ultrasensitive detection of ENR, NOR, CIP and tetracycline hydrochloride (TC) in lake water with satisfied recovery from 99.75% to 102.30%. Finally, the photoinduced electron transfer and the competitive absorption of ultraviolet light are the main mechanisms for sensitive detection toward quinolone antibiotics and tetracyclines antibiotics.
A new 3D Eu-MOF (BUC-88) was used as fluorescence sensor to detect quinolone antibiotics and tetracycline antibiotics in aqueous solution. The mechanism of fluorescent sensing toward quinolone antibiotics and tetracycline antibiotics was proposed and verified. Display omitted
Display omitted
•The MOF-nanoparticle (UiO-66-NH2/Ag3PO4) composites was facilely fabricated.•The light-responsive MOF-NP composites for SMX capture and release was reported.•The SMX release from ...composites was controlled by the size of nano-Ag3PO4 on MOF.•Mechanism of the light-triggered SMX release was clarified.
Light-responsive materials are attracting increasing amount of attention and have great potential in many research fields in environmental chemistry, materials science, biology, and nanotechnology. In this work, UiO-66-NH2/Ag3PO4 (UAP-X) Metal-organic framework (MOF)-nanoparticle composites with remarkable adsorption performance toward sulfamethoxazole (SMX) were reported. In addition, visible light-triggered release of SMX in the UAP-X composites was reported for the first time. It is believed that the light-triggered desorption of SMX is due to the transformation from Ag+ to Ag0 in the light-sensitive Ag3PO4 nanoparticles (NPs) of the composites. The SMX release performance of UAP-X can be tuned by the size of Ag3PO4 NPs distributed on the UiO-66-NH2. Specifically, the smaller crystal size of Ag3PO4 NPs, which can facilitate the reduction of Ag+ to Ag0, can be achieved with an increase in relative UiO-66-NH2 content in the composites. In addition, the higher UiO-66-NH2 content of the composite could provide more deposition area to minimize the aggregation of Ag3PO4, which could further enhance the reduction of Ag+. The light triggered desorption provides new possibility to achieve pollution-free and low-cost recyclability of adsorbents.
MOFs for water purification Fu, Huifen; Wang, Chong-Chen; Liu, Wen
Chinese chemical letters,
04/2022, Letnik:
33, Številka:
4
Journal Article
Recenzirano
This Editorial introduces the recent advances of MOFs for pollutant detection in water and water purification by adsorption and catalysis reported in Chinese Chemical Letters in the past five years. ...Display omitted
The Ag/Ag3PO4/MIL-125-NH2 (AAMN-X) Z-scheme heterojunction displayed outstanding photocatalytic activity due to that Ag nanoparticles act as electrons transfer bridge to enhance the separation of ...photoinduced electrons and holes.
Display omitted
The binary Ag3PO4/MIL-125-NH2 (AMN-X) composites were synthesized through ion exchange-solution method, and the ternary Ag/Ag3PO4/MIL-125-NH2 (AAMN-X) Z-scheme heterojunctions were prepared via the photo chemical reduction deposition strategy. The photocatalytic hexavalent chromium (Cr(VI)) sequestration over AMN-X and AAMN-X were investigated under visible light. AAMN-120 accomplished superior reduction performance due to that Ag nanoparticles (NPs) act as electrons transfer bridge to enhance the separation efficiency of photogenerated e−-h+ pairs, in which the reaction rates (k value) were 2.77 and 124.2 fold higher than those of individual MIL-125-NH2 and Ag3PO4, respectively. The influences of different pH values, small organic acids and coexisting ions on the photocatalytic performance of AAMN-120 were also investigated. In addition, the AAMN-120 heterojunction expressed great reusability and stability in cycling experiments. The mechanism of photocatalytic Cr(VI) was investigated and verified through photoluminescence (PL), electrochemistry, electron spin resonance (ESR), active species capture, and Pt element deposition experiments.
A facile strategy was adopted to prepare porous Cd
0.5
Zn
0.5
S (CZS-X) nanocages by sulfurizing the rhombic dodecahedral ZIF-8 as precursor with thioacetamide (TAA) at different durations (0, 1, 3, ...5 h), in which the fabrication mechanism of the porous CZS-X nanocages was clarified. The photocatalytic activities of CZS-X for Cr(VI) elimination and organic pollutant decomposition were assessed. The results revealed that CZS-3 exhibited optimal photocatalytic activity under visible light along with satisfied recyclability and stability after several runs’ operation. As well, the CZS-3’s photocatalytic cleanup abilities toward both Cr(VI) and organic pollutants were explored in different actual water bodies to clarify the influence of different foreign ions. Finally, the intrinsic photocatalysis mechanism of CZS-X was verified.
MIL-68, a typical In-based MOF, has been studied in many fields due to its excellent performance. Facile preparation of MIL-68, suitable for scalable preparation and industrial applications, is of ...great significance. In this work, a method for the room-temperature preparation of rod-like MIL-68 at the nano- and micro-scales was developed for the first time, in which water or salts such as NaF, sodium formate, sodium acetate and sodium propionate were used as modulating reagents. It appears that these modulating reagents can promote the deprotonation of terephthalic acid and the hydrolysis of indium salt to accelerate crystal nucleation. The size of MIL-68 can be controlled by changing the modulating reagents. Hollow porous In2S3 particles composed of assembled ultrathin nanosheets were obtained via sulfidation treatment using MIL-68 as a self-sacrifice template, and the obtained In2S3 exhibited excellent photocatalytic activity toward Cr(VI) reduction and methyl orange degradation under LED visible light irradiation. Furthermore, the photocatalytic mechanism and reusability were studied.
Display omitted
•A facile preparation method of MIL-68 was developed using water or salts as modulating reagents.•The sizes of MIL-68 can be controlled by changing the modulating reagents.•Hollow In2S3 with assembled ultrathin nanosheets derived from MIL-68 was obtained.•The In2S3 exhibited excellent photocatalytic performance under LED visible light.•The photocatalytic mechanism was proposed.
Arsenic contamination has attracted worldwide concerns, owing to its toxicity and severe threat to human and environment. It is urgent to develop efficient adsorbents to remove arsenic pollutants. ...Within this paper, both pristine MIL-88A(Fe) and MIL-88A(Fe) decorated on cotton fibers were successfully fabricated using an eco-friendly method. The pristine MIL-88A(Fe) displayed outstanding adsorption performances towards four selected arsenic pollutants, in which the adsorption capacities toward As(III), As(V), ROX and ASA were 126.5, 164.0, 261.4 and 427.5 mg g−1, respectively. Additionally, MIL-88A(Fe) exhibited excellent removal efficiencies in a wide pH range and with the presence of different co-existing ions. It was proposed that the coordinative interactions of As–O–Fe between arsenic pollutants and MIL-88A(Fe) contributed to the superior adsorption performances. Furthermore, two MIL-88A(Fe)/cotton fibers composites were synthesized by both post synthesis (MC-1) and in-situ synthesis (MC-2), which demonstrated identically outstanding adsorption activities toward four selected arsenic pollutants. MC-1 and MC-2 enhanced the stability and reusability of MIL-88A(Fe), which was challenging issues of pristine MIL-88A(Fe) powder. Additionally, the fixed-bed column packed by MC-1 or MC-2 can continuously eliminate arsenic pollutants from the water flow. This work provided a new possibility of metal-organic frameworks to accomplish potentially large-scale application to purify the arsenic-contaminated water.
Display omitted
•MIL-88A(Fe) exhibits excellent adsorption abilities toward different arsenics.•MIL-88A(Fe) decorated on cotton fibers maintains outstanding adsorption activities.•The combination of MIL-88A(Fe) and cotton fibers improves its stability.•MIL-88A(Fe) decorated on cotton fibers achieves good reusability.•MIL-88A(Fe) decorated on cotton fibers exhibits potential large-scale application.
The CoSx-CuSx was firmly immobilized on copper foam (CF) substrate to fabricate supported CoSx-CuSx/CF using ZIF-L(Co)/CF as a self-sacrificing template, in which CF substrate played an important ...role in improving the adhesion between CF and target catalyst as well as the interfacial interaction between CoSx and CuSx. The CoSx-CuSx/CF performed well in catalytic peroxymonosulfate (PMS) activation, which can accomplish 97.0% sulfamethoxazole (SMX) degradation within 10 min due to the special structure and Co2+ regeneration promoted by S2- and Cu+. The influences of pH, PMS dosage, catalyst dosage, co-existing anions and natural organic matter (NOM) on SMX removal were studied in detail. CoSx-CuSx/CF presented excellent catalytic activity and reusability, which might be fascinating candidate for real wastewater treatment. The possible pathway of SMX degradation was proposed, and the toxicity of the intermediates during the degradation process were evaluated. It is noteworthy that long-term continuous degradation of sulfonamide antibiotics was achieved using a self-developed continuous-flow fixed-bed reactor. This work demonstrated that CF as a substrate to fabricate supported catalysts derived from MOF had great potential in actual wastewater remediation.
Display omitted
•Supported CoSx-CuSx/CF was synthesized using a self-sacrificing method.•CF played a vital role in improving the stability and developing of interfacial interaction.•The regeneration of Co2+ by superficial S and Cu+ species led to the superior SR-AOP activity.•CoSx-CuSx/CF displayed excellent stability and reusability due to the immobilization of CF.•A self-developed fixed-bed reactor was used for sulfonamide antibiotics degradation.
