INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Jingyu Cai,Junjie Shi,Jian Zhang,Xiaoyu Miao,Sen Wang,Longqiang Xiao,Dan Liu,Linxi Hou
Electronic-grade isopropyl alcohol is widely utilized in the cleaning of semiconductors and microelectronic components. Removing ions like Pb2+ is crucial since the presence of impurities may cause degradation of electronics, increased failure rates, and short circuits. Membrane materials offer a number of advantages in the field of adsorption separation; however, the lack of adsorption sites results in limited adsorption capacity. In the current work, guanidino-grafted NH2-MIL-101(Fe) was incorporated into polyvinylidene fluoride (PVDF) to prepare MOF/PVDF mixed matrix membranes (NM/PVDF) for the removal of Pb2+ from isopropanol. Benefiting from the larger specific surface area and more lone electron pairs in the guanidine group, the Pb2+ adsorption capacity of the as-prepared NM/PVDF membrane was 29.4458 mg/g, which was higher than that of the NH2-MIL-101(Fe)/PVDF membrane (20.9306 mg/g) and the pure PVDF membrane (6.7324 mg/g). The NM/PVDF membrane was able to reduce the concentration of Pb2+ from 500 to 86.73 ppb. This work highlights the potential of guanidine-grafted Fe-based MOFs/PVDF membranes as adsorbents for acquisition of electronic-grade solvents.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Junkang Guo,Xiaohu Fan,Jiayuan Wang,Shenghui Yu,Minwang Laipan,Xinhao Ren,Chao Zhang,Lei Zhang,Yongtao Li
The design and synthesis of efficient adsorbents for recovery of precious metal from secondary resources are of great environmental and economic significance. In present study, an efficient and redox-active adsorbent (UiO-66-BTU) was fabricated by modifying Zr-MOF (Zirconium-based Metal Organic Framework) with bisthiourea for gold recovery in aqueous solution. It is indicated that Au(III) adsorbing onto UiO-66-BTU is an irreversible, favorable chemisorption process conformed to D-R model and pseudo-second-order model. The UiO-66-BTU showed significant adsorption ability (680.20 mg/g at pH 2.0) and high selectivity towards Au(III) in presence of various mixed ions in actual wastewater, which were mainly attributed to the Lewis soft–soft interaction, ion-exchange/electrostatic interactions, and redox reaction between Au(III) and S-containing functional groups. Notably, we demonstrated that the reduction of Au(III) to metallic gold as a dominant recovery mechanism involving the in situ confined nucleation, fusion and growth of AuNPs to branched Au precipitation, with Au(0) accounted for approximately 80% for the recycling products. Furthermore, the UiO-66-BTU membrane achieved similar high adsorption capacity and the membrane surface remains active to efficiently recovered metallic particles with an excellent repeatability at eight cycles of adsorption. The reduced Au particles formed isolated clusters with bigger size and regular hexagonal shape. Consequently, UiO-66-BTU has great potential for gold recycling in industrial practice.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Junyan Liu,Liting Xu,Xingwei Li
Supports play a key role in the performance of platinum-based catalysts. In this work, using NH 2 -MIL-125 as the precursor, mixed-phase TiO 2 coated by nitrogen-doped carbon (TiO 2 @NC) is successfully prepared, and used to support platinum (Pt/TiO 2 @NC) for methanol oxidation reaction. In 0.5 M H 2 SO 4 solution containing 0.5 M CH 3 OH, the area specific activity of Pt/TiO 2 @NC catalyst (1.186 mA cm -2 Pt) is 4.4 times that of commercial Pt/C (0.272 mA cm -2 Pt). At a fixed potential of 0.15 V (vs. Hg/Hg 2 SO 4 ), the current density of Pt/TiO 2 @NC is still 3.6 times that of Pt/C after 3600 s of polarization. Meanwhile, Pt/TiO 2 @NC has also a low tafel slope, a large exchange current density and a high charge transfer coefficient. A large number of Ti-OH groups can alleviate poisoning effect caused by the produced "CO ads " intermediate during methanol oxidation reaction. Nitrogen-doped carbon not only improves the conductivity of TiO 2 support, but provides strong anchor sites for the nucleation of Pt nanoparticles , resulting in an enhanced catalytic activity of Pt/TiO 2 @NC.
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Frontiers of Chemical Science and Engineering
·
2022
·Vol. 16
·期 9
·1387-1398
·
IF 4.803
Han Yuyao,Xia Lei,Zhuang Xupin,Liang Yuxia
UiO-66-NH 2 is an efficient material for removing pollutants from wastewater due to its high specific surface area, high porosity and water stability. However, recycling them from wastewater is difficult. In this study, the cellulose nanofibers mat deacetylated from cellulose acetate nanofibers were used to combine with UiO-66-NH 2 by the method of in-situ growth to remove the toxic dye, rose bengal. Compared to previous work, the prepared composite could not only provide ease of separation of UiO-66-NH 2 from the water after adsorption but also demonstrate better adsorption capacity (683 mg·g −1 ( T = 25 °C, pH = 3)) than that of the simple UiO-66-NH 2 (309.6 mg·g −1 ( T = 25 °C, pH = 3)). Through the analysis of adsorption kinetics and isotherms, the adsorption for rose bengal is mainly suitable for the pseudo-second-order kinetic model and Freundlich model. Furthermore, the relevant research revealed that the main adsorption mechanism of the composite was electrostatic interaction, hydrogen bonding and π — π interaction. Overall, the approach depicts an efficient model for integrating metal-organic frameworks on cellulose nanofibers to improve metal-organic framework recovery performance with potentially broad applications.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Hongying Cheng,Song Liu,Cuiying Hu,Hongxia Wang
A novel flower-like film composed of uniform hollow TiO 2 -NH 2 nano-shell (HTNs), luminol and aniline was synthesized by electro-copolymerization method in acidic ionic liquid EmimCl (IL, 1-ethyl-3-methylimidazolium chloride). The surficial morphology of the film was characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), selected-area electron diffraction (SAED) and atomic force microscope (AFM), which showed the polycrystalline property. Its copolymerization mechanism was discussed in detail, which presented symmetric arrangement. The most obvious multiple increase of peak current in CV indicated the conjugate of HTNs in luminol structure and in aromatic ring skeleton. This film with excellent electrocatalysis performance used for nonelectroactive acetochlor (ACT) detection showed the lowest catalytic potential. Some important parameters were optimized for a homogeneous film and for a sensitive detection. On the optimum film, the electrocatalysis sensor exhibited a linear response within the concentration range of ACT from 2.0×10 −7 M to 1.5×10 −5 M, and an absolute detection limit of 0.15×10 -9 M at a signal-to-noise ratio of 3. Then the proposed method was used for the detection of ACT residue in the real strawberry sample with good results. The promising sensor presents good reproducibility and stability, providing a new fast and sensitive method for the analysis of real samples in environment.
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JOURNAL OF MEMBRANE SCIENCE
·
2019
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IF 7.015
Jiaqi Wang,Yuqing Zhang,Ying Wang,Shuai Sun
To efficiently clean oily wastewater with the linear anion polyacrylamide (APAM), selective adsorption strategy belonging to phase equilibrium separation is introduced into the membrane separation . Herein, bimetallic Ce-UiO-66-NH 2 /diatomite (CUD) were first synthesized by a one-step hydrothermal method and then employed as a functional layer to form CUD self-assembled membrane (CSA-membrane). CUD particles were characterized by FT-IR, XRD and SEM, and CSA-membrane was observed by SEM. The separation and the selective adsorption properties of CSA-membrane formed under the optimum conditions for APAM in oily wastewater were investigated. The results demonstrate that the size of CUD particles with proper sphericity is mainly 20 μm. Furthermore, CSA-membrane simultaneously exhibits fascinating separation and selective adsorption properties for cleaning oily wastewater, namely the concentration of oil decreases from 78.1 mg L -1 to 6.8 mg L -1 , and flux of CSA-membrane reaches 789.5 L m -2 h -1 . Remarkably, the adsorption capacity of CSA-membrane for APAM is 161.5 mg g -1 , while showing the APAM removal rate of 51.3%. Therefore, CSA-membrane with the synergetic effect of phase equilibrium and rate separation is promising alternative for cleaning oily wastewater with APAM.
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JOURNAL OF HAZARDOUS MATERIALS
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2022
·
IF 14.224
Zhikun Huang,Haojie Yu,Li Wang,Xiaowei Liu,Shuning Ren,Jinyi Liu
Designing graphitic carbon nitride (CN) based heterostructured photocatalysts with high catalytic activity is highly desired for peroxymonosulfate (PMS) activation to degrade organic pollutants from water. Herein, a novel heterostructured composite (U-F@CN) consisting of ferrocene-modified Uio-66-NH 2 (U-F) and CN was synthesized. The U-F@CN exhibited superior photocatalytic performance to degrade bisphenol A (BPA) in the presence of PMS under visible light. The experimental results indicated that BPA could be removed entirely by U-F@CN within 60 min under visible light irradiation. In addition, the outstanding photocatalytic activity could be maintained at high level in a wide pH range, appropriate temperature region and natural water condition. Benefiting from the good chemical stability, outstanding optical property and in-situ generation of interfacial heterojunction of U-F@CN, the interfacial transport of photogenerated charges could follow the Z-scheme mechanism, which can accelerate the charge separation and transport to yield abundant reactive active species (ROS) to efficiently active PMS and under visible light. This work provides a novel approach to design CN-based heterostructured photocatalysts with high stability and superior photocatalytic activity for environmental remediation.
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JOURNAL OF MATERIALS RESEARCH
·
2025
·
IF 2.9
Yang Wen,Wang Yujia,Gao Na,Zhu Zhengfa,Chen Yuanyuan,Wang Hao,Tang Xiaoning
Designing efficient visible light-driven photocatalytic antimicrobial agents presents significant challenges. In this study, S-shaped core–shell NH 2 -MIL-125/TiO 2 (NT-x) heterojunctions were constructed by simple in situ solvothermal method, as photocatalytic antimicrobial agents for efficient bactericidal use under visible light. Notably, 99.99% inhibition was achieved for both Escherichia coli and Staphylococcus aureus at low concentrations (0.02 and 0.035 mg mL −1 , respectively) after exposure to simulated sunlight for 20 min. Reasonable energy band configuration and built-in electric field of this structure provided improved photogenerated carrier transfer paths as well as enhanced separation and transport efficiency. Moreover, the core–shell structure enhanced the interaction between NH 2 -MIL-125 and TiO 2 , increased the total number of reactive sites, and promoted the efficient generation of reactive oxygen species. Finally, possible mechanisms for the inactivation of bacteria were discussed. This research offers new perspectives for the advancement of advanced metal–organic framework-based photocatalysts with antibacterial activity under visible light. Graphical abstract
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Chunlei Wang,Dawei Ji,Xuyong Tian,Hongye Lv,Xiuping Li,Tai Zhang,Haolong Xue,Chun Wang,Jingjing Yan,Changfa Xiao
Doping metal-organic frameworks into the casting solution is a common method for preparing mixed matrix membranes. However, metal-organic frameworks are prone to agglomeration and poor dispersion. This can lead to a decline in membrane performance. To address these issues, this work proposed “co-solvent synthesis and in-situ doping” strategy. In this strategy, N,N-Dimethylformamide, which was also the solvent in the casting solution, was chosen as the synthesis carrier for ZIF-8-NH 2 nanoparticles. The prepared ZIF-8-NH 2 suspension could be directly doped into the casting solution in situ. This process eliminated the drying and pre-dispersion steps. Research showed that with 0.5 wt% ZIF-8-NH 2 , the membrane's hydrophilicity significantly improved, with the water contact angle of 72.5°. The pure water flux reached 229 Lm −2 h −1 . Moreover, the retention rates of Congo Red and NaCl were 97.3 % and 3.5 % respectively, demonstrating excellent dye/salt separation. In particular, the flux recovery rate was maintained at more than 91 %, demonstrating good anti-fouling performance. This work provides a promising technical strategy for the efficient treatment of textile dyeing wastewater and resource recovery.
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ACS Omega
·
2025
·
IF 4.3
Dandan Hao,Bing Yu,Tong Zhao,Meisi Chen
In response to the pollution of airborne inhalable particulate matter (PM) and the demand for high-efficiency, low-resistance filtration materials, this study prepared a CS/NP-2.5 paper-based filter by incorporating NH2-MIL-53 into pulp fibers and introducing chitosan (CS) as a carrier. Characterization results show that the composite material forms a complex three-dimensional network structure, significantly enhancing PM capture efficiency. The removal rates for PM2.5 and PM10 reached 98.41% and 99.05%, respectively, with a pressure drop of only 24.10 Pa, which is an improvement of approximately 7% compared to the directly doped NP-2.5 (PM2.5 removal rate of 91.57%). CS enhanced the loading stability of the MOFs on the fibers; after 10 cycle tests, the filtration efficiency was still maintained above 94%, demonstrating excellent reusability. This study, through green synthesis and functional synergy, provides a new approach for the design of high-efficiency paper-based filtration materials.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2025
·
IF 8.4
Soodamani Periyasamy,Jun Hou,Yang Li,Natrayasamy Viswanathan,Zijun Yang,Guoxiang You,Jun Wu,Zhaoqin Huang
This study focuses on the fabrication of an effective heterojunction composite, CoTiO 3 /Cu-BDC-NH 2 MOF (CT@CuMOF) prepared for TC and Cr(VI) removal from water through a synergistic adsorptive-photocatalytic degradation process. CT@CuMOF composite exhibited maximum removal of 21.4 mg/g for TC and 42.1 mg/g for Cr(VI) under dark equilibrium, and visible light irradiation led to 72 % TC and 80 % Cr(VI) degradation within 30 min. VB-XPS results confirmed the alignment of band edges, supporting an S-scheme charge transfer mechanism between the p-type CT and n-type CuMOF. TEM results reveled a well-formed p-n heterojunction, while EIS and photocurrent density measurements demonstrated enhanced charge carrier mobility and separation. Kinetic results followed pseudo-second order for TC and Cr(VI), with Langmuir adsorption isotherm showing maximum capacities of 25.36 mg/g for TC and 45.94 mg/g for Cr(VI). ESR and radical scavenger studies confirmed hydroxyl (•OH) and superoxide (•O 2 − ) radicals as key species in TC degradation, while superoxide played dominant roles in Cr(VI) reduction. CT@CuMOF composite exhibited favorable thermodynamic conditions (ΔG° <0), endothermic processes (ΔH° >0) and excellent reusability (80 % retention after five cycles). This research highlights the novelty of CT@CuMOF composite as a sustainable material for water purification.
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MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 7
·1-10
·
IF 5.3
Chen Fei,Wang Xiang,Yan Lei,Lin Zhixiong,Zheng Weijun,Wu Dianming,Qiu Bin,Fang Yifan,Liu Mingkun
By preparing gold nanoparticles-graphdiyne (Au-GDY) as sensing substrate and [Ru(NH 3 ) 6 ] 3+ -UiO-66-NH 2 MOFs (Ru-UiO-66) as signaling probe as well as linking the as-prepared Au-GDY and Ru-UiO-66 with the specific peptide (PT) of MMP-7 to form Ru-UiO-66/PT/Au-GDY, a cost-effective and sensitive electrochemical sensor was designed for the detection of matrix metalloproteinase-7 (MMP-7) which is an important biomarker for tumor and biliary atresia. The superior electrical properties, easy preparation, large surface area, and high stability of Au-GDY make it be a desirable substrate to immobilize PT. The unique structure of UiO-66-NH 2 is beneficial to assemble [Ru(NH 3 ) 6 ] 3+ probe and link PT. In the absence of MMP-7, the Ru-UiO-66/PT/Au-GDY modified electrode exhibited a prominent peak current of [Ru(NH 3 ) 6 ] 3+ , which is decreased after the addition of target MMP-7 since it can specifically recognize and cleave PT to induce the Ru-UiO-66 leave the electrode. The experimental results showed that the decrease of the [Ru(NH 3 ) 6 ] 3+ signal has a linear relation with the concentrations of MMP-7 in the range 0.01 pg mL −1 –10.0 ng mL −1 . By optimizing experimental conditions, the achieved detection limit (LOD) for MMP-7 is 5.0 fg mL −1 . The analysis of real serum samples has excellent accuracy. The simplicity of preparation and sensitivity make the Ru-UiO-66/PT/Au-GDY sensor a considerable promising analysis tool for MMP-7 detection. Graphical abstract
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