JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
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IF 9.9
Jing Li,Guo Lin,Fangguan Tan,Likang Fu,Biao Zeng,Shixing Wang,Tu Hu,Libo Zhang
In the context of industrialization and severe wastewater pollution, mercury ions pose a major threat due to their high toxicity. However, traditional adsorbents and common metal-organic framework (MOF) materials have limited effectiveness. This study focuses on combining magnetic materials with functionalized titanium-based MOF composite (SNN-MIL-125(Ti)@Fe 3 O 4 ) to improve mercury ion adsorption. Through comprehensive characterization and analysis, the adsorption performance and mechanism of the material were studied. The optimal adsorption of the material was achieved at pH 5, exhibiting a pseudo-second-order adsorption model and the Hill theoretical capacity of 668.98 mg/g. Hill and Tempkin models confirmed the presence of chemical and physical adsorption sites on the material surface. Thermodynamic experiments showed a spontaneous endothermic process. Despite the presence of interfering ions, the material exhibited high selectivity for mercury ions . After four cycles, adsorption performance decreased by only 8%, indicating excellent reusability. Nitrogen- and sulfur-containing functional groups played a key role in mercury ion adsorption. In conclusion, SNN-MIL-125(Ti)@Fe 3 O 4 , as a magnetic MOF adsorption material, showed potential for effective remediation of mercury-contaminated wastewater. This study contributes to the development of efficient adsorption materials and enhances the understanding of their mechanism.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
Chemical Science
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2020
·Vol. 11
·期 15
·3978-3985
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IF 9.346
Jing Cao,Wenjie Ma,Kangjie Lyu,Lin Zhuang,Hengjiang Cong,Hexiang Deng
We report the design and synthesis of a titanium catecholate framework, MOF-217, comprised of 2,4,6-tri(3,4-dihydroxyphenyl)-1,3,5-triazine (TDHT) and isolated TiO6 clusters, with 2-fold interpenetrated srs topology. The dynamics of the organic linker, breaking the C3h symmetry, allowed for reversible twist and sliding between interpenetrated frames upon temperature change and the inclusion of small molecules. Introduction of 28 wt% imidazole into the pores of MOF-217, 28% Im-in-MOF-217, resulted in four orders of magnitude increase in proton conductivity, due to the appropriate accommodation of imidazole molecules and their proton transfer facilitated by the H-bond to the MOF structure across the pores. This MOF-based proton conductor can be operated at 100 °C with a proton conductivity of 1.1 × 10−3 S cm−1, standing among the best performing anhydrous MOF proton conductors at elevated temperature. The interframe dynamics represents a unique feature of MOFs that can be accessed in the future design of proton conductors.
研究领域:
材料科学
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化学
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DOI
PubMed
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
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2020
·Vol. 36
·期 3
·447-452
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IF 1.063
He Yilei,Zhang Xing,Wei Yanze,Chen Xiaoyu,Wang Zumin,Yu Ranbo
Nanostructured N-doped TiO 2 photocatalyst has been prepared via a new approach from Ti-based MOF[NH 2 -MIL-125(Ti)] precursor. The success of N doping enhances light absorption and narrows the bandgap. Moreover, the as-prepared nanostructure is constructed with tiny nanoparticles and resembles a pie-like morphology inherited from the MOF, which accelerates electron transfer. Hence, as a photocatalyst for the degradation of methylene blue(MB) under visible light irradiation, the N-doped TiO 2 (N-TiO 2 ) nanostructure shows higher photocatalytic activity with a reaction rate constant of 0.018 min −1 than that of the TiO 2 -P25 and TiO 2 under the visible light.
研究领域:
材料科学
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环境科学
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化学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Shiben Liu,Xiaohui Jiang,Geoffrey I.N. Waterhouse,Zhi-Ming Zhang,Liang-min Yu
Z-scheme hetero-structured photocatalysts show outstanding photocatalytic activity in many reactions. In this work, a series of novel Z-scheme photocatalysts were fabricated via the photo-reduction of plasmonic sliver nanoparticles on the surface of NH 2 -MIL-125 (Ti)/NiFe layered double hydroxide (Ti-MOF/NiFeLDH) hybrids. The obtained Ti-MOF/Ag/NiFeLDH composites showed excellent photocatalytic performance under visible light, with the Ag nanoparticles facilitating charge transfer across Ti-MOF/NiFeLDH heterojunctions, thus boosting the photocatalytic activity. At an optimized Ag loading, 95% of Rhodamine B (RhB) degradation was achieved within 50 min and 92% Levofloxacin (LVX) degradation within 70 min. The degradation intermediates of LVX were analyzed by LC-MS and the decomposition pathways were proposed. Further, the Z-scheme Ti-MOF/Ag/NiFeLDH photocatalyst demonstrated outstanding reusability and stability in recycling tests (removal efficiencies of 92% for RhB and 90% for LVX after 5 successive test cycles). Trapping experiments revealed that superoxide radicals (•O 2 − ) and hydroxyl radicals (•OH) were two main reactive species formed under visible light, with valence holes (h + ) playing a minor role. Results allowed the mechanisms for antibiotic (i.e. LVX) and dye degradation over Ti-MOF/Ag/NiFeLDH to be proposed. This study introduces a new strategy, the combination of MOFs, LDHs and plasmonic Ag nanoparticles, for fabrication of high-performance Z-scheme photocatalysts for the removal of water pollutants.
研究领域:
环境科学
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材料科学
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化学工程
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DOI
高影响因子
APPLIED SURFACE SCIENCE
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2025
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IF 6.9
Yubo Zhou,Xinbo Zhao,Zan Li,Junchao Yin,Liangmin Yu
To address ion interference in photocatalytic antibiotic degradation within high-salt seawater, this study innovatively designed and synthesized a titanium-based metal–organic framework (MOF) heterojunction composite. Specifically, a solvothermal technique was used to create MIL-125(HAC)/TiO 2 (TAC) photocatalysts using commercial TiO 2 (P25) and MIL-125(Ti) that had been treated with acetic acid. Remarkably, under 60 min of visible-light irradiation, the optimized TAC-2 sample achieved 95.7 % tetracycline (TC) degradation in seawater (compared to 98.1 % in deionized water) and retained >85 % efficiency after four cycles. Critically, its degradation rate constant (k=0.0355 min −1 ) in seawater was 44.4 times higher than that of P25, demonstrating exceptional resistance to salt-ion interference and photocatalytic activity. Mechanistic studies revealed that the performance enhancement arises from three synergistic mechanisms: (1) A mesoporous structure mitigating ion interference and strengthening TC-selective adsorption; (2) A Type-II heterojunction enabling efficient charge separation; (3) •O 2 − and h + identified as dominant active species (confirmed by EPR and quenching tests). Collectively, this work establishes an effective MOF heterojunction engineering strategy for efficient antibiotic removal in saline environments, ultimately contributing to marine pollution remediation.
研究领域:
环境科学
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材料科学
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化学工程
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光催化
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海洋污染
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DOI
高影响因子
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