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题目：Fluorescence Enhancement of a Metal-Organic Framework for Ultra-Efficient Detection of Trace Benzene Vapor

作者：Wen-Bin Li, Ying Wu, Xiao-Feng Zhong, Xiong-Hai Chen, Gang Liang, Jia-Wen Ye, Zong-Wen Mo*, Xiao-Ming Chen

摘要：Indoor detection of volatile organic compounds (VOCs) concentration is necessary due to the serious toxicity hazards even at trace level. However, physisorbents usually exhibit weak interactions especially in the presence of trace concentrations of VOCs, thus exhibiting poor responsive signal. Herein, we report a new flexible metal-organic framework (MOF) that exhibits interesting pore-opening behavior after immersing in H₂O. The pore-opening phase shows significant (~116 folds) and extremely fast (< 1 minute) fluorescence enhancement after being exposed to saturated benzene vapor. The limit of detection concentration for benzene vapor can be calculated as 0.133 mg L^-1. Thus this material represents the first MOF to achieve visual detection of trace benzene vapor by the naked eyes. Theoretical calculations and single-crystal structure reveal that the special "bilateral π-π stacking" interactions between the host and guest, which facilitate electron transfer and greatly enhance the intensity of fluorescence.

期刊信息：Angew. Chem. Int. Edit. 

DOI：10.1002/anie.202303500

论文链接：

题目：Photocatalytic Valorization of Plastic Waste over Zinc Oxide Encapsulated in a Metal–Organic Framework

作者：Jibo Qin, Yibo Dou*, Jianchi Zhou, Victor M. Candelario, Henrik Rasmus Andersen, Claus Hélix-Nielsen, Wenjing Zhang*

摘要：The conversion of waste plastic into high-value-added chemicals is regarded as a promising approach for relieving global plastic pollution and contributing to the circular economy. Herein, a partial calcination strategy is developed to fabricate a zinc oxide/UiO66-NH₂ (ZnO/UiO66-NH₂) heterojunction, in which ZnO is encapsulated in porous UiO66-NH₂ for the photocatalytic valorization of plastic. This strategy preserves the framework structure of UiO66-NH₂, thus enabling the formation of ZnO with ultra-small size distributed inside the skeleton. The synergistic effect of the obtained ZnO/UiO66-NH₂ heterojunction facilitates providing an efficient channel for carrier/mass transfer and guarantees structural stability. As a result, ZnO/UiO66-NH₂ exhibits high activity for converting polylactic acid (PLA) and polyvinyl chloride (PVC) into acetic acid, coupled with H₂ production. This work provides a feasible strategy for rationally designing heterojunction photocatalysts, as well as an insight into understanding the process of photocatalytic valorization of plastic.

期刊信息:Adv. Funct. Mater.

DOI:10.1002/adfm.202214839

论文链接：

题目：Synergetic modulation of molecular oxygen activation and surface acidity/basicity on defective M/UiO-66m(M = Pt, Pd) for advanced oxidation of gaseous formaldehyde at room temperature

作者：Yifan Zhuo, Xiuling Guo, Wei Cai, Tao Shao, Dehua Xia, Chuanhao Li, Shengwei Liu*

摘要：Molecular oxygen (O₂) dominated room temperature catalytic oxidation (RTCO) technique is essential for removing indoor formaldehyde (HCHO) and guaranteeing indoor air safety. However, RTCO is challenged by low O₂ activation efficiency and uncontrollable O₂ activation pathway. In this study, defective UiO-66 (UiO-66m) with abundant coordinatively unsaturated Zr-sites (Zr-CUSs) is exploited for anchoring well-dispersed noble metals (M = Pt, Pd) and tuning surface acidity/basicity. The strong interfacial electronic metal support interactions at Zr-CUSs–M active centers trigger O₂ activation into mobile ROS (superoxide radicals (•O₂⁻), singlet oxygen (¹O₂)) at room temperature. Consequently, adsorbed HCHO can be efficiently oxidized into CO₂ with exceptional mineralization efficiency (over 90%) and considerable recyclability (6 runs, 6 h). A novel ROS-initiated ad   vanced oxidation pathway, together with the synergetic acid/base catalytic effects, is proposed based on in situ spectroscopic studies. This study will provide new insights into the O₂ activation pathway and designing advanced RTCO catalysts.

期刊信息: Appl. Catal. B: Environ.

DOI:10.1016/j.apcatb.2023.122789

论文链接：

题目：When enzyme meet MOFs: Emerging opportunities toward water treatment

作者：Junning Wang, Yanhong Zhao, Rongfu Peng, Yiming Wang, Jinhui Zhan, Xinfeng Zhu*, Haiyan Kang, Cuicui Guo, Yanli Mao*, Jeonghun Kim, Chaohai Wang*

摘要：The rapid development of the world economy and industrialization has brought about the increase of contaminants in water, which makes the removal and detection of contaminants high priority. Enzyme-based water treatment technology is an efficient and economical method, but its industrial application faces great challenges. The encounter between enzyme and metal-organic frameworks (MOFs) offers a glimmer of hope for solving the above problems, benefiting from the fascinating advantages of MOFs. This review discusses the synthesis strategies of enzyme-MOFs for water treatment and highlights the applications of enzyme-MOFs in water treatment, including removal of emerging contaminants and as an emerging sensing platform for contaminants. Furthermore, the conclusions and future perspectives are discussed and delineated. The objective of this review is to provide a new perspective on the emerging enzyme-MOFs-based platform for innovative employment in water treatment and to accelerate the development of this field for early industrial application.

期刊信息：Chem. Eng. J.

DOI：10.1016/j.cej.2023.142993

论文链接：

题目：Constructing ZIF-8-decorated montmorillonite composite with charge neutralization effect and pore structure optimization for enhanced Pb²⁺ capture from water

作者：Dongliang Yang, Yajun Li, Luojie Zhao, Feipeng Cheng, Le Chang, Dengfeng Wu*

摘要：A zeolitic imidazole framework-8/montmorillonite (ZIF-8/MMT) composite was synthesized by a simple method through in-situ growth of ZIF-8 on MMT for efficient Pb²⁺ capture from water. The adsorption process of Pb²⁺ by ZIF-8/MMT composite followed the Langmuir model and the maximum adsorption could reach up to 336.89 mg/g, which was much better than that of the monocomponent of ZIF-8 (117.78 mg/g) or MMT (85.20 mg/g). Kinetics result suggested that Pb²⁺ adsorption by ZIF-8/MMT was a pseudo-second-order dynamic process, indicating a chemisorption process dominates. Ion exchange, electrostatic attraction and hydroxyl complexation were main pathways for Pb²⁺ removal by ZIF-8/MMT composite. The enhanced performance of ZIF-8/MMT composite should be attributed to following points. Firstly, the lamellar structure of MMT was in favor of ZIF-8 nanoparticles grow and disperse uniformly on the surface, thus avoiding the aggregation. Secondly, the positive charge on ZIF-8 was neutralized by the negative charge on the surface of MMT, and thus the adsorption capacity of ZIF-8 for Pb²⁺ is effectively released. Thirdly, the combination of MMT and ZIF-8 optimized the pore structure, which was favorable for Pb²⁺ adsorption and diffusion. Therefore, the synthesized ZIF-8/MMT composites is a prospective candidate for Pb²⁺ removal from wastewater.  

期刊信息：Chem. Eng. J. 

DOI：10.1016/j.cej.2023.143014

论文链接：

题目：Plasmonic Ag nanoparticles decorated MIL-101(Fe) for enhanced photocatalytic degradation of bisphenol A with peroxymonosulfate under visible-light irradiation

作者：Yan Gong, Yu Ding, Qi Tang, Fei Lian*, Chun Bai, Ruiyi Xie, Haijiao Xie, Xu Zhao*

摘要：Photocatalytic activation of peroxymonosulfate (PMS) has garnered a lot of interest in the field of wastewater treatment. Herein, a plasmonic Ag nanoparticles decorated MIL-101(Fe) hybrid was synthesized through a photodeposition process. Upon light irradiation, the Ag/MIL-101(Fe) exhibit reinforced photocatalytic activities for elimination of bisphenol A (BPA) with PMS. The optimized 2.0% Ag/MIL-101(Fe) composite presented the highest photocatalytic activity with kinetic constant k of 0.102 min⁻¹, which was about 10-fold of the pristine MIL-101(Fe). Loading of plasmonic Ag into MIL-101(Fe) boosts photoinduced carrier separation and accelerates PMS activation to generate strong oxidative radicals. Photoelectrochemical tests and multiple spectroscopic studies confirmed the promoted charge carrier separation and transfer capability of Ag/MIL-101(Fe). Combining the results of radical trapping experiments and electron spin resonance (ESR), the formed SO₄^•−, ^•OH, ^•O₂⁻ and ¹O₂ had a significant role in the photocatalytic process. According to intermediate study, the degradation pathway was studied, and the possible mechanism was proposed.

期刊信息：Chin. Chem. Lett.

DOI:10.1016/j.cclet.2023.108475

论文链接：

题目：Introducing anthracene and amino groups into Ln-OFs for the photoreduction of Cr(VI) without additional photosensitizers or cocatalysts

作者：Wenxiao Guo,  Shufang Wang, Hongguo Hao, *  Xiangjin Kong,  Hui Yan,   Hongjie Zhu,  Yunwu Li,  Huawei Zhou,  Dichang Zhong* and  Fangna Dai

摘要：The utilization of catalysts with high stability and activity for the photoreduction of Cr(VI) is desirable but has many challenges. Since metal–organic frameworks (MOFs) have unique versatilities and facile structural modulations, we fabricated a stable MOF as a highly efficient photocatalyst by incorporating chromophores into lanthanide MOFs for efficient Cr(VI) reduction. Subsequently, a novel two-dimensional (2D) layered structural Sm(III) MOF (namely LCUH-100, [Sm₄(AAPA)₆(DMA)₂(H₂O)₄][DMA]₃[H₂O]₈, AAPA²⁻ = 5-[(anthracen-9-yl-methyl)-amino]-1,3-isophthalate, DMA = N,N′-dimethylacetamide) with sql topology symbol was constructed by incorporating dinuclear clusters, {Sm₂(COO)₆} and AAPA²⁻, which demonstrated excellent chemical and thermal stability, especially retaining its complete framework in aqueous solutions at a pH range of 2–12 for 24 h. Interestingly, LCUH-100 could efficiently and rapidly photocatalyze the reduction of Cr(VI) to Cr(III) without additional photosensitizers or cocatalysts. In the photoreduction of Cr(VI), LCUH-100 showed a high rate constant (k) of 0.186 min⁻¹ and a high Cr(VI) reduction rate of 1.67 mg_Cr(VI) g⁻¹_cata min⁻¹ at pH 2. Furthermore, the photocatalyst LCUH-100 could be reused for 5 cycles without any significant loss of catalytic activity. This work provides a new strategy for the exploitation of stable and efficient catalysts for the photocatalytic reduction of Cr(VI).

期刊信息:Inorg. Chem. Front.

DOI:10.1039/D3QI00102D

论文链接：

本期编辑

刘梦源，女，北京建筑大学环境工程专业2022级硕士研究生。主要研究方向为金属-有机骨架材料的设计与制备及其在水环境修复方面的研究。