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      Hybrid BiOBr/UiO-66-NH 2 composite with enhanced visible-light driven photocatalytic activity toward RhB dye degradation†

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      Author(s): , , , , ,
      Publication date (Electronic, pub):
      Publication date (Electronic, collection):
      Journal: RSC Advances
      Publisher: The Royal Society of Chemistry

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          Abstract

          Metal–organic framework (MOFs) based composites have received more research interest for photocatalytic applications during recent years. In this work, a highly active, visible light photocatalyst BiOBr/UiO-66-NH 2 hybrid composite was successfully prepared by introducing various amounts of UiO-66-NH 2 with BiOBr through a co-precipitation method. The composites were applied for the photocatalytic degradation of RhB (rhodamine B) dye. The developed BiOBr/UiO-66-NH 2 composites exhibited higher photocatalytic activity than the pristine material. In RhB degradation experiments the hybrid composite with 15 wt% of UiO-66-NH 2 shows degradation efficiency conversion of 83% within two hours under visible light irradiation. The high photodegradation efficiency of BUN-15 could be ascribed to efficient interfacial charge transfer at the heterojunction and the synergistic effect between BiOBr/UiO-66-NH 2. In addition, an active species trapping experiment confirmed that photo-generated hole + and O 2 − radicals are the major species involved in RhB degradation under visible light.

          Abstract

          Metal–organic framework (MOFs) based composites have received more research interest for photocatalytic applications during recent years.

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          A new zirconium inorganic building brick forming metal organic frameworks with exceptional stability.

          Jasmina Hafizovic Cavka, Søren Jakobsen, Unni Olsbye … (2009)
          Porous crystals are strategic materials with industrial applications within petrochemistry, catalysis, gas storage, and selective separation. Their unique properties are based on the molecular-scale porous character. However, a principal limitation of zeolites and similar oxide-based materials is the relatively small size of the pores, typically in the range of medium-sized molecules, limiting their use in pharmaceutical and fine chemical applications. Metal organic frameworks (MOFs) provided a breakthrough in this respect. New MOFs appear at a high and an increasing pace, but the appearances of new, stable inorganic building bricks are rare. Here we present a new zirconium-based inorganic building brick that allows the synthesis of very high surface area MOFs with unprecedented stability. The high stability is based on the combination of strong Zr-O bonds and the ability of the inner Zr6-cluster to rearrange reversibly upon removal or addition of mu3-OH groups, without any changes in the connecting carboxylates. The weak thermal, chemical, and mechanical stability of most MOFs is probably the most important property that limits their use in large scale industrial applications. The Zr-MOFs presented in this work have the toughness needed for industrial applications; decomposition temperature above 500 degrees C and resistance to most chemicals, and they remain crystalline even after exposure to 10 tons/cm2 of external pressure.
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            Disclosing the Complex Structure of UiO-66 Metal Organic Framework: A Synergic Combination of Experiment and Theory

            Loredana Valenzano, Carlo Lamberti, Karl Petter Lillerud … (2011)
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              Photocatalytic organic pollutants degradation in metal–organic frameworks

              Xiu-Liang Lv, Yan-Qiu Zhang, Chong-Chen Wang … (2014)
              This review summarizes research advances in photocatalytic organic pollutant degradation in metal–organic frameworks. Efficient removal of organic pollutants from wastewater has become a hot research topic due to its ecological and environmental importance. Traditional water treatment methods such as adsorption, coagulation, and membrane separation suffer from high operating costs, and even generate secondary pollutants. Photocatalysis on semiconductor catalysts (TiO 2 , ZnO, Fe 2 O 3 , CdS, GaP, and ZnS) has demonstrated efficiency in degrading a wide range of organic pollutants into biodegradable or less toxic organic compounds, as well as inorganic CO 2 , H 2 O, NO 3 − , PO 4 3− , and halide ions. However, the difficult post-separation, easy agglomeration, and low solar energy conversion efficiency of these inorganic catalysts limit their large scale applications. Exploitation of new catalysts has been attracting great attention in the related research communities. In the past two decades, a class of newly-developed inorganic–organic hybrid porous materials, namely metal–organic frameworks (MOFs) has generated rapid development due to their versatile applications such as in catalysis and separation. Recent research has showed that these materials, acting as catalysts, are quite effective in the photocatalytic degradation of organic pollutants. This review highlights research progress in the application of MOFs in this area. The reported examples are collected and analyzed; and the reaction mechanism, the influence of various factors on the catalytic performance, the involved challenges, and the prospect are discussed and estimated. It is clear that MOFs have a bright future in photocatalysis for pollutant degradation.
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                Author and article information

                Journal
                Journal ID (nlm-ta): RSC Adv
                Journal ID (iso-abbrev): RSC Adv
                Journal ID (publisher-id): RA
                Journal ID (coden): RSCACL
                Title: RSC Advances
                Publisher: The Royal Society of Chemistry
                ISSN (Electronic): 2046-2069
                Publication date (Electronic, pub): 9 January 2018
                Publication date (Electronic, collection): 5 January 2018
                Publication date PMC-release: 9 January 2018
                Volume: 8
                Issue: 4
                Pages: 2048-2058
                Affiliations
                [a] School of Chemistry and Chemical Engineering, Southeast University Nanjing 211189 P. R. China jczhou@ 123456seu.edu.cn naixuli@ 123456seu.edu.cn +86 025 52090620 +86 025 52090621
                [b] Department of Chemical and Pharmaceutical Engineering, Southeast University, Chengxian College Nanjing 210088 P. R. China
                [c] Jiangsu Province Hi-Tech Key Laboratory for Biomedical Research, Southeast University Nanjing 211189 PR China
                Author information
                https://orcid.org/0000-0002-5551-782X
                Article
                Publisher ID: c7ra11500h
                DOI: 10.1039/c7ra11500h
                PMC ID: 9077208
                PubMed ID: 35542604
                SO-VID: 2f0a4bbe-0aac-4a28-a3cf-4b57cdb71a0b
                Copyright © This journal is © The Royal Society of Chemistry
                History
                Date received : 18 October 2017
                Date accepted : 6 December 2017
                Page count
                Pages: 11
                Funding
                Funded by: National Natural Science Foundation of China, doi 10.13039/501100001809;
                Award ID: 21576050
                Award ID: 51602052
                Funded by: Southeast University, doi 10.13039/501100008081;
                Award ID: Unassigned
                Funded by: Jiangsu Provincial Natural Science Foundation of China, doi 10.13039/501100004608;
                Award ID: BK20150604
                Categories
                Subject: Chemistry
                Custom metadata
                pubstatus Paginated Article

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