Summary of doctor thesis: Research on synthesizing new composite materials system based on MOFs containing Fe and graphene oxide as photocatalysts in decomposing dyes in water environment

Study the structural, morphological and physicochemical properties of synthetic materials by modern physical and chemical methods such as XRD, FTIR, SEM, TEM, XPS, EDX, BET, TG-DTA, UV -Vis; evaluation of photochemical catalyst using visible light in the decomposition of dyes RR-195, RY-145 on synthetic materials.
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Summary of doctor thesis: Research on synthesizing new composite materials system based on MOFs containing Fe and graphene oxide as photocatalysts in decomposing dyes in water environment MINISTRY OF VIETNAM ACADEMY OF SCIENCE AND EDUCATION AND TRAINING TECHNOLOGY GRADATE UNIVERSITY OF SCIENCE AND TECHNOLOGY ------------------ VU THI HOA RESEARCH ON SYNTHESIZING NEW COMPOSITE MATERIALS SYSTEM BASED ON MOFS CONTAINING Fe AND GRAPHENE OXIDE AS PHOTOCATALYSTS IN DECOMPOSING DYES IN WATER ENVIRONMENT Major: Theoretical Chemistry and Physical Chemistry Code : 62.44.01.19 SUMMARY OF DOCTOR THESIS Ha Noi , 06- 2020 The thesis was completed at Institute of Chemistry, Vietnam Academy of Science and Technology. Supervisors: 1. Assoc. PhD. Vu Anh Tuan 2. Assoc. PhD. Vu Minh Tan Reviewer 1: Reviewer 2: Reviewer 3: The dissertation defended at Graduate University of Science and Technology, 18 Hoang Quoc Viet street, Hanoi. Time: hour, date /month/2020 The thesis could be found at: - National Library of Vietnam - Library of Graduate University of Science and Technology - Library of Institute of Chemistry INTRODUCTION * The thesis necessity Today, along with the development of science and technology, industries have been developing strongly, positively affecting the social economy. However, besides that it also has negative effects leading to environmental pollution and public health. In the sewage industry of textile, printing, paper, cosmetics ... there are many environmental pollutants such as: reactive dyes, heavy metal ions ... reactive dyes in wastewater are difficult decomposes because they are highly resistant to light, heat and other oxidizing agents. In recent years, there have been many studies and using different methods to treat textile wastewater such as mechanical, biological and chemical methods (using oxidizing agents such as H2O2, O3, H2O2/O3) applies. However, some traditional methods of treating textile dyeing wastewater, such as mechanical methods, biological methods, etc., have limitations of not thoroughly treating these pollutants. The highly effective method to treat textile dyeing is an advanced oxidation process (AOPs) using photochemical catalysts such as semiconductors such as TiO2, ZnO, CdS ... [1], photo fenton catalyst. such as Fe2O3, FeOOH, Fe@Fe2O3 ... [2]. Under the action of light (photons), electrons from the valence band jump onto the conduction band to produce electrons (e-) and holes (h+), h+ hole acts with H2O to produce free radicals •OH and e- works with O2 to create free radicals O2• -. These free radicals have a high reduction potential, capable of oxidizing organic substances, organic pigments into CO2 and H2O, so it is possible to thoroughly treat organic pigments [1-4]. To enhance the processing efficiency, the use of photocatalytic catalysts combined with strong oxidizing agents such as H2O2 and O3 have been researched and developed strongly in recent years [3]. 1 Recently, a new generation of photocatalytic catalysts is based on MOFs (Metal-organic frameworks) containing Ti, Zn, Fe, etc. nano systems such as TiO2, P25 (Degussa), ZnO, Fe2O3 ... [5-6]. The advantage of this material system is its porous structure, large surface area. The structure and properties of materials can be engineered based on the change of Ligan and various metal ions, so these MOFs have unique properties, are particularly attractive and are able to High applicability such as gas storage materials, air separation, adsorbents, catalysts, sensors, electrode materials in sensors, carriers, etc. [7-9]. In order to enhance the functionality and applicability, new composite materials based on the mechanical metal frame material are of special interest. Recently, some nano-based composites of MOFs and nano carbon such as nano MIL53/rGO, MIL88/GO, MIL101/rGO as well as MIL53, MIL88 and MIL101 contain Fe/CNT. The role of carbon nanomaterials is not only to carry and disperse MOFs, but also to play an important role in the material: the electron conductor jumps from the valence band to the conduction band, reducing the ability to re combination of e- and h+ cavities. In addition, nano carbon has the ability to absorb visible light, increasing photochemical activity. Nowadays, the trend of application of green and clean technologies is specially focused and developed. The method of synthesizing traditional MOF materials is a solvent thermal method. In this method, it is necessary to use large quantities of solvents such as DMF, an expensive and very toxic chemical. A number of recent studies on synthesizing MOFs materials without using organic solvents (using water as a substitute for published solvents [12-13]). Another new step in synthesizing MOFs is to successfully synthesize a number of nano-sized MOFs (nano MOFs) in place of traditional micrometer-sized MOFs when using techniques such as ultrasound. , microwaves ... in the synthesis of MOFs [14]. In order to integrate with the new trend of metallic mechanical frame materials, in this thesis, we focus on synthesizing 2 MOFs materials without using organic, nano-structured solvents (nano Fe-BTC/GO) and Fenton photocatalyst application for the treatment of organic pigments (reactive dyes RR-195 and RY-145) in aqueous environment. The thesis title is “Research on synthesizing new composite materials system based on MOFs containing Fe and graphene oxide as photocatalysts in decomposing dyes in water environment” * Main research contents of the thesis: - Research on synthesizing some new nano composite materials, based on nano Fe-MIL-53, Fe-MIL-88B, F ...