(Luận Văn) The Design And Synthesis Of Graphene Oxide At Iron Oxide (Gofexoy) For Catalytic Application.pdf

THAI NGUYEN UNIVERSITY UNIVERSITY OF AGRICULTURE AND FORESTRY XAYALACK LASY THE DESIGN AND SYNTHESIS OF GRAPHENE OXIDE AT IRON OXIDE (GO@FEXOY) FOR CATALYTIC APPLICATION BACHELOR THESIS Study Mode: Full-time Lu an Major: Environmental science and management va n Faculty: International Training and Developing center ac th Batch: 43 Advance Education Program si nl w d oa an lu nf va oi lm ul Thai Nguyen, October 2015 at nh z z DOCUMENTATION PAGE WITH ABSTRACT Thai Nguyen University of Agriculture and Forestry Degree Program Bachelor of Environment science and Management Student name Xayalack Lasy Student ID DTN1153110275 Thesis title The design and synthesis of graphene oxide at iron oxide (GO@FexOy) for catalytic application Assoc Prof DR Tran Van Dien Supervisors Assoc Prof Yu-Fen Huang PhD Student He Yue PhD Student Celeste an Lu Abstract: The thesis describes the oxidation of methylene blue, a basic dye of thiazine series using a Fenton reaction at normal laboratory temperature and at atmospheric pressure and the advantages in use of magnetic nanoparticles (MNPs), graphene oxide @iron oxide nanoparticles(GO@FexOy) in the reaction Oxidation by Fenton reactions is proven and economically feasible process for destruction of a variety of hazardous pollutants in wastewater MNPs were synthesis via a thermal decomposition method and (GO@FexOy) via electrooxidation procedure The synthesis of MNPs and (GO@FexOy) was characterized by several techniques, Ultraviolet–visible spectroscopy (UV-Vis), and Transmission Electron Microscopy (TEM) The concentrations of dye degradation were determined ectrophotometrically using Plate Readers at 665 nm, the absorption maximum of the dye Keywords: Fenton reaction, nanocomposite, magnetic nanocomposites, Graphene oxide @ iron oxide nanoparticles, absorption, methylene blue, H2O2 n va ac th si w September 30, 2015 nl d oa Date of submission: Supervisor’s signature 40 pages Number of pages: an lu oi lm ul nf va at nh z z ACKNOWLEDGEMENT First of all, we know that knowledge is just only can be proved by our works, and internship is one of the best opportunity for student whose can their first project before they find their jobs to enroll in the future Besides that, we are not only improving ourselves by knowledge in company environment, institute or laboratory but also making more friends whose are having many experiences in environment, and it will help us in the near future From my perspective, this internship is absolutely needed, helpful and important Because of that, and be assigned by the International Training Center and also the allowed of Department of Biomedical Engineering and Environmental Science (National Tsing Hua University, Taiwan) To well done this thesis, I want to express profound gratitude to Advanced Education Program, the school administrators, the staffs in Department of Biomedical Engineering and Environmental Science, the staffs of YF laboratory, and particularly my supervisor, Associate Prof DR Tran Van Dien and Associate Professor Huang Yu Fen whose is always support me every single time I got troubles I would like to send both of supervisor a warmly thanks for the supporting me, and for their sacrifice for education, as same as environmental issues in Taiwan and Vietnam as all countries in the world Lu Finally, I would like to say that I have tried my best to finish this thesis in the an va best way, I guess However, to be honest, I partly believe that my thesis still have n some problems because of the limitation of knowledge and reality experiences, th ac especially in our environmental circumstances these days It is totally happy if I can si get feedbacks and comments from you, my teachers, Professor, and Supervisor, to d oa Sincerely, nl w finish my thesis in a fantastic way, to get the best results an lu Thai Nguyen, October, 2015 ul nf va Student oi lm Xayalack Lasy at nh z z STATEMENT BY THE AUTHOR I hereby declare that this submission is my own work from doing my experimental research and to the best of my knowledge, it contains no material previously published, nor material which to a substantial extent has been accepted for the award of any other degree or diploma at any educational institution, except where due acknowledgement is made in the thesis an Lu n va ac th si nl w d oa an lu oi lm ul nf va at nh z z (Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application (Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application TABLE OF CONTENTS CHAPTER I INTRODUCTION 1.1 Rationale 1.2 Objectives CHAPTER II LITERATURE REVIEW 2.1 Nanotechnologies and Nanomaterial 2.1.1 Nanotechnologies 2.1.2 Nanomaterial 2.1.3 Methods synthesis of nanomaterial 2.1.4 Overview of research and application of nanomaterial and nanocomposite 2.1.5 Magnetic NPs and application of magnetic NPs in wastewater treatment 11 2.2 Fenton reaction in the degradation of methylene blue 13 2.3 The use of magnetic nanocomposites in catalytic degradation of methylene blue 14 2.4 The equipment used to determine the properties of gold nanoparticles and methylene blue degradation 15 2.4.1 Ultraviolet–visible spectroscopy (UV-Vis) 15 2.4.2 Transmission Electron Microscopy (TEM) 15 CHAPTER III METHODOLOGY 18 Lu 3.1 Preparation of magnetic nanoparticles and Graphene oxide@iron oxide 18 an 3.1.1 Method synthesis Fe3O4 NPs 18 va 3.1.2 Method synthesis FeOx, GO@FexOy andGO-Au,FeOx 19 n ac th 3.2 Fenton reaction and the use of Magnetic NPs and Graphene oxide@ si iron oxide NPs in in Fenton reaction for catalytic degradation of dye 21 w 3.2.1 Chemicals and equipment 21 nl 3.2.2 Method preparation stock solution: 22 oa d 3.2.3 Procedure 25 lu an CHAPTER IV RESULTS AND DISCUSSIONS 26 nf va 4.1 Characterizations 26 oi lm ul 4.1.1 Magnetic nanoparticles 26 at nh z z (Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application (Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application 4.2 Magnetic NPs and Graphene@iron oxide NPs apply in Fenton reaction degradation of methylene blue 27 4.2.1 Standard Fenton-like reaction for degradation of methylene blue 27 4.2.2 Application of magnetic nanoparticles,graphene oxide @iron-oxide on degradation of MB 31 4.2.3 The use of MNC, GO-FeOx in degradation of dye 34 CHAPTER V CONCLUSIONS AND RECOMMENDATION 36 5.1 Conclusions 36 5.2 Recommendation 36 REFERENCE 37 an Lu n va ac th si nl w d oa an lu oi lm ul nf va at nh z z (Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application (Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application LIST OF FIGURES Figure 1.1 Diagram of principle synthesis of nanomaterial Figure 1.2 Ultraviolet–visible spectroscopy (UV-Vis) 15 Figure 1.3 Schematic diagram of a TEM Generally, TEM is divided into two main parts: illumination and imaging 17 Figure 1.4 Setup for synthesis MNC 18 Figure 1.5 Setup usingsonicators method 19 Figure 1.6 Setup for extract Fe3O4 NPs by centrifuging 19 Figure 1.7 Scheme for synthesis iron oxide, Graphen at iron oxide and Graphen at gold,iron oxide nanoparticles 20 Figure 1.8 Using plastic tubes to containing the solutions of MB degradation on the magnetic stirrer 25 Figure 1.9 TEM images of Fe3O4 NPs in different scale bar: (a) 50 nm; (b) 100 nm 26 Figure 2.0 dynamic light-scattering (DLS) 27 Figure 2.1 UV–Vis spectra of 3.13×10-5 M methylene blue solution at (control) with absorption maximum at 665 nm 27 an Lu Figure 2.2 Temporal UV–Vis spectra absorption showing va changes the concentration of methyleneblue during Fenton reaction: a) n at 0min; b) at 60min 28 th ac Figure 2.3 Degradation of methylene blue by Fe (II) (pH 2-3) 28 si Figure 2.4 Effect of [Fe2+] on degradation of MB at 60 minutes 29 nl w Figure 2.5 Effect of [H2O2] on degradation of MB at 30 minutes 30 oa Figure 2.6 Effect of pH on degradation of MB 30 d an lu Figure 2.7 Degradation of methylene blue by Fe (II); Fe (II) + Fe (III) and Fe nf va (III) at pH 2-3 31 lm ul Figure 2.8 the degradation of MB by GO-FeOx 3h 32 Figure 2.9 the degradation of MB by GO-Au,FeOx 5V 32 oi at nh z z (Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application Therefore, this experimental research could compare that Figure 2.8 and Figure 2.9 are clearly different level of the degradation with comparing by control time and percent in degradation that GO-FeOx is the best in degradation of MB, which presented in a picture below 4.2.2.3 Detection Concentration ofGO-FeOx and GO-Au,FeOx Based on the detection concentration of GO-FeOx and GO-Au,FeOx, the researcher need to prepare a sample solution that made the control by using Fe3+ which different Concentration (mM) of each sample from sample to sample Then last sample adding sample7 (GO-FeOx3h) and sample ( GO-Au,FeOx 5V) with doing detection by adding all sample into plate reader and using UV- visible Lu absorption spectra (Computer program) for detection automatically obtained data, by an looking in the table below n va 1.720199943 1.417500019 1.235700011 0.995700002 0.614400029 0.298900008 ac si nl w d oa an 0.676299989 nf va GO-Au,FeOx 5V 0.48089999 lu Sample Fe3+2 Fe3+1.6 Fe3+1.2 Fe3+0.8 Fe3+0.4 Fe3+0.2 GO-FeOx3h Abs (a u.) th Sample Sample Sample Sample Sample Sample Sample Concentration (mM) oi lm ul Table 1.8 detection concentration of GO-FeOx 3h and GO-Au,FeOx 5V at nh 33 z z (Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application (Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application Then calculating by take the abs of GO-FeOx 3h and abs of GO-Au,FeOx 5V minus 0.282 and divide by 0.7404 is will be equals the Concentration of GO-FeOx 3h and GO-Au,FeOx Conc of GO-FeOx: 0.27 mM Conc of GO-Au, FeOx: 0.53 mM 3.5 2mM 2.5 1.6mM 1.2mM 1.5 0.8mM 0.4mM 0.5 0.2mM 0 15 20 y = 0.7404x + 0.282 R² = 0.9697 Series1 Linear (Series1) 0.5 an Lu 1.8 1.6 1.4 1.2 0.8 0.6 0.4 0.2 10 1.5 2.5 va n Figure 3.0 detection of Concentration of GO-FeOx 3h and GO-Au,FeOx 5V ac th si 4.2.3 The use of MNC, GO-FeOx in degradation of dye Based on the conditions from the Fe (II); Fe (II) + Fe (III) and Fe (III) as above, nl w MNC and GO@FeOxwas further investigated for MB degradation afterwards The d oa conversion efficiency was conducted, with the Iron (II), Iron (III), Iron (II) + Iron (III), of H2O2 were kept at xx M an lu MNC, GO@FeOxbefore annealing andGO@FexOy after annealing The concentrations va ul nf Figure 3.1 shows UV-vis absorption spectra of GO and GO-FeOx, respectively oi lm The optical absorption spectrum of the GO suspension shows an absorption peak at at nh 34 z z (Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application (Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application 230 nm and a shoulder at 290 nm, corresponding to П–П* transitions for aromatic C=C and n–П* transitions for C=O bonds After the electro-deposition of FeOx on GO, the main absorption peak was broadened These changes can be assigned to the formation of a composite between the FeOx and the graphene sheets during the electro-deposition reaction Besides, the optical absorbance of GO–FeOx in the visible and NIR regions was significantly enhanced relative to pristine GO, likely owing to the partial reduction of GO during the formation of FeOx on GO sheets 0.5 0.4 0.3 0409 3h 1000rcf sub 0.1x 0.2 GO-FeOx sub 0.1x 0.1 0 200 400 600 800 1000 Figure 3.1UV-vis absorption spectra of GO and GO-FeOx Overall the degradation of Methalene Blue by GO-FeOx is not only one time degradation but it’s could be degraded several times of waste water or degraded of Methalene Blue So, based on the research experiment that GO-FeOx could reduce waste water an Lu possibility which mentioned in the figure 3.2 as well as it’s also process furthermore that it can recycle for the degradation of Methalene Blue again n va 12000 th ac 10000 0409 3h 1000rcf sub 0.1x GO-FeOx si 8000 6000 nl w rGO-FeOx d oa 4000 2000 500 1000 1500 2000 2500 ul nf va an lu oi lm Figure 3.2recycle the degradation of GO-FeOx on MB at nh 35 z z (Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application (Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application CHAPTER V CONCLUSIONS AND RECOMMENDATION 5.1 Conclusions The whole purpose of this experiment researching is comparing between Fe2+, Fe3+ whether which one will be the best on degradation of Methylene blue and powerful in reducing waste water, however Fe2+ and Fe3+ is not good enough to degraded MB, because both of this materials (Fe2+ and Fe3+) cannot be the best to a recycling degradation in several time Therefore replacing GO-FeOx 3h was necessary and important to progressing in this experiment that successfully degradation MB as specially this material (GO-FeOx) available to recycling degradation MB by several times So Graphene oxide @Iron oxide nanoparticles and magnectic nanoparticles were successfully synthesized by a simple and inexpensive synthetic procedure with controlled size and shell thickness The magnetic nanocomposites showed good catalytic performance for MB organic dye oxidation by H2O2after 1hours of reaction The reaction was able to proceed at pH neutral in room temperature 5.2 Recommendation Lu We continue survey the synthesis of magnetic nanoparticles with different an conditions to uniform the size of nanoparticles and optimum the synthetic procedure va and continue lerning how to catalytic application of all nonmaterial for powerful and n ac th useful processing in recycle degradation of MB or waste water as well The research experimental is very important to explore new scientific ideas for si w improve and develop the previous ideas as very necessary as possible to optimize the nl concentration of H2O2, Fe (II), Fe (III) and magnetic nanocomposites using on d oa degradation of MB an lu oi lm ul nf va at nh 36 z z (Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application(Luận.văn).the.design.and.synthesis.of.graphene.oxide.at.iron.oxide.(gofexoy).for.catalytic.application 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