Summary of Environmental engineering doctoral thesis: Study on synthesis of manganese oxide, iron oxide on reduced graphene oxide nanoparticles to treatment of pigments and pesticides in the aqueous environment

Successfully synthesized nano – mixed oxide by different gelling agents; compared, selected the appropriate gelling agent; researched to evaluate the catalytic activity of mixed oxide nanoparticles formed with pollutants methyl orange (MO), methylene blue (MB). Successful dispersed mixed oxide nanoparticles on rGO; investigated catalytic activity of material systems on parathion, fenitrothion.
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Summary of Environmental engineering doctoral thesis: Study on synthesis of manganese oxide, iron oxide on reduced graphene oxide nanoparticles to treatment of pigments and pesticides in the aqueous environment MINISTRY OF EDUCATION AND VIETNAM ACADEMYOF TRAINING SCIENCE AND TECHNOLOGY GRADUATE UNIVERSITY SCIENCE AND TECHNOLOGY ……..….***………… Nguyen Vu Ngoc Mai STUDY ON SYNTHESIS OF MANGANESE OXIDE, IRON OXIDE ON REDUCED GRAPHENE OXIDE NANOPARTICLES TO TREATMENT OF PIGMENTS AND PESTICIDES IN THE AQUEOUS ENVIRONMENT Major: Environmental Engineering Code: 9 52 03 20 SUMMARY OF ENVIRONMENTAL ENGINEERING DOCTORAL THESIS Hanoi – 2020 The thesis was performed at Graduate University of Science and Technology, Vietnam Academy Science and Technology Supervisor 1: Assoc. Prof. Dr.Nguyen Quang Trung Supervisor 2: Assoc. Prof. Dr. Dao Ngoc Nhiem Reviewer 1: … Reviewer 2: … Reviewer 3: …. The thesis will be defended at the doctoral thesis committee at the Academy level, meeting at the Graduate University of Science and Technology - Vietnam Academy of Science and Technology at ………… on………, 20……. The thesis can be found in: - The library of Graduate University of Science and Technology - National Library of Vietnam NEW FINDINGS OF THE THESIS 1. Successfully synthesized mixed oxide Fe2O3 – Mn2O3 nanoparticles using tartaric acid (AT), tartaric acid combined with polyvinyl alcohol (PVA) as gel – forming agents. Nanostructured Fe2O3-Mn2O3 mixed-oxides prepared by the combustion method that used a mixture of tartaric acid and PVA (pH 4, the molar ratio of Fe/Mn = 1/1, the molar ratio of AT/PVA = 1/1, the molar ratio of (Fe/Mn)/(AT /PVA) = 1/3, the gel-forming temperature of 80 oC and the calcination temperature at 450 oC during 2h) had uniform size and specific surface area of their (63.97 m2/g) was larger than using only tartaric acid as gel – forming agents (46.25 m2/g). 2. Studied the photocatalytic ability of Fe2O3 –Mn2O3 and Fe2O3 –Mn2O3/rGO materials to decompose some pollutants such as methyl orange , methylene blue, parathion, fenitrothion. For the first time, mixed oxide Fe2O3 – Mn2O3/rGO nanoparticles were studied to decompose parathion and fenitrothion. The results showed that parathion was decomposed efficiency (after 90 minutes reaction time, pH 7.5, the concentration after adsorption equilibrium is 1.5 ppm, the catalyst content of 0.05 g/L, the decomposition efficiency of parathion is 77.32%). The decomposition efficiency fenitrothion (after 90 minutes reaction time, pH 7.0, concentration after adsorption equilibrium 1.4 ppm, catalyst content of 0.05 g/L) is 88.61%. Through modern analytical methods such as High- performance liquid chromatography and Gas chromatography- mass spectrometry, some intermediates formed during the decomposition of methyl orange, methylene blue, parathion, fenitrothion are proposed. LIST OF WORKS HAS BEEN PUBLISHED 1. Nguyen Vu Ngoc Mai, Dao Ngoc Nhiem, Pham Ngoc Chuc, Nguyen Quang Trung, Cao Van Hoàng, Synthesis of Fe2O3- Mn2O3 nanostructured by tartaric acidand preliminary study on methylene orange degradations, Vietnam Journal of Chemistry (2017), 55 (3e12). 2. Nguyen Vu Ngoc Mai, Nguyen Thi Ha Chi, Nguyen Quang Bac, Doan Trung Dung, Pham Ngoc Chuc, Duong Thi Lim, Nguyen Quang Trung, Dao Ngoc Nhiem, Synsthesis of nano – mixed oxides Fe2O3 - Mn2O3 and their applications to photocatalytic degradation of Parathion from water, Proceedings The 3rd International Workshop on Corrosion and Protection of Materials (2018), Hanoi, Vietnam. 3. Nguyen Vu Ngoc Mai, Duong Thi Lim, Nguyen Quang Bac, Nguyen Thi Ha Chi, Doan Trung Dung, Ngo Nghia Pham, Dao Ngoc Nhiem, Fe2O3/Mn2O3 nanoparticles: Preparations and applications in the photocatalytic degradation of phenol and parathion in water, Journal of the Chinese chemical society (2019), DOI : 10.1002/jccs.201900033 4. Nguyen Vu Ngoc Mai, Doan Trung Dung, Duong Thi Lim, Dao Ngoc Nhiem, Study on synthesis of Mn3O4 nanoparticles and their photocatalytic ability, Vietnam Analytical Sciences Society (2019), 1, 24. 5. Nguyen Vu Ngoc Mai, Nguyen Thi Ha Chi, Duong Thi Lim, Nguyen Quang Trung, Dao Ngoc Nhiem, Study on photodegradation of methyl orange, dimethoate and parathion from aqueous solution by nano iron – manganese oxide particles, Vietnam Journal of Chemistry (2019), 57(4e1,2) 330-334. 6. Nguyen Vu Ngoc Mai, Doan Trung Dung, Nguyen Quang Bac, Duong Thi Lim, Nguyen Quang Trung, Dao Ngoc Nhiem, Synthesis of nano-mixed oxides Fe2O3-Mn2O3 and their applications in phenol treatment, Vietnam Journal of Chemistry (2019), 57(4e1,2) 330-334. 1 INTRODUCTION The urgency of the thesis Currently, environmental pollution is a great challenge to the globe including Vietnam. Industrialization and modernization of the economy are raised many persistent pollutants such as pigments, phenol, antibiotics, …becoming more and more. Viet Nam is a long-standing agricultural country. To meet the food needs of the increasing number of people, the cultivated area is increasingly shrinking, measures such as agricultural intensification, seed improvement, the use of crop pesticides are implemented to increase productivity. Organophosphorus with the advantage of a wide range of prevention and rapid elimination of pests and diseases are now widely applied. However, the widespread use of organophosphorus during cultivation has left this chemical residue in the environment very large, especially in the aqueous environment. Thus, not only in industrial wastewater but also in agricultural wastewater, durable and persistent organic substances should be treated. Currently, many studies focus on completely mineralizing these persistent pollutants into non- ...