Surface area for the absorption process can be increased. Composite was synthesized using solvothermal method, in which mixed-metal oxide nanoparticles were directly formed in-situ from precursor salts onto GNPs surface. Synthesized material was analyzed using XRD, SEM and EDX methods to determine its properties. Heavy metal absorption capacity was also studied and showed good results. | Vietnam Journal of Science and Technology 56 (1A) (2018) 204-211 STUDY ON SYNTHESIS OF MnFe2O4/GNPs COMPOSITE AND APPLICATION ON HEAVY METAL REMOVAL Nguyen Duy Anh Department of Inorganic Chemistry, Institute of Chemistry and Materials, 17 Hoang Sam, Cau Giay, Ha Noi, Viet Nam Email: Received: 15 August 2017; Accepted for publication: 21 February 2018 ABSTRACT Nowadays, composite materials between mixed-metal oxides and graphene are widely studied due to their multiple applications on different fields. MnFe2O4 is a magnetic material which has the ability to absorb toxic heavy metal in water. Graphene nanoplatelets (GNPs) with about 10 layers, is one of type of graphene. GNPs was used as matrix for the fine distribution of metal oxide nanoparticles. Surface area for the absorption process can be increased. Composite was synthesized using solvothermal method, in which mixed-metal oxide nanoparticles were directly formed in-situ from precursor salts onto GNPs surface. Synthesized material was analyzed using XRD, SEM and EDX methods to determine its properties. Heavy metal absorption capacity was also studied and showed good results. Keywords: environmental treatment, MnFe2O4, GNPs, composite, solvothermal, heavy metal absorption. 1. INTRODUCTION In Vietnam, the rapidly growing industrialization and the fast growing factories lead to water being contaminated toxic heavy metals. The exposure to these heavy metals is considered a major health risk due to their toxicity and carcinogenicity. Among them, lead is a common environmental pollutant. Lead exposure can occur from various routes like air, soil, commerical products and especially from water. Causes of lead contamination often linked to industrial use of lead, include factories and facilities that produce lead-acid batteries, lead wire and pipe, metal recycling and foundries. Lead builds up in the body can damage brain and kidneys; in severe cases anemia, coma and death may occur. In .
