title: In-situ deposition of silver-iron oxide nanoparticles on the surface of fly ash for water purification.
abstract: In this study, a fly ash based composite, Ag-iron oxide/fly ash, was synthesized via a facile one-pot hydrothermal process using fly ash, ferrous chloride, and silver nitrate as precursors. Field emission scanning electron microscopy (FE-SEM), EDX, transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infra-red spectroscopy (FTIR), Photoluminescence (PL) and Brunauer-Emmett-Teller (BET) surface area measurement confirmed the formation of composite particle. FA provided a suitable surface for the in-situ deposition of Fe3O4 and Ag NPs during hydrothermal treatment. As a result, the particle size of Fe3O4 and Ag NPs was sufficiently decreased, and the surface area of the NPs as well as, a whole matrix was increased. The antimicrobial activity of the composite was accessed by Escherichia coli inhibition assay. Lead(II) ion adsorption efficiency of the composite was analyzed from a series of batch adsorption experiments (the effects of concentration, contact time, pH and adsorbent dose on the adsorption of Pb(II) ion from aqueous solution). Results indicated that as-synthesized composite has high antibacterial capacity, and the metal ions uptake efficiency compared to fly ash particle. Furthermore, incorporation Fe3O4 NPs onto the fly ash make it easily separable from a reaction system using an external magnet. The composite synthesis protocol is a simple method that utilizes a readily available industrial byproduct to produce a unique composite for environmental remediation.
authors.affiliation: Department of Bionanosystem Engineering, Graduate School, Chonbuk National University, Jeonju 561-756, Republic of Korea; Department of Chemistry, Tri-Chandra Multiple Campus, Tribhuvan University, Kathmandu, Nepal.
authors.forename: Mahesh Kumar
authors.initials: MK
authors.lastname: Joshi
authors.affiliation: Department of Bionanosystem Engineering, Graduate School, Chonbuk National University, Jeonju 561-756, Republic of Korea; Department of Engineering Science and Humanities, Institute of Engineering, Pulchowk Campus, Tribhuvan University, Kathmandu, Nepal.
authors.forename: Hem Raj
authors.initials: HR
authors.lastname: Pant
authors.affiliation: Department of Bionanosystem Engineering, Graduate School, Chonbuk National University, Jeonju 561-756, Republic of Korea.
authors.forename: Nina
authors.initials: N
authors.lastname: Liao
authors.affiliation: Department of Bionanosystem Engineering, Graduate School, Chonbuk National University, Jeonju 561-756, Republic of Korea.
authors.forename: Jun Hee
authors.initials: JH
authors.lastname: Kim
authors.affiliation: Department of Bionanosystem Engineering, Graduate School, Chonbuk National University, Jeonju 561-756, Republic of Korea. Electronic address: khanjoo@jbnu.ac.kr.
authors.forename: Han Joo
authors.initials: HJ
authors.lastname: Kim
authors.affiliation: Department of Bionanosystem Engineering, Graduate School, Chonbuk National University, Jeonju 561-756, Republic of Korea. Electronic address: biochan@jbnu.ac.kr.
authors.forename: Chan Hee
authors.initials: CH
authors.lastname: Park
authors.affiliation: Department of Bionanosystem Engineering, Graduate School, Chonbuk National University, Jeonju 561-756, Republic of Korea; Division of Mechanical Design Engineering, School of Engineering, Chonbuk National University, Jeonju 561-756, Republic of Korea; Eco-friendly Machine Parts Design Research Center, Chonbuk National University, Jeonju 561-756, Republic of Korea. Electronic address: chskim@jbnu.ac.kr.
authors.forename: Cheol Sang
authors.initials: CS
authors.lastname: Kim
mesh_terms: D000327:Adsorption; D000890:Anti-Infective Agents / Q000737:chemistry* / Q000494:pharmacology; D060729:Coal Ash / Q000737:chemistry* / Q000494:pharmacology; D004396:Coloring Agents; D004926:Escherichia coli / Q000187:drug effects / Q000254:growth & development; D005290:Ferric Compounds / Q000737:chemistry* / Q000494:pharmacology; D007854:Lead / Q000302:isolation & purification*; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D053758:Nanoparticles / Q000737:chemistry / Q000648:ultrastructure; D012834:Silver / Q000737:chemistry* / Q000494:pharmacology; D012835:Silver Nitrate / Q000737:chemistry; D014871:Water Microbiology; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*; D014961:X-Ray Diffraction
chemical_list: D000890:Anti-Infective Agents; D060729:Coal Ash; D004396:Coloring Agents; D005290:Ferric Compounds; D014874:Water Pollutants, Chemical; C000499:ferric oxide; D007854:Lead; D012834:Silver; D012835:Silver Nitrate
keywords: Antibacterial activity; Composite particle; Fly ash; Lead(II) ions