title: Removal of para-nitrochlorobenzene from aqueous solution on surfactant-modified nanoscale zero-valent iron/graphene nanocomposites.
abstract: This study demonstrated a remarkably simple and efficient method for the synthesis of nanoscale zero-valent iron (NZVI)/graphene (GN) nanocomposites. In order to prevent the agglomeration and restack of nanocomposites, chemical functionalization of nanocomposites with cetyltrimethylammonium bromide was proposed. The adsorption performance of surfactant-modified NZVI/GN nanocomposites was evaluated for the removal of para-nitrochlorobenzene (p-NCB) from aqueous solutions. The characteristics of nanocomposites were characterized by X-ray diffraction, BET surface area, Fourier transform infrared spectrum, thermogravimetric analysis and scanning electron microscopy. The effect factors including initial solution pH, contact time, reaction temperature, dosage, initial concentration of humic acid (HA) on the adsorption property of p-NCB onto surfactant-modified nanocomposites were investigated. The adsorption kinetics fitted well with pseudo-second-order model. The adsorption capacity of p-NCB on surfactant-modified nanocomposites inferred from the Langmuir model was 105.15 mg/g at 293 K. The thermodynamic parameters indicated that the adsorption of p-NCB onto surfactant-modified nanocomposites was an exothermic and spontaneous process. HA had a strong suppression effect on p-NCB uptake in the adsorption experiment.
authors.affiliation: a College of Environment and Energy , South China University of Technology , Guangzhou 510006 , People's Republic of China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Wu
authors.forename: Hanjin
authors.initials: H
authors.lastname: Luo
authors.forename: Hou
authors.initials: H
authors.lastname: Wang
mesh_terms: D000327:Adsorption; D000077286:Cetrimonium; D002593:Cetrimonium Compounds / Q000737:chemistry*; D052918:Environmental Restoration and Remediation; D006108:Graphite / Q000737:chemistry*; D006812:Humic Substances; D007501:Iron / Q000737:chemistry*; D053761:Nanocomposites / Q000737:chemistry*; D009578:Nitrobenzenes / Q000737:chemistry*; D012996:Solutions; D013501:Surface-Active Agents / Q000737:chemistry; D014865:Waste Disposal, Fluid / Q000379:methods; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D002593:Cetrimonium Compounds; D006812:Humic Substances; D009578:Nitrobenzenes; D012996:Solutions; D013501:Surface-Active Agents; D014874:Water Pollutants, Chemical; D006108:Graphite; C010407:4-chloronitrobenzene; D007501:Iron; D000077286:Cetrimonium
keywords: adsorption; cetyltrimethylammonium bromide; graphene; nanoscale zero-valent iron; para-nitrochlorobenzene