title: Investigation of Mesoporous Graphitic Carbon Nitride as the Adsorbent to Remove Ni (II) Ions.
abstract: The mesoporous graphitic carbon nitride (mpg-C3N4/r, r was defined as the initial silica/dicyandiamide mass ratio) was successfully synthesized by heating the mixture of silica and dicyandiamide in a nitrogen atmosphere. The morphology and structure of mpg-C3N4/r were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Brunauer-Emmett-Teller surface area measurement (BET), X-ray powder diffraction (XRD), and Fourier Transform Infrared spectroscopy (FT-IR). The adsorption performances of Ni (II) ions by mpg-C3N4/r were investigated. With increasing of r value, the BET specific surface area of the synthesized mpg-C3N4/r increased; the highest specific surface area of mpg-C3N4/1.5 increased up to 169.3 m2/g. This work shows that mpg-C3N4/1.5 is a promising, high-efficiency adsorbent that can be used to purify the water of a low Ni (II) ions concentration. The maximum adsorption capacity of Ni(II) ions by mpg-C3N4/1.5 was 15.26 mg/g. The adsorption properties of Ni (II) ions by mpg-C3N4/r complied well with pseudo-second-order kinetics and Langmuir isotherm model.
authors.affiliation: Faculty of Chemical, Environmental and Biological Science and Technology, Dalian University of Technology, Dalian, 116024 China.
authors.forename: Gang
authors.initials: G
authors.lastname: Xin
authors.forename: Yuanjiao
authors.initials: Y
authors.lastname: Xia
authors.forename: Yuhua
authors.initials: Y
authors.lastname: Lv
authors.forename: Luman
authors.initials: L
authors.lastname: Liu
authors.forename: Bei
authors.initials: B
authors.lastname: Yu
mesh_terms: D000327:Adsorption; D007700:Kinetics; D009532:Nickel / Q000737:chemistry*; D009570:Nitriles / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods
chemical_list: D009570:Nitriles; D014874:Water Pollutants, Chemical; C011206:cyanogen; D009532:Nickel