Chen F.,Fuzhou University |
Chen F.,Key Laboratory of Eco materials Advanced Technology |
Hong M.,Fuzhou University |
Hong M.,Key Laboratory of Eco materials Advanced Technology |
And 6 more authors.
Applied Surface Science | Year: 2015
A novel adsorbent NH2/MCM-41/NTAA, capable of simultaneous adsorption of cations and anions from aqueous solution, was prepared by immobilization of amine and nitrilotriacetic acid anhydride (NTAA) onto MCM-41. The structures and properties before and after surface modification were systematically investigated through X-ray diffraction (XRD), transmission electron microscope (TEM) and scanning electron microscope (SEM), nitrogen adsorption-desorption, and infrared spectroscopy (FTIR), thermogravimetry (TGA) and X-ray photoelectron spectroscopy (XPS). They together confirm that the amine and NTAA group were chemically bonded to the internal surface of the mesoporous. The NH2/MCM-41/NTAA were used to adsorb Pb2+ and MnO4 - in an aqueous solution in a batch system, and the maximum adsorption efficiency was found to occur at pH 5.0 and 3.0, respectively. NH2/MCM-41/NTAA exhibit preferable removal of Pb2+ through electrostatic interactions and chelation, whereas it captures MnO4 - by means of electrostatic interactions. The experimental data are fitted the Langmuir isotherm model reasonably well, with the maximum adsorption capacity of 147 mg/g for Pb2+ and of 156 mg/g for MnO4 -. The adsorption rates of both Pb2+ and MnO4 - are found to follow the pseudo-second order kinetics. Furthermore, the NH2/MCM-41/NTAA adsorbent performs good recyclability and reusability for 5 cycles use. This study indicates a potential applicability of NH2/MCM-41/NTAA as new absorbents for effective simultaneous adsorption of hazardous metal ions and anions from wastewater. © 2015 Elsevier B.V. All rights reserved.
Lin L.,Fujian Engineering College |
Yu Y.,Fuzhou University |
Yu Y.,Key Laboratory of Eco materials Advanced Technology
Jiegou Huaxue | Year: 2016
Al(OH)3 modified nickel slag adsorbent was prepared by sintering technology. The structure of the sample was characterized by BET, XRD, IR, SEM and EDAX. The sample's adsorption performance of Pb2+ and Cu2+ from aqueous solution was studied. Results indicated that the adsorbent is a loose and porous mesoporous material. Its surface had mass aluminosilicate, high-activity γ-Al2O3 and its pH ranges from 4 to 12 that all have negative charges. The BET surface of the adsorbent is 23.90 m2/g. Furthermore, its surface contains rich oxygenic functional groups, which could not only provide abundant adsorption sites for Pb2+ and Cu2+, but also improve the adsorption performance of Pb2+ and Cu2+ from waste water through the complexation of heavy metal ions. The best pH values selected in the adsorption of Pb2+ and Cu2+ are 6 and 5, respectively. With the increase of the initial concentration of simulated solution, the adsorption capacities of Pb2+ and Cu2+ gradually increased but the removal rates showed a downward trend. The competitive adsorption results of Pb2+ and Cu2+ showed that Pb2+ has better preferential adsorption than Cu2+.