Amino-Fe 3 O 4 -functionalized multi-layered graphene oxide as an ecofriendly and highly effective nanoscavenger of the reactive drimaren red.

Autor: Fraga TJM; Departamento de Engenharia Química, Universidade Federal de Pernambuco (UFPE), Recife, 50670-901, Brazil. tiago.fraga2012@gmail.com., da Silva LFF; Departamento de Engenharia Química, Universidade Federal de Pernambuco (UFPE), Recife, 50670-901, Brazil., de Lima Ferreira LEM; Departamento de Engenharia Química, Universidade Federal de Pernambuco (UFPE), Recife, 50670-901, Brazil.; Centro de Biociências, Universidade Federal de Pernambuco (UFPE), Recife, 50670-901, Brazil., da Silva MP; Departamento de Engenharia Química, Universidade Federal de Pernambuco (UFPE), Recife, 50670-901, Brazil., Marques Fraga DMDS; Departamento de Engenharia Química, Universidade Federal de Pernambuco (UFPE), Recife, 50670-901, Brazil., de Araújo CMB; Departamento de Engenharia Química, Universidade Federal de Pernambuco (UFPE), Recife, 50670-901, Brazil., Carvalho MN; Departamento de Engenharia Química, Universidade Federal de Pernambuco (UFPE), Recife, 50670-901, Brazil., de Lima Cavalcanti JVF; Departamento de Engenharia Química, Universidade Federal de Pernambuco (UFPE), Recife, 50670-901, Brazil., Ghislandi MG; Departamento de Engenharia Química, Universidade Federal de Pernambuco (UFPE), Recife, 50670-901, Brazil.; Campus das Engenharias-UACSA, Universidade Federal Rural de Pernambuco (UFRPE), 300 Cento e sessenta e Três Av, Cabo de Santo Agostinho, 54518-430, Brazil., da Motta Sobrinho MA; Departamento de Engenharia Química, Universidade Federal de Pernambuco (UFPE), Recife, 50670-901, Brazil.
Jazyk: angličtina
Zdroj: Environmental science and pollution research international [Environ Sci Pollut Res Int] 2020 Mar; Vol. 27 (9), pp. 9718-9732. Date of Electronic Publication: 2020 Jan 10.
DOI: 10.1007/s11356-019-07539-z
Abstrakt: Amino-functionalized multilayer graphene oxide (Am-nGO) has been synthesized and applied to remove the reactive drimaren red (DR) from aqueous solutions. Infrared spectroscopy evidenced amine and amide presence by peaks at 1579 cm -1 and a band between 3300 and 3500 cm -1 . Raman spectroscopy showed an increment in I D /I G ratio after amino-Fe 3 O 4 -functionalization of nGO from 1.05 to 1.20, referent to an increase in sp 3 domain disorder. The isoelectric point of Am-nGO was pH 8.1. From kinetic study, the equilibrium was achieved within 90 min; moreover, pseudo-n-order model satisfactorily fitted to the experimental data. Kinetic constant (k n ) was 0.71 mg 1-n  g 1-n  min -1 and modeled equilibrium sorption capacity (q e ) 219.17 mg g -1 . Equilibrium experiments showed monolayer adsorption capacity (q m ) of 219.75 mg g -1 , and BET model best fitted to the equilibrium data, indicating that the adsorption process happened with multiple layers formation. From sorption thermodynamics, the standard free energy of Gibbs and enthalpy were respectively - 31.91 kJ mol -1 (at 298 K) and 66.43 kJ mol -1 . Such data evidence the spontaneous and chemical behavior of DR adsorption as a consequence of strong electron donor-receptor interactions between the dye and the nanosorbent. By phytotoxicity assessment, Am-nGO showed inexpressive inhibitory potential to American lettuce seeds in comparison with its precursor nGO and graphite nanoplatelets.
Databáze: MEDLINE
Externí odkaz: