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One-step generation of S and N co-doped reduced graphene oxide for high-efficiency adsorption towards methylene blue.

ABSTRACT: S and N co-doped reduced graphene (S-N-rGO) nanohybrids were prepared by a one-step oil bath heating process using glutathione (GSH) as a green and mild co-reduction agent and a S and N source. It can be applied in the field of adsorption for the removal of methylene blue (MB) from aqueous solutions. The efficient adsorption rate of S-N-rGO hybrids for MB (50 mg L^-1) was observed with the best even within 2'07'' from blue solutions into colorless (the mass ratio GO : GSH = 60 : 200). Under this mass ratio, the effects of initial solution pH, temperature, initial concentration and contact time on adsorption towards MB were explored systematically. The results indicated that the adsorption capacity at 275 K could reach up to 598.8 mg g^-1, the adsorption behavior followed the pseudo-second-order kinetic model and the equilibrium adsorption data fitted the Langmuir isotherm well. Thermodynamic and kinetic analyses revealed that adsorption is an exothermic, spontaneous and physisorption process.

SUBMITTER: Li M

PROVIDER: S-EPMC9057235 | biostudies-literature | 2020 Oct

REPOSITORIES: biostudies-literature

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One-step generation of S and N co-doped reduced graphene oxide for high-efficiency adsorption towards methylene blue.

Li Meixiu M Li Yanhui Y Zhang Xiaoping X Zheng Heng H Zhang Aitang A Chen Tao T Liu Wenhao W Yu Yuanhai Y Liu Jingquan J Du Qiuju Q Wang Dechang D Xia Yanzhi Y

RSC advances 20201013 62

S and N co-doped reduced graphene (S-N-rGO) nanohybrids were prepared by a one-step oil bath heating process using glutathione (GSH) as a green and mild co-reduction agent and a S and N source. It can be applied in the field of adsorption for the removal of methylene blue (MB) from aqueous solutions. The efficient adsorption rate of S-N-rGO hybrids for MB (50 mg L<sup>-1</sup>) was observed with the best even within 2'07'' from blue solutions into colorless (the mass ratio GO : GSH = 60 : 200). ...[more]

PMID: 35515188

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Project description:The production of cobalt oxide nanoparticles and their use in the adsorption of methylene blue (MB) from solution is described in the paper. The X-ray diffraction patterns show that the synthesized cobalt oxide nanoparticles have a crystalline cubic structure. The study of the adsorption of methylene blue onto the cobalt oxide nanoparticles involved determining the contact time and initial concentration of the adsorption of MB on the adsorbent. The kinetics of adsorption were analyzed using two kinetic models (pseudo-first order and pseudo-second order), and the pseudo-second-order model was found to be the most appropriate for describing the behavior of the adsorption. This study indicates that the MLTS (monolayer with the same number of molecules per site) model is the most suitable model for describing methylene blue/cobalt oxide systems, and the parameter values help to further understand the adsorption process with the steric parameters. Indicating that methylene blue is horizontally adsorbed onto the surface of the cobalt oxide, which is bonded to two different receptor sites. Regarding the temperature effect, it was found that the adsorption capacity increased, with the experimental value ranging from 313.7 to 405.3 mg g-1, while the MLTS predicted 313.32 and 408.16 mg g-1. From the thermodynamic functions, high entropy was found around 280 mg L-1 concentration. For all concentrations and temperatures examined, the Gibbs free energy and enthalpy of adsorption were found to be negative and positive, respectively, suggesting that the system is spontaneous and endothermic. According to this study's findings, methylene blue adsorption onto cobalt oxide nanoparticles happens via the creation of a monolayer, in which the same amount of molecules are adsorbed at two distinct locations. The findings shed light on the methylene blue adsorption process onto cobalt oxide nanoparticles, which have a variety of uses, including the remediation of wastewater.

Dataset Information

One-step generation of S and N co-doped reduced graphene oxide for high-efficiency adsorption towards methylene blue.

Publications

One-step generation of S and N co-doped reduced graphene oxide for high-efficiency adsorption towards methylene blue.

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