Facile synthesis of layer-by-layer decorated graphene oxide based magnetic nanocomposites for β-agonists/dyes adsorption removal and bacterial inactivation in wastewater

• Published in: Journal of alloys and compounds 2021-07, Vol.870, p.159414, Article 159414
• Main Authors: Jiang, Xu, Pan, Wenyue, Xiong, Zhili, Zhang, Yixuan, Zhao, Longshan
• Format: Article
• Language: English
• Subjects: Adsorption; Adsorptivity; Antibacterial; Chitosan; Deactivation; Dopamine; Dyes; E coli; Electron micrographs; Fourier transforms; Graphene; Iron oxides; Isotherms; Magnetic measurement; Magnetic nanoparticles; Methylene blue; Microorganisms; Nanocomposites; Nanomaterials; Nanoparticles; Photoelectrons; Pollutants; Silicon dioxide; Wastewater remediation; Wastewater treatment; X ray photoelectron spectroscopy; β-agonists and dyes removal
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2021.159414

•Thiol modified chitosan magnetic graphene oxide nanocomposite was synthesized.•Simultaneous bacteria inactivation and pollutants removal was investigated.•Nanocomposite had excellent disinfection ability toward E. coli and S. aureus bacteria.•The antibacterial mechanism and adsorption mechanism was investigated. Fe3O4@SiO2/GO/CS/MPTS as versatile biosorbents for β-agonists/dyes removal and microbial inactivation. [Display omitted] The escaped β-agonists and dyes during conventional wastewater treatment processes pose a non-negligible threat to humans and environment. In this study, a novel method based on the thiol modified chitosan magnetic graphene oxide nanocomposite (Fe3O4@SiO2/GO/CS/MPTS) was reported for the effective removal of β-agonists and dyes as well as the disinfection of microorganisms in complex wastewater. The surface and textural properties of the nanocomposites were characterized through Fourier transform infrared spectrums (FT-IR), scanning electron micrographs (SEM), X-ray photoelectron spectra (XPS), vibrating sample magnetometry (VSM) and zeta-potential measurements analysis. And the influence of several parameters (pH, contact time, pollutants concentration and adsorbent dose) on the adsorptive performances of nanoparticles was carefully estimated by the batch adsorption studies. According to Langmuir isotherm, the maximum adsorption capacities of Fe3O4@SiO2/GO/CS/MPTS were 215.52, 263.85, 184.16, 558.66 and 613.50 mg g−1 for dopamine (DA), clenbuterol (CLE), orciprenaline (ORC), methylene blue (MB) and crystal violet (CV), respectively. The data of the adsorption kinetic and adsorption isotherm fitted well with pseudo-second order kinetic and Langmuir isotherm models, which indicating the existence of chemical adsorption and monolayer adsorption process. The adsorption mechanisms of β-agonists and dyes were ascribe to electrostatic interaction, π–π interaction and cation− π interaction. Moreover, the nanocomposite could be reused for four cycles for β-agonists and five cycles for dyes with minor loss of adsorption capacity. In addition to its excellent adsorption capacity, the as-prepared nanocomposite exhibited the highest antibacterial activity of 88.94% and 100% against E. coli and S. aureus at the nanomaterial concentration of 75 μg mL−1, as compared to GO showing 31.67% and 26.87% antibacterial activity for E. coli and S. aureus, respectively. Predictably, this magnetic nanomaterial with high adsorption efficiency and excellen