Silver nanoparticles-assembled graphene oxide sheets on TiO 2 nanotubes: synthesis, characterization, and photocatalytic
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ORIGINAL ARTICLE
Silver nanoparticles‑assembled graphene oxide sheets on TiO2 nanotubes: synthesis, characterization, and photocatalytic investigation Thuy Loan Pham Thi1 · Duy Khang Nguyen Vu2 · Phuong Anh Nguyen Thi2 · Dang Khoa Vo Nguyen1,2 Received: 17 April 2020 / Accepted: 5 May 2020 © King Abdulaziz City for Science and Technology 2020
Abstract In this study, graphene oxide (GO) sheets were assembled with silver nanoparticles (AgNPs) and then combined with T iO2 nanotubes (TNTs) by γ-ray irradiation at different doses (5, 10, 15, 20, and 25 kGy), to form GO–AgNPs–TNTs nanocomposites. Their physical and chemical properties were investigated using Fourier-transformed infrared, ultraviolet–visible (UV–Vis) adsorption, Raman and X-ray diffraction (XRD) spectroscopies. Field emission scanning electron and transmission electron (TEM) microscopies were applied for their morphology and structure observation. The obtained results indicated successful assemblage of silver nanoparticles on both GO sheets and TNTs, as well as significant effects of irradiation dose on nanocomposites’ characteristics. Photocatalytic activity of the material was determined by the photodegradation efficiency on rhodamine B dye solution. All nanocomposite samples were revealed to possess good photocatalytic activity, with the highest obtained decoloration efficiency value of 81.21%. Noticeably, the photocatalytic activity of all nanocomposite samples was higher than that of their sole components. With all obtained results, γ-ray irradiation was demonstrated to be a good technique for the synthesis of nanocomposite materials and GO–AgNPs–TNTs nanocomposite proclaimed high potential for pollutants removal and wastewater purification. Keywords Silver nanoparticles · Graphene oxide · TiO2 nanotubes · Photocatalytic activity
Introduction Micro-pollutants in water, such as heavy metals, dyes, fertilizers, pharmaceuticals, pesticides, and other additives, are no doubt a persistent threat to both human and environmental health. Noticeably, the wide use of toxic and corrosive slurries in conventional industries fostered water contamination and, therefore, made this issue more severe. To overcome this challenge, nanomaterials have been used to develop novel environment-friendly chemical and mechanical polishing slurries (Zhang et al. 2018, 2019, 2020a, b), diamond wheels (Zhang et al. 2012a, b, 2013), as well as * Dang Khoa Vo Nguyen [email protected] 1
Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Street, Nghia Do Ward, Cau Giay District, Hanoi, Vietnam
Institute of Applied Material Science, Vietnam Academy of Science and Technology, 01A Thanh Loc 29 Street, Thanh Loc Ward, District 12, Ho Chi Minh City, Vietnam
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machining methods (Zhang et al. 2015a, b; Wang et al. 2018). Such slurries and techniques have been applied in the fabrication of high-performance apparatuses, which are challenging to be manufactured by conventional engineering (Zhang et al. 2017). These
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