SnO2/reduced graphene oxide nanocomposites for highly efficient photocatalytic degradation of methylene blue

Tuấn, Phạm Văn; Tuong, Hoang Ba; Tan, Vu Thi; Thu, Luong Hoai; Khoang, Nguyen Duc; Khiem, Tran Ngoc

doi:10.1016/j.optmat.2021.111916

Cited by 26 publications

(24 citation statements)

References 58 publications

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“…The basic mechanism of the work is displayed in Figure 27. 166 A metal−organic framework (MOF) composite with graphene, i.e., MIL-68(In)-NH 2 /GO has been reported to exhibit increased photocatalytic activity for amoxicillin (AMX) degradation. The enhanced activity (93% degradation) for the composite has been attributed to GO which acts as an efficient electron transporter.…”

Section: Photocatalytic Behavior Of Graphene Oxidementioning

confidence: 99%

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An Update on Graphene Oxide: Applications and Toxicity

et al. 2022

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Graphene oxide (GO) has attracted much attention in the past few years because of its interesting and promising electrical, thermal, mechanical, and structural properties. These properties can be altered, as GO can be readily functionalized. Brodie synthesized the GO in 1859 by reacting graphite with KClO 3 in the presence of fuming HNO 3 ; the reaction took 3−4 days to complete at 333 K. Since then, various schemes have been developed to reduce the reaction time, increase the yield, and minimize the release of toxic byproducts (NO 2 and N 2 O 4 ). The modified Hummers method has been widely accepted to produce GO in bulk. Due to its versatile characteristics, GO has a wide range of applications in different fields like tissue engineering, photocatalysis, catalysis, and biomedical applications. Its porous structure is considered appropriate for tissue and organ regeneration. Various branches of tissue engineering are being extensively explored, such as bone, neural, dentistry, cartilage, and skin tissue engineering. The band gap of GO can be easily tuned, and therefore it has a wide range of photocatalytic applications as well: the degradation of organic contaminants, hydrogen generation, and CO 2 reduction, etc. GO could be a potential nanocarrier in drug delivery systems, gene delivery, biological sensing, and antibacterial nanocomposites due to its large surface area and high density, as it is highly functionalized with oxygen-containing functional groups. GO or its composites are found to be toxic to various biological species and as also discussed in this review. It has been observed that superoxide dismutase (SOD) and reactive oxygen species (ROS) levels gradually increase over a period after GO is introduced in the biological systems. Hence, GO at specific concentrations is toxic for various species like earthworms, Chironomus riparius, Zebrafish, etc.

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Section: Photocatalytic Behavior Of Graphene Oxidementioning

confidence: 99%

“…of electrons and holes, and reducing the recombination of carriers, etc. The basic mechanism of the work is displayed in Figure …”

Section: Photocatalytic Behavior Of Graphene Oxidementioning

confidence: 99%

An Update on Graphene Oxide: Applications and Toxicity

et al. 2022

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“…Optical measurements of the tested photosensitizers were recorded immediately and a few days after treatment of the ticks show high absorbance, especially for methylene blue owing to their photostability and photoliability which suggested they can be used in sunlight for a long time. Methylene blue is stable enough to be used in sunlight and not easily degraded and needs additional help for its degradation as titanate nanoparticles [62] and graphene oxide or tin oxide [63][64][65].…”

Section: Discussionmentioning

confidence: 99%

Acaricide resistance and novel photosensitizing approach as alternative acaricides against the camel tick, Hyalomma dromedarii

Mohammed

Baz

Ibrahim

et al. 2022

Photochem Photobiol Sci

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The control of the camel tick, Hyalomma dromedarii is very crucial. This study evaluated the novel toxicity of photosensitizers and Phoxim insecticide against H. dromedarii males using the adult immersion tests. Ticks were subjected to sunlight for 10 min post-treatment (PT). The optical characters of the applied materials were determined by UV–Vis spectroscopy (250–900 nm wavelengths). The intensity of spectra decreased as dye concentration decreased. The optical bandgap energies of the dyes at different concentrations were not changed as the concentration changed and decreased as the absorption peak of individual dyes red-shifted. The mortalities 72 h PT reached 42.2%, 44.4%, 51.1%, 71.1%, 46.7%, 48.9%, 44.4%, and 55.6% for chlorophyllin, echinochrome, field stain, methylene blue, phthalocyanine, rhodamine 6G, riboflavin, and safranin, respectively. Methylene blue recorded the highest median lethal concentration (LC50 = 127 ppm) followed by safranin, field stain, rhodamine 6G, phthalocyanine, echinochrome riboflavin, and chlorophyllin (LC50 = 209, 251, 271, 303, 324, 332, and 362 ppm, respectively, 72 h PT). Their median lethal time, LT50, values PT with 240 ppm were 45, 87, 96, 72, 129, 115, 131, and 137 h, respectively. The relative toxicities of the LC50 values 72 h PT showed that chlorophyllin, echinochrome, field stain, methylene blue, phthalocyanine, rhodamine 6G, riboflavin, and safranin were 3.2, 3.6, 4.6, 9.1, 3.8, 4.3, 3.5, and 5.6 times, respectively, more effective than Phoxim. Methylene blue, safranin, and field stain showed a broad absorbance area indicating a large photoactivity and better phototoxicity and could be used as alternative agents to synthetic acaricides. Graphical Abstract

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“…After adding rGO, an emission peak at 402 nm was greatly reduced. Our results observed that the PL intensity of the SnO2-GO NCs system (black line) was lower than that of pure SnO2 NPs, which may be attributed to greater charge separation, a longer life of the electron–hole pair, and a higher efficiency of charge [ 52 ]. This process has the potential to be used in a large variety of applications including cancer treatment and the photocatalytic degradation of environmental contaminants.…”

Section: Resultsmentioning

confidence: 99%

One-Pot Synthesis of SnO2-rGO Nanocomposite for Enhanced Photocatalytic and Anticancer Activity

et al. 2022

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Metal oxide and graphene derivative-based nanocomposites (NCs) are attractive to the fields of environmental remediation, optics, and cancer therapy owing to their remarkable physicochemical characteristics. There is limited information on the environmental and biomedical applications of tin oxide-reduced graphene oxide nanocomposites (SnO2-rGO NCs). The goal of this work was to explore the photocatalytic activity and anticancer efficacy of SnO2-rGO NCs. Pure SnO2 NPs and SnO2-rGO NCs were prepared using the one-pot hydrothermal method. X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared (FTIR), UV–Vis spectrometry, photoluminescence (PL), and Raman scattering microscopy were applied to characterize the synthesized samples. The crystallite size of the SnO2 NPs slightly increased after rGO doping. TEM and SEM images show that the SnO2 NPs were tightly anchored onto the rGO sheets. The XPS and EDX data confirmed the chemical state and elemental composition of the SnO2-rGO NCs. Optical data suggest that the bandgap energy of the SnO2-rGO NCs was slightly lower than for the pure SnO2 NPs. In comparison to pure SnO2 NPs, the intensity of the PL spectra of the SnO2-rGO NCs was lower, indicating the decrement of the recombination rate of the surfaces charges (e−/h+) after rGO doping. Hence, the degradation efficiency of methylene blue (MB) dye by SnO2-rGO NCs (93%) was almost 2-fold higher than for pure SnO2 NPs (54%). The anticancer efficacy of SnO2-rGO NCs was also almost 1.5-fold higher against human liver cancer (HepG2) and human lung cancer (A549) cells compared to the SnO2 NPs. This study suggests a unique method to improve the photocatalytic activity and anticancer efficacy of SnO2 NPs by fusion with graphene derivatives.

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SnO2/reduced graphene oxide nanocomposites for highly efficient photocatalytic degradation of methylene blue

Cited by 26 publications

References 58 publications

An Update on Graphene Oxide: Applications and Toxicity

An Update on Graphene Oxide: Applications and Toxicity

Acaricide resistance and novel photosensitizing approach as alternative acaricides against the camel tick, Hyalomma dromedarii

One-Pot Synthesis of SnO2-rGO Nanocomposite for Enhanced Photocatalytic and Anticancer Activity

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