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Showing 4 results for Graphene Oxide
Catalytic degradation of Triclosan by using xenon light/GO @ TiO2 combination system: optimization of initial parameters
N Golchinpour, N Rastkari, R Nabizadeh Nodehi, M Abtahi, A Azari, E Iravani, K Yaghmaeian,
Volume 10, Issue 4 (3-2018)
Abstract
Background and Objective: Triclosan is one of the substances as anti-microbial that is used in many of these pharmaceutical products. This compound can affect human such as reduction of thyroid hormone levels, antibiotic resistant, and increasing skin cancer. This study evaluated the performance nanophotocatalysis process UV/Xe/TiO2-GO on triclosan removal from aqueous solutions.
Materials and Methods: Synthesis of TiO2@GO and its structure was analyzed by SEM, EDX and FTIR. The effects of pollutant concentration, catalyst dosage, and contact time on the removal of Triclosan were studied by DOE software according to response surface methodology. Analysis of variance test was considered for the influence of parameters. Optimum process condition was determined by desirability factor.
Results: Optimum conditions regarding concentration of pollutant, contact time, and catalyst dosage were determined as 0.205 g/L, 14.898 min, and 0.487 mg/L, respectively. Maximum removal efficiency in optimum condition was 97.542 percent. The catalyst dosage was the most effective parameter in removal of Triclosan.
Conclusion: Using of TiO2@GO and xenon lamp had acceptable efficiency for the removal of Triclosan. The use of Xenon lamps alone was economically affordable.  
 
Photocatalytic removal of amoxicillin from aqueous solution using magnetic graphene oxide functionalized with cerium dioxide nanocomposite
Nahid Rashtchi, Soheil Sobhanardakani, Mehrdad Cheraghi, Amirreza Goodarzi, Bahareh Lorestani,
Volume 15, Issue 2 (8-2022)
Abstract
Background and Objective: Amoxicillin (AMX) is one of the commonly used commercial antibiotics due to its high resistance to bacteria and its large spectrum against a wide variety of microorganisms, which it´s existence in the wastewater from pharmaceutical industries and hospital effluents causes unpleasant odor, skin disorder, and microbial resistance among pathogen organisms, and it can lead to the death of microorganisms which are effective in wastewater treatment. Therefore, this study was conducted to investigate of removal efficacy of AMX from aqueous solutions using GO@Fe3O4@CeO2.
Materials and Methods: In this descriptive study, GO@Fe3O4@CeO2 was synthesized and then used as a photocatalyst for the removal of AMX from aqueous solution. GO@Fe3O4@CeO2 was characterized using X-Ray Diffraction (XRD), Scanning Electronic Microscopy (SEM), SEM-EDX elemental analysis, Fourier transform infrared spectroscopy (FTIR), and vibrating sample magnetometry (VSM) methods. Additionally, the influence of variables including pH (3-11), amount of photocatalyst (0.006-0.04 g), contact time (0-150 min), and temperature (25-55 °C) was assessed on the efficacy of AMX removal. 
Results: The results indicated that removal efficiency increased up to 90 min contact time, 0.02 g of photocatalyst, and at the temperature of 25 °C. The optimum pH for AMX removal was 10.
Conclusion: GO@Fe3O4@CeO2 could be an effective and available photocatalyst for the removal of AMX from industrial wastewater under UV light.

Design of three-dimensional magnetically modified graphene oxide nanoparticles for humic acid removal from aqueous media
Sanaz Jafari, Amir Hossein Javid, Elham Moniri, Amir Hessam Hassani, Homayon Ahmad Panahi,
Volume 17, Issue 4 (3-2025)
Abstract
Background and Objective: Humic substances are a group of high molecular weight, heterogeneous organic macromolecules formed through biological and geochemical reactions. They are recognized as one of the main precursors of by-products in water treatment processes. Humic acid compounds create various issues in water and soil treatment industries, necessitating their effective removal from water sources. Due to their small size and their ability to separate environmental pollutants, magnetic nanoparticles are used in the treatment of toxic and hazardous pollutants and in remediating contaminated environments. This study aimed to investigate the removal efficiency of humic acid using a three-dimensional magnetic nanoadsorbent and to identify the optimal conditions for removal.
Materials and Methods: First, three-dimensional magnetic graphene oxide was synthesized, and then surface modification was carried out with allyl amine/allyl glycidyl ether. The characteristics of the synthesized magnetic nanoadsorbent were determined using field emission scanning electron microscopy and the surface charge zero point. The removal of humic acid from aqueous solutions on magnetic nanoadsorbent was assessed based on pH, nanoadsorbent dosage, contact time, and temperature, with optimal conditions identified using the Taguchi method. Additionally, the adsorption isotherms, kinetics, and thermodynamics of humic acid adsorption on the magnetic nanoabsorbent were determined, with data analyzed through linear regression and determination coefficients for isotherm comparisons. The reusability of the nanoadsorbent in the humic acid adsorption mechanism was also examined. Experimental studies was conducted on well water samples from Tehran and Manjilabad (Karaj).
Results: The analyses confirmed the structural characteristics and properties of the synthesized adsorbent. Optimal removal of humic acid was achieved at pH 6, an adsorbent dosage of 0.02 g, a contact time of 120 minutes, and a temperature of 25°C, resulting in a 98% removal efficiency. Results indicated that humic acid adsorption followed the Langmuir isotherm, with kinetics corresponding to a pseudo-second-order model, yielding correlation coefficients of 0.9969 and 0.9968, respectively. Thermodynamic data showed that humic acid adsorption by the nanoadsorbent is an endothermic and favorable process.
Conclusion: The use of this nanoadsorbent in removing humic acid from aqueous solutions can be considered as an efficient method. Magnetic nanoabsorbents offer the advantages of easy separation from suspensions using a magnetic field, potential recovery through various methods, and reusability.
 

Ecotoxicological assessment of mixture exposure to silver and graphene oxide nanoparticles, case study: histopathology effects of gill and intestine tissues of guppy fish (Poecilia reticulata)
Naseh Babakhani, Soheil Sobhanardakani, Borhan Mansouri, Mehrdad Cheraghi, Bahareh Lorestani,
Volume 18, Issue 1 (5-2025)
Abstract
Background and Objective: Growing concerns exist regarding the impact of nanoparticles on organisms and environmental health. This study aimed to investigate the effects of silver and graphene oxide nanoparticles on the gill and intestinal tissues of guppy fish (Poecilia reticulata) during acute toxicity exposure.
Materials and Methods: The acute toxicity (LC50) for both nanoparticles was calculated over a 96-hour period using Probit software. Histopathological examination of the gill and intestinal tissues exposed to the nanoparticles was performed using the hematoxylin-eosin staining method. A semi-quantitative approach was employed to assess the severity of tissue damage.
Results: The LC50 values for silver nanoparticles, graphene oxide nanoparticles, and their combination were determined to be 2.6 mg/L, 65.2 mg/L, and 1.8 mg/L, respectively. Simultaneous exposure to these nanoparticles exhibited a cumulative acute toxicity effect on fish tissues, with the severity increasing progressively from 24 to 96 hours. Notable injuries included hyperplasia, fusion, and adhesion of secondary lamellae in the gill tissue, as well as villi fusion, structural expansion of villi, increased blood cell count, and erosion in the intestinal tissue of the fish.
Conclusion: Simultaneous exposure to silver and graphene oxide nanoparticles significantly increases the acute toxicity in guppy fish. This study highlights the need for further research to fully understand the implications of nanoparticle exposure across the food chain.
 

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