Gram-scale synthesis of electrochemically oxygenated graphene nanosheets for removal of methylene blue from aqueous solution

Abstract

In this study, oxygenated graphene nanosheets (OGNs) were successfully synthesized using a simple electrochemical exfoliation approach and applied to remove methylene blue (MB) in an aqueous solution. The surface morphology and structure of the OGNs were characterized by scanning electron microscopy, transmission electron microscopy, Raman, and x-ray photoelectron spectroscopy. The adsorption performance of OGNs towards aqueous MB was tested by batch experiments. Results showed that a large number of functional groups in OGNs enhanced the removal of MB from the aqueous solution due to the electrostatic interactions between the electrochemically oxygenated groups (e.g. C–OH, C–O, and C=O) and dye molecules. Using Langmuir adsorption isotherm, the maximum MB adsorption capacity (q max) was determined as high as 476.19 mg g−1. These results suggested that the as-prepared OGNs is an effective and promising adsorbent for removing MB, which could be studied extensively for color removal in wastewater treatment.

A unique approach for electrochemical determination of dopamine by turning off uric acid and ascorbic acid peaks

“…The G band at 1488.5 cm − 1 is associated with the graphitic quality of the sample. The presence of the 2D band located at 2630.3 cm − 1 is indicative of the formation of graphene [19,20]. The intensity ratio of the G and 2D band (I G /I 2D ) of the sample is 2.71, which indicates the formation of a few layers [21].…”

Preparation of CS-LS/AgNPs Composites and Photocatalytic Degradation of Dyes

“…These dyes are difficult to biodegrade due to their complex chemical nature and structure, and their dispersion in water is persistent [ 2 , 3 ]. The discharge of these dyes into water bodies is harmful to biodiversity and hurts human health [ 4 , 5 , 6 ]. Therefore, it is necessary to provide effective methods for removing dyes from wastewater.…”

Green and Facile Synthesis of Porous SiO2@C Adsorbents from Rice Husk: Preparation, Characterization, and Their Application in Removal of Reactive Red 120 in Aqueous Solution

“…Although a variety of methods have been applied for the dye removal, the adsorption technique is preferable due to its simplicity, simple unit assembly, high efficiency, and low cost. 4 Rice husk is considered to be the main waste produced in a large amount (e.g., approximately 9 million tons in Vietnam) from the rice industry. 5,6 Burning is the first choice for the treatment of this waste because of its simplicity and the ability to produce energy.…”

“…From the aspect of environmental safety, removing dyestuffs such as RR120 from wastewater is extremely necessary. Although a variety of methods have been applied for the dye removal, the adsorption technique is preferable due to its simplicity, simple unit assembly, high efficiency, and low cost …”

“…Although a variety of methods have been applied for the dye removal, the adsorption technique is preferable due to its simplicity, simple unit assembly, high efficiency, and low cost. 4 …”