Preparation of cubic Cu2O nanoparticles wrapped by reduced graphene oxide for the efficient removal of rhodamine B

Huang, Hui; Zhang, Jie; Lian, Jiqin; Zang, Zhigang

doi:10.1016/j.jallcom.2017.05.132

Cited by 257 publications

(40 citation statements)

References 22 publications

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“…Graphene -the first and the smallest two-dimensional atomic crystal -attracted much attention to scientific research in the field of optoelectronics, used in many applications including photoluminescence bio-imaging [4], X-ray photon detection [5], photo-catalytic activities [6], photoconductive switching [7]. Graphene quantum dot (GQD) is a 0D nanomaterial that contains small pieces of few-layer graphene [8].…”

Section: Introductionmentioning

confidence: 99%

Optical graphene quantum dots gas sensors: experimental study

Raeyani

Shojaei

Ahmadi-Kandjani

2020

Mater. Res. Express

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We present a room temperature Graphene Quantum Dots (GQDs) based optical gas sensor for carbon dioxide gas detection. GQDs were prepared by a hydrothermal method and deposited on a quartz substrate using a drop-casting technique. The size of synthesized GQDs is in the range of 10 to 20 nm. GQDs films were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), atomic force microscopy (AFM), photoluminescence (PL) and UV-Vis absorption spectroscopy. The gas sensing measurements were studied using optical absorbance changes of GQDs film upon exposure to different concentrations of CO 2 gas. The as-prepared gas sensor showed a significant sensitivity with a partially reversible response to CO 2 gas, indicating its great potential to pave a way toward a novel CO 2 gas sensor.

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Section: Introductionmentioning

confidence: 99%

Optical graphene quantum dots gas sensors: experimental study

Raeyani

Shojaei

Ahmadi-Kandjani

2020

Mater. Res. Express

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“…Although metal sulfides show fairly well electrical conductivity but the electrochemical performance can be further enhanced by realizing higher electrical conductivity and specific surface area values. Carbonaceous materials (e. g., graphene oxide (GO)), exhibit a variety of potential applications, e. g., photoelectrocatalytic activity and vivo‐bio imaging, which are due to the large specific surface area and high electrical conductivity . Hence, with the use of GO, the improved electrochemical nature of the electrodes in supercapacitors could be anticipated ,,,.…”

Section: Introductionmentioning

confidence: 99%

Effect of Graphene Oxide Thin Film on Growth and Electrochemical Performance of Hierarchical Zinc Sulfide Nanoweb for Supercapacitor Applications

et al. 2018

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Surface morphology induced electrical conductivity and specific surface area of a material play a significant role to facilitate electrochemical behavior for supercapacitor application. Therefore, the synthesis step for controlling such parameters becomes very imperative and challenging. Herein, a ZnS nanoweb is deposited directly onto Ni foam with a pre‐deposited thin layer of hydrothermally prepared graphene oxide. The structure and surface morphology of the deposited ZnS is observed using XRD and SEM, respectively. The electrical conductivity of the graphene oxide supported ZnS nanoweb, determined using the four probes method, is 100.15 S cm−1. The specific surface area is 104.42 m2 g−1 as determined by BET measurements. Pseudocapacitive behavior is monitored by cyclic voltammetry, and the excellent specific capacity of 3052 Fg−1 has been found at a scan rate of 2 mV s−1, while it is 2400.30 Fg−1 according the galvanostatic charge‐discharge profile at a current density of 3 mA cm−2. Both values are significantly higher than those measured for bare GO or ZnS layers. The energy and power densities of GO supported ZnS nanoweb are determined in a three electrode setup, are 120 Wh Kg−1 at 3 mA cm−2 and 4407.73 Wkg−1, respectively. In a symmetric two electrode setup, an energy density of 20.29 Wh Kg−1 at 2 mA cm−2 is observed. Hence, both symmetric and asymmetric measurements suggest that GO supported ZnS nanoweb can be applied as a suitable electrode for supercapacitors.

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“…Various strategies such as ion exchange, photocatalytic activity, chemical precipitation, membrane filtration, and others as detailed in recent reviews have been applied for removing metal ions and/or dyes from aqueous solutions. Adsorption is one of the commonly used technique due to its low cost, high efficiency, and simplicity .…”

Section: Introductionmentioning

confidence: 99%

Polymer‐derived ceramic adsorbent for pollutant removal from water

2018

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Polymer‐derived ceramic components (SiOC, sample W) were produced from preceramic polymer mixture and a catalyst. After curing and pyrolysis, some of the samples etched by hydrofluoric acid to obtain carbonaceous SiOC (C‐rich SiOC, sample W‐HF). W and W‐HF were tested as an adsorbent material to remove both heavy‐metal ions (Cr (III), Pb (III), and Cd (II)) and cationic dyes (Methylene Blue (MB), Rhodamine B (RB), and Crystal Violet (CV)) from aqueous solutions. HF‐treated high surface area SiOC samples had quite high adsorption affinity for cationic dyes. According the Langmuir isotherm model the maximum dye uptake values were found to be around to 50 mg/g for sample W, whereas those for sample W‐HF ranged from 104 to 186 mg/g. Regeneration studies were conducted both by heat treatment and leaching, high recovery yields (always above 97%) of MB adsorption were obtained.

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Preparation of cubic Cu2O nanoparticles wrapped by reduced graphene oxide for the efficient removal of rhodamine B

Cited by 257 publications

References 22 publications

Optical graphene quantum dots gas sensors: experimental study

Optical graphene quantum dots gas sensors: experimental study

Effect of Graphene Oxide Thin Film on Growth and Electrochemical Performance of Hierarchical Zinc Sulfide Nanoweb for Supercapacitor Applications

Polymer‐derived ceramic adsorbent for pollutant removal from water

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