Adsorption behaviour of reduced graphene oxide towards cationic and anionic dyes: Co-action of electrostatic and π – π interactions

Minitha, Cherukutty Ramakrishnan; Lalitha, M.; Jeyachandran, Y.L.; Senthilkumar, L.; Kumar, Ramasamy Thangavelu Rajendra

doi:10.1016/j.matchemphys.2017.03.048

Cited by 217 publications

(20 citation statements)

References 44 publications

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“…From Figure 2a, it was revealed that upon oxidation of graphite flakes, the (002) plane at 26.5° was shifted to (001) at 10.5° with complete intercalation of oxygen functionalities. 20 By the reduction of GO, the (001) plane shifted from 14.2° to 24.1° for 10 min (RG1) and 24.19° for 15 h (RG3). It was confirmed that in the case RG1, there was only a partial reduction occurring during 10 min, and for RG3, the (002) plane resorted to graphite nature at 15 h. It was observed that RG1 and RG3 have a diffraction peak at 43.1°, which could be attributed to short-range ordering in stacked graphene layers.…”

Section: Results and Discussionmentioning

confidence: 97%

Impact of Oxygen Functional Groups on Reduced Graphene Oxide-Based Sensors for Ammonia and Toluene Detection at Room Temperature

et al. 2018

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The chemically reduced graphene oxide (rGO) was prepared by the reduction of graphene oxide by hydrazine hydrate. By varying the reduction time (10 min, 1 h, and 15 h), oxygen functional groups on rGO were tremendously controlled and they were named RG1, RG2, and RG3, respectively. Here, we investigate the impact of oxygen functional groups on the detection of ammonia and toluene at room temperature. Their effect on sensing mechanism was analyzed by first-principles calculation-based density functional theory. The sensing material was fabricated, and the effect of reduction time shown improved the recovery of ammonia and toluene sensing at room temperature. Structural, morphological, and electrical characterizations were performed on both RG1 and RG3. The sensor response toward toluene vapor of 300 ppm was found to vary 4.4, 2.5, and 3.8% for RG1, RG2, and RG3, respectively. Though RG1 shows higher sensing response with poor recovery, RG3 exhibited complete desorption of toluene after the sensing process with response and recovery times of approximately 40 and 75 s, respectively. The complete recovery of toluene molecules on RG3 is due to the generation of new sites after the reduction of oxygen functionalities on its surface. It could be suggested that these sites provided anchor to ammonia and toluene molecules and good recovery under N 2 purge. Both theoretical and experimental studies revealed that tuning the oxygen functional groups on rGO could play a vital role in the detection of volatile organic compounds (VOCs) on rGO sheets and was discussed in detail. This study could provoke knowledge about rGO-based sensor dependency with oxygen functional groups and shed light on effective monitoring of VOCs under ambient conditions for air quality monitoring applications.

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Section: Results and Discussionmentioning

confidence: 97%

Impact of Oxygen Functional Groups on Reduced Graphene Oxide-Based Sensors for Ammonia and Toluene Detection at Room Temperature

et al. 2018

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“…Hence, the adsorption performance of graphene-based materials still needs to be improved and the cost lowered. Some reports showed that oxygen functional groups, vacancy defects and π–π interactions on the graphene basal planes and edges can enhance the adsorption capacities for pollutants [3,20]. We inferred that organic molecules modifying graphene might improve their adsorption capabilities.…”

Section: Introductionmentioning

confidence: 79%

“…Recently, graphene-based materials have drawn attention because of their huge specific surface area, extraordinary electronic transport properties and unique adsorption properties [1–3]. These materials have important applications in many fields, including physics [4], electrochemistry [5], environmental science [6] and catalysis [7].…”

Section: Introductionmentioning

confidence: 99%

L-Lysine-grafted graphene oxide as an effective adsorbent for the removal of methylene blue and metal ions

Yan¹,

Li²,

Kong³

et al. 2017

Beilstein J. Nanotechnol.

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In this paper, novel L-lysine-modified graphene oxide (Lys-GO) was synthesized through amidation. The morphological and structural properties of Lys-GO were characterized using infrared spectrometry, scanning electronic microscopy and X-ray photoelectron spectroscopy. The as-prepared Lys-GO material was systematically investigated in a series of batch adsorption experiments for the removal of methylene blue (MB) and copper ions (Cu2+) from wastewater. These results showed that Lys-GO is a bifunctional adsorbent for the removal of dyes and metal ions, and excellent adsorption efficiency was obtained. The maximum adsorption capacities for MB dye and Cu2+ were 1679.1 mg/g and 186.9 mg/g at 35 °C, respectively. The kinetics of adsorption followed well the linear pseudo-second-kinetic model. The isotherm results indicated that MB adsorption can be described with the Langmuir isotherm model, while the adsorption of Cu2+ can be described with the Freundlich model. The excellent adsorption capacity indicated that the Lys-GO may be a promising adsorption material for the removal of environmental pollutants.

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“…Such a specific feature enables adsorption of the anionic and cationic dye molecules on the nanosheets' surface through the π-π stacking between the dyes' delocalized π-bond and the adsorbent. Minitha et al [153] studied Figure 10. The AO8 and DR23 dyes are adsorbed onto GO via (a) electrostatic interaction between the protonated hydroxyl and carboxyl groups of GO and the anionic dyes, and via (b) H-bonding and π-π stacking.…”

Section: D Carbonaceous Nano-adsorbentsmentioning

confidence: 99%

“…Such a specific feature enables adsorption of the anionic and cationic dye molecules on the nanosheets' surface through the π-π stacking between the dyes' delocalized π-bond and the adsorbent. Minitha et al [153] studied the adsorption behavior of MB and MO on rGO experimentally and theoretically via the density functional theory (DFT). In this study, rGO shows a high but comparable adsorption efficiency for both cationic MB and anionic MO dyes, attributed to the present vacancies and/or conjugated structure of rGO, alongside electrostatic interaction.…”

Section: D Carbonaceous Nano-adsorbentsmentioning

confidence: 99%

The Nanosized Dye Adsorbents for Water Treatment

Homaeigohar

2020

Nanomaterials

139

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Clean water is a vital element for survival of any living creature and, thus, crucially important to achieve largely and economically for any nation worldwide. However, the astonishingly fast trend of industrialization and population growth and the arisen extensive water pollutions have challenged access to clean water across the world. In this regard, 1.6 million tons of dyes are annually consumed. Thereof, 10%–15% are wasted during use. To decolorize water streams, there is an urgent need for the advanced remediation approaches involving utilization of novel materials and technologies, which are cost and energy efficient. Nanomaterials, with their outstanding physicochemical properties, can potentially resolve the challenge of need to water treatment in a less energy demanding manner. In this review, a variety of the most recent (from 2015 onwards) opportunities arisen from nanomaterials in different dimensionalities, performances, and compositions for water decolorization is introduced and discussed. The state-of-the-art research studies are presented in a classified manner, particularly based on structural dimensionality, to better illustrate the current status of adsorption-based water decolorization using nanomaterials. Considering the introduction of many newly developed nano-adsorbents and their classification based on the dimensionality factor, which has never been employed for this sake in the related literature, a comprehensive review will be presented.

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Adsorption behaviour of reduced graphene oxide towards cationic and anionic dyes: Co-action of electrostatic and π – π interactions

Cited by 217 publications

References 44 publications

Impact of Oxygen Functional Groups on Reduced Graphene Oxide-Based Sensors for Ammonia and Toluene Detection at Room Temperature

Impact of Oxygen Functional Groups on Reduced Graphene Oxide-Based Sensors for Ammonia and Toluene Detection at Room Temperature

L-Lysine-grafted graphene oxide as an effective adsorbent for the removal of methylene blue and metal ions

The Nanosized Dye Adsorbents for Water Treatment

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