Graphene oxide nanoplatelets synthesized with carbonized agro-waste biomass as green precursor and its application for the treatment of dye rich wastewater

Goswami, Sudipta; Banerjee, Priya; Datta, Siddhartha; Mukhopadhayay, Aniruddha; Das, Papita

doi:10.1016/j.psep.2017.01.003

Cited by 90 publications

(39 citation statements)

References 27 publications

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“…The SEM images of GONP revealed that it is composed of thin, closely associated and highly overlapping platelet-like carbon sheets. The rough surfaces of these crumpled GONPs reportedly facilitate efficient adsorption [40][41][42]. These wrinkled and layered structures of GO are reportedly formed as a result of interactions between oxygen containing functional groups [37].…”

Section: Resultsmentioning

confidence: 98%

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Removal of aqueous carbamazepine using graphene oxide nanoplatelets: process modelling and optimization

Bhattacharya

Banerjee

Das

et al. 2020

Sustain Environ Res

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Unplanned and unmonitored developmental activities have resulted in a rapid emergence of pollutants like pharmaceuticals and personal care products (PPCPs) in the environment. These PPCPs are considered as potential health hazards. A wide variety of physical, biological and chemical processes are presently being investigated for ensuring the efficient removal of such pollutants from effluents. The present study investigates the potential of graphene oxide nanoplatelets (GONPs) for removal of a common and extensively used drug, Carbamazepine (CBZ) from aqueous solutions. Batch studies were performed to assess the potential of graphene oxide for adsorption of CBZ under different conditions of initial CBZ concentration, adsorbent dosage, temperature and solution pH. Process optimization was performed using Response Surface Methodology and Artificial Neural Network modelling. Results obtained indicated 99% CBZ removal under optimum solution pH, adsorbent dosage and treatment duration of 6, 1 g L− 1 and 120 min respectively. Results revealed that CBZ adsorption by GONPs followed Temkin isotherm and pseudo second order kinetics. A subsequent reusability study established that the GONPs could be reused for up to 8 times without any loss of adsorption efficiency. Therefore, it can be concluded that graphene oxide reported herein has immense potential for adsorption of trace organic pollutants from aqueous phases.

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Section: Resultsmentioning

confidence: 98%

“…2c exhibit three prominent peaks at 12.7°, 25.6°and 42.6°(2θ). These peaks are considered as the characteristic peaks of GONPs [21,23,27,41].…”

Section: Resultsmentioning

confidence: 99%

Removal of aqueous carbamazepine using graphene oxide nanoplatelets: process modelling and optimization

Bhattacharya

Banerjee

Das

et al. 2020

Sustain Environ Res

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“…During this pyrolysis step also occurs intra and intermolecular rearrangement reactions that could lead to the formation of fairly big molecules 72 that could not favor the growth of graphene (for this reason, several reports have proposed the use of a second pyrolysis for the synthesis of graphene oxides). 73 Once plasma is on, it serves two functions: The substrate is cleaned by hydrogen radicals etching (removal of native oxides) for better exposure of metal sites and yields to the formation of the carbon ions/radicals.The carbon atoms/ions/radicals get deposited in the voids of the face-centered cubic structure of copper surface unit cells (it does not penetrate inside the structure due to the low solubility).The deposited carbon then forms bonds with nearby carbon atoms, forming nucleation islands that then get connected as the synthesis progresses with time. This represents the nucleation and growth steps (here, the growth of several graphene layers occurs).At longer times, the top layers in the structure start getting etched by the hydrogen radicals in plasma.…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Plasma Synthesis of Graphene from Mango Peel

et al. 2018

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The excess of mango peels is considered manufacturing waste in the sugar and juice industry. There is an increasing interest in looking for alternative ways to employ this waste to address this overload. Here, we show the efficient use of mango peels as a noncost carbon source for the synthesis of graphene. We demonstrate for the first time the synthesis of graphene on Cu substrates from mango peels, a biomass rich in pectin. It is observed that plasma presence is essential for the growth of graphene from mango peels. At 15 and 30 min of plasma exposure, we observed the presence of multilayered graphene, at longer plasma exposure, i.e., 60 min, there is the formation of monolayer graphene, attributed to the etching of multiple layers formed at short times due to long plasma exposure time. When employing this technique, precautions must be taken due to the etching effect of plasma, such as reducing either the plasma exposure time or the plasma power. Finally, we present a graphene growth pathway under plasma environment on the basis of our experimental observations.

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“…Various biomass resources can be considered as a proper candidate to obtain refined carbon; rice straw [11], corn stover [12], bamboo [13] or others [14]. In this work, industrial tea waste biomass was converted to carbon by pyrolysis, graphitization (oxygen reduction) and chemical treatment approaches.…”

Section: Introductionmentioning

confidence: 99%

Optical and electrical properties of refined carbon derived from industrial tea waste

Akgül

Bıçakçı

2020

Mater. Res. Express

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The utilization of nano-and well-ordered carbon materials such as graphene especially in carbonbased electrical devices and in energy storage areas is becoming important in terms of developing economical methods and reducing the dimensions of the electrical devices. These applied carbon materials are mostly originated from fossil sources which are diminishing. Hence, renewable carbon resources are gaining importance. Biomass is the single renewable carbon resource and can be refined to highly ordered carbon materials such as graphene by top to down methods. In this work, industrial tea waste biomass was converted to carbonized material by pyrolysis and refined by some further chemical treatments towards the ordered structured carbon. The newly derived refined carbon material was characterized by Raman, TGA, FTIR, SEM and XRD methods, and its optical and electrical properties were determined. The experimental results showed that the band gap energies of refined carbon derived from tea waste and reduced graphene oxide prepared in this study are in the similar level as 2.375 and 2.264 eV, respectively. Furthermore, the electrical conductivities are at the same stage as 3.16 and 3.28×10 −4 (1/Ω·cm) for reduced graphene oxide and refined carbon. The optically active and electrical conductive refined carbon material from biomass could be a proper carbon in energy related applications in terms of renewable and sustainable processing.

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Graphene oxide nanoplatelets synthesized with carbonized agro-waste biomass as green precursor and its application for the treatment of dye rich wastewater

Cited by 90 publications

References 27 publications

Removal of aqueous carbamazepine using graphene oxide nanoplatelets: process modelling and optimization

Removal of aqueous carbamazepine using graphene oxide nanoplatelets: process modelling and optimization

Plasma Synthesis of Graphene from Mango Peel

Optical and electrical properties of refined carbon derived from industrial tea waste

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