Comparative study of methylene blue dye adsorption onto activated carbon, graphene oxide, and carbon nanotubes
TL;DR: In this paper, three different carbonaceous materials, activated carbon, graphene oxide, and multi-walled carbon nanotubes, were modified by nitric acid and used as adsorbents for the removal of methylene blue dye from aqueous solution.
Abstract: Three different carbonaceous materials, activated carbon, graphene oxide, and multi-walled carbon nanotubes, were modified by nitric acid and used as adsorbents for the removal of methylene blue dye from aqueous solution. The adsorbents were characterized by N2 adsorption/desorption isotherms, infrared spectroscopy, particle size, and zeta potential measurements. Batch adsorption experiments were carried out to study the effect of solution pH and contact time on dye adsorption properties. The kinetic studies showed that the adsorption data followed a pseudo second-order kinetic model. The isotherm analysis indicated that the adsorption data can be represented by Langmuir isotherm model. The remarkably strong adsorption capacity normalized by the BET surface area of graphene oxide and carbon nanotubes can be attributed to π–π electron donor acceptor interaction and electrostatic attraction.
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TL;DR: This critical review assesses the recent developments in the use of graphene-based materials as sorbent or photocatalytic materials for environmental decontamination, as building blocks for next generation water treatment and desalination membranes, and as electrode materials for contaminant monitoring or removal.
Abstract: Graphene-based materials are gaining heightened attention as novel materials for environmental applications The unique physicochemical properties of graphene, notably its exceptionally high surface area, electron mobility, thermal conductivity, and mechanical strength, can lead to novel or improved technologies to address the pressing global environmental challenges This critical review assesses the recent developments in the use of graphene-based materials as sorbent or photocatalytic materials for environmental decontamination, as building blocks for next generation water treatment and desalination membranes, and as electrode materials for contaminant monitoring or removal The most promising areas of research are highlighted, with a discussion of the main challenges that we need to overcome in order to fully realize the exceptional properties of graphene in environmental applications
1,158 citations
TL;DR: It is evident from the literature that CNT based nanosorbents have shown good potential for the removal of dyes from aqueous solution, however, still more research work should be focused on the development of cost effective, higher efficient and environmental friendly CNTbased nanOSorbents for their commercial applications.
1,028 citations
TL;DR: The real wastewater experiment, the regeneration study and the comparative cost analysis showed that the RL-GO composites could be a cost-effective and promising sorbent for MB wastewater treatment owing to its high efficiency and excellent reusability.
509 citations
Cites background or result from "Comparative study of methylene blue..."
...The adsorption of methylene blue (MB) onto GO from aqueous solution was investigated in many studies (Li et al., 2013a; Yang et al., 2011; Zhang et al., 2011)....
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...This is similar to what was observed by Li et al. (Li et al., 2013a)....
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...Although quite a few functionalized GO have been developed, the adsorption capacity for MB of these functionalized GO is still low (Fan et al., 2012; Li et al., 2013b)....
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...This is mainly because a higher adsorbent dosage provides a large excess of the active sites leading to a lower utility of the sites at a certain concentration of MB solution (Li et al., 2013b)....
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...…this value is also much higher than other adsorbents such as cotton stalk (Deng et al., 2011), carbon nanotube (Yao et al., 2010), graphene (Liu et al., 2012a), graphene coated biochar (Zhang et al., 2012), graphene oxide (Li et al., 2013a) and magnetic chitosan/graphene oxide (Fan et al., 2012)....
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TL;DR: A synthesis of the current knowledge available on this broad and versatile family of graphene nanomaterials for removal of dyes, potentially toxic elements, phenolic compounds and other organic chemicals from aquatic systems is presented.
413 citations
TL;DR: An exhaustive examination of current research trends with a focus on nanomaterials (NMs) to considerably improve the performance of classical wastewater treatment technologies, e.g. adsorption, catalysis, separation, and disinfection is undertaken.
Abstract: The efficient handling of wastewater pollutants is a must, since they are continuously defiling limited fresh water resources, seriously affecting the terrestrial, aquatic, and aerial flora and fauna. Our vision is to undertake an exhaustive examination of current research trends with a focus on nanomaterials (NMs) to considerably improve the performance of classical wastewater treatment technologies, e.g. adsorption, catalysis, separation, and disinfection. Additionally, NM-based sensor technologies are considered, since they have been significantly used for monitoring water contaminants. We also suggest future directions to inform investigators of potentially disruptive NM technologies that have to be investigated in more detail. The fate and environmental transformations of NMs, which need to be addressed before large-scale implementation of NMs for water purification, are also highlighted.
397 citations
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TL;DR: It is evident from a literature survey of about 185 recently published papers that low-cost adsorbents have demonstrated outstanding removal capabilities for MB, and these include agricultural wastes, industrial solid wastes, biomass, clays minerals and zeolites.
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