Synthesis and characterization of graphene oxide-doped nano-hydroxyapatite and its adsorption performance of toxic diazo dyes from aqueous solution

Prabhu, Subbaiah Muthu; Khan, Abuzar; Farzana, Maisha; Hwang, Gil Chan; Lee, Woojin; Lee, Giehyeon

doi:10.1016/j.molliq.2018.08.044

Cited by 62 publications

(18 citation statements)

References 46 publications

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“… 14 , 15 , 21 This may be due to that the GO surface lacks active functional groups, and only π–π interaction happened between the dye molecules and the adsorbents. 14 , 15 On the other hand, the adsorption capacity of azo dyes by the as-prepared AQS@rGO were further decreased. As shown in Figure S2 , the removal efficiencies of AB113, RB5, and MO by AQS@rGO in 72 h of incubation time were less than 1, 2, and 6%, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…Graphene oxide (GO) may be a good precursor for the purpose due to the characteristics of abundant functional groups, nanoscale size, and large specific surface area. 13 , 14 Preparation and modification of the graphene-based nanocomposites showed great potential in pollution control technologies, especially in adsorption. 15 − 17 On the other hand, anthraquinone-2-sulfonate (AQS) was known to enhance the efficiency of extracellular electron transfer in many previous studiesdue to the active redox properties of the quinoid structure.…”

Section: Introductionmentioning

confidence: 99%

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Efficient Biodegradation of Azo Dyes Catalyzed by the Anthraquinone-2-sulfonate and Reduced Graphene Oxide Nanocomposite

Song

et al. 2020

ACS Omega

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An anthraquinone-2-sulfonate and reduced graphene oxide nanocomposite (AQS@rGO) was prepared and the improvement on the biotic reduction of a pollutant, i.e. , azo dye, was demonstrated. Electron paramagnetic resonance signal of the semi-quinone radical in the well-dispersed solid AQS@rGO solution was detected. Although the as-prepared AQS@rGO has a negligible adsorption capacity toward methyl orange (MO) dye, the decolorization efficiencies in both flask experiments and sequencing operation reactors in the presence of AQS@rGO were increased by more than 1.5 times as compared to that with graphene oxide, and an efficient and continuable catalytic effect on the decolorization of azo dyes in seven operation periods was maintained. The catalytic effect on reduction was caused by the formation of a space-charge layer, which facilitates the efficient e – transfer from the conductive rGO sheets to the C=O of the AQS molecule. The results suggested that the AQS@rGO may act as an efficient insoluble redox mediator, which is important for the pollution control by accelerating the extracellular electron transfer.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Efficient Biodegradation of Azo Dyes Catalyzed by the Anthraquinone-2-sulfonate and Reduced Graphene Oxide Nanocomposite

Song

et al. 2020

ACS Omega

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“…Leather residues from footwear industry were obtained from Industrias Wilches S.A. (Bogota, Colombia), cut into pieces and then milled (particle size about 3.4mm for L1 and 6.8mm for L2) in a The removal of these dyes using chemical reagents and microorganisms is a difficult process due to its complex molecular structure and stability against these kind of degradations as they are designed to be resistant to degradation or vanishing by agents [2,4]. Thus, many types of removal technology have been developed, such as adsorption, membrane filtration, chemical precipitation, ion exchange, flocculation, ultrafiltration, photocatalysis, ozonation techniques, and decomposition by microorganisms [2,[8][9][10][11][12][13][14][15][16][17]. However, adsorption method has proven to be a promising method due to its efficiency, relatively low cost, reusability, and easy operation [9,18].…”

Section: Adsorbentsmentioning

confidence: 99%

“…Specifically, wastewater from manufacturing industries that use large amount of dyes are generating abundant quantities of colored wastewater. Due to this, aquatic ecosystems have been severely impacted not only by the toxic, mutagenic and carcinogenic effects but also for the water quality due to changes in nutrients, inorganic sediments, and micropollutants [1][2][3][4]. Congo Red (CR) is an anionic dye that contains a benzidine compound (Figure 1), a carcinogenic and mutagenic substance.…”

Section: Introductionmentioning

confidence: 99%

Functionalized Leather: A Novel and Effective Hazardous Solid Waste Adsorbent for the Removal of the Diazo Dye Congo Red from Aqueous Solution

Clavijo

Osma

2019

Water

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The leather industry produces a high yield of solid hazardous wastes that generate a major impact on the environment. At the same time, the use of dyes by different manufacturing industries, including the footwear industry, creates large amounts of colored wastewater that is hard to treat. In this paper, potential adsorbents based on the functionalization of solid waste from leather in the removal of anionic dye Congo Red were studied. Twelve different functionalized adsorbents were analyzed in terms of dye removal. From those, the best adsorbents were characterized and tested to determine their life cycle, pH dependency and the resulting phytotoxicity of the treated dye baths. Different kinetic models were evaluated to describe this adsorption process. It was found that functionalized leather adsorbents presented multi-linearity behavior when removing Congo Red. Life cycle analysis showed that the adsorbents presented a high yield of absorption until the third cycle of operation, while phytotoxicity tested showed reductions up to 50% in the toxicity of the treated dye baths.

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“…Amyloid fibers bind to Congo red, giving the effect of apple-green birefringence under a polarized light microscope, which remains the gold standard in recognizing amyloid deposits. 7 , 8 Congo red is also often used as a model dye in evaluating the effectiveness of various materials that catalyze the degradation of organic pollutants in water. 9 , 10 The structure of Congo red is symmetrical.…”

Section: Introductionmentioning

confidence: 99%

Impact of Doxorubicin on Self-Organization of Congo Red: Quantum Chemical Calculations and Molecular Dynamics Simulations

et al. 2020

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Quantum-chemical calculations and molecular dynamics simulation were applied to a model self-organization process of Congo red (CR) molecules in aqueous solution and the impact of doxorubicin (DOX) molecules on such a process. It was demonstrated that both pure CR/CR and mixed CR/DOX dimers were stable. Van der Waals interactions between aromatic units were responsible for a stacked dimer formation. An important source of stabilization in the CR/CR dimer was the polarization energy. In the CR/DOX mixed dimer long range, electrostatic interactions were the main driving force leading to complexation. An implicit solvent model showed that the formation of the CR/CR dimer was favored over the CR/DOX one. Molecular dynamics simulations demonstrated rapid complexation. In the pure CR system, short sequences of ribbon-like structures were formed. Such structures might be glued by hydrogen bonds to form bigger complexes. It was shown that the aromatic part of the DOX molecule enters CR ribbons with the sugar part covering the CR ribbons. These findings demonstrated that CR may find applications as a carrier in delivering DOX molecules; however, further more extensive investigations are required.

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Synthesis and characterization of graphene oxide-doped nano-hydroxyapatite and its adsorption performance of toxic diazo dyes from aqueous solution

Cited by 62 publications

References 46 publications

Efficient Biodegradation of Azo Dyes Catalyzed by the Anthraquinone-2-sulfonate and Reduced Graphene Oxide Nanocomposite

Efficient Biodegradation of Azo Dyes Catalyzed by the Anthraquinone-2-sulfonate and Reduced Graphene Oxide Nanocomposite

Functionalized Leather: A Novel and Effective Hazardous Solid Waste Adsorbent for the Removal of the Diazo Dye Congo Red from Aqueous Solution

Impact of Doxorubicin on Self-Organization of Congo Red: Quantum Chemical Calculations and Molecular Dynamics Simulations

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