Optimization of the combined ultrasonic assisted/adsorption method for the removal of malachite green by gold nanoparticles loaded on activated carbon: Experimental design

Roosta, Mostafa; Ghaedi, Mehrorang; Shokri, Narges; Daneshfar, Ali; Sahraei, Reza; Asghari, Alireza

doi:10.1016/j.saa.2013.08.082

Cited by 203 publications

(100 citation statements)

References 49 publications

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“…A solution of AgNO 3 reaction mixture was slowly stirred at room temperate for 24 hours. The color of the reaction mixture was changed from colorless to yellow and finally to black, indicating that AgNPs were formed.…”

Section: Resultsmentioning

confidence: 99%

“…The vessels were placed in the corresponding rotor, fixed by screwing down the upper rotor properties that are significantly different from those of bulk materials. [1][2][3][4][5] Silver nanoparticles (AgNPs) are one of the most attractive inorganic materials not only because of their broad application in catalysis, 6 34 and sodium borohydride). 35 The shape, size, and size distribution depend on the tendency of organic substrates to reduce the silver ions.…”

Section: Introductionmentioning

confidence: 99%

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Facile method for the synthesis of silver nanoparticles using 3-hydrazino-isatin derivatives in aqueous methanol and their antibacterial activity

El‐Faham¹,

Elzatahry²,

ALOthman³

et al. 2014

IJN

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Introduction A new method for preparation of silver nanoparticles (AgNPs) based on using hydrazino-isatin derivatives in an aqueous methanol reaction medium is reported here. AgNPs were prepared using silver nitrate solubilized in a water core as the source of silver ions and 3-hydrazino-isatin derivatives (3-hydrazino-isatin [IsH] and 1-benzyl-3-hydrazino-isatin [BIsH]) solubilized in methanol core as a reducing agent. The proposed method is effective, rapid, and convenient. X-ray diffraction (XRD), energy dispersive X-ray analysis, scanning electron microscope (SEM) and transmission electron microscopy (TEM) were used for characterization of the AgNPs. The TEM micrographs confirmed that the nanopowders consist of well-dispersed agglomerates of grains with a narrow size distribution of 18–21 nm and 17–20 nm. The AgNPs, as well as BIsH, showed high antimicrobial and bactericidal activity against the Gram-positive Bacillus subtilis and Gram-negative Micrococcus luteus and Proteus vulgaris , as well as antifungal activities against Saccharomyces cerevisiae . On the other hand, they were not effective against the Gram-negative Escherichia coli . Purpose A simple, effective, rapid, and convenient chemical reduction method for the synthesis of AgNPs in an aqueous methanol reaction medium using hydrazino-isatin derivatives and studying their antibacterial effect. Results IsH and BIsH are remarkably powerful reductants for Ag+ ions in an aqueous methanol medium, which could be considered as a simple chemical reduction method for formation of AgNPs. The AgNP formation depends on the solubility of the hydrazino-isatin derivatives. BIsH gave more AgNPs than IsH, as observed from XRD. The formation of AgNPs is attributed to the adsorption of hydrazine derivatives and/or interparticle interaction on the surface of AgNP through electrostatic interactions between the lone pair electrons of the hydrazino group (C=N-NH 2 ) and the positive surface of AgNPs. AgNPs and BIsH showed high antimicrobial and bacterial activity. Conclusion In summary, it is shown that IsH and BIsH are remarkably powerful reductants for Ag+ ions in an aqueous methanol medium. BIsH gave more AgNPs than IsH, as observed from XRD due to better solubility of the BIsH than IsH in aqueous-methanol. The formation of AgNPs is attributed to the adsorption of hydrazine derivatives and/or interparticle interaction on the surface of AgNPs through electrostatic interactions between the lone pair electrons of the hydrazino group (C=N-NH 2 ) and the positive surface of AgNPs. The AgNps as well as BIsH ligand showed high antimicrobial and bactericidal activity.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Facile method for the synthesis of silver nanoparticles using 3-hydrazino-isatin derivatives in aqueous methanol and their antibacterial activity

El‐Faham¹,

Elzatahry²,

ALOthman³

et al. 2014

IJN

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“…There are several techniques for the removal of malachite green from wastewater, such as photocatalysis [8][9][10] , nanofibermembrane 11 , precipitation 12 , electrocoagulation, flotation, chemical oxidation, filtration, ozonation 13 ,microbial degradation, ion exchange, and adsorption [14][15][16][17][18][19] . Among those techniques, adsorption is the most promising process for the removal of dyes from wastewater.…”

mentioning

confidence: 99%

Thermodynamic and kinetic study of the intrinsic adsorption capacity of graphene oxide for malachite green removal from aqueous solution

Nuengmatcha¹,

Mahachai²,

Chanthai³

2014

Orient J Chem

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Graphene oxide (GO) was produced from bare graphite (BGP) material and was used as an intrinsic adsorbent for the removal of malachite green (MG) from aqueous solution. In an optimization study, the effects of the initial concentration of MG, solution pH, adsorbent dosage, contact time and ionic strength were investigated in detail. The water-soluble dye was analyzed at a maximum wavelength of 618 nm. The optimum conditions for MG removal from aqueous solution included a 300 mg/L initial concentration with 0.02 mg adsorbent at pH 5.1, and complete adsorption equilibrium was reached within 40 min. The maximum adsorption capacity of GO for MG was 384.62 mg/g, dramatically higher (over 10 times) than that of BGP (28.73 mg/g).The adsorption process followed pseudo-second-order kinetics. Thermodynamic data demonstrated that dye adsorption onto the GO surface was mainly an exothermic spontaneous reaction. The remarkably different adsorption isotherms for GO and BGP fit well with the Langmuir and Freundlich models, respectively. It is therefore evident that the prepared GO can be used as a highly effective adsorbent for this toxic dye.

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“…Most approaches for gold decoration of AC include physical evaporation, attachment after oxidation, and solidstate reaction with gold salt at elevated temperatures and electro-less deposition from salt solutions with the aid of reducing catalysts or agents [79]. The amount of carbon, hydrogen, nitrogen, and oxygen functional groups, with a highly porous nature of AC, may greatly inhibit Au nanoparticles on the AC surface [78,80]. A novel mild method for the preparation of AC/gold composites through the direct reduction of Au 3?…”

Section: Activated Carbon/gold (Au) Hybridmentioning

confidence: 99%

“…To acquire a high metal dispersion, gold nanoparticles were deposited on the AC solution of ethylenediamine complex [Au(en) 2 ]Cl 3 . The phenolic group could attach itself to Au 3? ions, resulting in the formation of small gold nanoparticles after the reduction of H 2 [80,81]. The chemically modified AC was obtained by the gas-phase oxidation of the latter to introduce surface O 2 groups.…”

Section: Activated Carbon/gold (Au) Hybridmentioning

confidence: 99%

Effect of hybridization on the value-added activated carbon materials

Julkapli

2016

Int J Ind Chem

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This paper provides a concise review of recent advances in activated carbon (AC) and its corresponding modified material. Topics covered in this work include the synthesis and characterization of AC as the feedstock materials, as well as the properties and applications of the subsequent hybrid material for different industries. Numerous research studies have since reported remarkable physical, chemical, thermal, conductivity, porosity, and mechanical (stiffness and strength) properties of AC in different types of multiple material matrices, including polymers, metals, and ceramics. The incorporation of AC particles into material matrices may result in the formation of an entire new class of advanced materials, due to the resulting strong interfacial bonds of the hybrid components. Although this requirement is no different from those that offer conventional hybrid materials, the scale of the reinforcement and filled phase of the AC has changed from micrometers to nanometers. This create opportunities to increase the potential applications of AC hybrid materials of the development of fundamentally unique new materials for in chemical conversion, environmental, and fuel storage applications.

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Optimization of the combined ultrasonic assisted/adsorption method for the removal of malachite green by gold nanoparticles loaded on activated carbon: Experimental design

Cited by 203 publications

References 49 publications

Facile method for the synthesis of silver nanoparticles using 3-hydrazino-isatin derivatives in aqueous methanol and their antibacterial activity

Facile method for the synthesis of silver nanoparticles using 3-hydrazino-isatin derivatives in aqueous methanol and their antibacterial activity

Thermodynamic and kinetic study of the intrinsic adsorption capacity of graphene oxide for malachite green removal from aqueous solution

Effect of hybridization on the value-added activated carbon materials

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