Adsorption studies on the removal of Malachite Green from aqueous solutions onto halloysite nanotubes

Kiani, Gholamreza; Dostali, Mohammad; Rostami, Ali; Khataee, Alireza

doi:10.1016/j.clay.2011.07.008

Cited by 39 publications

(37 citation statements)

References 35 publications

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“…Halloysite, a mineral of the kaolin group [forms hollow tubular crystals (halloysite nanotubes-HNTs)], can be used as MG dye adsorbent by Kiani et al (2011) and found that the equilibrium adsorption was reached within 30 min. The adsorption of MG by HNTs obeyed pseudo-secondorder kinetics with activation energy 18.28 kJ/mol, 49.…”

Section: Nanomaterialsmentioning

confidence: 99%

Malachite green “a cationic dye” and its removal from aqueous solution by adsorption

2016

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Adsorption can be efficiently employed for the removal of various toxic dyes from water and wastewater. In this article, the authors reviewed variety of adsorbents used by various researchers for the removal of malachite green (MG) dye from an aqueous environment. The main motto of this review article was to assemble the scattered available information of adsorbents used for the removal of MG to enlighten their wide potential. In addition to this, various optimal experimental conditions (solution pH, equilibrium contact time, amount of adsorbent and temperature) as well as adsorption isotherms, kinetics and thermodynamics data of different adsorbents towards MG were also analyzed and tabulated. Finally, it was concluded that the agricultural solid wastes and biosorbents such as biopolymers and biomass adsorbents have demonstrated outstanding adsorption capabilities for removal of MG dye.

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Section: Nanomaterialsmentioning

confidence: 99%

Malachite green “a cationic dye” and its removal from aqueous solution by adsorption

2016

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“…Discharging colored wastewater into water resources leads to detrimental effects on the environment, potential risk to human health, toxicity to flora and fauna and derogatory effects on the photosynthesis [1][2][3][4]. Therefore, the purification of colored wastewaters has become an extremely important topic [5,6].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the purification of colored wastewaters has become an extremely important topic [5,6]. Among available treatment techniques used for dye removal, such as coagulation and flocculation, membrane filtration, ozonation, and biological processes [1][2][3]5,6], the adsorption process has proven to be effective and reliable for removing dyes from aqueous solutions [7][8][9][10][11]. The adsorption process has ease of operation, cost efficiency, availability of adsorbents and no sludge formation [1][2][3]5,6,12,13].…”

Section: Introductionmentioning

confidence: 99%

Ultrasound-assisted adsorption of textile dyes using modified nanoclay: Central composite design optimization

Hassani

Soltani

Kıranşan

et al. 2015

Korean J. Chem. Eng.

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The removal of two anionic dyes, C.I. Acid Orange 7 (AO7) and C.I. Acid Red 17 (AR17), by ultrasoundassisted adsorption on the modified nanoclay in aqueous solutions was studied. The modified nanoclay was characterized by SEM/EDX, BET, XRD and FT-IR techniques. The average crystal size for the interlayer spacing of the modified nanoclay was about 14.3 nm. Central composite design (CCD) was used for the optimization of the operational parameters, including the initial dye concentration, sonication time, adsorbent dosage and temperature. The results demonstrated a good agreement between the predicted values obtained by the model and the experimental values for both AO7 (R 2 = 0.959) and AR17 (R 2 =0.971).

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“…The concentration of remaining Se ions in the water phase was determined using HR-CS GFAAS. The adsorption capacity (q t ) was calculated from the equation q t = V (C 0 − C t ) / W, where C 0 and C t are the element concentrations before and after adsorption (mg/L), V is the volume of sample solution (L), and W is the mass of adsorbent (g) (Kiani et al 2011). The adsorption capacity was found to be 11 mg/g for Se.…”

Section: Adsorption Capacitymentioning

confidence: 99%

“…Halloysite tubes are characterized by multilayer walls with a negatively charged outer surface and a positively charged inner surface at pHs between 2 and 9. This enables selective adsorption, as anions can be trapped in the lumina of tubes while cations can be immobilized on their surfaces (Kamble et al 2012;Kiani 2014;Luo et al 2010;Zhao and Liu 2008;Kiani et al 2011;Rawtani and Agrawal 2012).…”

Section: Introductionmentioning

confidence: 99%

Determination of Selenium in Food Samples by High-Resolution Continuum Source Atomic Absorption Spectrometry After Preconcentration on Halloysite Nanotubes Using Ultrasound-Assisted Dispersive Micro Solid-Phase Extraction

Krawczyk

2018

Food Anal. Methods

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In this study, a preconcentration procedure was developed for the determination of selenium in food samples using highresolution continuum source graphite furnace atomic absorption spectrometry (HR-CS GFAAS). Halloysite nanotubes (HNTs) were used as a solid sorbent in ultrasound-assisted dispersive micro solid-phase extraction (USA DMSPE) during the preconcentration step. The experimental parameters including pH of the sample solution, the amount of halloysite nanotubes, and ultrasonication time, as well as the main parameters of HR-CS GFAAS, were optimized. The limit of detection of total selenium was 0.01 μg/L and the achieved preconcentration factor was 18. The relative standard deviations (RSDs) were 6-9%. The accuracy of this method was validated by analyses of NIST SRM 1567a (wheat flour) and NIST SRM 1549 (non-fat milk powder) certified reference materials. Selenium contents measured in these reference materials were in satisfactory agreement with the certified values according to the t test for a 95% confidence level. The proposed method was successfully applied to the determination of selenium in food samples (corn flour, rice flour, oat flour, buckwheat flour, garlic, cranberries, goji berries, and raisins).

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Adsorption studies on the removal of Malachite Green from aqueous solutions onto halloysite nanotubes

Cited by 39 publications

References 35 publications

Malachite green “a cationic dye” and its removal from aqueous solution by adsorption

Malachite green “a cationic dye” and its removal from aqueous solution by adsorption

Ultrasound-assisted adsorption of textile dyes using modified nanoclay: Central composite design optimization

Determination of Selenium in Food Samples by High-Resolution Continuum Source Atomic Absorption Spectrometry After Preconcentration on Halloysite Nanotubes Using Ultrasound-Assisted Dispersive Micro Solid-Phase Extraction

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