Sorption of heavy metal ions from aqueous solution using acid-treated avocado kernel seeds and its FTIR spectroscopy characterization

Díaz-Muñoz, Lizbeth Liliana; Bonilla-Petriciolet, Adrián; Reynel-Ávila, Hilda Elizabeth; Mendoza-Castillo, Didilia I.

doi:10.1016/j.molliq.2016.01.022

Cited by 43 publications

(11 citation statements)

References 33 publications

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“…The presence of alcohols and carbonyl groups was confirmed by the bond vibrations observed at 1633 cm À1 . This confirms that avocado seed is composed of carboxylic group which is responsible for adsorption; similar results were reported in the literature [21,22].…”

Section: Characterization Of the Raw Avocado Seed And Activated Carbosupporting

confidence: 92%

Bio-adsorbents for the Removal of Heavy Metals from Water

Mqehe-Nedzivhe¹,

Makhado²,

Olorundare³

et al. 2018

Arsenic - Analytical and Toxicological Studies

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The work represents the bio-adsorption of arsenic(III) from standard solutions and real water samples using a powdered avocado seed as a bio-adsorbent. The adsorbent was synthesized, demineralized, and characterized by X-ray diffraction (XRD), scanning electron microscope coupled with energy dispersive spectroscopy (SEM-EDS), Fourier transformation infrared spectroscopy (FTIR), and Brunauer-Emmett-Teller (BET) theory. Batch adsorption studies were carried out by using avocado seed, and As III was analyzed by using inductively coupled plasma optical emission spectroscopy (ICPOES) after optimizing the following parameters: pH 6, analyte concentration 2 mg L À1 , bio-adsorbent dosage 0.8 g, contact time 120 min between analyte and adsorbent, and temperature from 22 to 40 C. The adsorption capacity of 93.75 mg/g was obtained, and the Langmuir isotherm was adopted by the adsorbent due to the chemisorption that occurs on the surface between the functional groups of the bio-adsorbent and As III .

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Section: Characterization Of the Raw Avocado Seed And Activated Carbosupporting

confidence: 92%

Bio-adsorbents for the Removal of Heavy Metals from Water

Mqehe-Nedzivhe¹,

Makhado²,

Olorundare³

et al. 2018

Arsenic - Analytical and Toxicological Studies

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“…Cellulose, hemicellulose, and lignin are the main constituents of corncob. They contain functional groups that exhibit common absorption bands, including the OH stretching at 3428 cm -1 [ 60 ] and the symmetric stretching of aliphatic chains (-CH) at 2916 cm -1 [ 61 ]. Absorption bands related mainly to cellulose were observed at 1374, 1160, and 900 cm -1 , which are associated with the symmetric C-H deformations, C-O-C stretching of glycosidic bonds, and antisymmetric out-of-plane ring stretching, respectively [ 66 , 67 , 70 ].…”

Section: Resultsmentioning

confidence: 99%

Corncob as an effective, eco-friendly, and economic biosorbent for removing the azo dye Direct Yellow 27 from aqueous solutions

et al. 2018

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The corncob is an agricultural waste generated in huge quantities during corn processing. In this paper, we tested the capacity of corncob particles for water purification by removing the azo dye Direct Yellow 27 (DY27) via biosorption. The biosorption process was investigated in terms of the kinetics, equilibria, and thermodynamics. Batch biosorption studies showed that the biosorption performance has strong inverse correlations to the solution pH and the corncob particle size, and it increases quickly with increasing contact time and initial dye concentration. The pseudo-second-order kinetic model provides the best fit to the experimental data, whereas the Redlich-Peterson isotherm model is most suitable for describing the observed equilibrium biosorption. The biosorption process is exothermic, spontaneous, and physisorption in character. Fourier transform infrared (FTIR) spectroscopy and confocal scanning laser microscopy (CSLM) studies suggest that lignocellulose and proteins play key roles in the biosorption of DY27 from aqueous solutions by corncob. Furthermore, after biosorption onto the corncob, the dye can be effectively desorbed using 0.1 M NaOH solution. Therefore, the corncob can be used as a promising biosorbent to remediate DY27-contaminated water and wastewater.

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“…The presence of an absorption band at 1732 cm -1 (ν C=O) is characteristic of a saturated aliphatic ester (Silverstein, 2000). This band is associated with the C-C-(C=O)-O absorption of ester in the 1300 and 1167 cm -1 regions (Díaz-Muñoz, et al 2016). These characteristics confirm the presence of the saturated ester, methyl dodecanoate, which is the principal component in macaúba methyl biodiesel.…”

Section: Infrared Spectroscopymentioning

confidence: 95%

Study of storage condition on the physicochemical properties of biodiesel derived from macaúba palm (Acrocomia aculeata) oil using multivariate analysis

Arrudas¹,

Fidêncio²,

Silvério³

et al. 2018

Aust J Crop Sci

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The influence of storage conditions on the properties of biodiesel from macaúba (Acrocomia aculeata (Jacq.) Lodd. ex Mart). seed oil was evaluated. The biodiesel samples were stored for 12 months at 25 °C and 4 °C. The physical properties of the biodiesel: acidity index, peroxide and refractive index, flash point, and oxidative stability were determined. The chemical composition of the biodiesel was determined by gas chromatography coupled to mass spectrometry and by infrared spectroscopy. The analysis of the main components and the Hierarchical Analysis were used to group the samples. The oxidative stability of biodiesel, which developed low acid and peroxide indexes, and the ester composition were maintained stable, regardless of the storage method. However, storage at 4 °C proved to be more efficient in maintaining the characteristics of the biodiesel. The high quality of biodiesel and its stability confirm the potential of the agro-industrial use of biodiesel from Acrocomia aculeata.

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Sorption of heavy metal ions from aqueous solution using acid-treated avocado kernel seeds and its FTIR spectroscopy characterization

Cited by 43 publications

References 33 publications

Bio-adsorbents for the Removal of Heavy Metals from Water

Bio-adsorbents for the Removal of Heavy Metals from Water

Corncob as an effective, eco-friendly, and economic biosorbent for removing the azo dye Direct Yellow 27 from aqueous solutions

Study of storage condition on the physicochemical properties of biodiesel derived from macaúba palm (Acrocomia aculeata) oil using multivariate analysis

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