Alkaline pre-treatment of waste chestnut shell from a food industry to enhance cadmium, copper, lead and zinc ions removal

Vázquez, G.; Mosquera, Olga; Freire, M. Sonia; Antorrena, G.; González‐Álvarez, Julia

doi:10.1016/j.cej.2012.01.019

Cited by 74 publications

(17 citation statements)

References 18 publications

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“…The chestnut husk spectrum shows absorption bands at around 3400 cm −1 and 2900 cm −1 related to O-H and C-H vibrations, respectively. The peaks at 1750 cm −1 are accounted for the C=O band in carbonyl groups, whereas the peaks between 1050 and 1350 cm −1 correspond to the C-O band found in ester, phenol, and ethers which are active groups of their constituent compounds (lignin, tannins, cellulose and hemicelluloses) [25,26]. The spectra of pure starch samples show a broad peak at 3200 cm −1 that is attributed to O-H stretching due to the presence of hydroxyl groups in the starch molecules [27][28][29].…”

Section: Results and Conclusionmentioning

confidence: 99%

Preparation and characterization of a novel starch–chestnut husk biocomposite

et al. 2019

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Biocomposites based on potato starch and reinforced with chestnut husks, a lignocellulosic agroforestry waste, were developed by incorporating 2.5 wt%, 5 wt% and 7.5 wt% of chestnut husks via an extrusion molding procedure. The effect of the filler on the morphology and thermos-mechanical properties were studied by scanning electron microscopy (SEM), infrared spectroscopy (FTIR) and dynamic mechanical analysis (DMA). Chestnut husks were homogeneously dispersed within the plasticized starch matrix as shown by SEM images. FTIR results shows that the peaks of pure starch samples in the 500-1500 cm −1 region vanished as chestnut husks was incorporated, suggesting an interaction between starch and chestnut. The glass transition temperature was found to decrease at higher filler content, which indicates an improvement in segmental mobility of starch molecules. DMA tests revealed the presence of two relaxation processes. The α relaxation was associated with the cooperative segmental motion of starch chains while the β relaxation was assigned to the segmental mobility of glycerol-rich phases.

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Section: Results and Conclusionmentioning

confidence: 99%

Preparation and characterization of a novel starch–chestnut husk biocomposite

et al. 2019

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“…The maximum adsorption capacity (q mLF ) and affinity parameter (b LF ) obtained to the Langmuir-Freundlich model were equal 18.52 mg•g -1 and 0.037 l•mg -1 . Vázquez et al 57 investigated the potential of chestnut shell waste in Zn 2+ removal from aqueous solutions. In this study the Langmuir-Freundlich also isotherm fitted better Zn 2+ experimental data, with q mLF equal 8.88 mg•g -1 .…”

Section: Adsorption Isothermsmentioning

confidence: 99%

Fe3O4@C core-shell nanoparticles as adsorbent of ionic zinc: evaluating of the adsorptive capacity

et al. 2019

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Zinc is an important chemical element in many metabolic mechanisms at low concentrations, but can be toxic when administrated in doses higher than 500 µg•g-1 or 3 mg•L-1. This metal has been detected in many aquatic environments due to several industry activities and swine manure effluents. Thus, the contaminant removal of water and wastewater has been a major challenge. Many processes are applied and evaluated in an attempt to removal zinc found in environment, such as adsorption. In the present study Fe 3 O 4 @C core-shell nanoparticles were synthesized and used to adsorb ionic zinc species in aqueous solutions. The core-shell nanoparticles exhibited excellent zinc removal capacity, with a maximum efficiency equal 65% where applied in an aqueous solution containing 10 mg•l-1 of this ionic metal.

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“…FT-IR spectra comparison demonstrated that although the bands of C=O and -OH in the acid-treated shell were much higher than those in the alkali-treated shell, the main functional groups found in the natural shell remained practically unchanged after the pre-treatment. Moreover, the presence of carboxyl and hydroxyl groups showed potential as proton donors to be used in coordination with cations (Iqbal et al 2009;Vázquez et al 2012), which provide a possibility for this material to be used as a biosorbent to adsorb heavy metals.…”

Section: Ft-ir Spectramentioning

confidence: 99%

Effects of Different Solvents on the Surface Acidic Oxygen-containing Functional Groups on Xanthoceras sorbifolia Shell

et al. 2014

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This study reports the preparation of a novel biomaterial from a forestry residue-Xanthoceras sorbifolia shell (XSS)-by solvent modification. The effects of acid and base (hydrochloric acerbic, acetic acid, sodium hydroxide, ammonia water) and some organic solvents (ethanol, acetone, ethyl acetate, chloroform, petroleum ether, and n-hexane) on the surface acidic functional groups (SAFGs) on XSS were investigated. The amount of SAFGs was quantified using acid and alkali chemical titration methods, and the characteristics of virgin XSS were compared with treated ones by FT-IR spectroscopy. It was found that acid solutions can increase the concentration of SAFGs, while alkaline solutions reduce it. The XSS treated in 0.5 M HCl has the largest number of total acidic functional groups and phenolic hydroxyl groups. The shell extracted with 2 M acetic acid has the highest concentration of carboxyl. The SAFG contents were remarkably increased by treatments with ethanol and acetone, due to the outstanding enhancement of phenolic hydroxyl. These changes in the SAFGs of XSS brought about by treatments with various solutions could be a theoretical foundation for modifying this residue to create a new type of highly efficient absorbent material.

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Alkaline pre-treatment of waste chestnut shell from a food industry to enhance cadmium, copper, lead and zinc ions removal

Cited by 74 publications

References 18 publications

Preparation and characterization of a novel starch–chestnut husk biocomposite

Preparation and characterization of a novel starch–chestnut husk biocomposite

Fe3O4@C core-shell nanoparticles as adsorbent of ionic zinc: evaluating of the adsorptive capacity

Effects of Different Solvents on the Surface Acidic Oxygen-containing Functional Groups on Xanthoceras sorbifolia Shell

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