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Anomalocardia brasiliana shellfish shells as a novel and ecofriendly adsorbent of Nylosan Brilliant Blue acid dye.
- Source :
-
Water science and technology : a journal of the International Association on Water Pollution Research [Water Sci Technol] 2018 Nov; Vol. 78 (7), pp. 1576-1586. - Publication Year :
- 2018
-
Abstract
- Malacoculture waste (Anomalocardia brasiliana) shellfish shells (ABSS) were evaluated as adsorbents of Nylosan Brilliant Blue (NBB) acid dye. The ABSS were thermally activated at 1,000 °C for 10 h and then characterized by Fourier-transform infrared spectroscopy, analysis of specific surface area (BET), X-ray diffraction (XRD), and scanning electron microscopy. Point of zero charge (PZC) analysis of ABSS verified pH <subscript>PZC</subscript> 13.0. The study of kinetics showed that the pseudo-second-order model fit the experimental data best and the system reached equilibrium within 5 min. Adsorption isotherms followed the Langmuir-Freundlich isotherm and ABSS reached an outstanding maximum adsorption capacity of 405 mg·g <superscript>-1</superscript> under the following optimum conditions: pH 12.4, 303 K, 450 rpm, 2.0 g of adsorbent, and 150 μm average particle size. These conditions were obtained after a previous statistical analysis of the variables. Enthalpy and Gibbs energy obtained in the thermodynamics experiments were -23.79 kJ·mol <superscript>-1</superscript> and -4.07 kJ·mol <superscript>-1</superscript> , respectively. These parameters confirm that the process is exothermic, spontaneous, and indicative of the physical nature of the adsorption. The adsorption of NBB onto ABSS tended to be more favorable at a lower temperature. Low value of enthalpy suggested that weak binding forces, such as electrostatic interactions, govern the sorption mechanism. ABSS high availability in the environment, its low toxicity and high efficiency make it a promising ecofriendly adsorbent of textile dyes.
- Subjects :
- Adsorption
Animals
Benzenesulfonates analysis
Coloring Agents
Hydrogen-Ion Concentration
Kinetics
Shellfish
Spectroscopy, Fourier Transform Infrared
Thermodynamics
Water Pollutants, Chemical analysis
Animal Shells chemistry
Benzenesulfonates chemistry
Waste Disposal, Fluid methods
Water Pollutants, Chemical chemistry
Subjects
Details
- Language :
- English
- ISSN :
- 0273-1223
- Volume :
- 78
- Issue :
- 7
- Database :
- MEDLINE
- Journal :
- Water science and technology : a journal of the International Association on Water Pollution Research
- Publication Type :
- Academic Journal
- Accession number :
- 30427798
- Full Text :
- https://doi.org/10.2166/wst.2018.434