Journal
JOURNAL OF POLYMERS AND THE ENVIRONMENT
Volume 30, Issue 10, Pages 4304-4319Publisher
SPRINGER
DOI: 10.1007/s10924-022-02513-2
Keywords
Starch nanocrystals (SNCs); Preparation; Adsorption; Metal ion
Categories
Funding
- Hunan Provincial Natural Science Foundation of China [2020JJ4095]
- Hunan Provincial Science Fund for Distinguished Young Scholars [2021JJ10007]
- Research and Development Program in Key Areas of Hunan Province [2021NK2015, 2019SK2121]
- Hunan Scientific Talents Promotion Program
- Hunan Association for Science and Technology [2019TJ-Q01]
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In this study, starch nanocrystals (SNCs) were prepared using enzymatic pre-hydrolysis combined with sulfuric acid hydrolysis and their adsorption capacity for heavy metal ions in an aqueous solution was investigated. The results showed that SNCs had high adsorption capacity for Zn(II), Cu(II), and Fe(II) and followed the second-order kinetics and the Freundlich adsorption isotherm.
In this paper, the starch nanocrystals (SNCs) were prepared by enzymatic pre-hydrolysis combined with sulfuric acid hydrolysis and used to remove the heavy metal ions by adsorption. The optimum preparation conditions were determined according to the enzymatic hydrolysis kinetics, XRD, and particle size analysis results. The adsorption capacity of SNCs for Zn(II), Cu(II), and Fe(II) in an aqueous solution was studied by changing the pH, contact time, and initial concentration of metal ions using the batch equilibrium technique. When the initial concentration of metal ions was 200 mg/L, the maximum adsorption capacity of SNCs for Zn(II), Cu(II), and Fe(II) was 46.13 mg/g, 35.83 mg/g and 17.49 mg/g, respectively. The results also showed that the adsorption of Zn(II), Cu(II), and Fe(II) by SNCs conformed to the second-order kinetics and the Freundlich adsorption isotherm.
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