Journal
DESALINATION AND WATER TREATMENT
Volume 195, Issue -, Pages 389-402Publisher
DESALINATION PUBL
DOI: 10.5004/dwt.2020.25909
Keywords
Fly ash; Pine nut shell; Bentonite; Cr(VI); Adsorption
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Funding
- Special Fund for Scientific Research by Shaanxi Provincial Education Department [18JK1199]
- Special Fund for Scientific Research by Xijing University [XJ18T01]
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Industrial waste or natural materials used as adsorbents for wastewater treatment have the advantage of cost-effective, simple operation, and high efficiency. In this work, batch tests were performed to investigate the adsorption characteristics of Cr(VI) onto fly ash, pine nut shells, and acid-modified bentonite and explore the influence of the solid-to-liquid ratio, pH, ionic strength, and reaction time on adsorption. The results show that the removal rate of the three adsorbents increases with increasing solid-to-liquid ratio, while the unit adsorption capacity decreases. The unit adsorption capacity is maximized when pH = 1-3 and decreases with increasing Cl(- )concentration. The adsorption of fly ash, pine nut shells, and acid-modified bentonite is a rapid reaction process, of which reaches equilibrium at 180, 120, and 90 min, respectively. The maximum adsorption capacities of fly ash, pine nut shells, and acid-modified bentonite is 0.57, 6.06, and 10.55 mg/g, respectively. The adsorption of Cr(VI) onto fly ash is an exothermic reaction, and the adsorption onto either pine nut shells or acid-modified bentonite is an endothermic reaction. The adsorption of Cr(VI) onto fly ash can be described using the Langmuir, Freundlich, and Redlich-Peterson models, and the pine nut shells can be described by the Langmuir and Redlich-Peterson models, whereas the acid-modified bentonite can be described by the Langmuir, Temkin, and Redlich-Peterson models. The pseudo-second-order kinetic model can accurately describe the kinetic processes of Cr(VI) adsorption onto these adsorbents.
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