Adsorption behavior and mechanism of Cr(VI) using Sakura waste from aqueous solution

The main chemical components of Sakura leaves are cellulose 16.6%, hemicellulose 10.4%, lignin 18.3%, ash 11.4%, and others 43.3%. The adsorption capacity of Cr(VI) onto Sakura leaves can achieve 435.25mgg⿿1, much higher than other similar agroforestry wastes. ⿢Sakura leaves were prepared to remove...

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Bibliographic Details
Published in:Applied surface science 2016-01, Vol.360, p.470-476
Main Authors: Qi, Wenfang, Zhao, Yingxin, Zheng, Xinyi, Ji, Min, Zhang, Zhenya
Format: Article
Language:English
Subjects:
Adsorption
Aqueous solutions
Fourier transforms
Hexavalent chromium
Infrared spectroscopy
Isotherm
Kinetic
Lead (metal)
Mechanism
Selectivity
Surface chemistry
Wastes
X-ray photoelectron spectroscopy
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Summary:The main chemical components of Sakura leaves are cellulose 16.6%, hemicellulose 10.4%, lignin 18.3%, ash 11.4%, and others 43.3%. The adsorption capacity of Cr(VI) onto Sakura leaves can achieve 435.25mgg⿿1, much higher than other similar agroforestry wastes. ⿢Sakura leaves were prepared to remove Cr(VI) from aqueous solution.⿢The maximum adsorption capacity of Cr(VI) reached 435.25mgg⿿1.⿢Cr(VI) adsorption fitted pseudo-second-order kinetic model.⿢Isotherm models indicated Cr(VI) adsorption occurred on a monolayer surface.⿢The influence order of coexisting ions followed PO43⿿>SO42⿿>Cl⿿. A forestall waste, Sakura leave, has been studied for the adsorption of Cr(VI) from aqueous solution. The materials before and after adsorption were characterized by X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR). To investigate the adsorption performance of Sakura waste, batch experiments were conducted under different adsorbent dosage, contact time, initial concentration of Cr(VI), and co-existing ions. Results showed the data fitted pseudo-second-order better than pseudo-first-order kinetic model. Equilibrium data was analyzed with Langmuir, Freundlich and Redlich⿿Peterson isotherm models at temperature ranges from 25°C to 45°C. The maximum adsorption capacity from the Langmuir model was 435.25mgg⿿1 at pH 1.0. The presence of Cl⿿, SO42⿿ and PO43⿿ would lead to an obvious negative effect on Cr(VI) adsorption, and their influence order follows PO43⿿>SO42⿿>Cl⿿. The study developed a new way to reutilize wastes and showed a great potential for resource recycling.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2015.10.088