Removal of heavy metal and sulfate ions by cellulose derivative-based biosorbents
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A series of environmentally-friendly bagasse pith cellulose-based adsorbents were prepared in an attempt to retain Cu2+ and SO42− from aqueous solutions. The proof of ion adsorption on the biosorbents was identified from Fourier transform infrared spectroscopy and energy-dispersive X-ray spectroscopy-scanning electron microscope. The adsorption capacities were highly dependent on pH and the maximum uptakes of both ions were obtained at pH 5. An increase of solution temperature resulted in decreasing Cu2+ removal but enhancing SO42− adsorption. The kinetic studies showed that the adsorptions of copper and sulfate ions followed the pseudo-second-order kinetics. The analysis of isotherm data indicated that the Langmuir and Freundlich models were in good agreement with the sorptions of Cu2+ and SO42−, respectively. The proportion of carboxylate cellulose and quaternary ammonium-functionalized cellulose in biosorbents influenced on adsorption capacity of the above ions. The adsorption mechanism was mainly governed by ion exchange, complexation and electrostatic association.
KeywordsCellulose biosorbents Carboxylate cellulose Quaternary ammonium functionalization Bagasse pith Heavy metal and sulfate ions Adsorption mechanism
The work was financially supported by National Natural Science Foundations of China (51363013), Science Research Foundation Project of Yunnan Municipal Education Commission (2016zzx045) and KMUST Scientific Research Foundation for the Introduction of Talent (KKSY201605058).
- Freundlich HMF (1906) Uber die adsorption in losungen. Z Phys Chem Leipz 57:385–470Google Scholar
- Gao X, Chen KL, Zhang H et al (2014) Isolation and characterization of cellulose obtained from bagasse pith by oxygen-containing agents. BioResources 9:4094–4107Google Scholar
- Hubbe MA, Hasan SH, Ducoste JJ (2011) Cellulosic substrates for removal of pollutants from aqueous systems: a review. 1. Metals. Bioresources 6:2161–2287Google Scholar
- Temkin MI, Pyzhev V (1940) Kinetics of ammonia synthesis on promoted iron catalyst. Acta Physochim URSS 12:327–356Google Scholar
- Weber WJ, Morris JC (1963) Kinetics of adsorption on carbon from solution. J Sanit Eng Div 89:31–60Google Scholar