Biosorption of heavy metals by organic carbon from spent mushroom substrates and their raw materials
International Journal of Environmental Science and Technology, ISSN: 1735-2630, Vol: 13, Issue: 11, Page: 2713-2720
2016
- 42Citations
- 68Captures
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Article Description
The use of agricultural wastes as biosorbents is gaining importance in bioremediation of heavy metal-polluted water and soils, due to their effectiveness and low cost. This work assesses the Cd, Pb and Cu adsorption capacity of the raw materials used in the production of substrates for mushroom production (Agaricus bisporus and Pleurotus ostreatus) and the spent mushroom composted (SMC), based on the functional groups of their organic carbon. The raw materials studied included agricultural wastes (wheat straw, wheat and rice poultry litter, grape pomace) and inorganic substances (gypsum and calcareous sand). Organic carbon from wastes and their composting products were characterized by CP-MAS C NMR. Langmuir adsorption isotherms of metals were plotted for each raw material, composting step, spent A. bisporus and P. ostreatus substrates and the final SMC. The maximum adsorption capacities of SMC were 40.43, 15.16 and 36.2 mg g for Cd, Pb and Cu, respectively. The composting process modified the adsorption properties of raw materials because of the enhanced adsorption of Cd and Cu and decreased adsorption capacity of Pb. CP-MAS C NMR and potentiometric titration were used to identify the functional groups of the organic carbon responsible for the metal adsorption. The content of cellulose was correlated with Pb adsorption (p < 0.001), alkyl and carboxyl carbon with Cd adsorption (p < 0.001), and N-alkyl (p < 0.001) and carboxyl (p < 0.010) groups with Cu adsorption. These results are valuable to develop new biosorbents based on agricultural wastes and demonstrate the high potential of SMC to adsorb heavy metals from polluted environments.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84991227997&origin=inward; http://dx.doi.org/10.1007/s13762-016-1100-6; http://link.springer.com/10.1007/s13762-016-1100-6; http://link.springer.com/content/pdf/10.1007/s13762-016-1100-6.pdf; http://link.springer.com/article/10.1007/s13762-016-1100-6/fulltext.html; https://dx.doi.org/10.1007/s13762-016-1100-6; https://link.springer.com/article/10.1007/s13762-016-1100-6
Springer Nature
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