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Received November 9, 2013
Accepted July 22, 2014
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Biosorption mechanism of Zn2+ from aqueous solution by spent substrates of pleurotus ostreatus

College of Resources and Environment, Northeast Agricultural University, Harbin 150030, China 1State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China
juanjuan4050234@163.com
Korean Journal of Chemical Engineering, November 2014, 31(11), 1911-1918(8)
https://doi.org/10.1007/s11814-014-0206-0
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Abstract

To solve the problem of heavy metal pollution and agricultural wastes reclamation, spent substrate of pleurotus ostreatus (SSPO) was used as adsorbent to remove Zn2+ from aqueous solution. The biosorption of zinc ions on SSPO was studied as a function of the solution pH, temperature and initial Zn2+ concentration. The equilibrium sorption data were well represented by linear Langmuir isotherm models with R2 value of 0.9955 and non-linear Freundlich with_x000D_ R2 value of 0.9973. The BET surface area of SSPO can reach 51.16m2g-1. SEM-EDX and XRD revealed that (NH4)2Zn·H2O and Zn2PO4(OH) were the main compounds in metal-loaded SSPO. FTIR analysis indicated the governing functional groups such as O-H, N-H and P=O played an important role in biosorption. The desorption studies showed the reversibility of SSPO. The results indicate that SSPO is a potential adsorbent in wastewater treatment due to its great_x000D_ sorption capacity and low cost.

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