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Biosorption mechanism of Zn from aqueous solution by spent substrates of pleurotus ostreatus
XiaoJing Hu,JuanJuan Qu,LiLong Yan,Haidong Gu,TingTing Zang,Yu Jin 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.11
To solve the problem of heavy metal pollution and agricultural wastes reclamation, spent substrate of pleurotusostreatus (SSPO) was used as adsorbent to remove Zn2+from aqueous solution. The biosorption of zinc ions on SSPOwas studied as a function of the solution pH, temperature and initial Zn2+concentration. The equilibrium sorption datawere well represented by linear Langmuir isotherm models with R2value of 0.9955 and non-linear Freundlich withR2value of 0.9973. The BET surface area of SSPO can reach 51.16 m2g−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 func-tional groups such as O-H, N-H and P=O played an important role in biosorption. The desorption studies showed thereversibility of SSPO. The results indicate that SSPO is a potential adsorbent in wastewater treatment due to its greatsorption capacity and low cost.