Adsorption Characteristics of Pb2+ onto Wine Lees-Derived Biochar
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Biochar has great advantages in soil amendment and polluted soil remediation. Herein, the pore and adsorption properties of wine lees-derived biochar were explored. Specifically, the adsorption isotherm and kinetics of Pb2+ onto wine lees-derived biochar were examined. Experimental results revealed that wine lees-derived biochar featured large specific surface area and total pore volume, and high contents of –COOH and –OH on its surface. Adsorption of Pb2+ onto wine lees-derived biochar proceeded via a multilayer adsorption mechanism, as described by the Freundlich adsorption model. Adsorption kinetics followed the Lagergren pseudo-second-order kinetics model; adsorption equilibrium was achieved within 30–60 min. Furthermore, the effect of solution pH on the adsorption of Pb2+ was investigated. Within the studied pH range of 3–6, the adsorption capacity increased with increasing pH. Under established optimized conditions, wine lees-derived biochar achieved a Pb2+ adsorption capacity of 79.12 mg/g.
KeywordsBiochar Pb2+ Adsorption Kinetics
This research was supported by the Provincial Science and Technology Support Program of Sichuan (2015SZ0007), the National Natural Science Foundation of China (21307085), Natural Science Foundation of Chongqing (cstc2015jcyjA1574), Natural Science Foundation of Yongchuan (Ycstc, 2015nc1002) and Natural Science Foundation of Arts and Sciences of Chongqing University (Y2015CH31).
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