▎ 摘　　要

This study deals with the removal of Pb(II) ion from the aqueous solution using graphene oxide decorated by MgO nanocubes (GOMO) as an adsorbent. The nanohybrid was prepared by simple precipitation method and characterized by FTIR, XPS, XRD SEM and EDX analysis. A continuous up flow fixed -bed column study was performed utilizing the GOMO nanohybrid for field applicability by varying the column parameter such as bed height, flow rate and initial metal ion concentration. The maximum adsorption capacity of the GOMO nanohybrid was 187.9 mg/g at an initial lead concentration of 80 mg/L, bed height of 7.5 cm, and flow rate of 1.66 mL/min at pH 6.5. The breakthrough curves obtained were analyzed with different models i.e. Bed Depth Service Time (BDST), Thomas and Yoon-Nelson. The high R-2 values obtained for the BDST model revealed its applicability for this system. Desorption of Pb2+ ions on GOMO was performed with 0.1 M HC1 solution, and the adsorbent found to retain its high adsorption up to three cycles. Life factor calculation indicated that adsorbent bed would have sufficient capacity to avoid breakthrough at time t = 0 up to 6.7 cycles and the bed would be completely exhausted after 17.3 cycles. (C) 2017 Elsevier Ltd. All rights reserved.