Preparation of Fly ash/nano-ZnO Composite And Its Adsorption Properties For Reactive Dyes From Aqueous Solution

摘要

The fly ash (FA)/nano-ZnO composite was prepared by chemical precipitation method using waste FA, ZnSO_4 and (NH_4)_2CO_3 as raw materials and further analyzed by specific surface area and XRD. Effects of important preparation conditions on the dye adsorption capacity of the composite were investigated. The results show that the FA/nano-ZnO composite obtained under optimal conditions of FA/ZnO mass ratio of 1:0.5, reaction and standing 2h at 60°C and calcining time of 3h at 250°C is a high efficient adsorbent and has much more higher adsorption capacities on 4 kinds of reactive dyes, reactive turquoise blue KN-G, reactive brilliant blue KN-R, reactive brilliant red X-3B and reactive brilliant red KD-8B from aqueous solution with 61.64mg/g, 46.36mg/g, 43.27mg/g and 31.18mg/g which are increased about 14, 32, 33 and 32 times than that of FA, respectively.