ARSENIC REMOVAL KINETICS OF IRON OXIDE-COATED FD3ERGLASS FD3ERS

摘要

This paper presents the arsenic removal effectiveness of iron oxide-coated fibers. Iron oxide-coated fiberglass fibers, coated at 0.25M initial iron, pH 1.3, and 110°C, offered faster arsenate removal (50% removal time, t_(0.5) = 0.13 h) than other iron oxide-based arsenic adsorbents, such as iron oxide impregnated sand, granular ferric hydroxide, ion exchange resin, and bead cellulose filled with iron oxyhydroxide (t_(0.5) = 0.25 h - 3.88 h). However, the arsenate adsorption kinetics of these fibers were found to be slower than that of the hybrid (polymer/inorganic) and ion exchange fibers (t_(0.5) = 0.006 h - 0.037 h). Arsenate adsorption kinetics of these coated fibers was best described by the Elovich equation, followed by the pseudo-second order kinetic model. Arsenate mass transfer on coated fiberglass fibers appears to be limited by external mass transfer resistance during the first 0.2 h and by intraparticle mass transfer, thereafter. Further work is warranted to provide a more uniform and durable iron oxide coating.