摘要：Removal of heavy metals from mine tailing effluent has been a long-standing environmental managementissue in mining industry. In this study, removal of Mo(VI) from aqueous solutions was investigated usingpyrite and cinder. Various parameters such as pH, agitation time and Mo(VI) concentration have been studiedin batch experiments for the two materials firstly. The maximum adsorption of Mo(VI) occurred at pH 4.0 forcinder, and 3.0 for pyrite. Kinetic studies showed that Mo(VI) adsorption by the two materials generallyobeyed a pseudo second-order model. Furthermore, application of Langmuir and Freundlich isotherm modelsto the adsorption equilibrium data showed that the adsorption behavior obeyed the Langmuir model. Theadsorption capacity of cinder and pyrite was found to be 3.01 and 8.35 mg Mo(VI)/g adsorbent. Subsequently,three flow-through columns (Column 1#, V pyrite : V cinder = 2:1; Column 2#, V pyrite : V cinder = 1:1; Column 3#, V pyrite: V cinder = 1:2) were operated for the removal of Mo(VI) for six months. Results indicated the average removalefficiency of Mo(VI) by Column 1# were 47.68%, by Column 2# were 50.03%, and by Column 3# were23.34%, respectively. Therefore, the pyrite-cinder mixture (V pyrite : V cinder = 1:1) proven to be a feasible andcost-efficient treatment technology for Mo(VI) removal.
