Abstract: Active MgO roasted by magnesite was employed as an adsorbent to explore its capacity and cycle performance of removing Cr6+ from solution. The influences of active MgO dosage，temperature and initial pH on the treatment effect were investigated.Results showed that active magnesium oxide had a better adsorption capacity for Cr6+.The percent removal of Cr6+ increased to 99.5% with increasing the dose of active MgO to some extent.Raising the temperature could not promote the adsorption reaction actively.The pH usually under a neutral condition，the adsorption reaction could achieve an ideal effect.Adsorption capacity of active MgO was not reduced after many cycles as a recyclable material.

Key words: active MgO, Cr6+, regeneration, wastewater treatment