Removal of Molybdate Anions from Water by Adsorption on Zeolite‐Supported Magnetite

• DOI: 10.2175/106143012x13373550427318
• Publication Date: 2012-09-15T05:19:26Z
• Authors: Bram Verbinnen; Chantal Block; Dries Hannes; Patrick Lievens; Miroslava Vaclavi...; Katarina Stefusova; Georgios Gallios; Carlo Vandecasteele
• Keywords: Clinoptilolite; Ammonium molybdate

Industrial wastewater may contain high molybdenum concentrations, making treatment before discharge necessary. In this paper, the removal of molybdate anions from water is presented, using clinoptilolite zeolite coated with magnetite nanoparticles. batch experiments influence pH, ionic strength, possible interfering (oxy)anions, temperature and contact time investigated. Besides determination kinetic parameters adsorption isotherms, thermodynamic modeling performed to get better insight into mechanism; assumed be adsorbed as a FeOMoO 2 (OH).2H O inner‐sphere complex. At optimum pH 3, capacity around 18 mg per gram adsorbent. The strength solution has no on capacity. Other anions, added in at least tenfold excess, only have minor molybdenum, exception phosphate. Adsorption increases when increased. It demonstrated that adsorbent can used remove industrial streams, limitations set by World Health Organization (residual concentration 70 μg/l Mo) easily met.