The Research On Adsorption Of Copper And Lead Ions From Aqueous Solution By Manganese Oxide Coated Filter Media

In recent years, several techniques have been developed for coating iron, aluminum and manganese oxides or hydroxide onto the surface of filter media to overcome the problem of separation of metal oxides powder after water treatment. These coated filter media have been used as new environmental materials. Coating of oxide can improve the surface characters of the original filter media, and enhance the ability of removing contaminants such as heavy metal ions in polluted water. The research described here was designed to test the properties of manganese oxide, manganese oxide coated quartz sand (MOCS) and manganese oxide coated zeolite (MOCZ) for removing copper and lead ions from synthetic solutions. The adsorptive mechanisms of Cu2+ and Pb2+ by manganese oxide, MOCS and MOCZ were also investigated.Oxidation-reduction reaction was used to prepared manganese oxide. Quartz sand and zeolite were employed as carriers, as well as manganese oxide was employed as modifiers, two kinds of coated filters media MOCS and MOCZ were prepared. Specific surface area, surface morphologies and matter species of manganese oxide, MOCS and MOCS were measured and analyzed, respectively. Manganese content, binding ability of manganese oxide layer on quartz sand and zeolite substrates and stability of MOCS and MOCZ were also investigated. From these researchs, we found that the adsorbents of MOCS and MOCZ have large surface areas, high mechanical strength and high physical-chemical endurance.The properties of manganese oxide as an adsorbent for removing copper and lead ions from synthetic solutions were investigated in a batch system. The comprehensive studies on the adsorption of MOCS and MOCZ were conducted in static and mobile adsorption methods. The influential factors, such as adsorbents dose, pH values, salt concentration, contact time, temperature and coexisting metal ions etc. were studied. The mechanism, thermodynamics and kinetics of adsorptive process were investigated also. Binding of Cu2+ and Pb2+ ions onto adsorbents was highly pH dependent. After adsorption process is over, the pH in solution was lower than the initial pH. It clearly indicated there had an exchange reaction of Cu2+ or Pb2+ with H+ on the surface. Higher removing ability for Cu2+ and Pb2+ were observed when temperature increased. The maximum adsorption quantities of Cu2+ per gram manganese oxide, MOCS and...