Building Of Micrspheres By Modified Brown Algae Laminaria Japonica And Studying The Separation Of Molybdenum And Rhenium

In this thesis, Laminaria japonica was used as raw materials to prepare differentcharacteristics of adsorbents. The different chemical modification methods were usedaccording to the main composition （active ingredient: algin and amino acid） inLaminaria japonica. Thus, three types of biomass adsorbent were prepared. At thesame time, the adsorption behaviors of the adsorbents towards molybdenum andrhenium were investigated systematically, such as the adsorption mechanisms、theadsorption properties of thermodynamics and kinetics, which provided abundantfundamental data for the application of biomass-based adsorbents in industry. And thespecified studies were as follows:First of all, Laminaria japonica was modified by potassium permanganate、dimethylamine and epichlorohydrin, which named CAP、CAD and CAE respectively.CAP、CAD、CAE characterized by infrared、PZC、boehm titration method、SEMand BET to analyse surface functional groups and morphology. The three kinds ofadsorbent had high adsorption capacity towards Mo（VI）（68.78、61.17、82.93mg/grespectively） while the adsorption of Re（VII） appeared rarely. The adsorption processfitted Langmuir isotherm model. Additionally, it was the endothermic adsorptionprocess followed pseudo-second order kinetics.Secondly, Laminaria japonica was modified by gultaraldehyde and concentratedsulfuric acid which plays a role of condensation. The two kinds of adsorbents namedCAG and CAS characterized by infrared、PZC、boehm titration method and elementalanalysis. SEM and BET showed morphology and specific surface area of CAG andCAS. The adsorption process of CAG and CAS were conducted by pH、adsorbateconcentration、thermodynamics and dynamics. CAG showed a high selectivitytowards molybdenum under the high acidity. The adsorption capacity of CAS ishigher than some reports toward because of the amino acids in Laminaria japonica inthe modification process. All of the adsorption process fitted Langmuir isothermmodel. Additionally, its excellent adsorption characteristics for the separation of Mo （VI） and Re （VII） were confirmed by the adsorption and elution tests using a columnpacked with both gel.Thirdly, the magnetic biosorbent LJS-Fe was preparaed by cladding magneticFe₃O₄with algin which collect in Laminaria japonica. The separation is easy betweenadsorbent and adsorbate because excellent magnetic properties. LJS-Fe had a highselectivity towards molybdenum with a remarkable adsorption amount （158.9mg/g）and had small infterference among other coexisting metal ions. The adsorptionprocess followed pseudo-second order kinetics was found to be the endothermicadsorption process. The recovery rate was over95%eluting by ammoniumthiocyanate and all this provided a fundamental research data for the industrialutilization of LJS-Fe in the long run.