The Application Of Metal Complexes Coordinated By H₃BTC And Its Derivatives In Decolorization Of The Wastewater Containing Dye Stuffs

Dye wastewater is a huge amount of trade waste water discharged. The rapid and efficientmethods to dye wastewater treatment have important practical values. Compared to many othercommonly used treatment methods, enzymatic degradation of dye are more environment-friendly.Some metal complexes that have specific structures have potential enzymatic properties, but morestable than the enzyme, easier to save. So the design and synthesis of metal complexes to simulatelaccase and some metal oxidase to catalyze and oxidize the degradation of dyes. To solve thedye-containing wastewater treatment provides a new technology.In the first part of this study, by hydrothermal method, four metal complexes were preparedby reactions of H3BTC and H3BTB ligands with metal Co and Mn salts. The chemical structuresof the metal complexes were characterized and analyzed by IR, EA, ICP.In the second part of this study, The metal complexes were applied to catalyze hydrogenperoxide decolorizing Reactive Brilliant Blue KN-R. The decolourization ratios in differentconditions were studied in detail, such as the concentration of hydrogen peroxide and catalyst,temperature and dye initial concentration. And we conducted a cycle of use. The results showedthat the four metal complexes all had good catalytic activity at room temperature. Co-L1, Co-L2,Mn-L2in the hydrogen peroxide concentration is5mmol/L can decolorize dye efficiently. Mn-L1decolorize dye efficiently require hydrogen peroxide concentration of10mmol/L. Co-L1, Mn-L1achieve decolorization equilibrium time is shorter than Co-L2, Mn-L2. Achieving decolorizationequilibrium time of Mn-L1is1.5h.These four complexes as heterogeneous catalysts, after the end of the experiment, still can be recycled. Although decolorization rate increases as the number of cycles constantly decreasing,but the third time in four complexes using decolorization rate was still able to reach more than70%.In brief, such a dye wastewater treatment, either from decolorization, or saving resources,both can have broad application prospects.