| Organic contaminants are the uppermost pollutants in environments; of that the kind of persistent organic pollutants (POPs) poses the largest harm due to they are difficult to be disposed. Being mostly polycyclic aromatic hydrocarbons, POPs have wide distribution, long-time existence and difficult disposal in water, thus arising considerable interests by scientists in many countries.Fenton hydrocarbonylation, being a senior oxidation technique, brings about hydroxyl free radical(·OH) which is efficacious to deCrade organic compounds, even to completely transforming organic compounds into harmless inorganic substances. In this paper, microwave is introduced into Fenton reaction system, aiming to improving deCradation of polycyclic aromatic hydrocarbon organics—malachite Creen and rhodamine B. the following contents are included: investigations on microwave-Fenton synergistic effects; deriving the optimum experimental condition from orthogonal experimental design based on single-factor experiment; via controlling experiment, kinetic equation for microwave-Fenton oxidizing reaction to deCrade target organics is obtained. Meanwhile, taking the place of ion Fe(Ⅱ), ion Cr(Ⅵ)is utilized as catalytic agent to implement above-mentioned experiments to deCrade target organics.By experiments, it is suggested that the couple of microwave-Fenton possess of synergistic effects which enable quick deCradation velocity of malachite Creen; for the malachite Creen solution with the concentration of 100mg/L, the optimum experimental condition is resulted; pH=3.4, 1.00ml30%H2O2, 4.00ml 0.020mol L-1Fe(Ⅱ) and 8min microwave interactions. Then, 99.0% of malachite Creen is removed and 89.7% for COD. On original condition that pH=3.4, kinetic equation for Fenton reaction in case of microwave radiation to deCrade malachite Creen is as: V=0.033716×[Malachite Creen]0.986×[Fe2+]0.8234×[H2O2]0.1663.Combination of microwave and Fenton-like agents possess of synergistic effects which enable quick deCradation velocity of malachite Creen; for the malachite Creen solution with the concentration of 100mg/L, the optimum experimental condition is as these: pH=3.2, 1.00ml30%H2O2, 5.00ml0.040mol L-1Cr(Ⅵ)and 8min microwave interaction. Then, 90.0% of malachite Creen is removed and 67.0% for COD. On original condition that pH=3.2, kinetic equation for Fenton reaction in case of microwave radiation to deCrade malachite Creen is as the following: V=0.004574×[Malachite Creen]1.153×[Cr6+]0.6712×[H2O2]0.2951.Couple of microwave-Fenton possesses of synergistic effects which enable quick deCradation velocity of rhodamine B; for the rhodamine B solution with the concentration of 100mg/L, the optimum experimental condition is as these: pH=3.0, 0.70ml30%H2O2, 4.00ml0.020mol/LFe(Ⅱ) and 8min microwave interactions. Then, 99.9% of rhodamine B is removed and 90.2% for COD. On original condition that pH=3.0, kinetic equation for Fenton reaction in case of microwave radiation to deCrade rhodamine B is as this: V=0.064085×[Rhodamine B]0.4089×[Fe2+]1.4655×[H2O2]0.2562.Combination of microwave and Fenton-like agents possess of synergistic effects which enable quick deCradation velocity of rhodamine B; for the rhodamine B solution with the concentration of 100mg/L, the optimum experimental condition is as these: pH=3.4, 1.00ml 30 % H2O2, 4.00ml0.040 mol L-1Cr(Ⅵ) and 8min microwave interactions. Then, 99.0% of rhodamine B is removed and 80.4% for COD. On original condition that pH=3.4, kinetic equation for Fenton reaction in case of microwave radiation to deCrade rhodamine B is as the following: V=8.29182×10-5×[Rhodamine B]0.8763×[Cr6+]1.3719×[H2O2]0.5975.
|
PDF Full Text Request