Discoloration of reactive red X-3B,a dye,induced by pyruvate under UV irradiation was preliminarily investigated.The effects of pH value,initial concentration of sodium pyruvate and dye,and adscititious Fe(Ⅲ) were di...Discoloration of reactive red X-3B,a dye,induced by pyruvate under UV irradiation was preliminarily investigated.The effects of pH value,initial concentration of sodium pyruvate and dye,and adscititious Fe(Ⅲ) were discussed in detail.The reaction mechanism was preliminarily studied.The result showed that reactive red X-3B solution containing pyruvate could be discoloured by UV irradiation.Under the experimental condition,the apparent kinetic equation of reactive red X-3B was-dc/dt=0.11+0.0017C_P.The initial concentration of pyruvate was the main factor influencing the discoloration efficiency of reactive red X-3B.展开更多
The photochemical reduction of Cr（Ⅵ） in aqueous solutions containing Fe（Ⅲ）-alginate complexes was preliminarily explored under a high-pressure mercury lamp.The effects of pH,the initial concentrations of Fe（Ⅲ...The photochemical reduction of Cr（Ⅵ） in aqueous solutions containing Fe（Ⅲ）-alginate complexes was preliminarily explored under a high-pressure mercury lamp.The effects of pH,the initial concentrations of Fe（Ⅲ） and alginate were also discussed in detail.The kinetics and mechanism of Cr（Ⅵ） photoreduction were analyzed.The results indicated that Cr（Ⅵ） could be photo-reduced by iron（Ⅲ）-alginate complex systems.Under the condition of 0=19.2μmol/L,0=20.0μmol/L,0=0.5g/L and pH=3.0,the reduction efficiency of Cr（Ⅵ） could achieve 97% after 80 min irradiation with a 125W high-pressure mercury lamp.Over the pH range of 2.0-7.0,the reduction efficiency increased with acidity of the solution.The initial rates of Cr（Ⅵ） photoreduction increased with increasing the intitial concentrations of Fe（Ⅲ） and alginate.Fe（Ⅱ）generated by the photolysis of iron（Ⅲ）-alginate complexes was the main reductant.展开更多
文摘Discoloration of reactive red X-3B,a dye,induced by pyruvate under UV irradiation was preliminarily investigated.The effects of pH value,initial concentration of sodium pyruvate and dye,and adscititious Fe(Ⅲ) were discussed in detail.The reaction mechanism was preliminarily studied.The result showed that reactive red X-3B solution containing pyruvate could be discoloured by UV irradiation.Under the experimental condition,the apparent kinetic equation of reactive red X-3B was-dc/dt=0.11+0.0017C_P.The initial concentration of pyruvate was the main factor influencing the discoloration efficiency of reactive red X-3B.
文摘The photochemical reduction of Cr（Ⅵ） in aqueous solutions containing Fe（Ⅲ）-alginate complexes was preliminarily explored under a high-pressure mercury lamp.The effects of pH,the initial concentrations of Fe（Ⅲ） and alginate were also discussed in detail.The kinetics and mechanism of Cr（Ⅵ） photoreduction were analyzed.The results indicated that Cr（Ⅵ） could be photo-reduced by iron（Ⅲ）-alginate complex systems.Under the condition of 0=19.2μmol/L,0=20.0μmol/L,0=0.5g/L and pH=3.0,the reduction efficiency of Cr（Ⅵ） could achieve 97% after 80 min irradiation with a 125W high-pressure mercury lamp.Over the pH range of 2.0-7.0,the reduction efficiency increased with acidity of the solution.The initial rates of Cr（Ⅵ） photoreduction increased with increasing the intitial concentrations of Fe（Ⅲ） and alginate.Fe（Ⅱ）generated by the photolysis of iron（Ⅲ）-alginate complexes was the main reductant.
