Accuracy Evaluation of Multicomponent Spectrophotometry and Its Application in Real-Time Monitoring of the Degradation of Dyes in Mixed Solutions

With methyl orange, Congo red, rhodamine B, methyl violet and methylene blue as the research objects, the accuracy of spectrophotometry in determining the dye concentration of two-component and three-component solutions with different ratios was evaluated. The experimental results showed that when the interference among dyes was small, the measurement errors of two-component and three-component solutions were less than 5 and 10%, respectively. Meanwhile, multicomponent spectrophotometry was applied to a degradation experiment of & beta;-FeOOH to test its catalytic degradation performance in the mixed solution of methyl orange and Congo red. The results showed that in the case of single components, the degradation rate of methyl orange and Congo red with & beta;-FeOOH was 44.64 and 71.95% (4 h), respectively, while in the mixed solution, it was 29.54 and 80.17% (4 h), respectively. The significance of this work is to evaluate the accuracy of multicomponent spectrophotometry and provide a low-cost as well as a rapid method for evaluating the multicomponent catalytic ability of photocatalysts.