Degradation of methylene blue by natural manganese oxides: kinetics and transformation products.

ABSTRACT: In this study, natural manganese oxides (MnO _x ), an environmental material with high redox potential, were used as a promising low-cost oxidant to degrade the widely used dyestuff methylene blue (MB) in aqueous solution. Although the surface area of MnO _x was only 7.17 m² g^-1, it performed well in the degradation of MB with a removal percentage of 85.6% at pH 4. It was found that MB was chemically degraded in a low-pH reaction system and the degradation efficiency correlated negatively with the pH value (4-8) and initial concentration of MB (10-50 mg l^-1), but positively with the dosage of MnO _x (1-5 g l^-1). The degradation of MB fitted well with the second-order kinetics. Mathematical models

SUBMITTER: Zhou S 

PROVIDER: S-EPMC6689640 | biostudies-literature | 2019 Jul

REPOSITORIES: biostudies-literature