Removal of triphenylmethane dyes by calcium carbonate–lentinan hierarchical mesoporous hybrid materials.

An inorganic–organic hybrid material with hierarchical mesoporous structure was prepared by involving lentinan (LTN) into CaCO 3 crystal using a simple method at mild condition. The characterization of CaCO 3 –LTN hybrid materials indicated that it has higher surface area, more adsorption sites and better dispersion in water compared to bare CaCO 3 crystal due to rich organic ligands of LTN and hierarchical structure. CaCO 3 –LTN hybrid materials was applied to the removal of triphenylmethyl dyes (TPMs) including crystal violet (CV), malachite green (MG) and aniline blue (AB). A powerful adsorption capability of the hybrid materials to dyes was observed, and moreover, it was found that a very rapid and efficient oxidative degradation of dyes by H 2 O 2 can be achieved in the assist of CaCO 3 –LTN hybrid materials due to the reactants concentrated into its plentiful and negative charged pores. CV, MG, and AB can be complete decolorized by H 2 O 2 + CaCO 3 –LTN after 30 min, 10 min, and 2 min, respectively. Moreover, cation dyes, besides TPMs, were also suitable to be treated by this H 2 O 2 + CaCO 3 –LTN system. These results ensure the CaCO 3 –LTN hybrid material a promising candidate for treatment of effluent of textile industry. [ABSTRACT FROM AUTHOR]