Synthesis of one-dimensional Bi2O2CO3-Bi(OHC2O4)center dot 2H(2)O heterojunctions with excellent adsorptive and photocatalytic performance

摘要

A one-dimensional (1D) Bi2O2CO3-Bi(OHC2O4)center dot 2H(2)O heterostructure was synthesized by a low temperature solution method using Bi(OHC2O4)center dot 2H(2)O nanorods as templates. Bi2O2CO3 nanosheets vertically grew onto the Bi(OHC2O4)center dot 2H(2)O rods along the long axial direction. Its adsorption capacity for organic pollutants was evaluated using methyl orange (MO) as a model. The results showed that the Bi2O2CO3-Bi(OHC2O4)center dot 2H(2)O heterostructure had an excellent adsorption capacity of 95.78 mg g(-1) and repeatability for MO. The Bi2O2CO3-Bi(OHC2O4)center dot 2H(2)O heterostructure also possessed excellent photocatalytic activity to degrade dyes (MO, RhB and MB) under solar/UV light irradiation. 20 mg L-1 of RhB, 30 mg L-1 of MB and 75 mg L-1 of MO could be completely degraded by the Bi2O2CO3-Bi(OHC2O4)center dot 2H(2)O photocatalyst in 15, 25 and 120 min, respectively. This superior adsorptive and photocatalytic performance is ascribed to the synergistic effect of the big BET surface area and the formation of a number of junctions in the Bi2O2CO3-Bi(OHC2O4)center dot 2H(2)O heterostructure. A trapping experiment of the active species during the photocatalytic degradation was carried out, and the result indicates that the O-2(-center dot) radical and h(+center dot) play a major role in the photocatalytic degradation process. This study provides a general and effective method to fabricate a unique 1D Bi2O2CO3-Bi(OHC2O4)center dot 2H(2)O heterostructure with both photocatalytic and adsorptive performance on a large scale.