Preparation of Nano BiOCl Microsphere and Its Fabrication Machanism
Nano BiOCI microsphere was prepared by the solvothermal method using glycol as solvent. The as-prepared nano microsphere was composed numerous BiOCl nanoplates, which are fabricated together to form opening microporous structure. The preparation of BiOCl under different solvothermal conditions indicated that the formation of nano microsphere follows a glycol-assisted growth process. Two oxygen atoms in glycol coordinate with one or two Bi3+ ions to produce Bi3+-containing complexes. During the solvothermal treatment, glycol molecules were condensed via the catalysis of Bi3+ ions to produce H2O, which promoted the hydrolysis of Bi3+-containing complexes and the formation of a BiOBi structure in turn. The BiOBi structure then combines the Bi3+ in the solution via the interlinking action of the glycol and leads to the formation of BiOCl substructure. The BiOCl substructure grows up radially from the crystal nucleus to form a nano microsphere structure. The surface microporous structure of the nano microsphere favors the adsorption and the mass exchange of the dyes, consequently, the as-prepared BiOCl nano microsphere exhibits a good dye-sensitized visible light photocatalytic activity.
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