The formation mechanism and photocatalytic activity of hierarchical NiAl-LDH films on an Al substrate prepared under acidic conditions.

NiAl-LDH films with hierarchical morphology have been fabricated by immersion of an Al substrate in Ni(2+)-containing solutions under strong acidic conditions, and the growth processes of the films are discussed in this communication. The as-prepared LDH films exhibit high activity in the photocatalytic degradation of organic contaminants.