Fig. 6. (a) Photocatalytic hydrogen produc-tion of samples under full range irradiation(λ ≥ 250 nm) in sodium sulfite aqueoussolution (0.05 M), (b) average photo-catalytic hydrogen production rate underfull range irradiation (λ ≥ 250 nm) andvisible light irradiation (λ ≥ 400 nm).