Figure 2: H2 evolution under visible light irradiation.

(a) H2 evolution in the absence (A) and presence (B) of chitosan (1.0 g l−1), containing MPA-CdTe QDs (0.86 × 10−6 mol l−1), [Fe2(CO)6(μ-adt)CH2C6H5] catalyst (1.00 × 10−5 mol l−1) and H2A (0.10 mol l−1) in methanol/water (1:3 v-v); (b) H2 evolution as a function of chitosan concentrations, containing MPA-CdTe QDs (0.86 × 10−6 mol l−1), [Fe2(CO)6(μ-adt)CH2C6H5] catalyst (1.00 × 10−5 mol l−1) and H2A (0.10 mol l−1) in methanol/water (1:3 v-v); (c) H2 evolution at various pH values, containing MPA-CdTe QDs (0.86 × 10−6 mol l−1), [Fe2(CO)6(μ-adt)CH2C6H5] (1.00 × 10−5 mol l−1), H2A (0.10 mol l−1) and chitosan (1.0 g l−1) in methanol/water (1:3 v-v); (d) H2 evolution under the optimized conditions in the absence (A) and presence (B) of chitosan, containing MPA-CdTe QDs (1.71 × 10−6 mol l−1), [Fe2(CO)6(μ-adt)CH2C6H5] (1.00 × 10−6 mol l−1) and H2A (0.20 mol l−1) in methanol/water (1:3 v-v) at pH 4.5. Error bars represent mean±s.d. of parallel experiments.