Summary of rate constants of photocatalytic reduction of Cr(vi) over the samples.

Samples	Rate contants (min−1)	R 2
CdS/MOA(Cr)-3	0.6 × 10−2	0.93
CdS/MOA(Cr)-13	1.1 × 10−2	0.98
CdS/MOA(Cr)-20	5.3 × 10−2	0.95
CdS/MIL-100-20	1.4 × 10−2	0.93
CdS/MOA(Cr)-2-post	3.6 × 10−2	0.98