First order rate constant (K₁) and regression coefficient (R²) of the prepared samples at doses of 0.1 and 0.2 g of photocatalyst.

Sample ID	For 0.1 g of photocatalyst		For 0.2 g of photocatalyst
	K 1	R 2	K 1	R 2
HAp	0.00199	0.9631	0.00567	0.99286
0.32Cu_HAp	0.00467	0.98708	0.00265	0.99925
0.63Cu_HAp	0.00494	0.94516	0.00672	0.9985
1.25Cu_HAp	0.00474	0.98496	0.00752	0.95003
2.5Cu_HAp	0.00320	0.94525	0.01236	0.97622
5Cu_HAp	0.00153	0.95695	0.00689	0.98331
Average	0.00368	—	0.00696	—