Table 1. Average Crystallite Sizes Calculated for 1–8 from the XRD Data Using (eq 1)^a.

no.	sample	average crystallite size (nm)	% decolorization of Congo red after 25 min	optical band gap energy (eV)
1	Ni-WC	34	86	2.77
2	Co-WC	4	66	2.50
3	Ni-MoC	25	94	2.00
4	Co-MoC	22	72	1.83
5	NiCo-WC	7	97	2.3
6	NiCo-MoC	15	72	2.34
7	NiFe-WC	22	44	1.97
8	NiFe-MoC	32	41	1.66

^aThe % decolorization of Congo red after 25 min of photocatalytic reaction time in the presence of the TMC catalyst. The optical band gap energy was determined using the Tauc plots of 1–8.