Dubinin–Radushkevich isotherm parameters of phenol compound adsorption onto the studied materials.

Adsorbent materials	2,6-Dimethylphenol				4,4′-Dihydroxybiphenyl
	q m, exp, mg g−1	K ad, mol2 J−2	E, kJ mol−1	R 2	q m, exp, mg g−1	K ad, mol2 J−2	E, kJ mol−1	R 2
CuHEDP	1.29	2 × 10−5	0.16	0.9701	2.09	2 × 10−5	0.16	0.8939
+ [BMIM][OTF]	3.69	1 × 10−5	0.22	0.9544	3.09	2 × 10−5	0.16	0.885
+ [BMIM][NO3]	4.20	9 × 10−6	0.24	0.9147	3.90	1 × 10−5	0.22	0.9211
+ [BMIM][Cl]	4.88	6 × 10−6	0.29	0.9376	4.07	8 × 10−6	0.25	0.9684
+ [HMIM][Cl]	5.28	6 × 10−6	0.29	0.9319	4.17	6 × 10−6	0.29	0.9989
NiHEDP	4.88	5 × 10−5	0.10	0.9905	2.47	2 × 10−5	0.16	0.9061
+ [BMIM][OTF]	7.87	4 × 10−5	0.11	0.9976	3.27	1 × 10−5	0.22	0.9032
+ [BMIM][NO3]	9.72	4 × 10−5	0.11	0.9960	4.13	8 × 10−6	0.25	0.9074
+ [BMIM][Cl]	12.59	4 × 10−5	0.11	0.9990	4.53	6 × 10−6	0.29	0.9557
+ [HMIM][Cl]	13.29	3 × 10−5	0.13	0.9976	5.00	6 × 10−6	0.29	0.9185
CoHEDP	6.57	1 × 10−5	0.22	0.9812	3.78	1 × 10−5	0.22	0.9711
+ [BMIM][OTF]	10.2	2 × 10−5	0.16	0.9973	4.37	9 × 10−6	0.24	0.9638
+ [BMIM][NO3]	14.3	2 × 10−5	0.16	0.9980	5.33	6 × 10−6	0.29	0.9358
+ [BMIM][Cl]	16.1	2 × 10−5	0.16	0.9918	7.10	4 × 10−6	0.34	0.8888
+ [HMIM][Cl]	16.9	2 × 10−5	0.16	0.9987	8.00	3 × 10−6	0.41	0.9420
CeHEDP	12.1	4 × 10−5	0.11	0.9907	3.80	9 × 10−6	0.24	0.977
+ [BMIM][OTF]	16.6	2 × 10−5	0.16	0.9998	5.40	6 × 10−6	0.29	0.8642
+ [BMIM][NO3]	18.06	2 × 10−5	0.16	0.9917	6.23	4 × 10−6	0.34	0.8904
+ [BMIM][Cl]	21.7	8 × 10−6	0.25	0.9939	7.40	4 × 10−6	0.34	0.9287
+ [HMIM][Cl]	23.1	7 × 10−6	0.27	0.9989	9.13	4 × 10−6	0.34	0.9296