The isotherm constants of Cu(ii) and MB adsorption on the WP/PAM.

Model	Parameters	Cu(ii)			MB
		15 °C	25 °C	35 °C	15 °C	25 °C	35 °C
Langmuir parameters	Q m (mg g−1)	130.4	142.2	145.3	1677.7	1714.5	1734.9
	K L (L mg−1)	0.1356	0.1767	0.4046	1.3847	0.9662	2.0530
	R L 2	0.9849	0.9935	0.9949	0.9979	0.9662	0.9708
Freundlich parameters	K F (mg g−1)	88.1	99.2	108.1	1533.3	1593.4	1621.3
	n	17.11	18.32	21.16	72.31	79.24	78.56
	R F 2	0.5807	0.5816	0.5761	0.8141	0.7617	0.9014
Dubinin–Radushkevich parameters	Q m (mg g−1)	126.4	138.6	143.3	1672.6	1707.4	1730.5
	E (kJ mol−1)	20.88	24.35	25.98	10.20	8.573	15.90
	R 2	0.9923	0.9197	0.9649	0.9300	0.9891	0.9064