The sorption of palladium-thiocyanate complex onto polyurethane foam (PUF) has been investigated and optimized from aqueous solution of different pHs (1-10) and of acids of varied concentration (0.01-0.5 M). Maximum sorption (similar to 99%) of palladium (9.4 x 10(-5) M) in the presence of thiocyanate (1.25 x 10(-2) M) ions has been achieved from 0.1 M hydrochloric acid solution within 5 min equilibrating time. The variation of palladium concentration (1.03 x 10(-4) -1.16 x 10(-3) M) data were subjected to different sorption isotherms. The data followed both Freundlich and Dubinin-Radushkevich (D-R) isotherms very well, but Langmuir isotherm is not obeyed at very low concentration. The Freundlich parameters 1/n = 0.54 +/-0.02 and of C-m = 35 +/-7 mmol g(-1) have been evaluated, whereas D-R isotherm yields beta = -0.003277 +/-0.000193 kJ(2) mol(-2), X-m = 1.01 +/-0.16 mmol g(-1), and of E = 12.3 +/-0.35 kJ mol(-1). The Langmuir isotherm gives the value of Q = 0.27 +/-0.08 mmol g(-1) and of b = (2.83 +/-0.06) x 10(4) L mol(-1). The temperature variation (15-55 degreesC) studies have given values of DeltaH = -48.9 +/-2.5 kJ mol(-1), DeltaS = -127.3 +/-8.2 J mol(-1) K-1, and DeltaG = -25.2 kJ mol(-1) at 298 K. Among the ions tested, thiourea, cyanide, thiosulphate, molybdate, nitrite, and Fe(II) reduce the sorption significantly (31-70%).