Based on the study of the absorption of simulated wastewater containing cadmium ion on nanoscale humic acid using static method

the adsorption column experimental device was set up to study the dynamic adsorption and elution characteristics of simulated wastewater containing cadmium ion

and the influence factors such as cadmium ion concentration

adsorption (de-sorption) temperatures

coexisting ions

feed rate on the breakthrough adsorption capacity and saturated adsorption capacity were investigated. The kinetic mechanism of column adsorption process on nanoscale humic acid was studied by using Thomas model

and the breakthrough adsorption capacity and saturated adsorption capacity of nanoscale humic acid after regeneration were determined. The results showed that the initial cadmium ion concentration was 150 mg·L-1 and the feed rate was 10 ml·min-1

the saturated adsorption capacity was 426.3 mg·g-1 and 405.5 mg·g-1

respectively. The saturated adsorption capacity in Thomas model was 364.1 mg·g-1

436.1 mg·g-1 and 441.9 mg·g-1

respectively. The cadmium ion concentration at eluting peak was 3.3 g·L-1

12.0 g·L-1 and 22.0 g·L-1

respectively. The concentration of co-existing ions SO42- was increased

and the breakthrough and saturated adsorption amount of nanoscale humic acids for cadmium ion was reduced. Adsorption and de-sorption temperature were conducted with normal temperature condition. After adsorption and regeneration for 30 times

the breakthrough adsorption capacity and saturated adsorption capacity did not significantly decrease. The performance of nanoscale humic acid before and after adsorption and regeneration was characterized by FT-IR

SEM and EDS

respectively. The results showed that nanoscale humic acid had good stability of physical and chemical performances

the morphology had no obvious change

the scale decreased slightly

both the amide and hydroxyl on the surface and in the internal played an effective role

and thus this material can be used repeatedly.