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National Natural Science Foundation of China, NSFC, (51974205); International Science and Technology Cooperation Program of Shanxi Province, (2022EHB016); Consejo Nacional de Humanidades, Ciencias y Tecnologías, Conahcyt, (CVU 1327530)
Sodium oleate (NaOL) is commonly employed as a traditional organic collector during the flotation process of phosphate ore. However, the residual NaOL in mineral processing wastewater not only poses a great threat to the environment, but also reduces the qualities of subsequent flotation products. In this study, an effective adsorbent graphene oxide/polyethyleneimine (GP) composite hydrogel was prepared and applied for the adsorption of NaOL. The successful association between GO and PEI was elucidated through various characterizations. Further to that, the adsorption performance was systematically determined through adsorption isotherm, adsorption kinetics, co-existing ions and reusability experiments. The results clearly demonstrated that the adsorption behavior of NaOL could be well described by both pseudo-second-order (PSO) kinetic and Langmuir isotherm models. GP composite hydrogel was able to achieve superior NaOL adsorption with an excellent adsorption capacity (295.95 mg/g) and a quick kinetic (120 min). The existence of competitive ions, such as CO32−, SO42− and PO43−, had a negative effect on NaOL adsorption. The mechanism investigation suggested that chemical adsorption and hydrogen bonds were central and played imperative roles for the adsorption of NaOL on GP composite hydrogel. Overall, the current work provides a valuable reference for the efficient adsorption of NaOL.
Efficient adsorption of sodium oleate from wastewater with graphene oxide/polyethyleneimine composite hydrogel: Performance and mechanism
Adsorption behavior; Adsorption mechanism; GP composite hydrogel; Sodium oleate Adsorption isotherms; Flotation; Gas adsorption; Hydrogels; Phosphate ore treatment; Reusability; Wastewater treatment; Adsorption behaviour; Adsorption mechanism; Composite hydrogels; Flotation process; Graphene oxide/polyethyleneimine composite hydrogel; Graphene oxides; Organics; Performance; Poly(ethyleneimine); Sodium oleate; Hydrogen bonds
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