Effect of support properties on preparation process and adsorption performances of solvent impregnated resins

A High-Efficiency Approach for the Synthesis of N235-Impregnated Resins and the Application in Enhanced Adsorption and Separation of Vanadium(V)

“…As more extractants accumulate in the mesopores and macropores as multilayer, the impregnation ratio of the N-TIRs is close to the peak (59.9%), which results in that the effective N235 reacting with V(V) does not The results show that the impregnation ratio (η) increase approximately linearly with the increase of the extractants concentration, while the adsorption capacity of the N-TIRs for V(V) firstly increases sharply and then tends to reach saturation with the increasing extractants concentration. According to our previous work [7], the extractant is preferentially adsorbed in the micropores as wall-spreading to form a monolayer, resulting in the relatively lower impregnation ratio at low extractants concentration. Whereas, XAD-16HP resin that was used in this study is mainly composed of mesopores and macropores, with the increasing content of the extractants, the extractants more likely accumulate in these pores as pore-filling to form multilayer, which lead to the higher impregnation ratio at high extractants concentration.…”

“…10 h), implying that the addition of TBP can accelerate the adsorption rate of V(V) to some extent. The two commonly used kinetic models, pseudo-first order kinetic and pseudo-second order kinetic models [11,24], are used to depict the adsorption process of V(V) to verify the promotion mechanism for V(V) adsorption, which are listed as Equations (7) and (8), respectively.…”

“…Solvent-impregnated resins (SIRs) that were prepared by incorporating extractants onto polymeric matrix have been widely applied in the fields of separation and purification for metals [1][2][3] and organics [4,5] from aqueous solutions, due to their high selectivity, operational simplicity, and environmental friendliness [6,7], which can be traced back to the pioneering work that was conducted by Warshawsky [8], Grinstead [9], and Kroebel and Meyer [10] in the early 1970s. Thus, the preparation and application of the SIRs in analytical and environmental chemistry, hydrometallurgy, and radiochemistry fields are still intensive research topics [11].…”

Synthesis of Di-(2-ethylhexyl) Phosphoric Acid (D2EHPA)-Tributyl Phosphate (TBP) Impregnated Resin and Application in Adsorption of Vanadium(IV)

“…Recently, some researchers paid more attention to the separation and recovery of vanadium by using solvent-impregnated resins (SIRs), taking into account of their distinctive selectivity, easy operability and environmental friendliness [9]. Di-(2-ethylhexyl) phosphoric acid (D2EHPA) has been widely used as an excellent extractant for the recovery of vanadium because of its low price, high extraction efficiency, and the effective separation of vanadium(IV) (V(IV)) from impurity ions [10,11], therefore it was used by many researchers to prepare SIRs for the separation of vanadium [12][13][14]. Liang et al [12] studied the adsorption and separation of V(IV) from the vanadium leaching solution containing Fe(III) and Al(III) with D2EHPA impregnated resins (DIRs).…”

“…It was found that the adsorption capacity of DIRs for V(IV) is only 14.43 mg/g after 18 h reaction and that the process is time-consumed. Tang et al [14] also investigated the vanadium adsorption onto DIRs. The prepared DIRs have adsorption capacity of 19.25 mg/g for V(IV) at the reaction time of 12 h. From the studies mentioned above, it can be seen that the sole-extractant impregnated resins generally need a long time to achieve adsorption equilibrium with V(IV) and they also present unsatisfactory separation capability for the aimed ions, which may limit their application in industry.…”