Cetylpyridinium Bromide/Polyvinyl Chloride for Substantially Efficient Capture of Rare Earth Elements from Chloride Solution

Abstract

A new sorbent cetylpyridinium bromide/polyvinylchloride (CPB/PVC) was prepared and tested to extract rare earth elements (REEs) from their chloride solutions. It was identified by FTIR, TGA, SEM, EDX, and XRD. The impact of various factors such as pH, RE ion initial concentration, contacting time, and dose amount via sorption process was inspected. The optimum pH was 6.0, and the equilibrium contact time was reached at 60 min at 25 °C. The prepared adsorbent (CPB/PVC) uptake capacity was 182.6 mg/g. The adsorption of RE ions onto the CPB/PVC sorbent was found to fit the Langmuir isotherm as well as pseudo-second-order models well. In addition, the thermodynamic parameters of RE ion sorption were found to be exothermic and spontaneous. The desorption of RE ions from the loaded CPB/PVC sorbent was investigated. It was observed that the optimum desorption was achieved at 1.0 M HCl for 60 min contact time at ambient room temperature and a 1:60 solid: liquid phase ratio (S:L). As a result, the prepared CPB/PVC sorbent was recognized as a competitor sorbent for REEs.

Characteristic Aspects of Uranium(VI) Adsorption Utilizing Nano-Silica/Chitosan from Wastewater Solution

“…In addition, it is a significant aspect of decreasing the adsorbent purification cost. Many aspects affect the desorption efficiency via batch methods, such as eluting concentration, S:L phase ratio, along with desorbing time [ 63 , 64 , 65 ].…”

Selective Recovery of Cadmium, Cobalt, and Nickel from Spent Ni–Cd Batteries Using Adogen® 464 and Mesoporous Silica Derivatives

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“…Nonetheless, their availability is restricted to few and rapidly depleting Chinese reserves, in which mining is often challenging [ 6 , 11 , 12 ]. The European Commission is prioritizing the disengaging from this compulsory dependence by directing the scientific research toward innovative solutions for the recovery of critical REEs from WEEE [ 7 , 10 , 11 , 13 , 14 , 15 ]. In this way, both socio-economic benefits, due to the possibility of diversifying REEs supply, and environmental benefits, due to the minimization of the disposal of harmful wastes in soil and water, could be achieved [ 10 , 14 , 16 , 17 ].…”

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