Solid Phase Extraction of Trace Amounts of Praseodymium Using Transcarpathian Clinoptilolite

Abstract

Sorptive properties of the Transcarpathian clinoptilolite towards Pr(III) were studied under dynamic conditions. The sorption capacity of clinoptilolite under optimal conditions (sorbent grain diameter of 0.20–0.31 mm; pH 9.0, temperature of preliminary precalcination of 350 °C, and flow rate of the Pr(III) salt solution with the concentration of 1.0 μg·mL−1 through the sorbent of 5 mL·min−1) was equal to 47.5 mg·g−1. The best desorbent of Pr from the clinoptilolite was the 1 M solution of KCl acidified with HCl to a pH value of 3.0. The method of Pr(III) trace amounts preconcentration in a solid phase extraction mode with further determination of this REE via spectrophotometric technique was developed. The linearity of the proposed method was evaluated in the range of 2–100 ng·mL−1 with detection limit of 0.7 ng·mL−1.

Sorption of gadolinium on acid-modified clinoptilolite

“…Dependence of the sorption capacity of acid-modified clinoptilolite towards Gd(III) upon the temperature of thermal pretreatment (the concentration of Gd(III) was 1.0 g/mL; pH 10.0; 1.510 -4 Ì borate buffer solution) solution ( Table 2). Similar dependence were earlier found for clinoptilolite towards Tb and Pr [9,11]. These results can be associated with different abilities of Gd(III) ions to form hydroxo-complexes at low and high concentrations.…”

“…Sorptive properties of natural form and H-form of Transcarpathian clinoptilolite depend significantly on their preliminary thermal treatment [8][9][10][11]15]. The corresponding data are shown in Fig.…”

“…This may be the reason for a decrease in its sorption efficiency. The surface OH-groups are mainly the adsorptionactive centers of various forms of Transcarpathian clinoptilolite towards metal ions [8][9][10][11]. A drastic increase in the sorption efficiency of H-clinoptilolite samples calcined at the temperature of 300 0 C is due to the growth of the surface OH-groups in the zeolite structure [10].…”

“…Clinoptilolite is the most widely spread natural zeolite. It is often used as sorbent in the solid phase extraction methods and in sorptionluminescent methods for the determination of inorganic and organic substances microquantities [6][7][8][9][10][11][12]15]. This zeolite is characterized by stability to aggressive medium, mechanical strength, high sorption capacity and selectivity, ability of modification and regeneration, thermal stability, low cost and accessibility.…”

Anticorrosive paint with a modified zeolite as functional pigment for SAE 1010 steel protection

“…This structure is characterized by the presence of cavities and intercommunicated channels, usually occupied by water molecules and interchangeable extra-reticular cations (Calabrese, 2018). Its properties of high surface area, elevated cation exchange capacity and acidity justify the wide use of zeolites as adsorbents, catalysts, ion exchange agents, antimicrobials (Al-subaie et al , 2015; Rojas-Pavón et al , 2015; Kozhevnikova and Styazhkina, 2013; Stashkiv et al , 2019; Alshameri et al , 2019; Kustovska, 2018; Iyigundogdu et al , 2014; Kabwadza-Corner et al , 2014) and, in our case, as containers that allow a gradual release of corrosion-inhibiting ions (Ahmed et al , 2011; Dias et al , 2012; Ferrer et al , 2014; Shaw and Tiwari, 2016; Dias et al , 2014; Roselli et al , 2014; Roselli et al , 2018; Abd El-Gawad et al , 2019).…”