Preparation of 1-(2-pyridylazo)-2-naphthol functionalized benzophenone/naphthalene and their uses in solid phase extractive preconcentration/separation of uranium(VI)

Abstract

SummaryThe preparation of solid reagent 1-(2-pyridylazo)-2-naphthol functionalized benzophenone/naphthalene for preconcentration/separation of uranium (VI) is described. These reagents enriches uranium(VI) quantitatively from dilute aqueous solutions in the pH range 10.5-11.0. The solid mixture consisting of the enriched metal ion along with solid phase extractant were dissolved in 2ml of acetone and uranium(VI) content was established spectrophotometrically by using Arsenazo III procedure. Calibration graphs were rectilinear over the uranium(VI) concentration in the range 0.002-0.1μg cm

Enrichment/separation of cadmium(II) and lead(II) in environmental samples by solid phase extraction

“…Main properties of the solid phases for solid phase extraction should be high surface area, their high purity and good sorption properties including porosity, durability, and uniform pore distribution. A large variety of efficient solid materials like Amberlite XAD resins [22,26], silica gel [27][28][29][30], chitosan [31], Diaion HP-2MG [32], benzophenone/naphthalene [33], Chelex 100 [34] etc. have been used for solid phase extraction of metal ions at trace levels by various researchers.…”

Synthesis of a Novel Chelating Resin for the Separation and Preconcentration of Uranium(VI) and Its Spectrophotometric Determination

“…As can be seen in Table 3, the adsorption capacity of the resin for U(VI) ions using the column method is higher than chelate modified and/or imprinted SPE procedures reported in the literature up to now. 6,[29][30][31] However, even higher adsorption capacities (>0.102 mmol g -1 ) have been reported in the literature in similar studies using the batch method. 10,18,22 On the other hand, the resin can be successfully regenerated in over 250 operating cycles by the column method without any loss in its sorption capacity.…”

Solid phase extraction using silica gel modified with murexide for preconcentration of uranium (VI) ions from water samples

“…The sorption characteristics of SiAPMS-Mu is compared with those of other sorbents in Table 3 [7][8][9][10][11][12][13][14][15][16][26][27][28][29][38][39][40][41][42][43][44][45][46]. The new synthesized sorbent in the present study shows highest preconcentration factor for U(VI) among other modified silica gel with N-tripropionate-substituted tetraazamacrocycle [29], Quinoline-8- Table 4 Determination of U(VI) in water samples by the proposed sorbent Real sample a Added (g mL −1 ) Found (g mL −1 ) % Extraction (batch method) Added (g mL −1 ) Found (g mL −1 ) % Recovery (column method) ol [28], benzoylthiourea [26], calixarene semicarbazone [27] and catechol [41].…”

“…For this purpose, new sorbent materials such as polymeric resins, activated carbon, naphthalene and silica gel have been developed for more effective extraction. However, some of the sorbents suffer from a number of drawbacks such as long preconcentration time, low mechanical stability of the sorbent, slow kinetics, irreversible adsorption of target and swelling [7][8][9][10][11][12][13][14][15][16][17]. So, there is still a need for developing good sorbent for U(VI) ions.…”