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The adsorption mechanism of Al(III) and Fe(III) ions on bastnaesite surfaces

Cao Shiming, Cao Yijun, Ma Zilong, Liao Yinfei

Physicochemical Problems of Mineral Processing

2019

Vol. 55, iss. 1

97--107

The adsorption mechanism of Al(III) and Fe(III) ions on bastnaesite surfaces was investigated by a combination of DFT calculation, XPS analysis, adsorption isotherm study and adsorption kinetic investigations. DFT calculation results indicated that ≡CeOH0 and ≡CO3H0 are primary functional groups on bastnaesite surfaces. XPS analysis reveals that Al(III) and Fe(III) ions adsorbed onto the bastnaesite surfaces through the interaction between aluminium/iron hydroxide species and oxygen atoms of surface ≡CeOH0 groups. No interaction between aluminium/iron hydroxide species and ≡CO3H0 groups was detected. Adsorption isotherm studies demonstrated that the adsorption data of Al(III) and Fe(III) ions is fitted relatively well by Freundlich equations, the adsorption kinetic characteristics fitted to pseudo-second order model. Freundlich constants suggested favorable process for Al(III) and Fe(III) ions adsorption, and each adsorbed metal hydroxide specie complex with at least two oxygen atoms of surface ≡CeOH0 groups.

Tetrahydroxyflavanol-modified TiO2 nanoparticles for solid phase extraction of trace Al(III) and Cr(III) from food and natural water samples

Zheng H., Ma S.

Chemia Analityczna

2009

Vol. 54, No. 6

1309-1320

In this work, a novel method using a microcolumn packed with tetrahydroxyflavanol-modi-fied TiO, nanoparticles lor simultaneous preconcentration of trace AI(III) and Cr(IlI) prior to their ICP-OHS determination has been developed. Separation/preconcentration conditions, including pll, sample flow rate and volume, as well as elution conditions and the effect of interfering ions on the recovery of the analytes were investigated. At pH 4, absorption capacity of tetrahydroxyflavanol-modified nano-TiO, was 6.75 mg g-1 and 9.69 mg g-1for AI(III) and Cr(III). respectively. Detection limits (3o) of Al(III) and Cr(III) were 0.49 and 0.21 ng mL-1, respectively. The method was successfully applied to the determination of trace Al(III) and Cr(lII) ions in food and water samples with satisfactory results.

Opracowano nową metodę zatężania śladowych ilości Al(III) i Cr(III) przed oznaczaniem techniką ICP OILS z użyciem mikrokolumny wypełnionej nanocząstkami TiO2 modyfikowanymi tetrahydraksyflawanolem. Zoptymalizowano warunki prowadzenia procesu: pH, szybkość przepływu roztworu próbki, warunki wymywania analitów, a także przeszkadzający wpływ wybranych jonów na ich odzysk. Stwierdzono, że przy pH 4 pojemność sorpcyjna zastosowanego złoża wynosiła 6,75 i 9,69 mg g-1 odpowiednio dla AI(III) i Cr(III). Granice wykrywalności Al(lll) i Cr(III) wynosiły odpowiednio 0,49 i 0,21 ng g-1. Metodę z powodzeniem zastosowano do oznaczania śladowych ilości Al(IlI) i Cr(III) w wodach i produktach żywnościowych.