Journal
ENVIRONMENTAL TECHNOLOGY
Volume 42, Issue 8, Pages 1252-1259Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/09593330.2019.1663937
Keywords
Aminoanthraquinone; silica gel; solid-phase extraction; Pb(II); Density Functional Theory (DFT)
Categories
Funding
- Mahasarakham University
- Center of Excellence for Innovation in Chemistry (PERCH-CIC), Office of the Higher Education Commission, Ministry of Education
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The study synthesized silica gel chemically bonded with derivatives of aminoanthraquinone to produce adsorbents for heavy metal solutions. Among the adsorbents tested, SL3 showed the best adsorption efficiency for Pb(II) at 82.5% under optimized conditions. Density Functional Theory calculations indicated stable complex formation between the sensor and Pb(II) through cation-dipole interactions, leading to successful pre-concentration of trace Pb(II) in environmental samples.
In this project, silica gel chemically bonded with derivatives of aminoanthraquinone were synthesized and characterized. Adsorbents 1,8-aminoanthraquinone-3-aminopropylsilica (SL1), 2-aminoanthraquinone-3-aminopropylsilica (SL2) and 1-aminoanthraquinone-3-aminopropylsilica (SL3) were produced and tested to adsorb heavy metal solutions including Pb(II) Cu(II) Zn(II) Cd(II) and Co(II). The concentrations of the adsorbed heavy metals solution were calculated by atomic adsorption spectrophotometry employing a batch method. The results showed that speed at 200 rpm for 30 min with pH 9 is the optimum condition for heavy metal adsorption. The result also indicated that adsorbent SL3 is the best adsorbent for Pb(II) at 82.5%, and the relative standard deviation (R.S.D.) was lower than 6%. The method detection limit was 1.1 mu g L-1 for Pb2+. In addition, Density Functional Theory (DFT) calculation results suggested that the adsorbent sensor formed stable complexes with Pb(II) through a large number of cation-dipole interactions. The method was also applied with satisfactory results to the pre-concentration of trace Pb(II) in environmental samples.
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