Probing lead acetate in solution using X-ray diffraction

doi:10.1016/j.molliq.2023.123382

Probing lead acetate in solution using X-ray diffraction

2023-12-01

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DOI：10.1016/j.molliq.2023.123382

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For the purpose of water purification involving toxic metal sensing and removal, high energy X-ray diffraction experiments have been performed on lead acetate Pb(Ac)2 solutions, liquid and amorphous glutathione disulfide (GSSG), and their mixtures. The data have been interpreted using Empirical Potential Structure Refinement and pair distribution function analysis. At the highest concentration of 1 M Pb(Ac)2 in water, the lead molecules are found to cluster and the second shell in the water structure becomes slightly more ordered as the water molecules become compressed. Liquid and amorphous GSSG are found to hydrogen bond primarily via OH-O interactions, while NH-O bonds are much more distorted. Aqueous solutions of Pb(Ac)2 + GSSG show the closest Pb-O (carboxyl) and Pb-N (amine) bonds both at a distance of 2.5 +/- 0.1 angstrom at a concentration of 1 M Pb(Ac)2 in water. At 0.75 M Pb(Ac)2 in water, strong Pb-S bonds are found at a distance of 2.8 +/- 0.1 angstrom. The implications for lead removal using capacitive deionization are discussed.

Keywords:

X-ray diffraction

EPSR modeling

Lead acetate

Toxic metal removal

Capacitive deionization

Probing lead acetate in solution using X-ray diffraction

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