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• W4308455787 startingPage "100754" @default.
• W4308455787 abstract "• LDH-Pb show complete chromium removal despite environmental complexities. • 5 times higher Cr-filtration capacity of LDH-Pb modified syringe filters than LDH. • Proof-of-concept is shown by treating collected chromium contaminated groundwater. • Pb 2+ containing LDH get stabilized with CrO 4 2- through strong complexation. • Chrome recovery from LDH-Pb-Cr at pH < 3 justifies industrial applicability. Layered double hydroxides with high anion exchange capacity and positive surface charge were being explored to remove metal oxo-anions. Environmental complexities such as the presence of other major interfering anions, organic matter, etc., drastically hampers their performance and limit their applicability. Based on the fundamental understanding of strong Pb-Cr complexation, in this work, Pb 2+ incorporated LDH (LDH-Pb) was designed for selective chemisorption of chromate ions overcoming existing environmental limitations of LDH for chromium removal. LDH-Pb was designed by substituting Mg 2+ ions of Mg/Al LDH with Pb 2+ during crystallization process. Pb 2+ have shown efficient incorporation at M II crystal sites of Mg/Al LDH and also sorbed in form of oxy-hydroxide on the surface. Pertaining to faster Pb-Cr complexation, strong binding, and formation of insoluble PbCrO 4 , LDH-Pb has shown efficient and higher removal of chromate ions than LDHs. Despite environmental complexities such as varying pH, competitive ions, organic matter, and natural matrices, efficiency of LDH-Pb remained less altered. Direct application (Proof-of-concept) has been shown for extraction of chromate ions and chrome recovery from collected chromite ore processing residue leachate contaminated groundwater samples. Higher-order of removal kinetics and sorption capacity of LDH-Pb (n= 9.2, and 188.7 mg/g) further justified its candidature. Strong Pb-Cr complexation in LDH-Pb further resulted in faster and efficient continuous chromate filtration (47.3 mg/g) with adsorbent loaded syringe filters. Chrome recovery was achieved through easy acid dissolution of LDH from LDH-Pb-Cr waste (pH <3) resulting in chrome particles (monocrystalline micro rods) that have several potential industrial applications in various sectors." @default.
• W4308455787 created "2022-11-12" @default.
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• W4308455787 date "2022-12-01" @default.
• W4308455787 modified "2023-10-16" @default.
• W4308455787 title "Achieving strong Pb-Cr complexation in Mg/Al LDHs for ultrafast chromate ions separation and chrome recovery from complex water matrices" @default.
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• W4308455787 doi "https://doi.org/10.1016/j.enmm.2022.100754" @default.
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