Ultrasound-assisted synthesis of single layer MgAl hydrotalcite for the removal of Cr(VI) in solution and soil

Insight into chromium adsorption from contaminated soil using Mg/Al LDH-zeolite

“…In comparison, Fe/Al-LDHs were applied to soil with a significantly higher Cr(VI) content of 2079.84 mg/kg, albeit with a shorter reaction time of 90 min. In comparison to Mg/Al-LDHs from another study, which exhibited an immobilization efficiency of 62.27 % at a Cr(VI) concentration of 1000 mg/kg in soils, the LDH-zeolite blend in this study demonstrates superior effectiveness under less extreme conditions [ 59 ]. However, it is important to note that Fe/Al-LDH-activated carbon and Ca/Al-LDH from other investigations displayed higher efficiencies under their specific conditions, with Fe/Al-LDH-activated carbon achieving an impressive 99.50 % efficiency at a much higher initial Cr(VI) concentration, and Ca/Al-LDH exhibiting efficiencies ranging from 85.50 % to 96.49 %, albeit under longer incubation times and varying Cr concentrations [ 60 , 61 ].…”

“… Adsorbents Experimental conditions Cr(VI) immobilization efficiency References MALZ Absorbent and soil ratio (w/w): 3 %, Cr concentraton: 50 mg/kg, SM: 70 %, incubation time: 30 days 77.35 % This study Nanoscale Fe/Al-LDHs The mole ratio of Cr(VI) and Fe/Al LDH: 0.2, e-Cr: 38.61 mg/kg 70 % [ 57 ] Fe/Al-LDHs Cr(VI) in the soil (2079.84 mg/kg), Fe/Al-LDH and Cr(VI)-contaminated soil ratio of 1: 5, reaction time: 90 min. 72.45 % [ 58 ] Mg/Al-LDHs Cr(VI) in soils:1000 mg/kg; Quantity of LDHs: 10 g/L 62.27 % [ 59 ] Fe/Al-LDH- activated carbon Quantity of LDHs: 0.05 g; Cr(Ⅵ) content:1000 mg/kg; incubation time: 60 min, pH 4 99.50 % [ 60 ] Ca/Al-LDHs Cr: 200–424 mg/kg, incubation time: 120 h 85.50 %–96.49 % [ 61 ] …”