Mg-Fe layered double hydroxide with chloride intercalated: synthesis, characterization and application for efficient nitrate removal

• Published in: Environmental science and pollution research international Vol. 27; no. 6; pp. 5890 - 5900
• Main Authors: Santos, Luciane Cavalcante, da Silva, Anamália Ferreira, dos Santos Lins, Pollyanna Vanessa, da Silva Duarte, José Leandro, Ide, Alessandra Honjo, Meili, Lucas
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.02.2020; Springer Nature B.V
• Subjects: Adsorbents; Adsorption; Aquatic Pollution; Aqueous solutions; Atmospheric Protection/Air Quality Control/Air Pollution; Chemisorption; Chlorides; Chlorides - chemistry; Diffusion rate; Earth and Environmental Science; Ecotoxicology; Environment; Environmental Chemistry; Environmental Health; Environmental science; Hydrogen-Ion Concentration; Hydroxides; Hydroxides - chemistry; Iron; Iron - chemistry; Kinetics; Magnesium; Magnesium - chemistry; Nitrate removal; Nitrates; Nitrates - analysis; Nitrates - chemistry; Nitrogen removal; Nutrient removal; Organic chemistry; Parameter modification; Research Article; Waste Water Technology; Wastewater; Water Management; Water Pollutants, Chemical; Water Pollution Control; Clays; Removal; Hydrotalcite-like; Nitrate; Alternative adsorbents
• ISSN: 0944-1344; 1614-7499
• DOI: 10.1007/s11356-019-07364-4

Mg-Fe layered double hydroxide intercalated with chloride (Mg-Fe-Cl LDH) was synthetized, characterized, and evaluated as adsorbent to remove nitrate from aqueous solution. The pH, initial nitrate concentration, adsorbent dosage, and particle size were investigated. Kinetic data was best represented by pseudo-second order model indicating that the rate limiting step was chemisorption. Intraparticle diffusion model indicates that adsorption kinetic is limited by external and intraparticle diffusion. Sips model was selected, based on R 2 , ARE, and AIC, to adequately represent the adsorption isotherms, which permits to affirm that the adsorption occurs in heterogeneous surface, obtaining the maximum adsorption capacity of 18.17 mg.g −1 at 30  o C. Thermodynamics parameters indicate that the adsorption was spontaneous, exothermic, and with structural modification. These findings come up with Mg-Fe-Cl LDH as a suitable adsorbent for nitrate and could contribute to its removal from the water and wastewater.