RT Journal Article
T1 Anti-inflammatory drug diclofenac removal by a synthesized MgAl layered double hydroxide
A1 Mkaddem, H.
A1 Rosales Villanueva, Emilio
A1 Pazos Currás, Marta María
A1 Ben Amor, H.
A1 Sanromán Braga, María Ángeles
A1 Meijide Fernandez, Jessica
K1 3308.10 Tecnología de Aguas Residuales
K1 3308.11 Control de la Contaminación del Agua
K1 3303 Ingeniería y Tecnología Químicas
AB Layered double hydroxides (LDHs) containing Mg:Al (molar ratio 3:1) were synthesized by coprecipitationfrom nitrate salts under alkaline conditions. Their further characterisation by different techniquesallowed the determination of their structural, nanotextural and chemical properties. XRD measurementsconfirmed the high crystallisation with the presence of two metal cations (Mg2+ and Al3+).The use of these materials as eco-friendly adsorbents was analysed to remove diclofenac from wastewater.Under optimal conditions (0.4 g L 1, 30 ppm initial pollutant concentration, pH   8.5), around 65%diclofenac removal was achieved after 60 min of treatment. The pseudo-second kinetic order model andFreundlich isotherm accurately described the experimental data, suggesting chemisorption process onthe heterogeneous LDH surface. After diclofenac adsorption, XRD analysis revealed an increase in interlayerspacing followed by contraction of adjacent layers, so that anion exchange between layer was consideredto be the main mechanism for diclofenac adsorption. Thermodynamic studies indicate diclofenacadsorption occurs spontaneously, endothermically, and also, with increasing randomness at the solid/solutionsurface. Batch test revealed limitations in terms of long-term stability of the material. Therefore, apost-synthesis strategy, calcination, was required to increase the degree of resistance. For this purpose,the effect of calcination temperature was examined in the range 200–300  C. Although, the kinetic rateconstant decreased slightly after calcination, the improvement of its structural properties allowed tooperate under continuous system.
PB Journal of Molecular Liquids
SN 01677322
YR 2022
FD 2022-08
LK http://hdl.handle.net/11093/4253
UL http://hdl.handle.net/11093/4253
LA eng
NO Journal of Molecular Liquids, 359, 119207 (2022)
NO Financiado para publicación en acceso aberto: Universidade de Vigo/CISUG
NO Ministerio de Ciencia e Innovación | Ref. PID2020- 113667 GB-I00
DS Investigo
RD 09-dic-2023