Open AccessSynthesis and Evaluation of Fe(III) Embedded Silane Grafted Layered Double Hydroxide with Reduced Graphene Oxide Support as an Efficient Adsorbent for V(V) and Se(IV) from Aqueous Systems
Author(s) -
S. Suma,
Syeda Seema,
Sharma Manoj,
V.S. Sumi,
S. Rijith
Publication year - 2021
Publication title -
asian journal of chemistry/asian journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.145
H-Index - 34
eISSN - 0975-427X
pISSN - 0970-7077
DOI - 10.14233/ajchem.2021.23176
Subject(s) - chemistry , hydroxide , adsorption , aqueous solution , graphene , langmuir adsorption model , sorption , desorption , langmuir , oxide , layered double hydroxides , titration , potentiometric titration , inorganic chemistry , chemical engineering , organic chemistry , ion , engineering
The objectives of present work emphasize the successful usage of Fe(III) modified layered doublehydroxide clays with reduced graphene support (Si-rGO/LDH-Fe) for the removal of V(V) and Se(IV)from aqueous systems. The precursors along with the modified and sorbent loaded materials weresuccessfully characterized by BET surface area analyzer, SEM-EDS mapping, FTIR, potentiometrictitrations and XPS analysis. Sorption performance of Si-rGO/LDH-Fe towards V(V) and Se(IV) underoptimized conditions such as pH, temperature and concentration were investigated. The equilibriumand kinetic investigations revealed that the adsorption of V(V) and Se(IV) onto Si-rGO/LDH-Fe followsnon-linear Langmuir isotherm and pseudo-second-order model, respectively. The equilibrium reachedwithin 120 min and the Langmuir isotherm fit well with the experimental data. The adsorptionmechanism was proposed to be ligand exchange with electrostatic interactions. Such results indicatedthat V(V) and Se(IV) species interact by the protonated hydroxyl moieties on the surface ofSi-rGO/LDH-Fe. The practical efficacy and effectiveness of Si-rGO/LDH-Fe was also compared withsome of the related works reported so far. The regeneration capacity and reusability of Si-rGO/LDH-Fewere also tested by employing four cycles of desorption experiments.