Phosphate uptake studies on different types of lanthanum‐loaded polymeric materials

Abstract

Three different polymeric materials loaded with La(III) were prepared such as La(III)‐loaded silica‐chitosan composite (LSCC), an inorganic‐organic hybrid material; La(III)‐loaded cross‐linked chitosan beads (LCB), a biopolymer; La(III)‐loaded Duolite C 466 (LDR), a commercially available styrene divinyl benzene co polymer with imino diacetic acid and the adsorption behavior of phosphate on these three adsorbents were investigated in batch mode. The effects of contact time, temperature of solution, adsorbent dosage, initial pH of solutions, and coexistent anions were analyzed. The adsorption capacities of LSCC, LCB, and LDR from 1000 mg L−1 of phosphate solution were 155.4, 84.2, and 74.2 mg/g, respectively. Regenerations of the LSCC, LCB, and LDR were carried out with 0.25 M NaOH solution. All the three adsorbents were selective toward the phosphate ion in the presence of common ions like Cl−, NO3−, SO42−, and HCO3− present in natural water. The Freundlich isotherm model seems to be a better fit than the Langmuir and Dubinin‐Radushkevich isotherm models. Thermodynamic parameters such as ΔG°, ΔH°, and ΔS° were calculated in order to understand the nature of adsorption process. The adsorption kinetics data were best described by the pseudo‐second‐order rate equation. The adsorbents were characterized using SEM with EDX, FTIR and BET surface area. © 2014 American Institute of Chemical Engineers Environ Prog, 34: 146–154, 2015

Synthesis of 4A zeolite containing la from kaolinite and its effect on the flammability of polypropylene

“…Anyway the band around 1272 (PO) and 1200 cm −1 (PO) can be found even at high temperature. Existence of bands of 4A‐La at 3430, 792, and 1001 cm −1 until 800°C also documented zeolite framework was kept during heating.…”

High Efficiency Phosphate Removal Was Achieved by Lanthanum-Modified Mesoporous Silica Aerogels with Cellulose-Guided Templates

“…It could be seen from Figure that the adsorption capacities of all SA-La-X gradually increased until saturation as the initial phosphate concentration increased. The isotherm data were fitted according to Langmuir and Freundlich models, respectively . The obtained relevant parameters (listed in Table ) were analyzed to get the most appropriate fitting model.…”

Efficacy of La3+ entrapped chitosan bio‐polymeric matrix for the recovery of oil from oil‐in‐water emulsion

“…Frequently, clays, chelating resins, mesoporous silica materials, activated carbon fibers, biopolymers like chitosan, etc., have been found to be a useful medium for loading/doping of lanthanum. A wide range of literature survey has been made regarding the removal of various toxic ions such as fluoride, phosphate, and a few heavy metals using lanthanum based sorbents and is shown in Table . But, while seeking literature regarding oil removal using lanthanum loaded sorbents, only a report on desulfurization of diesel fuel by lanthanum loaded mesoporous MCM‐41 was found .…”