PES/SiO2 nanocomposite by in situ polymerization: Synthesis, structure, properties, and new applications (original) (raw)
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In order to elaborate composites for the retention of Cu(II) from aqueous solution, colloidal silica particles were functionalized in two ways, grafting with carboxylic functions SiO 2 (CO 2 H) and encapsulation with chitosan (CS + SiO 2 ) and N-carboxylated carboxymethyl-chitosan (CM-CS+SiO 2 ). The adsorption isotherms were studied using Freundlich, Langmuir, Tempkin and Sips isotherm models. The maximum uptake capacity for Cu(II) was obtained with N-carboxylated carboxymethyl-chitosan (172.4 mg g À1 ).
Polymer Bulletin, 2019
This study reports the adsorption of Cu(II) ion by 3-(2-aminoethylamino) propyldimethoxymethylsilane-modified terpolymers. Water-soluble poly(sodium 4-styrenesulfonate-co-maleic anhydride-co-acrylamide) [poly(NaSS-coMA co -AAm)] and poly(sodium 4-styrenesulfonate-co-maleic anhydride-coN -isopropylacrylamide) [poly(NaSS-coMA co -NIPAM)] terpolymers were synthesized and then modified with silane to make them water-insoluble. 1 H-NMR and FT-IR spectroscopy was used to study the chemical composition of the terpolymers. Also, acid number and viscosity of the polymers were determined. Cu(II) ion adsorption parameters (adsorbent dosage, contact time, pH and metal ion concentration) were studied, and the equilibrium data were evaluated using adsorption isotherm models; Freundlich isotherm gave the best fit. Cu(II) adsorption performance of poly(NaSSco-MA-co-AAm) and poly(NaSS-coMA co -NIPAM) terpolymers was found to be 53.42 and 43.10%, respectively. The terpolymers can be used for removal of Cu(II) from aqueous media.
Journal of Molecular Liquids, 2017
Amino functional poly propyleneimine (PPI, G5) dendrimer linked silica (PPI/SiO 2) was synthesized with a divergent procedure. PPI/SiO 2 nanohybrid was analyzed by XRD, FTIR, TGA, BET, Zeta potential, TEM and SEM. The above analysis was applied to determine good grafting between PPI and SiO 2. The adsorption performance of the PPI/SiO 2 nanohybrid for the uptake of Pb 2+ , Ni 2+ ,Cu 2+ , and Co 2+ metal ions was monitored under the efficacy of nanohybrid dosage, metal ion concentration, contact time, solution pH, and regeneration. The outputs of the investigation showed high removal efficiency and great desorption performance. The isotherms, kinetics and thermodynamics of Pb 2+ , Ni 2+ , Cu 2+ , and Co 2+ metal ions uptake by the PPI/SiO 2 were evaluated. The results revealed that the highest adsorption capacity of Pb 2+ , Ni 2+ , Cu 2+ , and Co 2+ onto PPI/SiO 2 was 700, 800, 900 and 1000 mg/g at 298 K pursuant to an analysis using the Langmuir model that was coordinated very good to the sorption data. The outputs of the kinetic
Journal of Environmental Chemical Engineering, 2016
Large surface area, high porosity and good mechanical strength are some of the attributes of the polymer-inorganic hybrid materials those make these attractive candidates for use as adsorbents. New silica/titania-based polymer-inorganic hybrid material was synthesized via the sol-gel process. While SiO 2 and TiO 2 were used as the inorganic components, poly(2-Hydroxypropyl methacrylate) was used as the polymeric component. The material was well characterized by FTIR, SEM, TEM and BET. The synthesized hybrid material was used as adsorbent for the removal of Cu(II) ions from their aqueous solutions. Parametric study of the factors affecting adsorption was carried out to find the optimum adsorption conditions. Different kinetic and isotherm models applied show that the adsorption best follows pseudo-second order kinetics and Langmuir isotherm. The maximum adsorption capacity of the HPMA/SiO 2 /TiO 2 hybrid material was found to be 192.23 mg g. À1 In order to see the validity of the experimental procedure and results obtained, artificial neuron network model was employed to predict the adsorption capacity values following the experimental adsorption parametric frame. There is a close agreement with the experimental and the predicted values as very high values of R 2 of 0.99957 and 0.99961 were obtained for the predicted vs. experimental values with training and testing data set.
Separation and Purification Technology, 2007
A resinous functionalized polymer, aniline formaldehyde condensate (AFC) coated on silica gel was used as an adsorbent to remove copper (Cu 2+) from aqueous solution under conditions of different initial Cu 2+ concentration, adsorbent loading, pH and adsorption time. Coordination bond formation between amine group and Cu 2+ ion was the main mechanism of copper removal. Adsorption increased from 20% at pH 4 to 71% at pH 6 due to less competition from proton. Adsorption equilibrium was achieved within 120-150 min. The kinetics of adsorption followed second order model with rate constant of 0.0021 g/mg min. The adsorption data gave good fit with Langmuir isotherm and yielded Langmuir monolayer isotherm uptake of 76.33 mg/g and adsorption equilibrium parameter of 0.022 L/mg at solution pH of 5.4-5.7 and temperature of 22-25 • C. During desorption studies 97-100% of adsorbed copper ion released in solution in presence of 1N strength of mineral acids HCl, H 2 SO 4 and HNO 3. Dynamic study shows that column breakthrough was achieved at 264 bed volume at initial Cu 2+ of 25 mg/L. Further studies are recommended on regeneration and reuse of AFC coated silica gel after desorption of copper ion.
Polymers, 2020
The paper presents an original study on adsorption and aggregation phenomena in a mixed system consisting of a macromolecular compound, heavy metal ions and an innovative adsorbent. The authors used ionic polyacrylamides (PAM), Cu(II) ions and carbon–silica composite (C-SiO2) in the experiments. Such a system has not yet been described in the literature and therefore, the article is of significant novelty and great importance. The composite was prepared by mixing phenol–formaldehyde resin with silica and pyrolysis at 800 °C. The adsorbed amounts of Cu(II) ions and PAM were determined spectrophotometrically. C-SiO2 was characterized using potentiometric titration, microelecrophoresis and Fourier Transform Infrared Spectroscopy (FTIR) analysis. In turn, the C-SiO2 aggregation was established turbidimetrically as well as using a particle size analyzer. The obtained results indicated that both Cu(II) ions and ionic polyacrylamide were adsorbed on the composite surface at pH 6. The highe...
J. Mater. Chem., 2012
Metal-organic-silica (MOS) nanocomposites of copper, silver nanoparticles, Cu 2+ , Ag 1+ , propyl ethylenediamine linker and silica gel (Cu-PEDA-S, Ag-PEDA-S, Cu 2+ -PEDA-S and Ag 1+ -PEDA-S) were prepared by surface chemical modifications. Silica surface was modified with propyl ethylenediamine functional groups (PEDA-S) followed by treatment with Cu 2+ and Ag 1+ solutions to produce metal ion-ethylenediamine-silica nanocomposites (Cu 2+ -PEDA-S and Ag 1+ -PEDA-S). Finally, the metal-organic-silica nanocomposites of Cu-PEDA-S and Ag-PEDA-S were formed by chemical reduction of the metal ion incorporating modified silica. The nanocomposites were characterized by CHN elemental analysis, FTIR, TGA, EDAX and transmission electron microscopy. The Cu 2+ ion composite provides active sites for chemisorptions of 3.0 wt% water due to Cu complex formation. The metal nanocomposites show a high dispersion of uniform Cu and Ag nanoparticles through the silica support with diameter range from 5 to 20 nm. Thermal gravimetric analysis shows the improvement of CO 2 adsorption stability in the MOS nanocomposites and Cu-PEDA-S has CO 2 adsorption capacity of 28% and 100% higher than that for the PEDA-S and Cu 2+ -PEDA-S nanocomposites, respectively. The preparation procedure is simple and favourable for the synthesis of a variety of metal-organic-silica nanocomposites for application as catalysts in greenhouse gas removal and capture.
Journal of the Brazilian Chemical Society
An organic-inorganic hybrid material based on a silica matrix and functionalized with imidazole group was successfully synthesized by the sol-gel process. The characterization techniques enabled the confirmation of the proposed structure as well as the effectiveness of the imidazole ring functionality in the structure of the material. It is insoluble in water and showed an anion exchange capacity of 2.944 mmol g-1 , an excellent capacity for the adsorption of metal ions according to the literature. Thus, the metal halides CuCl 2 , CdCl 2 and NiCl 2 were adsorbed by the modified silsesquioxane from aqueous solutions. The adsorption isotherms results showed the availability of 3-n-propylimidazolium silsesquioxane chloride (SiImi + Cl −) as an efficient adsorbent material in the adsorption of metal ions, exhibiting a higher affinity for the Cu 2+ ions at pH 4, with a maximum adsorption capacity of 2.80 mmol g-1. The Langmuir, Freundlich and Sips models were applied to the adsorption isotherms, both the pH and the nature of the ion were observed to be factors that influence the adjustment of the isotherms to the proposed models.
Water, 2022
The efficiency of Cu(II) removal from aqueous solution by two adsorbents, silica SBA-15 and titanosilicate ETS-10, was investigated. Effects of various experimental parameters such as: contact time, pH, initial copper concentration, adsorbent dosage, temperature were investigated in order to determine the maximum adsorption capacity of the adsorbents. The maximum adsorption capacity of silica SBA-15 was achieved at pH 5.0, and of titanosilicate ETS-10 at pH 6.0. The Freundlich, Langmuir, and Temkin isotherm models were applied in order to describe the equilibrium adsorption of Cu(II) by the studied adsorbents. Equilibrium data fitted well to the Langmuir model with a higher adsorption capacity of ETS-10 (172.53 mg·g−1) towards Cu(II) than SBA-15 (52.71 mg·g−1). Pseudo-first- and pseudo-second-order, Elovich, and Weber–Morris intraparticle diffusion models were used for description of the experimental kinetic data. It was found that the pseudo-first-order and pseudo-second-order kine...
Asia-Pacific Journal of Chemical Engineering, 2014
The poly(ethyleneimine) (PEI)-functionalized organic-inorganic hybrid silica was prepared by a hydrothermal-assisted surface grafting technique. Static adsorption experiment results showed that PEI-functionalized hybrid silica had high static adsorption capacity of 68.1 mg g À1 , which was 1.3 times as much as that of the sorbents by conventional heating method. PEI-functionalized hybrid silica displayed stable adsorption ability for Pb(II) ions in the range of pH 4-8. An equilibrium state was reached within 30 min. Freundlich and Langmuir adsorption isotherm models were used to fit the equilibrium data, and it was found that the Langmuir adsorption model provided good fit. Kinetic studies indicated that the adsorption followed a pseudo-second-order model. Various thermodynamic parameters, such as ΔG o , ΔH o and ΔS o , were evaluated with results indicating that this system was a spontaneous and endothermic process. The results indicated that PEIfunctionalized hybrid silica could be employed as an effective material for the adsorption of Pb(II) ions from aqueous solutions.