Abstract
Herein, two novel porous polymer matrix nanocomposites were synthesized and used as adsorbents for heavy metal uptake. Methacrylate-modified large mesoporous silica FDU-12 was incorporated in poly(methyl methacrylate) matrix through an in-situ polymerization approach. For another, amine-modified FDU-12 was composited with Nylon 6,6 via a facile solution blending protocol. Various characterization techniques including small-angle X-ray scattering, FTIR spectroscopy, field emission-scanning electron microscopy, transmission electron microscopy, porosimetry, and thermogravimetric analysis have been applied to investigate the physical and chemical properties of the prepared materials. The adsorption of Pb(II) onto the synthesized nanocomposites was studied in a batch system. After study the effect of solution pH, adsorbent amount, contact time, and initial concentration of metal ion on the adsorption process, kinetic studies were also conducted. For both adsorbents, the Langmuir and pseudo-second-order models were found to be the best fit to predict isotherm and kinetics of adsorption. Based on the Langmuir model, maximum adsorption capacities of 105.3 and 109.9 mg g−1 were obtained for methacrylate-modified FDU-12/poly(methyl methacrylate) and amine-modified FDU-12/Nylon 6,6, respectively.
Highlights
Mixed by agitation followed by evaporation of the solvent and composite film casting
The prepared sample exhibits some characteristic peaks especially at 2θ below 0.5. This pattern is similar to that of FDU-12 reported in the literature indicating the successful synthesis of ordered FDU-12 mesoporous s ilica[36,47,48,53,54]
In the pristine FDU-12 spectrum (Fig. 2a), the bands at [463, 810], and 1078 cm−1 are attributed to the Si–O–Si vibrations which are in agreement with previous reports[33,34,55]
Summary
Mixed by agitation (magnetic stirring, sonication, etc.) followed by evaporation of the solvent and composite film casting. To expand the applicability of mesoporous silica materials (e.g., FDU-12) and applying them as nanofiller in the polymer nanocomposites, their hydrophobicity and surface characteristics should be changed to enhance the compatibility of the nanofiller and polymer matrix. In this case, the incorporation of organic functional groups onto the ordered structure of the mesoporous silica materials seems to be a good choice. Due to the presence of a large number of hydroxyl groups on the surface of mesoporous silica materials, surface functionalization with a variety of organic moieties seems to be relatively e asy[47] In this case, there are few reports regarding the functionalization of mesoporous silica FDU-1248–52. The prepared nanocomposites were applied as new adsorbents for Pb(II) uptake from aqueous solutions
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
