Construction of a double-layered polyelectrolyte-coated mesoporous silica containing residues of biogenic aspartic acid and its utilization for cadmium (II) removal
- 29 Downloads
Highly efficient porous adsorbent has been developed by simple and inexpensive surface modification of mesoporous SBA-15 via an alternate adsorption of cationic poly(diallyldimethylammonium ion) and anionic poly(diallylaspartate). The nature of the charge on the surface after modification was confirmed by Zeta potential measurement. The surface morphology, topography, and its textural properties were examined by atomic force microscopy (AFM) and Nitrogen adsorption/desorption, respectively. TGA has been performed to ascertain the amount of polymer layer on the silica material. Multi-parameter isotherm models were used for the analyses of experimental data. The new protocol is found to be very impressive in the removal of toxic Cd(II) pollutant with an experimental maximum uptake capacity of 160 mg g–1.
An aspartic acid-based polymer was immobilized on mesoporous silica SBA-15.
Modification of the silica surface was achieved via simple layer-by-layer deposition.
The biogenic amino acid residues imparted remarkable efficacy to remove Cd(II).
KeywordsWastewater treatment Cadmium(II) Adsorption SBA-15, aspartic acid Layer-by-Layer Mesoporous adsorption
This work was supported by King Abdulaziz City for Science and Technology (KACST) [project No. AR-32-99].
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
- 14.Mihai M, Schwarz S, Janke A, Ghiorghiţǎ CA, Drǎgan ES (2013) Silica microparticles surface coating by layer-by-layer or polyelectrolyte complex adsorption. J Polym Res 20: 89. https://doi.org/10.1007/s10965-013-0089-5.
- 20.HP B (1966) Chemical identification of surface groups. In: Eley, DD, Pines Herman WPB (eds) Advances in catalysis. Academic Press Inc., New York, pp. 179–274.Google Scholar
- 30.Jaroniec C, Gilpin R, Jaroniec M (1997) Adsorption and thermogravimetric studies of silica-based amide bonded phases. J Phys 44242:6861–6866.Google Scholar
- 31.Iler RK (1979) The chemistry of silica: solubility, polymerization, colloid and surface properties and biochemistry. John Wiley, New York.Google Scholar
- 35.Morris WJW, JC (1963) Intraparticle diffusion during the sorption of surfactants onto activated carbon. Eng Div Am Soc Civ Eng 89:31–60.Google Scholar
- 39.Lima EC, Adebayo MA, Machado FM (2015) In: Bergmann CP, Machado FM (eds.) Carbon nanomaterials as adsorbents for environmental and biological applications, Springer International Publishing, Switzerland, pp. 33–69.Google Scholar
- 40.U.S. Department of Health and Human Services (2016) 14th RoC Review of Cobalt and Cobalt Compounds that Release Cobalt Ions In Vivo, National Toxicology Program, https://ntp.niehs.nih.gov/pubhealth/roc/listings/cobalt/. Accessed 17 Jan 2019.