Investigating Methylene Blue Removal from Aqueous Solution by 2 Cysteine Functionalized Mesoporous Silica
Beagan, Abeer M . 2020
In this study, mesoporous silica nanoparticles (MSNs) were synthesised using the Stober 9 method, and functionalised with cysteine (MSN-Cys) for removal of Methylene Blue (MB) 10 from aqueous solution using the batch method. The adsorbent nanoparticles were 11 characterised by Scanning Electron Microscopy (SEM), Transmission Electron Microscopy 12 (TEM), FTIR, BET and TGA. Several influential factors on the adsorption of MB onto the 13 surface of MSN-Cys particles were investigated, including pH, initial concentration, and 14 contact time. The adsorption capacity of MB from aqueous solution increased from circa 70 15 mg/g MSN-Cys in acidic media to circa 140 mg/g MSN-Cys in basic media. Adsorption 16 isotherms and kinetic models of adsorption were used to clarify the adsorption process. The 17 measured adsorption isotherm was fitted with a Freundlich model for all solutions, and the 18 kinetic model was determined to be pseudo second-order.
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