Preparation of a magnetic nanopartical based on amino modification and its application in removing glyceraldehyde

To remove a small amount of glyceraldehyde from glycerol efficiently and conveniently, a tailored magnetic nanopartical of Fe 3 O 4 @SiO 2 -NH 2 is prepared by sol-gel and dehydration condensation methods. The structural, morphological, and magnetic properties of adsorbent have been characterized by XRD, FTIR, SEM, VSM and BET. The influence of contact time, adsorbent dosage, initial concentration and reaction temperature on the removing of glyceraldehyde have been investigated. Batch adsorption experiments indicate that the removal rate of glyceraldehyde is ∼80 %, with the initial concentration of 10 mg/L, and adsorbent dosage of 3.5 g/L at 80 ℃. Meanwhile, the adsorption process is in accordance with the pseudo-second-order adsorption kinetics and the Langmuir adsorption isotherm model. Thermodynamic data indicate that this adsorption is endothermic and non-spontaneous. Importantly, the composites can be used for glyceraldehyde removal from three glycerol products from the market, with the removal rates of 83.76 % (Reagent), 85.01 % (Quan Rui) and 82.48 % (Sinopharm), respectively. Finally, the adsorption mechanisms are explored by pH experimental evidence and XRD, FTIR analysis, which show that mainly involve hydrogen bonding, aldehyde-amine condensation reaction, and non-specific surface physical adsorption. All the results can provide new idea for improving the high value of chemical products and reducing the small amount of harmful impurities in glycerol.