New Trend for Acceleration Solid Phase Extraction Process Based on Using Magnetic Nano-adsorbents along with Surface Functionalization through Microwave Assisted Solvent-free Technique

Abstract

The use of a microwave assisted solvent-free technique for silica coating of iron magnetic nanoparticles (Fe3O4-MNPs) and their functionalization with three aliphatic diamines: 1,2-ethylenediamine (1,2EDA), 1,5-pentanediamine (1,5PDA) and 1.8-octanediamine (1,8-ODA), were successfully achieved in a very short time. Only 60 min were needed for the nano-adsorbent modification as compared with more than 1000 min using conventional methods under reflux conditions. Their surface characteristics (observed by TEM, XRD and FT-IR), in addition to Cu(II) adsorption capacities (1.805, 1.928 and 2.116 mmol g -1 ) and time of equilibration (5 s) were almost the same. Thus, the time required to accomplish the solid phase extraction process is greatly reduced. On the other hand, the phenomenon of the fast equilibration kinetics was successfully extended on using the functionalized aliphatic diamines magnetic nano-adsorbents as precursors for further microwave treatment. Three selective magnetic nano-adsorbents (Fe3O4-MNPs-SiO2-1,2EDA-3FSA, Fe3O4-MNPs-SiO2-1,5PDA-3FSA and Fe3O4-MNPs-SiO2-1,8ODA-3FSA) were obtained via the reaction with 3-formayl salicylic acid (3FSA) as a selective reagent for Fe(III). At 5 s contact time, they exhibited maximum Fe(III) uptake equal to 4.512, 4.987 and 5.367 mmol g -1 , respectively. Furthermore, modeling of values of metal uptake capacity obtained at different shaking time intervals supports pseudo-second order kinetics.

Microwave‐enforced green synthesis of novel magnetic nano composite adsorbents based on functionalization of wood sawdust for fast removal of calcium hardness from water samples

“…These results were further proved by correlating values of uptake capacities as a function of time as shown in Figure 8. Moreover, the exponentially fast removal of Ca(II) ions strongly reflects the Nanometrical particle size range (28.2-34.6 and 16.8-18.8 nm) for WSD@Fe 3 O 4 NPs-TA and WSD@Fe 3 O 4 NPs-CA, respectively, on acceleration of Ca(II) uptake in agreement with recent study (Ahmed & Soliman, 2015). .…”

“…Moreover, another crucial developing represents by the use of adsorbents of nanoparticle size (Khalil, Eljamal, Amen, Sugihara, & Matsunaga, 2017) as alternative to micro-particle ones, leading to maximizing surface area along with accelerating metal ion uptake. Usually, these nanoadsorbents incorporate a core of magnetic nanoparticles, especially Fe 3 O 4 to facilitate separation under external magnetic field (Ahmed & Soliman, 2015;Kumar, Barakat, & Soliman, 2014).…”

“…In this context, this manuscript aims to keep up with this recent development and to bridge the gap regarding calcium hardness removal utilizing magnetic nanoadsorbents especially of natural polymeric lignocellulosic origin. This is in addition to make use of the benefits of solvent-less microwave radiation technique for adsorbent synthesis and functionalization (Ahmed & Soliman, 2015). To achieve this goal, two novel magnetic nanoadsorbents WSD@Fe 3 O 4 NPs-TA and WSD@ Fe 3 O 4 NPs-CA were synthesized by grafting two safe organic modifiers TA and CA onto the presynthesized WSD@Fe 3 O 4 NPs via strong amide linkage.…”

Adsorptive removal of oil spill from sea water surface using magnetic wood sawdust as a novel nano-composite synthesized via microwave approach

“…A novel environmentally friendly green biocompatible nano composite (WSD@Fe 3 O 4 MNPs/SA) with superior oil sorption performance was successfully synthesized using solvent-less microwave approach. In addition to the well-known benefits (vis., safe, simple and time saving), of using this technique as a tool in surface modification [47], Its use for the preparation of the precursor WSD@Fe 3 O 4 MNPs enables fast and proper mixing of selected mass ratios of WSD and Fe 3 O 4 MNPs to attain the highest oil removal value. This represent an advantage over the conventional co-precipitation method, where the iron species present in solution mixture is allowed to be precipitated over the solid substrate required to be magnetized.…”

Microwave-assisted Derivatization of Fatty Acids for Its Measurement in Milk Using High-Performance Liquid Chromatography

“…30 Microwave irradiation has been reported to be useful in wide varieties of laboratory techniques. 31,32 Microwave heating has been successfully used in wide varieties of derivatization techniques for quantitative analysis. 30,[33][34][35] MAD has become a part of routine operating procedures in many laboratories, and been used in the GC/MS analysis of steroids, 34,36 phenolic acids, 37,38 fatty acids, 39,40 and urinary metabolites.…”