Magnetic Nanocomposite Adsorbent Research Articles

FeCl2/FeCl3 Perlite Nanoparticles as a Novel Magnetic Material for Adsorption of Green Malachite Dye

In this research FeCl2/FeCl3/Perlite magnetic nanoparticles (FeCl2/FeCl3/PMNs), as a novel magnetic nanocomposite adsorbent was used for the removal of green malachite (GM) dye from aqueous solution in a batch and fixed bed column. Firstly, FeCl2/FeCl3/PMNs adsorption properties were investigated. Therefore, the solution of FeCl2·4H2O and FeCl3·6H2O by ratio 2/1 was mixed with perlite nanoparticles. The study investigates the effect of process parameters such as pH, adsorbent dosage, contact time and GM dye initial concentration. Next, GM dye was quantitatively evaluated by using the Langmuir, Freundlich and BET isotherms and pseudo-first- and pseudo-second-order kinetic model. The adsorption data follow the adsorption equilibrium was well described by the BET isotherm model with maximum adsorption capacity of 0.01 mg/g of GM dye on FeCl2/FeCl3/PMNs. The results of fixed-bed column show that 6, 8 and 10 mL/min flow rates of the breakthrough curve were saturated at 150, 299 and 440 min, respectively. The results of SEM and AFM analysis show that particle size is less than 100 nm. Also, the BET analysis shows that the surface areas for the FeCl2/FeCl3/PMNs and raw perlite are 99 and 3.5m2/g, respectively. The results show that adsorption capacities and removal percentage of GM dye on FeCl2/FeCl3/PMNs from wastewaters is about 77 %. Consequently, FeCl2/FeCl3/PMNs is a superior adsorbent for wastewaters purification.

Extraction of Phthalate Esters in Environmental Water Samples Using Layered-Carbon Magnetic Hybrid Material as Adsorbent Followed by Their Determination with HPLC

) hybrid material was synthesized through a facile one-potsolvothermal method and used as the adsorbent for the preconcentration of some phthalate esters (dimethylphthalate, diethyl phthalate, diallyl phthalate, diisobutyl phthalate and benzyl butyl phthalate) in water samples.The effects of the adsorbent dosage, extraction time, the solution pH and salinity on the adsorption of thephthalate esters (PAEs) were investigated. The magnetic nanocomposite adsorbent could remove and enrichthe PAEs from water samples efficiently. After the adsorption, the analytes were desorbed and then determinedby high performance liquid chromatography-ultraviolet detection. Under the optimum conditions, theenrichment factors of the method for the analytes were in the range from 161 to 180. A linear response withpeak area as the quantification signal was observed in the concentration range from 0.5 to 100 ng mL

Copper (II) removal by pectin–iron oxide magnetic nanocomposite adsorbent

This study describes an effective copper removal method using pectin-coated iron oxide magnetic nanocomposite as an adsorbent. The nanocomposite adsorbent was synthesized with the iron salt co-precipitation method followed by direct encapsulation with pectin coating without cross linking with calcium ions. Scanning electron microscopy (SEM) images showed pectin–iron oxide magnetic nanocomposite (PIOMN) adsorbent was spherical in shape and 77±5nm in diameter. Fourier transform infrared spectroscopy (FTIR) spectra provided the evidence that pectin was successfully coated on the surface of iron oxide nanoparticle. The interaction between copper ions and pectin on PIOMN surface was elucidated from energy dispersive analysis system of X-ray (EDAX) spectra. The amount of adsorbed Cu(II) by PIOMN adsorbent increased with increasing pH, followed by decreased pH value after copper uptake, attesting to the ion exchange and electrostatic force mechanism during the adsorption process. Sorption kinetic data were well fitted with a pseudo second-order model, and sorption isotherms were described by both Langmuir and Freundlich equation with maximum adsorption capacity of 48.99mg/g. Furthermore, the adsorbents can be regenerated using 0.01M EDTA, remaining 93.70% of its original capacity after the first regeneration cycle, and still reaching 58.66% of the original capacity after the fifth cycle.

Looped carbon capturing and environmental remediation: case study of magnetic polypropylene nanocomposites

A waste-free process to recycle Fe@Fe2O3/polypropylene (PP) polymer nanocomposites (PNCs) is introduced to synthesize magnetic carbon nanocomposites (MCNCs) and simultaneously produce useful chemical species which can be utilized as a feedstock in petrochemical industry. The magnetic nanoparticles (NPs) are found to have an effective catalytic activity on the pyrolysis of PP. The PNCs (with a NP loading of 20.0 wt%) undergo a complete degradation with 2 h pyrolysis at 500 °C in a H2/Ar atmosphere and the degradation components exhibit a distribution of species with different numbers of carbon, while only 40% of pure PP is decomposed after applying the same pyrolytic conditions. The coked solid waste from the conventional process has been utilized as a carbon source to form a protective carbon shell surrounding the magnetic NPs. The magnetic carbon nanocomposites (MCNCs) pyrolyzed from PNCs containing 20.0 wt% NPs demonstrate extremely fast Cr(VI) removal from wastewater with the almost complete removal of Cr(VI) within 10 min. The pH effect on the Cr(VI) removal efficiency is investigated with a preferable value of 1–3. The adsorbent exhibits much higher adsorption capacity in acidic solutions than that in alkali solutions. The large saturation magnetization (32.5 emu g−1) of these novel magnetic carbon nanocomposites allows fast recycling of both the adsorbents and the adsorbed Cr(VI) from the liquid suspension in a more energetically and economically sustainable way by simply applying a permanent magnet. The significantly reduced treatment time required to remove the Cr(VI) makes these MCNCs promising for the efficient removal of the heavy metals from wastewater. Kinetic investigation reveals the pseudo-second-order adsorption of Cr(VI) on these novel magnetic carbon nanocomposite adsorbents.

Preparation of a graphene-based magnetic nanocomposite for the removal of an organic dye from aqueous solution

A graphene-based magnetic nanocomposite was synthesized and used as an adsorbent for the removal of a dye from aqueous solutions. The morphology and inner structure of the magnetic adsorbent were characterized by both scanning electron microscopy and X-ray diffraction. The adsorption characteristics of the graphene magnetic nanocomposite adsorbent were examined using an organic dye fuchsine as the adsorbate. The adsorption kinetics, adsorption capacity of the adsorbent, and the effect of the adsorbent dosage and solution pH on the removal efficiency of fuchsine were investigated. Freundlich model and Langmuir model were used to study the adsorption isotherms. The resultant kinetic data were well fitted by a pseudo second-order model. The graphene magnetic nanocomposite proved to be a highly efficient adsorbent and could be easily used for separation purposes.