Highly Efficient Removal of Silver-Containing Nanoparticles in Waters by Aged Iron Oxide Magnetic Particles (original) (raw)
Related papers
, Kotl a rsk a 2, 611 37 Brno, Czech Republic d CEPLANT, R&D Center for Low-Cost Plasma and Nanotechnology Surface Modifications, Masaryk University, Kotl a rsk a 2, 611 37 Brno, Czech Republic This study investigates the removal of AgNP colloids by Cu-(BTC) MOFs. Adsorption of AgNP on HKUST-1 was very fast and followed Freundlich isotherm. The efficient and complete removal of AgNP was affected by the type of water. SEM and EDX analysis showed that AgNP were adsorbed onto the MOFs. Very low amount of HKUST-1 (10 mg) are necessary to perform adequate adsorption of AgNP the range of environmental levels. a b s t r a c t Silver nanoparticles (AgNP) are emerging pollutants. The use of novel materials such as Cu-(benzene 1,3,5-tricarboxylate, BTC) Metal-Organic Framework (MOFs), for AgNP adsorption and their removal from aqueous solutions has been studied. The effect of different parameters was followed and isotherm model was suggested. MOFs adsorbed fast and efficiently AgNP in the range C 0 < 10 mg L À1 , being Freundlich isotherm (R ¼ 0.993) these data fitted to. Among studied parameters a remarkable effect of chloride on sorption was found, thus their possible interactions were considered. The high adsorption efficiency of AgNP was achieved and it was found to be very fast. The feasibility of adsorption on Cu-(BTC) was proved in spiked waters. The results showed the potential interest of new material as adsorbent for removing AgNP from environment.
Scientific reports, 2018
The current status of silver nanoparticles (AgNPs) in the water environment in Malaysia was examined and reported. For inspection, two rivers and two sewage treatment plants (STPs) were selected. Two activated carbons derived from oil palm (ACfOPS) and coconut (ACfCS) shells were proposed as the adsorbent to remove AgNPs. It was found that the concentrations of AgNPs in the rivers and STPs are in the ranges of 0.13 to 10.16 mg L-1 and 0.13 to 20.02 mg L-1, respectively, with the highest concentration measured in July. ACfOPS and ACfCS removed up to 99.6 and 99.9% of AgNPs, respectively, from the water. The interaction mechanism between AgNPs and the activated carbon surface employed in this work was mainly the electrostatic force interaction via binding Ag+ with O- presented in the activated carbon to form AgO. Fifteen kinetic models were compared statistically to describe the removal of AgNPs. It was found that the experimental adsorption data can be best described using the mixed ...
Journal of Molecular Liquids, 2017
The focus of the present work is on exploiting the excellent structural properties of the nanomaterials. More specifically, it is demonstrated that Ag nanoparticles (AgNPLs) chemically immobilised onto activated carbon (AC-AgNPLs) can act as an effective solid sorbent for removal and/or minimisation of selected crystal violet (CV) dye from aqueous solutions by conducting experiments on water samples. Spectroscopic tools such as FTIR, SEM, TEM and XRD were used in the characterisation of the adsorbent before and after adsorption. The adsorbent dose, pH, contact time, rotation velocity, initial concentration of adsorbate and the temperature effects were examined to evaluate their role in the percentage elimination of crystal violet. Crystal violet uptake was favourable in alkaline media at pH N 7.0, while the Langmuir model revealed CV monolayer adsorption capacity of 87.2 mg/g. The pseudo second-order model fitted the data well and the thermodynamic parameters (ΔH, ΔS, and ΔG) of CV retention revealed that the uptake is endothermic and spontaneous in nature. When AC-AgNPLs was utilised, it removed a greater CV percentage from aqueous solution relative to AC. The mechanism of adsorption was explored using the intra-particle diffusion model and the liquid-film model. Desorption studies were made to elucidate recovery of the adsorbate and adsorbent for the economic competitiveness of the removal system. The AC-AgNPLs was successfully recycled for seven successive adsorption-desorption cycles indicating its high reusability.
Nanotechnology for Environmental Engineering, 2020
The present comprehensive review is an account of recent advances in the syntheses of nanoparticles of iron-based materials via conventional and green routes and their adoptability as adsorbents in the purification of water. The green synthesized nanoparticles are proving to be more biocompatible with enhanced sorption properties than conventionally synthesized nanoparticles. The potential areas of research in the syntheses and application aspects are summarized. The identification of compounds in flora that serve as reducing, capping or stabilizing agents, production of uniform-sized nanoparticles using plat materials as 'biotemplates' and developing sorption affinity between the surface of nanoiron-based particles and pollutants are some of the important areas discussed. The redox, complex formation, adsorption and ion-exchange tendencies of iron nanoparticles may be suitably 'tailor-made' to improve their binding affinity towards the pollutants so that the said nanoparticles or their composite materials (especially bi-/multimetallic/mixed oxides) may be used as adsorbents in water remediation methods. One of the major inherent disadvantages of nanosized iron particles using as adsorbents is the rate of percolation water through the sorbent bed is low, and there is a loss of pressure head. Investigations are to be focused in developing open columns wherein nanoparticles are embedded in the matrix of synthetic or natural inorganic or organic polymers or in beads. In such cases, the host matrix may influence the characteristics of the nanoparticles and they are to be investigated for the advantage of removal of pollutants from wastewater.
Journal of Environmental Health Science and Engineering, 2013
The impact of effective parameters such as iron oxide nanoparticles dosage, contact time and solution pH was optimized for removal of Ag(I) and Ni(II) in the nuclear cooling system and the best conditions were compared. Nearly complete removal (97%) of Ni(II) and Ag(I) were obtained at adsorbent dosage of 40 and 20 g/L, respectively. Experiments showed that 4 hours was a good choice as optimum contact time for two ions removal. The effective parameter was pH, so that maximum removal efficiency was obtained for Ag(I) in acidic pH=3 and for Ni(II) in basic pH=10. It seems that removal of Ag(I) was controlled by adsorption-reduction mechanism, but Ni(II) could place only adsorption. Langmuir and Freundlich model was more suitable for nickel and silver removal by this adsorbent, respectively. Ag(I) and Ni(II) removal efficiency trend by this adsorbent is similar at periods but different in the concentrations, pHs and equilibrium model. The obtained results were very promising, as both A...
Journal of Nanoparticle Research, 2014
The present research was conducted with an aim to develop such adsorbent system: polymercoated magnetic nanoparticles which can remove heavy metal and dye from water of different concentration. Synthesis of magnetic iron oxide nanoparticles for contaminated water purification has been one of the outcomes of application of rapidly growing field of Nanotechnology in Environmental Science. In the present study, the efficiency of magnetic nanoparticles for removal of Cr(VI) and dye (alizarin) from water solutions of known concentrations were evaluated. The nanoparticles were prepared by co-precipitation method and characterized by X-ray photoelectron spectroscopy, transmission electron microscopy, and Fourier transform infrared spectroscopy. Polymercoated magnetic iron oxide nanoparticles carrying functional groups on their surface were synthesized by different methods for permanent magnet-assisted removal of heavy metal (chromium) and dye (Alizarin Red S) from water. The characterization showed that synthesized nanoparticles were in the size range of 10-50 nm. The adsorption capacities of the Fe 3 O 4 using polyMETAC-coated particles for dye (Alizarin Red S) removal were 80-96 % and chromium 62-91 %. The chromium concentration was determined after magnetic separation using atomic absorption spectrophotometer and dye concentration was estimated with UV-visible spectrophotometer. Nanoparticles of polymer coated showed the highest removal capacity from water for metal and dye. The developed adsorbents had higher capacity for removal of heavy metal ions and dye. Keywords Chromium Á Dye alizarin Á X-ray photoelectron spectroscopy (XPS) Á Transmission electron microscopy (TEM) Á Atomic absorption spectrophotometer (AAS) and Fourier transform infrared (FTIR) spectroscopy Á Adsorbtion Á Heavy metal removal Á Drinking water Á Environmental effects
Advances in environmental science and technology, 2018
The present work focuses on the synthesis and application of imine-modified silica-coated magnetic (IM-SCM) nanoparticles. The X-ray diffraction (XRD) tests indicated the presence of highly crystalline cubic spinel magnetite both before and after coating with the silica. The FTIR spectra also proved the successful surface coating and imine-modification of the Fe3O4 nanoparticles. Further investigations were performed to examine the capability of the modified IM-SCM nanoparticles for simultaneous removal of Ag+ and Cu2+ from the water samples. Atomic absorption spectrometry was used for ion determination. The best operating conditions for removing the target ions were a pH=5-9 and a stirring time=30 min. Only 20 mL of 3M nitric acid was used for stripping the ions using the IM-SCM nanoparticles. The resulting data were found to fit well with the Langmuir model, and the maximum capacity of the adsorbent was determined to be 270.3 (± 1.4) mg and 256.4 (± 0.9) mg of Ag+ and Cu2+ /g of I...