Removal of radionuclide Sr2+ ions from aqueous solution using synthesized magnetic chitosan beads

Chen, Yuwei; Wang, Jianlong

doi:10.1016/j.nucengdes.2011.10.059

Cited by 172 publications

(45 citation statements)

References 38 publications

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“…Transmission Electron Microscopy (TEM) images of these nanocomposites revealed spherical aggregates containing Fe 3 O 4 nanoparticles with sizes ranging 8-15 nm [79]. Magnetic iron-oxide nanoparticles have also been synthesized by in situ co-precipitation in the presence of other biopolymers such as carrageenan [57], chitosan [100,14] and chitin/alginate [50]. Carrageenans, which are sulfated polysaccharides, were employed as stabilizers in the synthesis of magnetite nanoparticles via co-precipitation of ferric and ferrous ions and subsequent biopolymer cross-linking with K + ions [57], see Fig.…”

Section: Magnetic Bionanocompositesmentioning

confidence: 99%

“…In another study, Chen et al prepared Fe 3 O 4 -chitosan macroscopic beads with spherical shape of approximately 1 mm diameter by the in situ co-precipitation of Fe 2+ and Fe 3+ in the presence of chitosan [14]. Similarly, magnetic chitin/alginate beads were prepared in situ by promoting ionic cross-linking between the oppositely charged biopolymer chains, leading to iron oxide nanoparticles (30 nm average) uniformly dispersed and immobilized in the polymer matrix [50].…”

Section: Magnetic Bionanocompositesmentioning

confidence: 99%

“…Table 4 lists the most representative isotherm and kinetic equations used for describing the adsorption of water pollutants. The Langmuir equation [47] derives from an isotherm model commonly applied to describe the equilibrium of sorption on magnetic bionanocomposites [60,40,81,102,14,104,59,98,94,26]. This empirical model assumes monolayer adsorption at a finite number of sites that are identical and equivalent, without any interaction between molecules adsorbed on adjacent sites.…”

Section: Modeling the Adsorption Processmentioning

confidence: 99%

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Bionanocomposites for Magnetic Removal of Water Pollutants

Sousa

Daniel‐da‐Silva

Silva

et al. 2015

Advanced Structured Materials

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Magnetic separation in water remediation processes is of great interest in current environmental technologies. An important aspect in this field has been the development of efficient sorbents for water purification units, namely by exploiting other functionalities that might originate more sustainable technologies. This chapter describes the state-of-art on the chemical preparation of magnetic sorbents comprising inorganic particles and biopolymer matrices. Fundamental aspects related to nanoparticle synthesis of iron oxides and nanomagnetism will be first addressed. The use of these particles in biopolymers matrices such as polysaccharides will be then reviewed as an innovative strategy aiming at production of eco-friendly sorbents for magnetic separation.

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Section: Magnetic Bionanocompositesmentioning

confidence: 99%

Section: Magnetic Bionanocompositesmentioning

confidence: 99%

Section: Modeling the Adsorption Processmentioning

confidence: 99%

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Bionanocomposites for Magnetic Removal of Water Pollutants

Sousa

Daniel‐da‐Silva

Silva

et al. 2015

Advanced Structured Materials

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“…To eliminate their risk to environment and the human health, the concentration of radioisotopes should decrease to certain acceptable level before discharge. There are many methods for the removal of heavy metal ions from aqueous solution, such as precipitation [7], biosorption [8][9][10], membrane separation [11], and so on. Among them, biosorption has received increasing attention in recent years due to its low cost and high efficiency for the removal of heavy metal ions form water and wastewater [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Modified alginate beads as biosensor and biosorbent for simultaneous detection and removal of cobalt ions from aqueous solution

Zhuang

Wang

2017

Env Prog and Sustain Energy

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A novel biomaterial was prepared to simultaneously detect and remove cobalt ions from aqueous solution by modifying alginate (AG) polymer with a high selectivity and sensitive indicator for Co , the color of the modified AG beads changed from yellow to pink, resulting in a noticeable change, which can be observed by naked eyes. The adsorption of Co 21 by the modified AG beads can be described by pseudo second-order kinetic model and the Freundlich isotherm model. The AG bead modified with an indicator is a promising biosensor and biosorbent for simultaneous detection and removal of cobalt ions from aqueous solution.

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“…Studies on heavy metals and organic compounds removal from wastewaters using different natural and synthetic materials are many. The important role of FTIR spectroscopy in such studies is either related to the characterization of sorbents, chemical modified sorbents, or to Advanced Aspects of Spectroscopy 56 establish the mechanism involved in sorption processes (Cheng et al, 2012;Chen and Wang, 2012;Xu et al, 2012;Ma et al, 2012a;Wang et al, 2011;Jordan et al, 2011;Bardakçi and Bahçeli, 2010;Pokrovsky et al, 2008;Parolo et al, 2008).Biosorption is considered as an alternative process for the removal of heavy metals, metalloid species, compounds and particles from aqueous solution by biological materials (Mungasavalli et al, 2007). Biomaterials are adsorbent materials with high heavy metals adsorption capacity.…”

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confidence: 99%

Application of FTIR Spectroscopy in Environmental Studies

Simonescu¹

2012

Advanced Aspects of Spectroscopy

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Figure 1. Schematic representation of the electromagnetic spectrum (adapted from http://www2.chemistry.msu.edu/faculty/reusch/VirtTxtJml/Spectrpy/UV-Vis/spectrum)? Advanced Aspects of Spectroscopy 50Infrared radiation is divided into:near (NIR, ν = 10,000 -4,000 cm -1 ); -middle (MIR, ν = 4,000 -200 cm -1 ) and -far (FIR, ν = 200 -10 cm -1 ).Because all compounds show characteristic absorption/emission in the IR spectral region and based on this property they can be analyzed both quantitatively and qualitatively using FT-IR spectroscopy.Today FT-IR instruments are digitalized and are faster and more sensitive than the older ones. FT-IR spectrometers can detect over a hundred volatile organic compounds (VOC) emitted from industrial and biogenic sources. Gas concentrations in stratosphere and troposphere were determined using FT-IR spectrometers (Puckrin et al., 1996).In case of environmental studies FTIR Spectroscopy is used to analyze relevant amount of compositional and structural information concerning environmental samples (Grube et al., 2008). The analysis can be performed also to determine the nature of pollutants, but also to determine the bonding mechanism in case of pollutants removal by sorption processes. Techniques for measuring gas pollutants such as continuous air pollutants analyzer (SO2, NO2, O3, NH3), on-line gas chromatography (GC) used simple real-time instruments to quantify gas pollutants. They need to use several sensors in order to analyze multiple gas pollutants simultaneously.FT-IR spectroscopy coupled with other spectroscopic techniques such as AAS (atomic absorption spectroscopy) have been used to assess the impact of industrial and natural activities on air quality (Kumar et al., 2005;Childers et al., 2001).In addition to the traditional transmission FTIR (T-FTIR) methods (e.g. KBr-pellet or mull techniques), modern reflectance techniques are widely used today in environmental, agricultural, pharmaceuticals, and food studies. These modern techniques are attenuated total reflection FTIR (ATR-FTIR), and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). The choice of the method to be used depends on many factors such as: the information needed (bulk versus surface analysis), the physical form of the sample, the time required for sample preparation (Majedová et al., 2003).In the following there will be presented some of the most important research studies related to the involvement of FTIR spectroscopy in environmental studies. Traditional transmission FT-IR (T-FTIR) spectroscopy in environmental studiesTransmission spectroscopy is the oldest and most commonly used method for identifying either organic or inorganic chemicals providing specific information on molecular structure, chemical bonding and molecular environment. It can be applied to study solids, liquids or gaseous samples being a powerful tool for qualitative and quantitative studies. Application of FTIR Spectroscopy in Environmental Studies 51FTIR instrument's principle of function is the following: IR radi...

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Removal of radionuclide Sr2+ ions from aqueous solution using synthesized magnetic chitosan beads

Cited by 172 publications

References 38 publications

Bionanocomposites for Magnetic Removal of Water Pollutants

Bionanocomposites for Magnetic Removal of Water Pollutants

Modified alginate beads as biosensor and biosorbent for simultaneous detection and removal of cobalt ions from aqueous solution

Application of FTIR Spectroscopy in Environmental Studies

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