One-step synthesis of magnetic composites of cellulose@iron oxide nanoparticles for arsenic removal

Yu, Xiaolin; Tong, Shengrui; Ge, Maofa; Zuo, Junchao; Cao, Changyan; Song, Weiguo

doi:10.1039/c2ta00315e

Cited by 298 publications

(124 citation statements)

References 49 publications

(51 reference statements)

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“…the decrease of pH from 7 to 2. Similar trends of the effects of pH have commonly been observed with iron oxide-based adsorbents and can be explained by the changes in surface charge of the adsorbents and the arsenic speciation [7][8][9]12,[21][22][23][24]26,32,34,37,38]. Figure 9(b) shows the dependence of surface charge of FeO x -GO-80 on pH.…”

Section: Arsenic Adsorption With Feo X -Go Nanocompositessupporting

confidence: 58%

“…Though causing only a small reduction in the adsorption of As(III), PO 4 3-shows the expected most intense reduction in the adsorption of As(V). PO 4 3-is a known strong competing anion for arsenic adsorption and can strongly compete with arsenic for adsorption sites [26,32,34] Its effect can be explained by the similar tetrahedral structure formed by As(V), As(III), and phosphate [32]. Despite the excessive presence of the coexisting anions, these results confirm that the concentration of more toxic As(III) can be effectively removed with FeO x -GO-80 to the level (10 µg L -1 ) meeting the WHO guidelines for drinking water.…”

Section: Arsenic Adsorption With Feo X -Go Nanocompositesmentioning

confidence: 99%

“…Typical substrates include low-cost abundant ones, such as naturally occurring minerals [21], activated carbons [22], graphene oxide (GO) [23][24][25][26][27][28][29][30][31][32][33], and cellulose [34], as well as some specially synthesized costly ones, such as mesoporous carbons [35,36], carbon nanotubes [37], macroporous silica [38], etc. Such nanocomposite adsorbents facilitate their more convenient separation following adsorption.…”

Section: Introductionmentioning

confidence: 99%

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High-performance iron oxide–graphene oxide nanocomposite adsorbents for arsenic removal

Hmidi

2017

Colloids and Surfaces A: Physicochemical and Engineering Aspect

177

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We report the synthesis of a new range of iron oxide-graphene oxide (GO) nanocomposites having different iron oxide content (36-80 wt%) as high-performance adsorbents for arsenic removal. Synthesized by co-precipitation of iron oxide on GO sheets that are prepared by an improved Hummers method, the iron oxide in the nanocomposites is featured primarily in the desirable form of amorphous nanoparticles with an average size of ca. 5 nm. This unique amorphous nanoparticle morphology of the iron oxide beneficially endows the nanocomposites with high surface area (up to 341 m 2 g -1 for FeO x -GO-80 having the iron oxide content of 80 wt%) and predominant mesopore structures, and consequently increased adsorption sites and enhanced arsenic adsorption capacity. FeO x -GO-80 shows high maximum arsenic adsorption capacity (q max ) of 147 and 113 mg g −1 for As(III) and As(V), respectively. These values are the highest among all the iron oxide-GO/reduced GO composite adsorbents reported to date and are also comparable to the best values achieved with various sophisticatedly synthesized iron oxide nanostructures. More strikingly, FeO x -GO-80 is also demonstrated to nearly completely (>99.98%) removes arsenic by reducing the concentration from 118 (for As(III)) or 108 (for As(V)) to < 0.02 µg L −1 , which is far below the limit of 10 µg L −1 recommended by the World Health Organization (WHO) for drinking water. The excellent adsorption performance, along with their low cost and convenient synthesis, makes this range of adsorbents highly promising for commercial applications in drinking water purification and wastewater treatment.

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Section: Arsenic Adsorption With Feo X -Go Nanocompositessupporting

confidence: 58%

Section: Arsenic Adsorption With Feo X -Go Nanocompositesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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High-performance iron oxide–graphene oxide nanocomposite adsorbents for arsenic removal

Hmidi

2017

Colloids and Surfaces A: Physicochemical and Engineering Aspect

177

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“…Meanwhile, the pore size of the matrices should be signicantly larger than that of the loaded iron oxide nanoparticles, particularly at high iron oxide content, so as to avoid or minimize pore blockages, which would otherwise affect the mass diffusion and consequently the adsorption performance. Typical matrices have included abundant ones, such as naturally occurring minerals, 23 activated carbons, 24 graphene oxide (GO), [25][26][27][28][29][30][31][32][33][34][35][36] and cellulose, 37 as well as some speciallysynthesized ones, such as mesoporous carbons, 38,39 carbon nanotubes, 40 macroporous silica, 41 etc. The majority of composite adsorbents reported to date show limited arsenic adsorption capacities, with signicant room for improvements.…”

Section: -22mentioning

confidence: 99%

Carbon nanosphere–iron oxide nanocomposites as high-capacity adsorbents for arsenic removal

Hmidi³

et al. 2017

RSC Adv.

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aIn the design of iron oxide-derived composite adsorbents for arsenic removal, the matrix selected for the encapsulation of iron oxide active material is critical to their arsenic adsorption performance. The ideal matrix should have a high surface area, high pore volume, and large pores that can accommodate the iron oxide nanoparticles while without causing the undesired pore filling or blockage. In this paper, we report the use of carbon nanospheres (size of ca. 28 nm) featuring high surface area, high pore volume, and hierarchical large mesopore/macropore structures resulting from nanosphere packing/aggregation as the matrix for the design of iron oxide composites. Iron oxide has been encapsulated into the carbon nanospheres with different contents (7-60 wt%). The composites have been systematically characterized for their structural, morphological, and textural properties, and investigated for their performance for arsenic adsorption. An optimum iron oxide content of 13 wt% has been established with high adsorption capacities of 416 and 201 mg g À1 achieved for As(III) and As(V), respectively, which are highest (for As(III)) or among the highest (for As(V)) reported thus far for iron oxide-based adsorbents. These are in contrast to the typically low adsorption capacities found with iron oxide composites involving other carbonbased matrices, such as activated carbon, carbon nanotubes, and mesoporous carbons. The results confirm the high potential of this class of composite adsorbents for arsenic removal. Meanwhile, the structure-performance relationship demonstrated herein is also of value to the further design of highperformance arsenic adsorbents.

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“…Consequently, composite or hybrid structures are promising materials for water treatment. The widely used host materials for nanocomposite include carbonaceous materials like granular activated carbon [25], silica [26][27][28][29], cellulose [30,31], chitosan [32,33], sand [34,35], and polymers [36][37][38]. Some examples include the immobilization of metal oxides on carbon nanotubes for lead, arsenic, and fluoride removal 2 Journal of Nanomaterials [39][40][41], activated carbon immobilized on carbon nanotubes for chromium removal [25], and carbohydrate and iron oxide on multiwalled carbon nanotubes for zinc removal [42].…”

Section: Introductionmentioning

confidence: 99%

Bimetallic Oxide Nanohybrid Synthesized from Diatom Frustules for the Removal of Selenium from Water

Thakkar

Mitra

2017

Journal of Nanomaterials

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Frustules or the rigid amorphous silica cell wall of unicellular, photosynthetic microalgae with unique porous architecture has been used to synthesize a composite by immobilizing zirconium and iron oxides on its surface and in the pores. This was effective for removal of Se from water, which is an emerging contaminant that is a micronutrient at low concentrations but toxic at high concentrations. The adsorption isotherms followed both Langmuir and Freundlich models, and the composite was regenerable. The Langmuir maximum adsorption capacity for Se(IV) ( ) was 227 mg/g, which is among the highest ever reported. The research findings highlight the synthesis of bimetallic composite as well as the potential of diatoms as hosts for nanomaterials for use in water treatment.

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One-step synthesis of magnetic composites of cellulose@iron oxide nanoparticles for arsenic removal

Cited by 298 publications

References 49 publications

High-performance iron oxide–graphene oxide nanocomposite adsorbents for arsenic removal

High-performance iron oxide–graphene oxide nanocomposite adsorbents for arsenic removal

Carbon nanosphere–iron oxide nanocomposites as high-capacity adsorbents for arsenic removal

Bimetallic Oxide Nanohybrid Synthesized from Diatom Frustules for the Removal of Selenium from Water

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