A Novel Nanohybrid Nanofibrous Adsorbent for Water Purification from Dye Pollutants

Homaeigohar, Shahin; Zillohu, Ahnaf Usman; Abdelaziz, Ramzy; Hedayati, Mehdi Keshavarz; Elbahri, Mady

doi:10.3390/ma9100848

Cited by 65 publications

(58 citation statements)

References 63 publications

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“…Nanostructured composite materials have attracted significant attention as new-generation adsorbents for dye removal. Examples include clays, exfoliated titanate layers, mesoporous carbons, carbon nanofibers, and polyanilines, all of which have been used as the main constituent of nanocomposite/composite building blocks [9][10][11][12][13][14] . Among these materials, graphene oxide (GO), a two-dimensional (2D) carbon nanomaterial, offers attractive and unique physicochemical properties 15 and is considered an excellent adsorbent 16 .…”

Section: Introductionmentioning

confidence: 99%

Functionalized magnetic biopolymeric graphene oxide with outstanding performance in water purification

2019

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Graphene oxide (GO) is an attractive material for water treatment, although its high surface energy restricts its practical application. To overcome this challenge, we have developed a well-dispersed and interconnected, functionalized biopolymeric GO with magnetic activity, namely, cl-CS-p(MA)/Fe 3 O 4 NPs. This three-dimensional, sponge-like nanostructured material is composed of graphene oxide nanosheets dispersed in functionalized chitosan/poly (methacrylic acid) and is cross-linked with in situ-developed Fe 3 O 4 nanoparticles. Methacrylic acid (MA)-functionalized chitosan (CS) cross-linked with N,N-methylenebis(acrylamide) (MBA), designated as cl-CS-p(MA), facilitates the stable dispersion of GO nanosheets, providing a proper solid matrix for the generation of well-dispersed in situ Fe 3 O 4 NPs. The methodology allows for the generation of numerous binding sites with an interconnected morphology, facilitating the rapid uptake of a cationic dye in significant quantity, e.g., methylene blue (MB), which is used as a model water pollutant. In this work, the structural architecture of cl-CS-p(MA)/Fe 3 O 4 NPs was characterized with multiple approaches, and the adsorption mechanism was revealed to be an electrostatic interaction. The synthesized nanocomposite showed significant recyclability and structural stability. Adsorption equilibrium was achieved within 20 min, and the maximum adsorption capacity was 2478 mg/g for MB, surpassing the values reported for any other adsorbents to date.

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Section: Introductionmentioning

confidence: 99%

Functionalized magnetic biopolymeric graphene oxide with outstanding performance in water purification

2019

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“…We placed 0.5 g modified Mt into a centrifuge tube containing 25 mL RE ions solution to take an adsorption in the constant temperature oscillator with the volatile rate of 165 r/min for 14 h. Then the mixture underwent a solid/liquid separation process by filtration. The RE concentration was analyzed to calculate the equilibrium adsorption capacity (Q e ) according to the following equation [28,29]:…”

Section: Adsorption Experimentsmentioning

confidence: 99%

Preparation of Modified Montmorillonite and Its Application to Rare Earth Adsorption

et al. 2019

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Montmorillonite, the major clay mineral in the tailings of weathered crust elution-deposited rare earth ores, was modified as an excellent adsorbent to enrich rare earth ions from solutions. It was demonstrated that 5% H 2 SO 4 could be used as a modifier to effectively enhance the adsorption capacity of montmorillonite after modifying for 3 h with a liquid:solid ratio of 40:1 at 90 • C. A superior modified montmorillonite over montmorillonite on adsorption performance was analyzed by the XRD, FT-IR, SEM, and BET (Specific Surface Area and Pore Diameter Analysis). The adsorption behaviors of La 3+ and Y 3+ on modified montmorillonite were fitted well with the Langmuir isotherm model and their saturated adsorption capacities were 0.178 mmol/g to La 3+ and 0.182 mmol/g to Y 3+ , respectively. Furthermore, (NH 4 ) 2 SO 4 as a common leaching agent in weathered crust elution-deposited rare earth ores, were successfully used as the eluent to recover the adsorbed rare earth ions. and edges and this is responsible for giving superior activity to Mt as an adsorbent [12]. Mt is formed by negatively charged silicate layers (about 1 nm) connected by electrostatic interaction. It belongs to the 2:1 clay minerals, the basic structure unit of which is composed of two silica tetrahedrons with an interlayer of aluminum oxygen octahedron. The atoms in this interlayer, which are common to both sheets, become oxygen instead of hydroxyl [13]. The isomorph substitution of Al 3+ by Si 4+ in the tetrahedral sheet and by Mg 2+ or Zn 2+ in the octahedral sheet results in a net negative charge on the clay surface, which makes it gain the ability to absorb certain cations. Moreover, Mt invariably contains exchangeable cations and anions held to the surface. The prominent cations and anions found between the sheets are K + , Na + , Mg 2+ , Cl − etc., and these ions are easily exchanged by other lower valence ions, which mainly carries out between the crystal layers and shows no effect on the Mt structure [14]. Adsorption of cations onto Mt involves two distinct mechanisms: (1) an ion exchange reaction at permanent charge sites, and (2) formation of complexes with the surface hydroxyl groups [15]. However, the industrial application of Mt is limited due to the crystal structure and negative charge of natural clays and interlayer impurity defects [16]. Single modifications of Mt through acid activation, inorganic salts, and cationic surfactant or polymer activation have attracted considerable interest and the adsorption capability of clay minerals can be successfully improved through modification [17].In industry, the RE concentration of leachate from weathered crust elution-deposited RE ores is approximately 0.2-2.0 g/L [11]. Although the precipitation and extraction are used to recycle RE, there is still some residual RE in the liquor with the concentration approximately below 0.15 g/L. To some extent, a large amount of RE resources is wasted. Therefore, the reuse of dumped tailings to enrich and recover RE in low-concentration solution is ...

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“…Their purification action mainly relies on sieving of the pollutants, and thus they require a porous structure whose pore size is less than the size of the solute to be separated. Other than the membranes, in a sustainable manner and using conventional and also emerging materials, functionalized adsorbents have shown applicability in the removal of even molecules and tiny pollutants based on physical/chemical interactions or biological functions [2][3][4][5][6][7]. Accordingly, there is no need for the construction of porous materials with small pore sizes that could impose high pressure differences.…”

Section: Introductionmentioning

confidence: 99%

“…Despite such circumstances, the adsorbent was successful in the removal of nanoparticles (97%) as well as proteins (88% BSA and 81% Candida antarctica Lipase B (Cal-B)). In another research, we developed a nanofibrous adsorbent comprising polyethersulfone (PES) nanofibers that were functionalized by the inclusion of vanadium oxide (V 2 O 5 ) nanoparticles [6]. This adsorbent system was able to separate methylene blue (MB) dye from water with an efficiency of 85% under alkaline condition and high temperature.…”

Section: Introductionmentioning

confidence: 99%

An Amphiphilic, Graphitic Buckypaper Capturing Enzyme Biomolecules from Water

Homaeigohar

2018

Water

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The development of carbon nanomaterials for adsorption based removal of organic pollutants from water is a progressive research subject. In this regard, carbon nanomaterials with bifunctionality towards polar and non-polar or even amphiphilic undesired materials are indeed attractive for further study and implementation. Here, we created carbon buckypaper adsorbents comprising amphiphilic (oxygenated amorphous carbon (a-CO x )/graphite (G)) nanofilaments that can dynamically adsorb organic biomolecules (i.e., urease enzyme) and thus purify the wastewaters of relevant industries. Given the dynamic conditions of the test, the adsorbent was highly efficient in adsorption of the enzyme (88%) while being permeable to water (4750 L·h −1 m −2 bar −1 ); thus, it holds great promise for further development and upscaling. A subsequent citric acid functionalization declined selectivity of the membrane to urease, implying that the biomolecules adsorb mostly via graphitic domains rather than oxidized, polar amorphous carbon ones.

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A Novel Nanohybrid Nanofibrous Adsorbent for Water Purification from Dye Pollutants

Cited by 65 publications

References 63 publications

Functionalized magnetic biopolymeric graphene oxide with outstanding performance in water purification

Functionalized magnetic biopolymeric graphene oxide with outstanding performance in water purification

Preparation of Modified Montmorillonite and Its Application to Rare Earth Adsorption

An Amphiphilic, Graphitic Buckypaper Capturing Enzyme Biomolecules from Water

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