Anion selective pTSA doped polyaniline@graphene oxide-multiwalled carbon nanotube composite for Cr(VI) and Congo red adsorption

Ansari, Mohammad Omaish; Kumar, Rajeev; Ansari, Shahid Pervez; Barakat, M.A.; Alshahrie, Ahmed

doi:10.1016/j.jcis.2017.02.034

Cited by 161 publications

(34 citation statements)

References 33 publications

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“…The pseudo-second order kinetic model was also clearly a better fit for the adsorption of CR onto pure GnP, which is consistent with a previous study [44]. However, the sorption of CR onto pure CNF could be described as either pseudo first-order kinetics or pseudo second-order kinetics, as indicated by the similar R 2 (0.94-0.98) for both models.…”

Section: Effect Of Contact Time and Adsorption Kineticssupporting

confidence: 90%

“…CNF-GnP was able to adsorb both cationic MB and anionic CR and yielded higher uptake values compared to recent studies using cellulose, activated carbon, graphene, and CNT-based composites. Polyaniline@GO-multiwalled carbon nanotube nanocomposite 66.67 [44] Nickel nanoparticles/porous carbon-carbon nanotube hybrids 312 [50] Chitosan hydrogel beads impregnated with CNT 450.4 [51] 3D rGO/L-Cys hydrogel 660 [52] Functionalized multiwalled carbon nanotubes 148 [53] Graphene/cellulose nanofibers 227.27 [28] Polyacrylamide grafted quaternized cellulose 349.28 [54] GO/calcium alginate composites 181.81 [55] CaCO 3 −cellulose aerogel 75.81 [56]…”

Section: Effect Of Initial Dye Concentration and Adsorption Isothermmentioning

confidence: 99%

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Cellulose Nanofibril/Carbon Nanomaterial Hybrid Aerogels for Adsorption Removal of Cationic and Anionic Organic Dyes

Dichiara

et al. 2020

Nanomaterials

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Advances in nanoscale science and engineering are providing new opportunities to develop promising adsorbents for environmental remediation. Here, hybrid aerogels are assembled from cellulose nanofibrils (CNFs) and carbon nanomaterials to remove cationic dye methylene blue (MB) and anionic dye Congo red (CR) in single and binary systems. Two classes of carbon nanomaterials, carbon nanotubes (CNTs) and graphene nanoplates (GnPs), are incorporated into CNFs with various amounts, respectively. The adsorption, mechanics and structure properties of the hybrid aerogels are investigated and compared among different combinations. The results demonstrate CNF–GnP 3:1 hybrid exhibits the best performance among all composites. Regarding a single dye system, both dye adsorptions follow a pseudo-second-order adsorption kinetic and monolayer Langmuir adsorption isotherm. The maximal adsorption capacities of CNF–GnP aerogels for MB and CR are 1178.5 mg g−1 and 585.3 mg g−1, respectively. CNF–GnP hybrid show a superior binary dye adsorption capacity than pristine CNF or GnP. Furthermore, nearly 80% of MB or CR can be desorbed from CNF–GNP using ethanol as the desorption agent, indicating the reusability of this hybrid material. Hence, the CNF–GnP aerogels show great promise as adsorption materials for wastewater treatment.

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Section: Effect Of Contact Time and Adsorption Kineticssupporting

confidence: 90%

Section: Effect Of Initial Dye Concentration and Adsorption Isothermmentioning

confidence: 99%

Cellulose Nanofibril/Carbon Nanomaterial Hybrid Aerogels for Adsorption Removal of Cationic and Anionic Organic Dyes

Dichiara

et al. 2020

Nanomaterials

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“…The first linear part indicates that the removal of F − , Ca 2+ , and Mg 2+ was initially controlled by boundary diffusion—this process is known as boundary layer diffusion of the solute molecule . The fast initial stage of F − indicates the rapid attainment of equilibrium . The second stage is assigned to the intraparticle step, and the final stage is adsorption equilibrium .…”

Section: Resultsmentioning

confidence: 99%

Impact of Ca²⁺ and Mg²⁺ on the Removal of F⁻ by Magnesium Potassium Phosphate

Deng

Wang

2019

CLEAN Soil Air Water

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This study investigates the influence of Ca2+ and Mg2+ on the removal of F− by magnesium potassium phosphate (MPP) from water. The kinetic experiments reveal that the F− concentration decreased from 3.5 to 3.31 mg L−1 in a single (F−) system and to 1.45 mg L−1 in a ternary system (F−, Ca2+, and Mg2+) after 1 min, respectively. Thus, the F− removal efficiencies are found to increase by about 53% with the co‐active effect of Ca2+ and Mg2+ in the solution. Moreover, Ca2+ and Mg2+ are almost completely removed in the F−, Ca2+, and Mg2+ system. According to the pseudo‐first‐order modeling, the rate constants k for F−, Ca2+, and Mg2+ are 0.00348, 0.0106, and 0.0159 min−1 respectively; thus, Mg2+ > Ca2+ > F−. In the ternary system, the removal efficiencies are 53.29–66.03% for F−, 99.99–100% for Ca2+, and 87.21–95.19% for Mg2+ with initial pH 5–10. The removal efficiencies of F− increases with increases in initial concentrations of F−, Ca2+, and Mg2+. The removal of F− is governed by two routes: 1) adsorption by electrostatic interactions and outer sphere surface complexation; 2) co‐precipitation with Ca3(PO4)2, CaHPO4, Mg3(PO4)2, and Mg(OH)2.

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“…Such polyelectrolyte as cetyltrimethylammonium was also applied to functionalization [24]. Insoluble synthetic or natural polymers were used for preparation of GO-containing composites: polyethyleneimine [25], polyaniline [26], chitosan [27]. GO was also embedded to alginate beads [28].…”

Section: Introductionmentioning

confidence: 99%

“…GO was also embedded to alginate beads [28]. Chromate [23][24][25][26]28] and arsenate anions [27,28] can be effectively removed from water using the obtained material. GO evidently increases surface area of the polymers facilitating adsorption of anions.…”

Section: Introductionmentioning

confidence: 99%

Composite adsorbents including oxidized graphene: effect of composition on mechanical durability and adsorption of pesticides

Dzyazko¹,

Ogenko²,

Shteinberg³

et al. 2019

Him. Fiz. Tehnol. Poverhni

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A number of multifunctional composite adsorbents based on hydrated zirconium dioxide has been synthesized. The inorganic ion exchanger contained nanosheets of oxidized graphene (GO), the modifier amount was 0.5-7 mass. %. The composites were investigated with methods of transmission electron microscopy and nitrogen adsorption-desorption, macropores were determined using water as a working liquid. It has been found that increasing of GO content depresses microporosity, but meso-and macroporosity grow. Crushing strength reduces exponentially with increase of total pore volume from 0.49 to 0.62 cm 3 g -1 . Removal of phenol from water containing also inorganic ions was investigated. Adsorption capacity reaches 0.15-0.85 (phenol), 0.5-0.85 (Ca 2+ and Mg 2+ ), 0.005-0.045 (SO 4 2-) mmol g -1 . When the GO content in the composites is 0.5-2 %, this carbon addition improves adsorption of cations and organic molecules comparing with hydrated zirconium dioxide. Further increase in GO amount causes no sufficient effect on adsorption due to decline of specific surface area of the composites. It has been suggested that the optimal content of the modifier, which provides the maximal growth of adsorption capacity, is 2 %. This composite is obtained in a form of large granules (0.3-0.5 mm), their crushing strength is 9 bar. The material was applied to removal of pesticides (acetomipride, carboxine, epoxyconazole and thiamethoxam) from aqueous multicomponent solution under batch conditions. The residual content of carboxine and epoxyconazole, molecules of which contain benzene rings, is lower than the maximal allowable concentration. No deterioration of pesticide uptake has been found after five cycles of adsorption-regeneration.

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Anion selective pTSA doped polyaniline@graphene oxide-multiwalled carbon nanotube composite for Cr(VI) and Congo red adsorption

Cited by 161 publications

References 33 publications

Cellulose Nanofibril/Carbon Nanomaterial Hybrid Aerogels for Adsorption Removal of Cationic and Anionic Organic Dyes

Cellulose Nanofibril/Carbon Nanomaterial Hybrid Aerogels for Adsorption Removal of Cationic and Anionic Organic Dyes

Impact of Ca²⁺ and Mg²⁺ on the Removal of F⁻ by Magnesium Potassium Phosphate

Composite adsorbents including oxidized graphene: effect of composition on mechanical durability and adsorption of pesticides

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Anion selective pTSA doped polyaniline@graphene oxide-multiwalled carbon nanotube composite for Cr(VI) and Congo red adsorption

Cited by 161 publications

References 33 publications

Cellulose Nanofibril/Carbon Nanomaterial Hybrid Aerogels for Adsorption Removal of Cationic and Anionic Organic Dyes

Cellulose Nanofibril/Carbon Nanomaterial Hybrid Aerogels for Adsorption Removal of Cationic and Anionic Organic Dyes

Impact of Ca2+ and Mg2+ on the Removal of F− by Magnesium Potassium Phosphate

Composite adsorbents including oxidized graphene: effect of composition on mechanical durability and adsorption of pesticides

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Impact of Ca²⁺ and Mg²⁺ on the Removal of F⁻ by Magnesium Potassium Phosphate