Functionalization of magnetic chitosan with graphene oxide for removal of cationic and anionic dyes from aqueous solution

Gul, Kashif; Sohni, Saima; Waqar, Muttaqia; Ahmad, Farediah; Norulaini, N.A. Nik; K., Mohd. Omar A.

doi:10.1016/j.carbpol.2016.06.045

Cited by 174 publications

(55 citation statements)

References 69 publications

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“…A positive value of Δ H 0 implied that the sorption of both dyes onto biogenic nanoadsorbent was endothermic in nature. Similar observations were reported by Gul et al while studying the adsorptive separation of alizarin yellow onto functionalized magnetic nanoparticles. The Δ H 0 value was positive for both the dyes.…”

Section: Resultssupporting

confidence: 88%

Biogenic fabrication of iron nanoadsorbents from mixed waste biomass for aqueous phase removal of alizarin red S and tartrazine: Kinetics, isotherm, and thermodynamic investigation

Gautam

Shivapriya

Banerjee

et al. 2019

Env Prog and Sustain Energy

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Present work deals with the facile and ecologically viable production of iron nanoadsorbents by utilizing different waste plant biomass, orange peel, flower waste, and environmentally harmful Alligator weed. The as‐prepared nanoadsorbents were applied for the aqueous phase minimization of toxic dyes, alizarin red S and tartrazine. Different techniques, namely, X‐ray diffraction, Fourier transform infra‐red spectroscopy, scanning electron microscopy, dynamic light scattering and magnetic properties measurement system, were applied to characterize the synthesized material. Impact of various experimental conditions like pH, adsorbent dose, contact time, and temperature on removal trend was examined. The acidic medium positively favored the process of sorption. Kinetic analysis revealed that the adsorption of both the dyes followed pseudo‐second‐order kinetic model. Equilibrium sorption data were fitted better to Freundlich model as compared with Langmuir model. The maximum adsorption capacities at 50°C were 42.58 and 68.78 mg g–1 for alizarin red S and tartrazine at pH 4.0 and 2.0, respectively. Thermodynamic parameters exhibited that the sorption of both the dyes onto nanoadsorbent was spontaneous and endothermic with increased randomness at the solid–liquid interface. Desorption experiment demonstrated that the regenerated adsorbent can be recycled efficiently up to three times. Overall, the prepared nanomaterials exhibit remarkable removal competency for both dyes tested like alizarin red S and tartrazine.

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Section: Resultssupporting

confidence: 88%

Biogenic fabrication of iron nanoadsorbents from mixed waste biomass for aqueous phase removal of alizarin red S and tartrazine: Kinetics, isotherm, and thermodynamic investigation

Gautam

Shivapriya

Banerjee

et al. 2019

Env Prog and Sustain Energy

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show abstract

“…In recent years, biomass has been accepted as an appropriate low-cost adsorbent for the removal of dyes from aqueous solution. Many types of natural and modified biomass, such as biochars, 13 mango leaves, 14 Daucus carota, 15 Irvingia gabonenses, 16 agricultural by-products, 17 chitin, 18 chitosan [19][20][21][22][23] and functionalized chitosan, [24][25][26] have shown promising results in dye adsorption applications. However, related reports on utilizing chitosan to remove Remazol Brilliant Violet (RBV; Fig.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Remazol Brilliant Violet Onto Chitosan 10b in Aqueous Solution: Kinetics, Equilibrium and Thermodynamics Studies

Karmaker¹,

Nag²,

Saha³

2019

Cellulose Chem. Technol.

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The adsorption characteristics of Remazol Brilliant Violet (RBV) dye onto chitosan 10B were investigated in aqueous solutions as a function of solution pH, dye concentration, ionic strength and temperature, respectively. The adsorption kinetics data obtained from various batch experiments were analyzed by using pseudo-first-and pseudo-second-order, as well as Elovich and intraparticle diffusion kinetic models. The results exhibited that the sorption process obeys pseudo-second order kinetics, whereas intraparticle diffusion is the rate determining step. The equilibrium adsorption isotherm data are fitted better by the Langmuir model rather than by the Freundlich, Temkin and Dubinin-Radushkevich models. Moreover, the mean adsorption energy (E) from the Dubinin-Radushkevich isotherm and the activation energy (E a ) from the Arrhenius equation indicate that the RBV adsorption onto chitosan 10B is a physisorption process. Thermodynamic parameters, such as the changes in free energy (∆G), enthalpy (∆H) and entropy (∆S), suggest that the RBV dye adsorption onto chitosan 10B in aqueous solution is spontaneous and endothermic in nature. Desorption tests were carried out in a NaOH solution (pH 12.5) and the chitosan flakes were found to be reusable.

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“…The small weight loss observed in ZnO was 0.47%, attributed to desorption of solvent molecules physically adsorbed on the materials. Comparably, the weight loss of ZnO-G from room temperature to 325 °C is attributed to the removal of surface-bound water and NMP; the decomposition of the carbon framework started from 325 °C and continued up to 600 °C [28,29]. Based on the above results, the content of ZnO in ZnO-G hybrids is about 96.4%.…”

Section: Resultsmentioning

confidence: 98%

Enhanced Acetone Sensing Characteristics of ZnO/Graphene Composites

Zhang

Cen

et al. 2016

Sensors

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ZnO/graphene (ZnO-G) hybrid composites are prepared via hydrothermal synthesis with graphite, N-methyl-pyrrolidone (NMP), and Zn(NO3)2·6H2O as the precursors. The characterizations, including X-ray diffraction (XRD), thermogravimetric analyses (TGA), Raman spectroscopy, and transmission electron microscopy (TEM) indicate the formation of ZnO-G. Gas sensors were fabricated with ZnO-G composites and ZnO as sensing material, indicating that the response of the ZnO towards acetone was significantly enhanced by graphene doping. It was found that the ZnO-G sensor exhibits remarkably enhanced response of 13.3 at the optimal operating temperature of 280 °C to 100 ppm acetone, an improvement from 7.7 with pure ZnO.

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Functionalization of magnetic chitosan with graphene oxide for removal of cationic and anionic dyes from aqueous solution

Cited by 174 publications

References 69 publications

Biogenic fabrication of iron nanoadsorbents from mixed waste biomass for aqueous phase removal of alizarin red S and tartrazine: Kinetics, isotherm, and thermodynamic investigation

Biogenic fabrication of iron nanoadsorbents from mixed waste biomass for aqueous phase removal of alizarin red S and tartrazine: Kinetics, isotherm, and thermodynamic investigation

Adsorption of Remazol Brilliant Violet Onto Chitosan 10b in Aqueous Solution: Kinetics, Equilibrium and Thermodynamics Studies

Enhanced Acetone Sensing Characteristics of ZnO/Graphene Composites

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