m-Phenylenediamine-modified polypyrrole as an efficient adsorbent for removal of highly toxic hexavalent chromium in water

Kera, Nazia H.; Bhaumik, Madhumita; Pillay, Kriveshini; Ray, Suprakas Sinha; Maity, Arjun

doi:10.1016/j.mtcomm.2018.02.033

Cited by 33 publications

(24 citation statements)

References 43 publications

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“…PPy-mPD/Fe 3 O 4 nanocomposite was prepared via the in-situ polymerisation of pyrrole and mPD monomers in the presence of Fe 3 O 4 , according to the method reported by Kera et al [3]. Typically, Fe 3 O 4 (0.05 g) was uniformly dispersed in 100 mL of deionised water by ultrasonication for 30 min.…”

Section: Synthesis Of Ppy-mpd/fe 3 O 4 Nanocompositementioning

confidence: 99%

“…Py monomer, 0.8 mL, was then transferred into the mixture, which was agitated to disperse the Py uniformly. FeCl 3 solution was prepared in a separate container by dissolving 6 g of FeCl 3 in 100 mL of deionised water. The FeCl 3 solution was then transferred into the mixture all at once, and agitated by shaking for 10 min at room temperature.…”

Section: Synthesis Of Ppy-mpd/fe 3 O 4 Nanocompositementioning

confidence: 99%

“…Batch adsorption experiments were executed to study the effect of adsorbent dose, solution pH, initial Cr(VI) concentration, temperature and co-existing ions on Cr(VI) adsorption by PPy-mPD/Fe 3 O 4 nanocomposite. Different concentrations of Cr(VI) solution were prepared by diluting the 1000 mg/L Polymers 2020, 12, 679 4 of 17 Cr(VI) stock solution to evaluate these various parameters.…”

Section: Batch Adsorption Experimentsmentioning

confidence: 99%

“…Both where m (g) and V (L) represent the mass of the adsorbent and the volume of Cr(VI) solution used, respectively. Nonlinear and linear forms of the Langmuir and Freundlich isotherm models are presented in the following expressions, respectively, (Equations (3)-(6)) [3].…”

Section: Batch Adsorption Experimentsmentioning

confidence: 99%

“…where q m (mg/g), K L (L/mg), K F (mg/g) and n each represent the Langmuir maximum adsorption capacity, Langmuir constant, Freundlich constant and adsorption intensity, respectively [2,3].…”

Section: Batch Adsorption Experimentsmentioning

confidence: 99%

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Influence of Magnetic Nanoparticles on Modified Polypyrrole/m-Phenylediamine for Adsorption of Cr(VI) from Aqueous Solution

et al. 2020

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A novel, modified polypyrrole/m-phenylediamine (PPy-mPD) composite, decorated with magnetite (Fe 3 O 4 ) nanoparticles, and prepared via an in-situ oxidative polymerisation, was investigated. The PPy-mPD/Fe 3 O 4 nanocomposite was employed for the removal of highly toxic oxyanion hexavalent chromium Cr(VI) from an aqueous solution. The structure and successful formation of the PPy-mPD/Fe 3 O 4 nanocomposite was confirmed and investigated using various techniques. The presence of Fe 3 O 4 was confirmed by high resolution transmission electron microscopy, with an appearance of Fe lattice fringes. The estimation of the saturation magnetisation of the nanocomposite, using a vibrating sample magnetometer, was observed to be 6.6 emu/g. In batch adsorption experiments, PPy-mPD/Fe 3 O 4 nanocomposite (25 mg) was able to remove 99.6% of 100 mg/L of Cr(VI) at pH 2 and 25 • C. Adsorption isotherms were investigated at different Cr(VI) concentration (100-600 mg/L) and temperature (15-45 • C). It was deduced that adsorption follows the Langmuir model, with a maximum adsorption capacity of 555.6 mg/g for Cr(VI) removal. Furthermore, isotherm data were used to calculate thermodynamic values for Gibbs free energy, enthalpy change and entropy change, which indicated that Cr(VI) adsorption was spontaneous and endothermic in nature. Adsorption-desorption experiments revealed that the nanocomposite was usable for two consecutive cycles with no significant loss of adsorption capacity. This research demonstrates the application potential for the fascinating properties of PPy-mPD/Fe 3 O 4 nanocomposite as a highly efficient adsorbent for the removal of heavy metal ions from industrial wastewater.

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Section: Synthesis Of Ppy-mpd/fe 3 O 4 Nanocompositementioning

confidence: 99%

Section: Synthesis Of Ppy-mpd/fe 3 O 4 Nanocompositementioning

confidence: 99%

Section: Batch Adsorption Experimentsmentioning

confidence: 99%

Section: Batch Adsorption Experimentsmentioning

confidence: 99%

Section: Batch Adsorption Experimentsmentioning

confidence: 99%

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Influence of Magnetic Nanoparticles on Modified Polypyrrole/m-Phenylediamine for Adsorption of Cr(VI) from Aqueous Solution

et al. 2020

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Chemically Modified Carbon Nanotubes for Water Purification System

Mazrouaa¹,

Mousa²,

Mohamed³

2022

Chemically Modified Carbon Nanotubes for Commercial Applications

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Application of eco‐friendly multifunctional porous graphene oxide for adsorptive sequestration of chromium in aqueous solution

Nkutha

Diagboya

Mtunzi

et al. 2020

Water Environment Research

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Graphene oxide (GO) was functionalized using two silanes ((3‐aminopropyl)‐triethoxysilane and (3‐mercaptopropyl)‐triethoxysilane) to obtain, separately, the eco‐friendly amine‐functionalized GO (GONH) and thiol‐functionalized GO (GOSH). Both silanes were also used together to obtain the amine–thiol dual‐functionalized GO (GOSN). Various physicochemical characterizations were obtained including spectra from using Fourier‐transform infrared (FTIR) spectrometer, thermogravimetric analyzer, and X‐ray diffractometer. The adsorbents were used for a comparative study of Cr adsorption from aqueous solution. The obtained data were fitted to pseudo‐first order (PFO) and pseudo‐second order (PSO) models, the homogeneous fractal pseudo‐second order (FPSO), and the Weber–Morris intraparticle diffusion (IPD) kinetics models. Model parameters of the Langmuir and Freundlich adsorption isotherm models, as well as the thermodynamics, were calculated. Characterization results showed successful functionalizations. The GONH, GOSH, and GOSN exhibited alkaline, acidic, and neutral pH, respectively, in water. Amine and thiol functional groups were observed in the new adsorbents, as well as reduced orderliness. The adsorbents had higher density per unit weight and better thermal stability than pristine GO. Equilibrium Cr adsorption was attained within 60 min for all adsorbents. The PSO and FPSO described the rate data better. The Cr adsorption decreased as solution pH increased; optimum adsorption was recorded at pH 2. Equilibrium adsorption data fitted the Langmuir adsorption isotherm model for the GONH, while it fitted the Freundlich for both GOSH and GOSN. The adsorption process was theoretically exothermic process that was spontaneous processes. The Cr adsorption capacities of these adsorbents are 114, 89.6, and 173 mg/g for GONH, GOSH, and GOSN, respectively, and these were better than several reported graphene‐based adsorbents and suggest the potential of these adsorbents for water treatment.Practitioner points Graphene oxide was mono and dual‐functionalized with amine and thiol groups for Cr adsorption. The adsorption capacities of these adsorbents were better than several earlier reported. These adsorbents may be used for real contaminated water treatment.

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m-Phenylenediamine-modified polypyrrole as an efficient adsorbent for removal of highly toxic hexavalent chromium in water

Cited by 33 publications

References 43 publications

Influence of Magnetic Nanoparticles on Modified Polypyrrole/m-Phenylediamine for Adsorption of Cr(VI) from Aqueous Solution

Influence of Magnetic Nanoparticles on Modified Polypyrrole/m-Phenylediamine for Adsorption of Cr(VI) from Aqueous Solution

Chemically Modified Carbon Nanotubes for Water Purification System

Application of eco‐friendly multifunctional porous graphene oxide for adsorptive sequestration of chromium in aqueous solution

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