Microwaves initiated synthesis of activated carbon-based composite hydrogel for simultaneous removal of copper(II) ions and direct red 80 dye: A multi-component adsorption system

Oladipo, Akeem Adeyemi; Gazi, Mustafa

doi:10.1016/j.jtice.2014.09.027

Cited by 60 publications

(20 citation statements)

References 55 publications

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“…ln K 2 was plotted against 1/T to determine Ea from slope ( –Ea/R) and A as intercept. Ea values, which fall between the range of 5 kJ/mol to 40 kJ/mol, confirmed that the adsorption of Cu(II) and NY dye by CS‐MMT was dominated by physical adsorption …”

Section: Resultsmentioning

confidence: 53%

Synergistic removal of Cu(II) and nitrazine yellow dye using an eco‐friendly chitosan‐montmorillonite hydrogel: Optimization by response surface methodology

Ngwabebhoh

Erdem

Yıldız

2016

J of Applied Polymer Sci

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A comprehensive feasibility study on adsorption of Cu(II) and a water‐soluble nitrazine yellow (NY) dye by chitosan‐montmorillonite (CS‐MMT) hydrogel as the biosorbent was investigated as a function of biosorbent dosage, initial concentration, pH, temperature, and the presence of salts. Box–Behnken methodology was applied to optimize the adsorption experiments. Maximum adsorption values were determined as 132.74 mg/g and 144.41 mg/g at pH = 5.0, for Cu(II) and NY dye, respectively. Equilibrium isotherms of Langmuir and Freundlich were analyzed by the non‐linear regression model. The equilibrium data were well described by Freundlich model and the adsorption process well fitted pseudo‐second order kinetics. The enthalpy change of adsorption (ΔH°) were calculated as −3.78 kJ/mol and −5.75 kJ/mol for Cu(II) and NY dye, respectively, indicating that the adsorption processes were exothermic. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43664.

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Section: Resultsmentioning

confidence: 53%

Synergistic removal of Cu(II) and nitrazine yellow dye using an eco‐friendly chitosan‐montmorillonite hydrogel: Optimization by response surface methodology

Ngwabebhoh

Erdem

Yıldız

2016

J of Applied Polymer Sci

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“…3(a), at pH<pH zpc , the surface charge of MFC is net positive, and this can uptake the AR25 anions via electrostatic mechanism while the surface is a net negative at pH>pH zpc . Boehm titration described in [39] was employed to quantify the oxygenated acidic surface on MFC and obtained results are presented in Table 2.…”

Section: Characterization Of Biosorbentmentioning

confidence: 99%

Two-stage batch sorber design and optimization of biosorption conditions by Taguchi methodology for the removal of acid red 25 onto magnetic biomass

Oladipo

Gazi²

2015

Korean J. Chem. Eng.

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Biomagnetic material (MFC) was synthesized via simple co-precipitation and used as biosorbent for the removal of acid red 25 (AR25) under optimized conditions. The characteristics of MFC were studied using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), vibrating sample magnetometer (VSM), Boehm titration and scanning electron microscopy (SEM). Optimum removal of AR25 was achieved at pH=5.0. The equilibrium data were well described by the Sips and Freundlich models. Taguchi methodology was employed to optimize the biosorption experiments. 411.56 mg/g and 96.8% were obtained as the biosorption capacity and removal efficiency, respectively, at the optimum conditions of ionic strength (0.5 M), influent volume (300 L) and MFC dosage (4 g). The contact time for removal of 96% AR25 in two-stage batch system is 400.8 min which is lower than the single-stage treatment process (895 min).

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“…Lead is one of the heavy metals found in water, it is a dangerous element as it is neurotoxic and harmful to health . Other elements often found in water are nickel and copper …”

Section: Introductionmentioning

confidence: 99%

“…Although there are papers using composites of these polymers for drug release, or similar compounds for mucoadhesive films, there are no papers using these composites for metal removal. PAAm is a polymer having a very high water absorbing capacity; this quality makes PAAm a suitable material for both water and metal adsorption . HPC is a polymer derived from cellulose, it is nontoxic, readily available, it is used as food additive and also in the pharmaceutical industry.…”

Section: Introductionmentioning

confidence: 99%

Heavy metal removal using hydroxypropyl cellulose and polyacrylamide gels, kinetical study

Zamarripa–Cerón

García‐Cruz

Martínez–Arellano

et al. 2015

J of Applied Polymer Sci

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In this article we report the removal of Pb, Ni and Cu using a hydrogel made with hydroxypropyl cellulose (HPC) and polyacrylamide (PAAm). The hydrogel successfully removed those metals, as shown by the results of atomic absorption spectroscopy; the polymer removed 53% of Pb, 52% of Ni and 51% of Cu. Different pHs were tried for these polymers. The highest metal removal was found at 408C. The adsorption kinetics fitted Langmuir and Freundlich isotherms. Metal particles were detected on the hydrogel with electron microscopy and energy-dispersive X-ray spectroscpy, confirming that the gel removed the metals from the testing solutions. This polymer is a good option for treating wastewater and industrial waters as it removes metals and is composed of nontoxic materials.

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Microwaves initiated synthesis of activated carbon-based composite hydrogel for simultaneous removal of copper(II) ions and direct red 80 dye: A multi-component adsorption system

Cited by 60 publications

References 55 publications

Synergistic removal of Cu(II) and nitrazine yellow dye using an eco‐friendly chitosan‐montmorillonite hydrogel: Optimization by response surface methodology

Synergistic removal of Cu(II) and nitrazine yellow dye using an eco‐friendly chitosan‐montmorillonite hydrogel: Optimization by response surface methodology

Two-stage batch sorber design and optimization of biosorption conditions by Taguchi methodology for the removal of acid red 25 onto magnetic biomass

Heavy metal removal using hydroxypropyl cellulose and polyacrylamide gels, kinetical study

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