Effective removal of Congo red dye from aqueous solution using modified xanthan gum/silica hybrid nanocomposite as adsorbent

Ghorai, Soumitra; Sarkar, Amit Kumar; Panda, Asit Baran; Pal, Sagar

doi:10.1016/j.biortech.2013.06.108

Cited by 244 publications

(121 citation statements)

References 32 publications

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“…The surface area, average pore diameter and total pore volume were enhanced after the incorporation of TiO 2 NPs onto the grafted SA-g-PAA hydrogel (Table S1). The interfacial interactions between SA-g-PAA hydrogel and TiO 2 NP have great influence on pore structure of the material as evident from this study (Ghorai et al, 2013). SEM study well supported this result as well-developed pores can be seen clearly in the surface morphology of SA-g-PAA/TiO 2 hydrogel nanocomposite in comparison to SA-g-PAA hydrogel, i.e.…”

Section: Betsupporting

confidence: 81%

Synthesis, characterization and adsorption studies of an acrylic acid-grafted sodium alginate-based TiO₂hydrogel nanocomposite

Thakur

Arotiba

2017

Adsorption Science & Technology

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Hydrogel nanocomposites were synthesized by solution polymerization of acrylic acid in the presence of sodium alginate biopolymer and TiO 2 nanoparticle. TiO 2 nanoparticle and N,N-methylene-bisacrylamide was used as an inorganic and organic crosslinker, respectively. The structure and morphology of the nanocomposites were investigated using X-Ray Diffraction (XRD), Fourier Transform Infra-Red Spectroscopy (FTIR), Scanning Electron Microscopy (SEM), Brunauer-EmmettTeller (BET) and thermogravimetric analysis techniques. The nanocomposites hydrogel was used for the adsorption of methyl violet dye from water. The influence of TiO 2 nanoparticle, sodium alginate content and grafting on adsorption were studied. The results showed that a pseudo-second-order adsorption kinetic was predominant in the adsorption of methyl violet onto the nanocomposite hydrogel. The experimental equilibrated adsorption capacity of the nanocomposite hydrogel agrees with Langmuir isotherm. Maximum adsorption capacity of 1156.61 mg g À1 and adsorption efficiency of 99.6% towards methyl violet were obtained for the hydrogel nanocomposite.

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Section: Betsupporting

confidence: 81%

Synthesis, characterization and adsorption studies of an acrylic acid-grafted sodium alginate-based TiO₂hydrogel nanocomposite

Thakur

Arotiba

2017

Adsorption Science & Technology

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“…However, other interactions such as ion exchange mechanism should not to be ignored. 32,33 As shown in Table 2, the best composition of TG-g-P(MMA)/B for CR dye over the studied pH range was 20TG-B. This suggests that the interaction of amine group in CR with -OH groups in B have great effect in adsorption process.…”

Section: Adsorption Mechanismmentioning

confidence: 90%

Novel tunable composites based on bentonite and modified tragacanth gum for removal of acid dyes from aqueous solutions

2015

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A series of new adsorbents derived from tragacanth gum-graft-poly(methyl methacrylate) and bentonite (TG-g-PMMA/B) were synthesized. The developed composites were evaluated by removal of congo red (CR), methyl orange (MO), and acid blue 113 (AB-113) as model anionic azo dyes from aqueous solutions followed by UV-Vis spectrophotometric determination. It was revealed that the simultaneous introduction of inorganic bentonite clay into the TG-g-PMMA polymer matrix drastically improved capability of the adsorbent and surface morphology of the composites in comparison with TG, and TG graft copolymer and led to better dispersion in the polymeric matrix without agglomeration.Furthermore, the chemical structures of the adsorbate molecules affect the specific interactions of the adsorbents with adsorbates. The adsorbents were characterized by using FTIR, SEM, and TG/DTA analysis. The effect of various factors influence the dye adsorption including the adsorbent dose, sample pH, contact time, and dye concentration were investigated and optimized by response surface methodology (RSM) using central composite design. Under the optimum conditions, maximum adsorption of the CR, MO, and AB-113 dyes were observed at pH 8.5 with adsorbent dose of 5 mg mL À1 , 30 mg mL À1 , and 75 mg mL À1 , respectively. The dye adsorption process was controlled by pseudosecond order and intraparticle diffusion kinetic models. The adsorption equilibrium data of the studied dyes well fitted with Langmuir isotherm with maximum adsorption capacity of 900, 750, and 8.5 mg g À1 for CR, MO, and AB-113, respectively.

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“…The C values (39.91-94.17 mg g −1 ) increased with initial dye concentration (100-250 mg L −1 , Table 3) increasing, demonstrating that an increase in the initial dye concentration promoted a boundary layer diffusion effect. Thus it can be concluded that surface adsorption (pseudosecond-order) and intraparticle diffusion took place concurrently (Ghorai et al, 2013).…”

Section: Adsorption Kineticsmentioning

confidence: 99%

Adsorption of methylene blue onto Fe3O4/activated montmorillonite nanocomposite

Chang

et al. 2016

Applied Clay Science

307

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Effective removal of Congo red dye from aqueous solution using modified xanthan gum/silica hybrid nanocomposite as adsorbent

Cited by 244 publications

References 32 publications

Synthesis, characterization and adsorption studies of an acrylic acid-grafted sodium alginate-based TiO₂hydrogel nanocomposite

Synthesis, characterization and adsorption studies of an acrylic acid-grafted sodium alginate-based TiO₂hydrogel nanocomposite

Novel tunable composites based on bentonite and modified tragacanth gum for removal of acid dyes from aqueous solutions

Adsorption of methylene blue onto Fe3O4/activated montmorillonite nanocomposite

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Effective removal of Congo red dye from aqueous solution using modified xanthan gum/silica hybrid nanocomposite as adsorbent

Cited by 244 publications

References 32 publications

Synthesis, characterization and adsorption studies of an acrylic acid-grafted sodium alginate-based TiO2hydrogel nanocomposite

Synthesis, characterization and adsorption studies of an acrylic acid-grafted sodium alginate-based TiO2hydrogel nanocomposite

Novel tunable composites based on bentonite and modified tragacanth gum for removal of acid dyes from aqueous solutions

Adsorption of methylene blue onto Fe3O4/activated montmorillonite nanocomposite

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Synthesis, characterization and adsorption studies of an acrylic acid-grafted sodium alginate-based TiO₂hydrogel nanocomposite

Synthesis, characterization and adsorption studies of an acrylic acid-grafted sodium alginate-based TiO₂hydrogel nanocomposite