Evaluation of the use of modified coal ash as a potential sorbent for organic waste streams

Woolard, C. D.; Strong, Peter James; Erasmus, C.R.

doi:10.1016/s0883-2927(02)00057-4

Cited by 180 publications

(51 citation statements)

References 15 publications

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“…These data depicted that the removal of impurities in fly ash increased adsorption capacity by 62.70 %. Compared to the study by Woolard et al [15], the adsorption capacity of MB by the amorphous SG at room temperature was 22.66 mg.g -1 , this present study SG from FA can be classified as a good potential adsorbent.…”

Section: Isothermal Adsorptioncontrasting

confidence: 80%

“…The kinetics of adsorption was calculated based on experimental results of the variation of the interaction time (15,30,45,60, and 90 minutes) between 200 mg.L -1 of Methylene Blue and 10 mg adsorbent Fly Ash and Silica Gels. The mixture was filtered, and the filtrate was measured as a residual concentration of MB that was not absorbed by the adsorbent.…”

Section: Kinetics Of Adsorptionmentioning

confidence: 99%

“…The influence of adsorption time was carried out by interacting methylene blue with the concentration of 200 mg.L -1 and adsorbent (fly ash and silica gels) using a variation of the concentration of 15,30,45,60, and 90 minutes. The adsorbed concentration of the methylene blue in the adsorbent material is shown in Figure 9.…”

Section: The Kinetics Adsorptionmentioning

confidence: 99%

“…Moreover, fly ash contains chemical compounds such as SiO2 64.97 %; Al2O3 26.64 %; Fe2O3 5.69 %; CaO 0.33 %; and MgO 0.85 % [12]. The adsorption capacity of the MB by raw fly ash varies from 12.7 mg.g -1 [13], 4.60 mg.g -1 [14], to 1.11 mg.g -1 [15]. Those sorption capacities are not sufficient to solve the MB problems, and therefore, it is necessary to find a more potential adsorbent based on FA.…”

Section: Introductionmentioning

confidence: 99%

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Silica Gels from Coal Fly Ash as Methylene Blue Adsorbent: Isotherm and Kinetic Studies

Sulistiyo

Andriana

Piluharto

et al. 2017

Bull. Chem. React. Eng. Catal.

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A lot of dye pollutants were released in the aquatic environment as waste from industrial coloring process. This research aimed to study silica gels (SG) as a potential adsorbent to remove the dyes. The SG can be synthesized from coal fly ash (FA), which is industrial solid waste rarely utilized, using the sol-gel method. Its properties were then characterized by FTIR, XRD, SEM, and isothermal ads-des N2.As a result, FTIR spectra and XRD diffractogram exhibited the successfully SG synthesized from FA with the amorphous structure. The image analysis using SEM demonstrated that SG particles are spherical. The isotherm type, based on isotherm ads-des N2, is type II without hysteresis loop which represents the nonporous material SG with the surface area and pore diameter of 25.977 m 2 /g and 1.52 nm, respectively. The adsorption capacity performance of SG to remove methylene blue (MB) as a basic dye is 62.70 % which is higher than FA, following Langmuir isotherm adsorption model. The kinetics of adsorption rate of SG are based on the pseudo second order models accelerated by 3.37 times faster than FA.

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Section: Isothermal Adsorptioncontrasting

confidence: 80%

Section: Kinetics Of Adsorptionmentioning

confidence: 99%

Section: The Kinetics Adsorptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Silica Gels from Coal Fly Ash as Methylene Blue Adsorbent: Isotherm and Kinetic Studies

Sulistiyo

Andriana

Piluharto

et al. 2017

Bull. Chem. React. Eng. Catal.

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“…much higher uptake capacity of MB, compared with the adsorbents that were reported. [74][75][76][77][78][79][80][81][82][83][84][85][86][87] On the basis of the above observations and the characteristics of Fe 3 O 4 /GO-NH 2 /H 3 PMo 12 O 40 nanocomposite, we infer that the following factors could contribute to the increased adsorption capacity of this nanocomposite. On the one hand, the anchored aminopropyl groups and the presence of the well dispersed Fe 3 O 4 and H 3 PMo 12 O 40 nanoparticles on the GO nanosheets surface could act as spacers and thus prohibit the graphene sheets to restack.…”

Section: The Reusability and Stability Of The Hybrid Nanomaterialsmentioning

confidence: 75%

Magnetically Recyclable Fe3O4/GO-NH2/H3PMo12O40 Nanocomposite: Synthesis, Characterization, and Application in Selective Adsorption of Cationic Dyes from Water

Farhadi¹,

Hakimi²,

Maleki³

2017

ACSi

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In this study, the PMo 12 O 40 3− polyanion was immobilized chemically on amino functionalized magnetic graphene oxide nanosheets. The as-prepared ternary magnetic nanocomposite (Fe 3 O 4 /GO-NH 2 /H 3 PMo 12 O 40 ) was characterized by powder X-ray powder diffraction (XRD), fourier transformation infrared spectroscopy (FTIR), Raman spectroscopy, energy dispersive spectroscopy (EDX), field emission scanning electron microscopy (FESEM), BET surface area measurements, magnetic measurements (VSM) and atomic force microscopy (AFM). The results demonstrated the successful loading of H 3 PMo 12 O 40 (~36.5 wt.%) on the surface of magnetic graphene oxide. The nanocomposite showed a higher specific surface area (77.07 m 2 /g) than pure H 3 PMo 12 O 40 (≤10 m 2 /g). The adsorption efficiency of this nanocomposite for removing methylene blue (MB), rhodamine B (RhB) and methyl orange (MO) from aqueous solutions was evaluated. The nanocomposite showed rapid and selective adsorption for cationic dyes from mixed dye solutions. The adsorption rate and capacity of Fe 3 O 4 /GO-NH 2 /H 3 PMo 12 O 40 were enhanced as compared with GO, GO-NH 2 , Fe 3 O 4 /GO-NH 2 , and H 3 PMo 12 O 40 samples due to enhanced electrostatic attraction and hydrogen-bonding interactions. The nanocomposite is magnetically separated and reused without any change in structure. Thus, it could be a promising green adsorbent for removing organic pollutants in water.

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Non‐Conventional Adsorbents for Dye Removal

Crini¹

2015

Green Chemistry for Dyes Removal From Wastewater

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Evaluation of the use of modified coal ash as a potential sorbent for organic waste streams

Cited by 180 publications

References 15 publications

Silica Gels from Coal Fly Ash as Methylene Blue Adsorbent: Isotherm and Kinetic Studies

Silica Gels from Coal Fly Ash as Methylene Blue Adsorbent: Isotherm and Kinetic Studies

Magnetically Recyclable Fe3O4/GO-NH2/H3PMo12O40 Nanocomposite: Synthesis, Characterization, and Application in Selective Adsorption of Cationic Dyes from Water

Non‐Conventional Adsorbents for Dye Removal

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