Adsorptive removal of organics from aqueous phase by acid-activated coal fly ash: preparation, adsorption, and Fenton regenerative valorization of “spent” adsorbent

Adsorption of Pb(II) ions onto selective adsorbent of dithizone-immobilized coal fly ash (DCFA) from Holcim, Cilacap, Indonesia has been investigated in batch experiments. Prepared coal fly ash (CFA) modified by immobilization of dithizone previously were characterized by FT-IR and XRD. Several parameters influencing the adsorption of Pb(II) ions such as effect of pH, adsorbent dosage, contact time and initial concentration of ions on the efficiency of the adsorption were studied. The optimum condition of Pb(II) adsorption was found at pH 5, adsorbent dosage 0.1 g, contact time 60 min and initial Pb(II) ions concentration of 60 mg L–1. The adsorption kinetics of Pb(II) ions on DCFA was found to follow a pseudo-second-order kinetic model. The adsorption isotherm data were fitted to the Langmuir model. Kinetics and adsorption isotherm studies suggest that the capacity and affinity of the DCFA in adsorbing Pb(II) ions is significantly improved compared to those of non-immobilized activated coal fly ash (ACFA).

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Removal of sulfonated humic acid from aqueous phase by modified coal fly ash waste: Equilibrium and kinetic adsorption studies

Fuel ◽

10.1016/j.fuel.2015.10.069 ◽

2016 ◽

Vol 165 ◽

pp. 264-271 ◽

Cited By ~ 65

Author(s):

Chunjiang An ◽

Siqi Yang ◽

Guohe Huang ◽

Shan Zhao ◽

Peng Zhang ◽

...

Keyword(s):

Fly Ash ◽

Humic Acid ◽

Aqueous Phase ◽

Coal Fly Ash ◽

Kinetic Adsorption ◽

Adsorption Studies

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Possibilities of Using Alternative Materials as a Substitute Binder or Filler into Composites

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1105.31 ◽

2015 ◽

Vol 1105 ◽

pp. 31-35 ◽

Cited By ~ 1

Author(s):

Nadežda Števulová ◽

Ivana Schwarzova ◽

Viola Hospodarova ◽

Jozef Junak ◽

Marcela Ondova ◽

...

Keyword(s):

Compressive Strength ◽

Fly Ash ◽

Coal Fly Ash ◽

Steel Slag ◽

Recycled Concrete ◽

Partial Replacement ◽

Alternative Materials ◽

Activated Coal ◽

Hemp Fibres ◽

Lightweight Composites

This article reports on the possibilities of using selected alternative materials like hemp fibres, MgO-cement, recycled concrete, fly ash and steel slag as binder or filler replacement in composite materials in civil engineering production. These binder or filler substitutes were mixed into composites and their compressive strength was tested. The paper is divided into four parts providing the results of experiments. In first part strength parameters of lightweight composites based on natural fibres (hemp hurds) and alternative binder (MgO-cement) are presented. Compressive strength values of concrete samples with partial replacement of cement with mechanochemically activated coal fly ash are given. The third and forth part is aimed to utilization of recycled concrete and steel slag as a natural aggregate replacement in concrete mixture for purpose of structural concrete and surface roads.

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Preparation of sintered foam materials by alkali-activated coal fly ash

Journal of Hazardous Materials ◽

10.1016/j.jhazmat.2009.09.023 ◽

2010 ◽

Vol 174 (1-3) ◽

pp. 108-112 ◽

Cited By ~ 54

Author(s):

Yelong Zhao ◽

Junwei Ye ◽

Xiaobin Lu ◽

Mangang Liu ◽

Yuan Lin ◽

...

Keyword(s):

Fly Ash ◽

Coal Fly Ash ◽

Activated Coal ◽

Alkali Activated

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A novel nickel catalyst supported on activated coal fly ash for syngas production via biogas dry reforming

Renewable Energy ◽

10.1016/j.renene.2019.12.096 ◽

2020 ◽

Vol 149 ◽

pp. 786-793 ◽

Cited By ~ 6

Author(s):

Yuchen Gao ◽

Jianguo Jiang ◽

Yuan Meng ◽

Aikelaimu Aihemaiti ◽

Tongyao Ju ◽

...

Keyword(s):

Fly Ash ◽

Nickel Catalyst ◽

Coal Fly Ash ◽

Dry Reforming ◽

Syngas Production ◽

Activated Coal

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Adsorptive removal of methylene blue from aqueous solution using coal fly ash-derived mesoporous silica material

Adsorption Science & Technology ◽

10.1177/0263617419827438 ◽

2019 ◽

Vol 37 (3-4) ◽

pp. 333-348 ◽

Cited By ~ 12

Author(s):

Ning Yuan ◽

Hui Cai ◽

Tian Liu ◽

Qi Huang ◽

Xinling Zhang

Keyword(s):

Aqueous Solution ◽

Methylene Blue ◽

Fly Ash ◽

Mesoporous Silica ◽

Coal Fly Ash ◽

Nitrogen Adsorption ◽

Mesoporous Silica Material ◽

Adsorptive Removal ◽

Silica Material ◽

Adsorption Desorption

In the present work, coal fly ash-derived mesoporous silica material (CFA-MS) has been successfully fabricated without employing any extra silica source. The obtained CFA-MS was characterized by Fourier transform infrared spectroscopy, nitrogen adsorption–desorption measurement, powder X-ray diffraction and transmission electron microscopy. Nitrogen adsorption–desorption measurement disclosed that CFA-MS possesses Brunauer–Emmett–Teller-specific surface area of 497 m2·g−1 and pore volume of 0.49 cm3·g−1, respectively. Furthermore, CFA-MS was evaluated for the adsorptive removal of methylene blue from aqueous solution. Several influence parameters on the removal of methylene blue including contact time, pH, initial concentration and temperature were studied in detail. Moreover, Langmuir, Freundlich, Temkin and Dubinin-Radushkevich isotherm models were employed for interpretation of the adsorption process, while the pseudo-first-order and pseudo-second-order kinetics equations were applied to investigate the adsorption kinetics. Results in the current work demonstrate that CFA-MS can be used as an efficient adsorbent for methylene blue removal.

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