Coal-based adsorbents for water and wastewater treatment

Simate, Geoffrey S.; Maledi, Nthabiseng; Ochieng, Aoyi; Ndlovu, Sehliselo; Jun, Zhang; Walubita, Lubinda F.

doi:10.1016/j.jece.2016.03.051

Cited by 68 publications

(36 citation statements)

References 160 publications

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“…An energy‐efficient way is using adsorbent materials for this task, and among these a promising class is carbon‐based materials. Due to their π–electrons and their high surface area, carbon‐based materials are capable of adsorbing a lot of unwanted organic substances from water . Yet, to be most efficient, the adsorbent material should ideally be finely distributed in the water body as this would mean short diffusion paths for the target substances toward the active adsorbent surface.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Carbon Composite Particles for Dye Adsorption from Water and their Electrochemical Regeneration

Schneider

Ballweg

Groß

et al. 2019

Part & Part Syst Charact

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Herein, the development of a novel composite particle system prepared from superparamagnetic Fe3O4@SiO2 microparticles as core and coated with a carbon shell is presented. The coating with carbon is done by pyrolyzing furan resin, which was previously deposited on the particle surface by poly‐merization of furfuryl alcohol. The novel composite material thus combines magnetic and sorptive properties. Upon pyrolysis the magnetic material is converted from magnetite to α‐iron and fayalite, changing its behavior from superparamagnetic to ferromagnetic with nearly zero remanence. The magnetic properties can be utilized to magnetically collect the particles dispersed in fluids, whereas the sorptive properties of the carbon shell can be used to remove organic contaminants from these fluids. The adsorption behavior of the composite particles and a potential electrochemical regeneration route are investigated, using the model dye methylene blue.

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Section: Introductionmentioning

confidence: 99%

Magnetic Carbon Composite Particles for Dye Adsorption from Water and their Electrochemical Regeneration

Schneider

Ballweg

Groß

et al. 2019

Part & Part Syst Charact

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“…On the other hand, activated carbon can be used to adsorb and remove organic components in ROC of seawater desalination [8]. On the other hand, activated carbon is expensive and difficult to regenerate, while coal is not only cheap but also has much higher surface utilization efficiency than traditional activated carbon [9]. Coal-based adsorbents are not only suitable for the adsorption of natural organic matter [10] but also for the adsorption of polycyclic aromatic hydrocarbon compounds [11,12].…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Organic Constituents from Reverse Osmosis Concentrate in Coal Chemical Industry by Coking Coal

Qin

Zhang

et al. 2019

Processes

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To solve the unwieldy problem of coal chemical wastewater reverse osmosis concentrate (ROC), a novel treatment method in which coking coal was used to adsorb the organic from ROC and the adsorption mechanism involved was investigated. The results showed that the organic components in the ROC of coal chemical industry can be effectively absorbed by the coking coal and the total organic carbon, UV254 and chromaticity of treated ROC reduced by 70.18%, 70.15% and 59.55%, respectively, at the coking coal dosage of 80 g/L. The isothermal adsorption data were fitted to the Langmuir model well. The kinetics were expressed well by the quasi-second-order kinetic model. The intragranular diffusion model and the BET (Acronym for three scientists: Brunauer–Emmett–Teller) test showed that the adsorption occurred mainly on the surface of the coking coal and its macropores and mesopores. When the pollutants further diffused to the mesopores and micropores, the adsorption rate decreased. The result of X-ray photoelectron spectroscopy and fourier transform infrared spectroscopy spectra showed that the coking coal mainly adsorbed the nitrogen and oxygen species and the halogenated hydrocarbon organic compounds in the ROC. The chlorinated hydrocarbons and heterocyclic organics in ROC are adsorbed on the surface of coking coal.

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“…Água vol. 13 n.4, e2224 -Taubaté 2018 Activated coal has been widely used to remove contaminants from residual water due to its large surface area and excellent capacity for adsorption of these composites; however, the high cost has limited its usage (Simate et al, 2016;Mor et al, 2017). This fact aroused interest to develop other low cost products using the residue generated in coal thermal electrical plants (ashes) as raw material for the production of adsorbent (Attari et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Use of zeolite synthesized from coal ashl from Santa Catarina for removal of iron, manganese and methylene blue dye in water

2018

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The fly ash of coal, generated in a thermoelectric plant, was used to synthesize zeolite by hydrothermal treatment with a sodium hydroxide solution. The zeolite synthesized was used as an adsorbent of metals (Fe and Mn) and of the methylene blue dye in water. The characterization of the zeolite showed that silicon oxide is the main compound in its composition, followed by aluminum, iron, sodium and calcium, which together correspond to more than 86% of its composition. These were used to investigate the kinetic parameters of adsorption and the isotherm of the metals and the methylene blue dye in aqueous solutions. Three kinetic models, pseudo-first order, pseudo-second order and intraparticle diffusion were used to predict adsorption rate constants. The adsorption kinetics of the dye and metals followed the pseudo-second order kinetics and reached equilibrium in 15 minutes with a 99% removal rate for metals, independently of the pH. The values of the diffusion constants (K2) for iron in pH 5, 7 and 8 were 1.3158; 1.3881 e 0.6053 mg.g-1.min-1 and for manganese 1.2511; 1.5239 and 1.4336 mg.g-1.min-1, respectively. For methylene blue, the removal rate was 90% and the constant (K2) value was 0.5437 mg.g-1.min-1. The studies showed the existence of different stages in the adsorption of the metals and the methylene blue dye in zeolite.

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Coal-based adsorbents for water and wastewater treatment

Cited by 68 publications

References 160 publications

Magnetic Carbon Composite Particles for Dye Adsorption from Water and their Electrochemical Regeneration

Magnetic Carbon Composite Particles for Dye Adsorption from Water and their Electrochemical Regeneration

Adsorption of Organic Constituents from Reverse Osmosis Concentrate in Coal Chemical Industry by Coking Coal

Use of zeolite synthesized from coal ashl from Santa Catarina for removal of iron, manganese and methylene blue dye in water

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