Application of coal fly ash for treatment of wastewater containing a binary mixture of copper and nickel

Lekgoba, Tumeletso; Ntuli, Freeman; Falayi, Thabo

doi:10.1016/j.jwpe.2020.101822

Cited by 14 publications

(13 citation statements)

References 33 publications

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“…A variety of traditional techniques for water treatment have been shown to be capable of removing copper from wastewater, including chemical precipitation, membrane filtration and ion exchange [3]. Adsorption can be explained as a separation process in which the components of a fluid phase are transferred to the surface of a solid material [4,5]. The adsorption process is the most used technique due to its efficiency and simplicity [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Removal of Toxic Copper Ion from Aqueous Media by Adsorption on Fly Ash-Derived Zeolites: Kinetic and Equilibrium Studies

2021

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This study investigated the adsorption capacity of one material based on the treatment of fly ash with sodium hydroxide as a novel adsorbent for toxic Cu2+ ion removal from aqueous media. The adsorbent was obtained through direct activation of fly ash with 2M NaOH at 90 °C and 6 h of contact time. The adsorbent was characterized by recognized techniques for solid samples. The influence of adsorption parameters such as adsorbent dose, copper initial concentration and contact time was analyzed in order to establish the best adsorption conditions. The results revealed that the Langmuir model fitted with the copper adsorption data. The maximum copper adsorption capacity was 53.5 mg/g. The adsorption process followed the pseudo-second-order kinetic model. The results indicated that the mechanism of adsorption was chemisorption. The results also showed the copper ion removal efficiencies of the synthesized adsorbents. The proposed procedure is an innovative and economical method, which can be used for toxicity reduction by capitalizing on abundant solid waste and treatment wastewater.

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Section: Introductionmentioning

confidence: 99%

Removal of Toxic Copper Ion from Aqueous Media by Adsorption on Fly Ash-Derived Zeolites: Kinetic and Equilibrium Studies

2021

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“…In a diffractometric pattern, sharp peaks represent crystalline phases while amorphous phases are shown by broad peaks (Kapur and Mondal, 2014;Lekgoba et al, 2020). Figure 1 shows that morula biochar is amorphous and both activated and raw fly ash are showing a similar diffractometric pattern which suggests that the activation of morula char did not effect any changes in the diffraction pattern.…”

Section: Mineral Composition (Xrd)mentioning

confidence: 97%

Sequestration of Heavy Metals From Coal Wash Water Using Biochar From Pyrolysis of Morula Shells

Othugile

Lekgoba

Ntuli

2021

EUR J SUSTAIN DEV RES

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Biomass is a source of low-cost adsorbents used in the removal of contaminants. In this study, shells from an indigenous tree in Southern Africa called Morula were pyrolyzed to produce biochar that was used to sequester heavy metals from coal wash water. The produced biochar was activated using hydrochloric acid (HCl) and parameters such as the cation exchange capacity (CEC), point of zero charge (pHzc), elemental composition, mineral composition, proximate analysis and surface functional groups were determined. Batch adsorption experiments were carried out at 150 rpm for 60 min and 25 ºC at different metal ion concentrations and adsorbent dosages. The metal ions of interest were Zn, Ni and Fe and it was found that Fe recorded higher removals for both raw and activated biochar. Generally higher removals were noticed for both raw and activated at lower dosages (0.2 -1.0 g/100 mL) and lower metal ion concentration (between 40 and 60 ppm) while lower removals were found at higher dosages (1 -5 g/100 mL) and higher metal ion concentrations (between 400 -600 ppm).

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“…The leachability of the adsorbent was tested using distilled water at pH 6.8 as per Lekgoba et al (2020). In this study, the agitation times were 24, 48 and 72 h and the analysis of the filtrates was done using ICP-OES.…”

Section: Ionic Leaching and Ph Point Of Zero Charge (Phpzc)mentioning

confidence: 99%

“…The Root Mean Square Error (RMSE) analysis along with a coefficient of determination (R 2 ) was employed to select the suitable kinetic of the adsorption process. RMSE was expressed as descried by Lekgoba et al (2020) according to Eq. (3).…”

Section: Fitness Of Kinetic Modelsmentioning

confidence: 99%

Investigation of clay brick waste for the removal of copper, nickel and iron from aqueous solution: batch and fixed – bed column studies

Mokokwe

Letshwenyo²

2022

Heliyon

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Application of coal fly ash for treatment of wastewater containing a binary mixture of copper and nickel

Cited by 14 publications

References 33 publications

Removal of Toxic Copper Ion from Aqueous Media by Adsorption on Fly Ash-Derived Zeolites: Kinetic and Equilibrium Studies

Removal of Toxic Copper Ion from Aqueous Media by Adsorption on Fly Ash-Derived Zeolites: Kinetic and Equilibrium Studies

Sequestration of Heavy Metals From Coal Wash Water Using Biochar From Pyrolysis of Morula Shells

Investigation of clay brick waste for the removal of copper, nickel and iron from aqueous solution: batch and fixed – bed column studies

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