Biosolids-based activated carbon for enhanced copper removal from citric-acid-rich aqueous media

Nicomel, Nina Ricci; Li, Loretta Y.; Laing, Gijs Du

doi:10.1007/s11356-022-21020-4

Cited by 6 publications

(1 citation statement)

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“…The yield calculated for KBS is 33.25%, which is better than the reported literature on single-stage ACs from biosolids [ 20 ]. There is a significant improvement in the surface area, increasing from 0.010 to 156.56 m 2 /g, and pore volume, from 0.021 to 0.235 cm 3 /g, upon activation ( Figure S1 ), better than some reported studies [ 21 ].…”

Section: Resultsmentioning

confidence: 53%

Removal of Methylene Blue from Water Using Magnetic GTL-Derived Biosolids: Study of Adsorption Isotherms and Kinetic Models

et al. 2023

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Global waste production is significantly rising with the increase in population. Efforts are being made to utilize waste in meaningful ways and increase its economic value. This research makes one such effort by utilizing gas-to-liquid (GTL)-derived biosolids, a significant waste produced from the wastewater treatment process. To understand the surface properties, the biosolid waste (BS) that is activated directly using potassium carbonate, labelled as KBS, has been characterized using scanning electron microscopy and energy dispersive X-ray spectroscopy (SEM-EDS), X-ray photoelectron spectroscopy (XPS), X-ray powder diffraction (XRD), and Brunauer–Emmett–Teller (BET). The characterization shows that the surface area of BS increased from 0.010 to 156 m2/g upon activation. The EDS and XPS results show an increase in the metal content after activation (especially iron); additionally, XRD revealed the presence of magnetite and potassium iron oxide upon activation. Furthermore, the magnetic field was recorded to be 0.1 mT using a tesla meter. The magnetic properties present in the activated carbon show potential for pollutant removal. Adsorption studies of methylene blue using KBS show a maximum adsorption capacity of 59.27 mg/g; the adsorption process is rapid and reaches equilibrium after 9 h. Modelling using seven different isotherm and kinetic models reveals the best fit for the Langmuir-Freundlich and Diffusion-chemisorptionmodels, respectively. Additional thermodynamic calculations conclude the adsorption system to be exothermic, spontaneous, and favoring physisorption.

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Section: Resultsmentioning

confidence: 53%