Hexavalent chromium adsorption from aqueous solution utilizing activated carbon developed from Rumex abyssinicus

Abewaa, Mikiyas; Arka, Andualem; Haddis, Tigabu; Mengistu, Ashagrie; Takele, Temesgen; Adino, Eba; Abay, Yordanos; Bekele, Naol; Andualem, Getaneh; Girmay, Haftom

doi:10.1016/j.rineng.2024.102274

Cited by 8 publications

(2 citation statements)

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“…The pH of biochar was determined using a method for testing the pH of waste materials (EN 12457-2:2002). The point of zero charge (pH pzc ) was used to characterize the surface acidity and alkalinity of the activated carbon 16 .…”

Section: Methodsmentioning

confidence: 99%

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Influence of lignin and cellulose from termite-processed biomass on biochar production and evaluation of chromium VI adsorption

Kopp Alves,

Hauschild,

Basegio

et al. 2024

Sci Rep

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The increasing water contamination by toxic heavy metals, particularly hexavalent chromium, has become a significant environmental concern. This study explores the pyrolysis of termite-processed biomass, specifically Pinuselliottii particleboard and its termite droppings (TDs), to produce biochar and its application for chromium (VI) adsorption. Termite droppings, rich in lignin, and particleboard, rich in cellulose, were pyrolyzed at various temperatures to assess the effect of biomass composition on biochar properties. The study found that lignin-rich termite droppings produced biochar with higher fixed carbon content and specific surface area than cellulose-rich particleboard biochar. FTIR and Raman spectroscopy revealed significant molecular structure changes during pyrolysis, which influenced the adsorption capabilities of the biochar. Adsorption experiments demonstrated that TD biochar exhibited significantly higher chromium (VI) adsorption capacity, attributed to its distinct chemical composition and enhanced surface properties due to higher lignin content. These findings underscore the crucial role of lignin in producing efficient biochar for heavy metal adsorption, highlighting the practical applicability of termite-processed biomass in water purification technologies.

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Section: Methodsmentioning

confidence: 99%

“…The Langmuir and Freundlich isotherm models were applied to evaluate the fitness of the data and to determine whether the adsorbent surfaces were homogeneous or heterogeneous 16 . The Langmuir isotherm model assumes that adsorbates form a monolayer on binding sites.…”

Section: Methodsmentioning

confidence: 99%