Removal of Cr(VI) from Aqueous Solutions Using Powder of Potato Peelings as a Low Cost Sorbent

Abstract

Potato peels which are a low cost, renewable agroindustry by-product were used for the removal of hexavalent chromium from aqueous effluents. Batch experiments were carried out with an artificial effluent comprising of potassium dichromate in deionised water. The effects of the initial hexavalent chromium concentration, dose of biosorbent, and removal kinetics were explored. An adsorbent dosage of 4 g/L was effective in complete removal of the metal ion, at pH 2.5, in 48 minutes. The kinetic process of Cr(VI) adsorption onto potato peel powder was tested by applying pseudo-first-order and pseudo-second-order models as well as the Elovich kinetic equation to correlate the experimental data and to determine the kinetic parameters. The adsorption data were correlated by the Langmuir and Freundlich isotherms. A maximum monolayer adsorption capacity of 3.28 mg/g was calculated using the Langmuir adsorption isotherm, suggesting a functional group limited adsorption process. The results confirmed that potato peels are an effective biosorbent for the removal of hexavalent chromium from effluent.

Removal of Chromium Cr(Vi) of Tanning Effluent with Activated Carbon from Tannery Solid Wastes

“…It is clear that uptake of iodine in aqueous solution were improved during the transformation process of raw materials into ACs. However, in these tables, we observe for all the samples that the amount of iodine adsorbed increases significantly with increase of temperature and activation residence time during preparation, except for ACs obtained for temperature up to 800°C and the residence time equal to 90 min, AC 4 and AC 8 for which the iodine numbers are about 190 mg/g. For the sample prepared by the residence time less than or equal to 60 min the adsorption capacity is higher, meaning that ACs prepared contained an important amount of micropores.…”

“…For samples AC 4 and AC 8 , increasing temperature and residence time widens micropores to give mesopores or macropores. Sample AC 3 and AC 6 show highest values of iodine; this allows us to calculate their surface area and pore volume using BET analysis, Table 3.…”

“…For instance chromium-collagen wastes were used to remove tannins from wastewater [2], the diatom Planothidium lanceolatum (Brébisson) Lange-Bertalot (P. lanceolatum) was used for biosorption of hexavalent chromium [Cr (VI)] from aqueous solutions [3], powder of potato peelings [4] and an activated carbon prepared from coconut tree sawdust [5] were also used as adsobents for removal of chromium [Cr (VI)] from aqueous solution, while leather waste was employed as adsorbent to remove dye from solution [6]. In this work, the solid waste from the tanneries is transformed into active carbon in order to enhance its adsorbent capacity for the chromium (VI) ions removal.…”

Adsorption of Cr(Vi) Ion from Aqueous Solutions by Solid Waste of Potato Peels

“…3). A possible explanation for this might be attributed that no sufficient surface sites available to adsorb more chromium ions from the solution (Mutongo et al, 2014). The ratio of available active sites to the total Cr(VI) ions in the solution is high at low concentration, therefore, all ions can interact with PP and are adsorbed rapidly from the solution.…”

Evaluación De Residuos Agroindustriales Como Biofiltros: Remoción De Cr (Vi) en Efluentes De Curtiembres Sintéticos

“…Estudios previos han presentado resultados de bioadsorción de metales pesados empleando materiales biológicos. Entre algunos de ellos está: cascarilla de arroz [22], cascarilla de café [23], cáscara de papa [24], quitosan de camarón [25], cenizas volantes y catalizador FCC (Catalizador gastado craqueo catalítico) [26,27], corteza de papaya [28], cáscara de huevo [29], cascarilla de garbanzo [30], cortezas de plátano (Musa AAA) [31] y cortezas de naranja (Citrus sinensis) [15]. Todos con eficiencias de remoción de metales pesados en rangos de 70 a 98%.…”