Biosorption of lead (II) from aqueous solution by a bacterial dead Streptomyces rimosus biomass

Potential of Staphylococcus xylosus strain for recovering nickel ions from aqueous solutions

“…Similar findings were also reported with different bacterial species and metal ions [1,4]. The high concentration of the biomass lead to the agglomeration of these cells which effect negatively on the removal process due to the decreasing in the surface area exposed to the metal ions even in the presence high concentrations of these ions [11]. The high efficiency of dead cells in comparison with the living cells might be explained based on the absence of competing protons produced during metabolism [12].…”

“…Therefore, the increasing of temperature associated with the increasing of removal efficiency. Selatnia et al [11] reported that the adsorption generally increase with decrease in temperature and the physical adsorption reactions are normally exothermic. In the present study, the recovery efficiency correlated with the increasing of temperature from 20 to 37ºC and then reduced significantly when the temperature raised to 45 and then 55ºC.…”

Lead biosorption onto waste beer yeast by-product, a means to decontaminate effluent generated from battery manufacturing industry

“…have been reported by Cruz et al (2004) and Martins et al (2006), respectively. Lower metal uptake at higher agitation speeds beyond a point is attributed to non-homogeneity of the biosorption mixtures (Selatnia et al 2004) as a result of vortex phenomenon. Highest uptake of lead at an agitation speed of 150 rpm observed during the study indicates that the system experienced least mass transfer resistance.…”

Adsorção de chumbo, cádmio e prata em óxido de nióbio (V) hidratado preparado pelo método da precipitação em solução homogênea

“…1 Novos materiais adsorventes têm despertado grande interesse no meio científico. Diversos trabalhos têm mostrado o estudo com materiais adsorventes para cátions e ânions destacando-se: quitosana, 2 argilas, 3 zeólitas, 4 levedura, 5 bactérias, [6][7][8] carvão ativado, 9 bagaço de cana-de-açúcar, 10 resíduos agroindustriais 11 e compósitos. 12 Os óxidos metálicos hidratados são importantes trocadores iônicos inorgânicos, pois apresentam os requisitos de seletividade e estabilidade necessários à troca iônica, bem como são de fácil preparação e, em geral, com menores custos quando comparados às resinas orgânicas.…”