Remoção de íons cromo provenientes da indústria de galvanoplastia através da biossorção

• Ano de defesa: 2015
• Autor(a) principal: Oliveira, Edipo Silva de
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Palavras-chave em Português: Cromo; Biossorção; Pseudocaule de bananeira
• Link de acesso: http://www.repositorio.ufc.br/handle/riufc/47929

The removal of metals based on adsorption techniques, specifically using biomass (biosorption), has been presented as a promising alternative to solve the problem, due to the natural affinity that biological compounds have the metallic elements. The biosorption emerges as an alternative or supplementary process due to features such as the low price of biosorbent material, application systems capable of purifying large volume of effluent with operating low cost, possible selectivity and recovery of metal species. This work aims at the application of the fiber of the banana pseudostem as biosorbent for the removal of chromium ions (emphasis on hexavalent chromium) of the liquid effluent from the electroplating industry. The fiber was dried and milled previously used in the manufacture of a filter element. We developed a wastewater purification system where the filter is used and it was evaluated parameters as the influence of pH on the adsorption, the effect of contact time and the adsorption capacity by adsorption isotherms. In pH testing, the pH was determined that the performance of adsorbing ions of chromium banana pseudostem by the fiber is in the range of 1,5. In evaluating the effect of contact time, it was observed that after 10 minutes of adsorption, banana pseudostem fiber has its maximum saturated adsorption. For linear models of Langmuir adsorption isotherms, it was determined that the maximum capacity for adsorption of hexavalent chromium to the K2Cr2O7 solution was 7,22 mg g-1 and for effluent from the electroplating industry was 7,87 mg g-1. Comparing the linear model Langmuir and Freundich adsorption isotherms, it is observed that the process may involve both physisorption (observed in multilayer adsorption) and chemisorption (observed in monolayer adsorption).