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Potencial da casca da laranja como biossorvente alternativo para remoção de metais pesados em águas residuais

Orange peel biosorbent potential as an alternative for removing heavy metals from wastewater

Souza, Wallas Douglas de Macêdo; Alves, Janete Jane Fernandes; Oliveira, Thiago Mielle Brito Ferreira; Oliveira, Daniele da Silva;

Completo:

A poluição dos recursos hídricos e os respectivos impactos socioambientais constituem motivo de preocupação mundial, em virtude da ascendente escassez deste recurso associada ao elevado custo energético e financeiro atrelado ao seu tratamento. Um dos poluentes mais preocupantes e frequentes são os metais pesados, por serem altamente tóxicos para a saúde dos seres vivos e capazes de inviabilizar a utilização da água para diferentes fins. Como alternativa, várias técnicas de tratamento têm sido propostas para a remoção de metais de águas naturais, com destaque para as tecnologias de adsorção por troca iônica. A utilização de biossorventes obtidos a partir da casca e do mesocarpo de diferentes frutos (laranja, limão, banana, fibra de coco verde, entre outros), tem mostrado resultados bastante promissores. O presente trabalho apresenta uma revisão acerca da viabilidade da casca da laranja no processo de biossorção, por conta do alto potencial da biomassa não comestível deste fruto para o processo de troca iônica. Em linhas gerais, estudos revelam que a casca da laranja pode ser utilizada em substituição ao carvão ativado comercial, que possui alto custo, mas que ainda é a técnica mais empregada para a remoção de metais em águas contaminadas. A modificação química da casca da laranja também tem mostrado excelentes resultados para a adsorção dos íons metálicos, porém estudos toxicológicos ainda necessitam ser realizados acerca dos riscos de contaminação com compostos secundários.

Completo:

The pollution of water resources and the environmental impacts are a global concern, due to the rising scarcity of this resource associated to the high energetic and financial costs associated to their treatment. One of the most worrying and frequent pollutants are heavy metals, because they are highly toxic for living beings and capable of make the water unusable for different purposes. Alternatively, several treatment techniques have been proposed for removal of natural waters metals, highlighting the adsorption technologies for ion exchange. The use of the biosorbents derived from mesocarp of the shell of different fruits (orange, lemon, banana, coconut fiber, among others), have shown very promising results. This paper presents a review of using orange peel viability in the biosorption process, due to the high potential of its fruit inedible biomass for the ion exchange process. In general, studies show that orange peel can be used to replace the activated charcoal trade, that has a high cost, but it is still the most used technique for the removal of metals from contaminated waters. The chemical modification of the orange peel has also shown excellent results for the adsorption of metal ions, however toxicological studies still need to be made about the contamination risks by secondary compounds.

Palavras-chave: Metais pesados; Troca iônica; Casca da laranja; Biossorção,

Palavras-chave: Heavy metals; Ion exchange; Orange peel; Biosorption,

DOI: 10.5151/chenpro-5erq-am2

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Como citar:

Souza, Wallas Douglas de Macêdo; Alves, Janete Jane Fernandes; Oliveira, Thiago Mielle Brito Ferreira; Oliveira, Daniele da Silva; "Potencial da casca da laranja como biossorvente alternativo para remoção de metais pesados em águas residuais", p. 619-629 . In: Anais do V Encontro Regional de Química & IV Encontro Nacional de Química [=Blucher Chemistry Proceedings].. São Paulo: Blucher, 2015.
ISSN 2318-4043, DOI 10.5151/chenpro-5erq-am2

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