Os resultados obtidos relacionados à otimização do sistema através do Planejamento Fatorial 2³, e a analise do gráfico de Pareto, apontam que as variáveis de maior influência na sequência são: o pH do meio e massa do adsorvente, sendo seus valores ótimos iguais a 9,0 e 250 mg respectivamente. Nestas condições a adsorção chegou à aproximadamente 92% de íons Cd(II) nas soluções sintéticas. O tempo de agitação, variando em 5 e 10 minutos não teve influência significativa.
As isotermas de adsorção foram aplicadas com o intuito de determinar a CMA, após a construção das isotermas de adsorção verificou-se que o modelo matemático mais adequado para se aplicar à isoterma foi o modelo de Langmuir, por apresentar melhor coeficiente de correlação (0,9721), isso implica que a adsorção ocorrem com a formação de uma monocamada de adsorbato na superfície do adsorvente, característico de quimiossorção. A relação massa do adsorbato e massa do adsorvente foi determinado a partir dessas conclusões, tendo um valor igual a 41,67 mg g-1, indicando a eficiência do material adsorvente na remoção de íons Cd(II).
As estudos cinéticos apontam que a adsorção segue a cinética de Pseudo-segunda ordem, por apresentar melhor coeficiente de correlação (0,99995) em detrimento do modelo cinético de Pseudo-primeira ordem.
A espectroscopia do infravermelho fornece dados relativos à composição do material, elucidando os grupos funcionais presentes no adsorvente, o espectro aqui apresentado apresenta bandas relativas a grupos funcionais presentes nas macromoléculas da celulose e lignina. Forneceu informações relativas à região que a adsorção ocorre, observado no espectro do material antes e após a adsorção sinalizando para possível interação entre o Cd(II) e os sítios de adsorção presentes na estrutura do adsorvente.
Os estudos realizados permite concluir que as cascas trituradas do Jatobá como um material adsorvente em potencial para remoção de íons Cd(II), em águas.
32
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