Kraft lignin and its derivates-A study on the adsorption of mono and multielement metals, potential use for noble metal recycling and an alternative material for solid base catalyst

Autor(es)

Akiba, Naomi ; Omori, Alvaro T. ; Gaubeur, Ivanise

• Tipo de documento: Artigo Científico
• Fonte: Chemosphere; v. 308, p. 8-pg., 2022-12-01.

Resumo

Lignin is a natural polymer containing diverse functional groups and displaying an affinity for metals. Kraft lignin can be used as a carbon source, as a cleaving lignin structure for aromatic macromers or in the addition and modification of functional groups by the development of new active chemical sites. In this context, the aim of the present study is to investigate the adsorption of mono and multi-element metals solutions on lignin derivatives (unmodified Kraft lignin, acetylated Kraft lignin, charcoal Kraft lignin and activated carbon Kraft lignin). Parameters that affect adsorption processes, such as pH, contact time and adsorbent dose, were optimized in each case. The best adsorption condition was obtained at pH 7.00, a contact time of 120 min and with adsorbent dose of 30 mg. Also, unmodified Kraft lignin shows high adsorption selectivity (99%) for gold and palladium in acidic solutions. Acetylated and charcoal Kraft lignin resulted in lower adsorption levels in comparison with unmodified Kraft lignin. Activated carbon, however, reached adsorptions of over 86% for all metals. Finally, unmodified Kraft lignin impregnated with palladium presents a promising heterogeneous support in the Suzuki-Miyaura reaction. (AU)

• Processo FAPESP: 11/19730-3 - Emprego da extração em ponto nuvem (CPE) e da microextração líquido-líquido dispersiva (DLLME) no desenvolvimento de métodos analíticos para a pré-concentração e determinação espectrométrica de metais
• Beneficiário: Ivanise Gaubeur
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 17/18007-2 - EXPANDINDO O USO DA CENOURA (Daucus carota) EM SÍNTESE ORGÂNICA - APLICAÇÕES EM SÍNTESE TOTAL DE MOLÉCULAS BIOATIVAS, NOVOS SUBSTRATOS E DESENVOLVIMENTO DE UMA METODOLOGIA VISANDO O SCALE-UP
• Beneficiário: Alvaro Takeo Omori
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 16/23878-0 - Consolidação e inovação da linha de pesquisa: desenvolvimento de métodos analíticos combinados a microextração em fase líquida
• Beneficiário: Ivanise Gaubeur
• Modalidade de apoio: Auxílio à Pesquisa - Regular