BRPI0702691A2 - processes for the preparation of chemically modified celluloses or lignocellulosic fibers for the removal of metal ions in liquid solution - Google Patents
processes for the preparation of chemically modified celluloses or lignocellulosic fibers for the removal of metal ions in liquid solutionInfo
- Publication number
- BRPI0702691A2 BRPI0702691A2 BRPI0702691-9A BRPI0702691A BRPI0702691A2 BR PI0702691 A2 BRPI0702691 A2 BR PI0702691A2 BR PI0702691 A BRPI0702691 A BR PI0702691A BR PI0702691 A2 BRPI0702691 A2 BR PI0702691A2
- Authority
- BR
- Brazil
- Prior art keywords
- processes
- present
- lignocellulosic fibers
- solution
- removal
- Prior art date
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- Polysaccharides And Polysaccharide Derivatives (AREA)
Abstract
Processos para Preparação de celuloses ou de fibras lignocelulósicas modificados quimicamente para a remoção de lons metálicos em solução líquida. A presente invenção refere-se aos processos de preparação de materiais, a partir da celulose ou de qualquer fibra lignocelulósica, para complexar lons de metais em solução e, assim, descontaminar soluções por tais metais. Os quatro materiais são preparados a partir da modificação dos grupos hidroxila presentes na celulose ou nas fibras lignocelulósicas com um anidrido de ácido carboxílico cíclico como o anidrido succínico, para a obtenção do Material I, e o dianidrido do etilenodiaminotetracético (EDTA), para a obtenção do Material II. Quando a fibra inicial é tratada com solução aquosa de NaOH (mercerização) há um aumento da modificação química com o anidrido usado. Posteriormente, as funções ácido carboxilico introduzidas no Material I são usadas para ancorar poliaminas, para obter o Material III contendo funções amina. O Material III é tratado com haletos de alquila para a obtenção do Material IV. Os novos materiais obtidos I, II e III são capazes de adsorver cátions metálicos presentes em várias soluções líquidas e assim, descontaminar soluções por tais metais. O novo Material iv é capaz de adsorver oxiânions presentes em soluções líquidas.Processes for the preparation of chemically modified celluloses or lignocellulosic fibers for the removal of metallic lions in liquid solution. The present invention relates to processes for preparing materials from cellulose or any lignocellulosic fiber for complexing metal lions in solution and thus decontaminating solutions by such metals. The four materials are prepared by modifying the hydroxyl groups present in cellulose or lignocellulosic fibers with a cyclic carboxylic acid anhydride such as succinic anhydride to obtain Material I and ethylenediaminetetraacetic dianhydride (EDTA) to obtain of Material II. When the initial fiber is treated with aqueous NaOH (mercerization) solution there is an increase in chemical modification with the anhydride used. Subsequently, the carboxylic acid functions introduced in Material I are used to anchor polyamines to obtain Material III containing amine functions. Material III is treated with alkyl halides to obtain Material IV. The obtained new materials I, II and III are capable of adsorbing metallic cations present in various liquid solutions and thus decontaminating solutions by such metals. The new Material iv is capable of adsorbing oxyions present in liquid solutions.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BRPI0702691-9A BRPI0702691A2 (en) | 2007-07-13 | 2007-07-13 | processes for the preparation of chemically modified celluloses or lignocellulosic fibers for the removal of metal ions in liquid solution |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BRPI0702691-9A BRPI0702691A2 (en) | 2007-07-13 | 2007-07-13 | processes for the preparation of chemically modified celluloses or lignocellulosic fibers for the removal of metal ions in liquid solution |
Publications (1)
Publication Number | Publication Date |
---|---|
BRPI0702691A2 true BRPI0702691A2 (en) | 2009-11-24 |
Family
ID=41338326
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
BRPI0702691-9A BRPI0702691A2 (en) | 2007-07-13 | 2007-07-13 | processes for the preparation of chemically modified celluloses or lignocellulosic fibers for the removal of metal ions in liquid solution |
Country Status (1)
Country | Link |
---|---|
BR (1) | BRPI0702691A2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN115888658A (en) * | 2022-11-17 | 2023-04-04 | 广西大学 | Cationized lignocellulose nanofiber adsorbent and preparation method and application thereof |
-
2007
- 2007-07-13 BR BRPI0702691-9A patent/BRPI0702691A2/en not_active Application Discontinuation
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN115888658A (en) * | 2022-11-17 | 2023-04-04 | 广西大学 | Cationized lignocellulose nanofiber adsorbent and preparation method and application thereof |
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