A comparison was undertaken of the sorption response of oxycellulose and initial linters, i.e. the short fibres that adhere to cotton seed after ginning, towards Fe 2+ , Ca 2+ and Cd 2+ ions in fibrous slurries. The exceptional adsorption capability of oxycellulose towards metal ions (particularly Cd 2+ ions) was confirmed. However, such adsorption processes are quite complicated and are influenced by the solubility of oxycellulose, its composition and the character of the components released into the supernatant, as well as by the presence of other competitive substances and ions in the aqueous solution. The adsorption capacity of oxycellulose increases with increasing-COOH group content and is distinctly increased by the presence of other competitive ions in the aqueous solution. Most probably, this enhanced adsorption capacity of the support bears some analogy to the superficial aggregation (flocculation) induced by the presence of foreign substances.
A filter media was developed comprising ionic activated cellulosic material with enormous sorption activity to ions-active dissolved and colloidal substances in aqueous systems evoking so-called surface flocculation and a filling material having a filter effect. The dilemma of the art of low sorption efficiency and high flow rate of filtrated aqueous dispersions without sacrificing its separation efficiency of fines has been solved by use of activated cellulosic material having multi-fold (roughly tenfold to hundredfold) sorption capacity for ions-active dissolved and submicron particulate contaminants compared to untreated cellulosic material.
Natural cellulose and oxycellulose are heterogeneous highly hydrated substances. They have the same chemical composition, but different size of molecules and representation of COOH groups organized into complex supramolecular structure. The oxycellulosic adsorption capacity of organic cationic dyes increases with increasing -COOH group content and distinctly increases with other competitive ions in the aqueous solution.
Deacidification is one of the basic restoration techniques to protect archival records stored in various depositories. This study examines the influence of selected deacidification aids on lignocellulose materials. Samples represent the commonly used pulps in the paper industry. These materials were treated with three deacidification methods in cooperation with National Archive in Prague. We monitored for changes as the optical, mechanical and chemical properties and changes on hypermolecular level. The results showed that the selected deacidification methods affect the surface-molecular and structural properties. The optical properties of the samples didn´t show any decrease of the ISO brightness and the colour coordinates L*a*b*. The values of surface pH were increased as expected. The mechanical properties of the samples was characterised by unitary stiffness, it was observed a significant sample stiffness decrease after treatment with the Bookkeeper and HERCO deacidification methods.
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