Highly improved chromium (III) uptake capacity in modified sugarcane bagasse using different chemical treatments

The present paper focuses on improving chromium (III) uptake capacity of sugarcane bagasse through its chemical modification with citric acid and/or sodium hydroxide. The chemical modifications were confirmed by infrared spectroscopy, with an evident peak observed at 1730 cm-1, attributed to carbonyl groups. Equilibrium was reached after 24 h, and the kinetics followed the pseudo-second-order model. The highest chromium (III) maximum adsorption capacity (MAC) value was found when using sugarcane bagasse modified with sodium hydroxide and citric acid (58.00 mg g-1) giving a MAC value about three times greater (20.34 mg g-1) than for raw sugarcane bagasse.

Thermal behavior of alginic acid and its sodium salt

An evaluation of hydration and thermal decomposition of HAlg and its sodium salt is described using thermogravimetry (TG) and differential scanning calorimetry (DSC). TG curves in N2 and air, were obtained for alginic acid showed two decomposition steps attributed to loss of water and polymer decomposition respectively. The sodium alginate decomposed in three steps. The first attributed to water loss, followed by the formation of a carbonaceous residue and finally the Na2CO3. DSC curves presented peaks in agreement with the TG data. In the IR alginic acid presented bands at 1730 and 1631 cm-1, while sodium alginate presented a doublet at 1614 e 1431 cm-1, evidencing the presence of salified carboxyl groups.

Erään tekstiiliyrityksen tarina : ekskursio ranskalaiseen poliittiseen taloustieteeseen

Kirjallisuusarvostelu

L'Univers

1872/03/13 (Numéro 1730).

Charta öfver Åland : Del. C. T.

Tekijä: Christophorus Tärnström, 1711-1746, laivapastori, tutkimusmatkailija.

Accurata Utopiae tabula : das ist der neuentdeckten Schalck-Welt, oder des so offtbenannten, und doch nie erkannten Shlarraffenlandes neu erfundene lächerliche Land-Tabelle

Irtokartta

Mexico ; New York ; Fall of Niagara ; Quebec

Irtokartta

Verschiedene Prospecte der vornemsten Städten in Persien samt vorderst einer unsern dem Caspischen Meer, dem Russischen Reich zugehörig, gelegenen Stadt, zu mehrerem Liecht und Erleuterung der neu-verfertigten persianischen Land-Charten

Irtokartta

Nova descriptio geographica Tartariae magnae : tam orientalis quam occidentalis in particularibus et generalibus territoriis una cum delineatione totius Imperii Russici imprimis Siberiae accurate ostensa

Kartta kuuluu A. E. Nordenskiöldin kokoelmaan

Einer grossen richtigen Land-Charte : das Nord- und Ostlichen Teil von Europa und Asia in so weit solches das ganze Russische Reich mit Sibirien der grossen Tartarey in sich begreiffet ...

Kartta kuuluu A. E. Nordenskiöldin kokoelmaan

Novissima Russiae tabula.

Julkaisuvuosi aikaisintaan 1734, viimeistään 1737.

A new map of Denmark and Sweden. According to ye newest and most exact observations. By H. Moll, geographer.

Kahdessa osassa painettu kartta.

Mappae imperii Moscovitici pars Septentrionalis adornata per Guillielmum de l'Isle, membrum Academiae Regalis Scientiarum et celeberr: reg: Galliae geographum; nunc vero aeri incisa et venalis exposita à Matth: Seutter s: August. Vindel.

[N. 1:2570000].

Carte nouvelle de tout l'empire de la grande Russie dans l'estat ou il s'est trouvé à la mort de Pierre le Grand dressée sur des observations toutes nouvelles et dediée à l'immortale memoire de ce grand monarque. Avec privilege.

Janamittakaavat: Lieuës, Werstes.

De chior bemaroth hatzobheoth

Invokaatio: I.N.J.