Formation, derivatization and applications of bacterial cellulose

Geyer, U.; Heinze, Thomas; Stein, A.; Klemm, Dieter; Marsch, Silvia; Schumann, D.; Schmauder, H.‐P.

doi:10.1016/0141-8130(94)90067-1

Cited by 94 publications

(41 citation statements)

References 16 publications

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“…Because of these features there is an increasing interst in the development of new fields of application. The typical properties of bacterial cellulose have also inspired investigation on the reactivity and availability of the hydroxyl groups for chemical reactions as well as the subsequent characterization of the products obtained [10]. In the present study cellulose of Acetobacter xylinum was used as a biosorbent for removing mercury from synthetic and chlor-alkali wastewater.…”

Section: Introductionmentioning

confidence: 99%

Removal of Mercury from chlor-alkali Industry Wastewater using Acetobacter xylinum Cellulose

Rezaee¹,

Derayat²,

Mortazavi³

et al. 2005

American J. of Environmental Sciences

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Abstract:In this study, the removal of mercury ions by cellulose of Acetobacter xylinum was investigated in the synthetic and chlor-alkali wastewater. Biofilms of Acetobacter xylinum were grown in laboratory column bioreactors. The biofilms were continuously treated with sterile synthetic model wastewater or nonsterile, neutralized chloralkali wastewater.The extent of adsorption was studied as function of pH, adsorbent dose and contact time. Efficiency of mercury ion removal from chlor-alkali industry wastewater by aluminum sulfate and ferric chloride was also determined. Under acidic condition the adsorption of mercury by cellulose was quite low and increasing processing time more than10 min has no remarkably effect on the adsorption rate. Adsorption capacity of cellulose under dynamic condition for chlor-alkali wastewater was 65µg/g which was less than the value (80µg/g) that obtained from batch adsorption experiments for synthetic wastewater.

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Section: Introductionmentioning

confidence: 99%

Removal of Mercury from chlor-alkali Industry Wastewater using Acetobacter xylinum Cellulose

Rezaee¹,

Derayat²,

Mortazavi³

et al. 2005

American J. of Environmental Sciences

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“…To be one excellent material for industrial application, BC especially showed great potential as water adsorbent for its great capacity for water absorption [9,10]. However, because of its poor dissolution properties and processing difficulties, BC's application as water adsorbent for water conservation is still limited [9,[11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Preparation of Bacterial Cellulose/Inorganic Gel of Bentonite Composite by In Situ Modification

Wang

Huang

et al. 2015

Indian J Microbiol

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To evaluate the possibility of Bacterial cellulose/Inorganic Gel of Bentonite (BC/IGB) composite production using in situ method, the BC/IGB composite was successfully produced by in situ modification of BC in both HS medium and corncob hydrolysate. The results showed that the BC/IGB composite obtained in HS medium (one classical medium for BC production) had a higher water holding capacity, but the water retention capacity of the BC/IGB composite obtained in corncob hydrolysate was better. The performance of BC/IGB composite depended on the environment of in situ modification. Using different media showed significant influence on the sugar utilization and BC yield. In addition, BC/IGB composite produced by in situ method was compared with that produced by ex situ method, and the results shows that water holding capacity of BC/IGB composite obtained through in situ method was better. XRD results showed the crystallinity of BC/IGB composite related little to its performance as water absorbent. Overall, in situ modification is appropriate for further production of BC composite and other clay materials.

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“…From the viewpoint of the thermal behavior (Table 11) , the sample 23 exhibits the same properties as a cellulose tosylates prepared from plant cellulose, for instance, the degradation occurs in two main stages, while the degradation temperature of the starting BC is strongly influenced by the purification treatment as illustrated by Geyer and colleagues. 18 The degradation, however, starts at a significantly higher temperature compared to a cellulose tosylate obtained from plant cellulose with the same DS, probably due to a partially heterogeneous course of reaction and thereby a remaining degree of order. The values obtained show that the cellulose tosylates are as stable as heterogeneously prepared samples [13][14][15] and less stable than the starting cellulose.…”

Section: Final Decomposition Temperaturementioning

confidence: 97%

Thermal studies on homogeneously synthesized cellulosep-toluenesulfonates

Heinze

Rahn

Jaspers

et al. 1996

J. Appl. Polym. Sci.

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SYNOPSISThe thermal behavior in argon of homogeneously synthesized cellulose p-toluenesulfonates (tosylates) with a degree of substitution (DS) ranging from 0.4 to 2.3 was studied by means of thermogravimetry and derivative thermogravimetry from ambient temperature up to 500°C. For comparison, the thermal behavior of the starting celluloses used (pulps, linters, bacterial cellulose) was also examined. The thermal degradation of cellulose tosylates was initiated at lower temperature than cellulose itself and proceeds in two main stages. The temperature of the first one (169-196OC) increases with increasing DS and is independent of the molecular weight. Activation energies calculated following the method of Broido, FTIR, and ultimate analysis as well as mass spectroscopy show that the first stage of degradation is closely associated not only with the scission of tosyl ester groups but also with a partially degradation of the polymer backbone. Further, the temperature-concentration diagram for the system cellulose tosylate 2O/o-dichlorobenzene was studied by optical observations and calorimetric investigations. A liquid-liquid demixing interferes with the glass transition of the cellulose tosylate-solvent system. It results in the solidification of the solution.

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Formation, derivatization and applications of bacterial cellulose

Cited by 94 publications

References 16 publications

Removal of Mercury from chlor-alkali Industry Wastewater using Acetobacter xylinum Cellulose

Removal of Mercury from chlor-alkali Industry Wastewater using Acetobacter xylinum Cellulose

Preparation of Bacterial Cellulose/Inorganic Gel of Bentonite Composite by In Situ Modification

Thermal studies on homogeneously synthesized cellulosep-toluenesulfonates

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