No abstract

Polyaniline–mutilwalled carbon nanotube (PANi–MWCNT) nanocomposites were electropolymerized in the presence of sodium dodecyl sulfate (SDS) onto interdigitated platinum-film planar microelectrodes (IDμE). The MWCNTs were first dispersed in SDS solution then mixed with aniline and H2SO4. This mixture was used to electro-synthesize PANi–MWCNT films with potentiostatic method at E = + 0.90 V (versus SCE). The PANi–MWCNT films were characterized by cyclic voltammetry (CV) and scanning electron microscopy (SEM). The results show that the PANi–MWCNT films have a high electroactivity, and a porous and branched structure that can increase the specific surface area for biosensing application. In this work the PANi–MWCNT films were applied for covalent immobilization of glucose oxidase (GOx) via glutaraldehyde agent. The GOx/PANi–MWCNT/IDμE was studied using cyclic voltammetric and chronoamperometric techniques. The effect of several interferences, such as ascorbic acid (AA), uric acid (UA), and acetaminophen (AAP) on the glucosensing at +0.6 V (versus SCE) is not significant. The time required to reach 95% of the maximum steady-state current was less than 5 s. A linear range of the calibration curve for the glucose concentration lies between 1 and 12 mM which is a suitable level in the human body.

The adsorbent for both cationic and anionic dye based on cellulose and polyaniline was prepared.Cellulose was puri ed from sugarcane bagasse through removal of hemicellulose and lignin. Aniline was polymerized in emulsion state in the presence of cellulose and ammonium persulfate as initiator. The FTIR spectroscopy, SEM observation and determination of porosity con rmed that polyaniline was grafted on the surface of cellulose ber to form cellulose-graft-polyaniline with high porosity. Polyaniline acted as adsorption sites for both cationic dye (methylene blue) and anionic dye (methyl orange). The adsorption on the surface of cellulose-graft-polyaniline followed the Langmuir model, suggesting that the adsorption sites on its surface was uniform. The extent of adsorbing capacity of cellulose-graftpolyaniline toward methylene blue and methyl orange was 1.57 and 0.75 mmol/g, respectively. These values con rmed that cellulose-graft-polyaniline was an e cient adsorbent for both cationic and anionic dyes. The adsorption of either cationic or anionic dye in a mixture solution did not restrain each other.Cellulose-graft-polyaniline was expected to have potential application in practical.

The adsorbent for both cationic and anionic dye based on cellulose and polyaniline was prepared. Cellulose was purified from sugarcane bagasse through removal of hemicellulose and lignin. Aniline was polymerized in emulsion state in the presence of cellulose and ammonium persulfate as initiator. The FTIR spectroscopy, SEM observation and determination of porosity confirmed that polyaniline was grafted on the surface of cellulose fiber to form cellulose-graft-polyaniline with high porosity. Polyaniline acted as adsorption sites for both cationic dye (methylene blue) and anionic dye (methyl orange). The adsorption on the surface of cellulose-graft-polyaniline followed the Langmuir model, suggesting that the adsorption sites on its surface was uniform. The extent of adsorbing capacity of cellulose-graft-polyaniline toward methylene blue and methyl orange was 1.57 and 0.75 mmol/g, respectively. These values confirmed that cellulose-graft-polyaniline was an efficient adsorbent for both cationic and anionic dyes. The adsorption of either cationic or anionic dye in a mixture solution did not restrain each other. Cellulose-graft-polyaniline was expected to have potential application in practical.