Adsorption and flocculation behavior of cationic polyacrylamide and colloidal silica

Solberg, Daniel; Wågberg, Lars

doi:10.1016/s0927-7757(03)00029-3

Cited by 104 publications

(67 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In such a situation the most possible adsorption mechanism is hydrogen bond type interaction between the surface active groups of the adsorbent and the hydroxyl groups of CMC. The additional role may be also played by the electrostatic, nonspecific interaction between the partly dissociated hydroxyl groups and the surface of the adsorbent (Soldberg and Wagberg 2003). In the contrary situation, when the adsorption process is conducted in the pH range larger than pH pzc , the surface of the adsorbent is negatively charged.…”

Section: Resultsmentioning

confidence: 99%

Competitive adsorption in the system: carboxymethylcellulose/surfactant/electrolyte/Al2O3

Grządka

2011

Cellulose

View full text Add to dashboard Cite

The adsorption of carboxymethylcellulose (CMC) in the presence or absence of the surfactants: anionic SDS, nonionic Triton X-100 and their mixture SDS/TX-100 from the electrolyte solutions (NaCl, CaCl 2 ) on the alumina surface (Al 2 O 3 ) was studied. In each measured system the increase of CMC adsorption in the presence of surfactants was observed. This increase was the smallest in the presence of SDS, a bit larger in the presence of Triton X-100 and the largest when the mixture of SDS/Triton X-100 was used. These results are a consequence of formation of complexes between the CMC and the surfactant particles. Moreover, the dependence between the amount of surfactants' adsorption and the CMC initial concentration was measured. It comes out that the surfactants' adsorption amount is not dependent on the CMC initial concentration and moreover, it is unchanged in the whole measured concentration range. The influence of kind of electrolyte, its ionic strength as well as pH of a solution on the amount of the CMC adsorption at alumina surface was also measured. The amount of CMC adsorption is larger in the presence of NaCl than in the presence of CaCl 2 as the background electrolyte. It is a result of the complexation reaction between Ca 2? ions and the functional groups of CMC belonging to the same macromolecule. As far as the electrolyte ionic strength is concerned the increase of CMC adsorption amount accompanying the increase of electrolyte ionic strength is observed. The reason for that is the ability of electrolyte cations to screen every electrostatic repulsion in the adsorption system. Another observation is that the increase of pH caused the decrease of CMC adsorption. The explanation of this phenomenon is connected with the influence of pH on both dissociation degree of polyelectrolyte and kind and concentration of surface active groups of the adsorbent.

show abstract

Section: Resultsmentioning

confidence: 99%

Competitive adsorption in the system: carboxymethylcellulose/surfactant/electrolyte/Al2O3

Grządka

2011

Cellulose

View full text Add to dashboard Cite

show abstract

“…It is known that cationic polyelectrolytes like acrylamide-MAPTAC copolymer are adsorbing onto cellulose fibers [45] or model cellulose films [46] and modify the adhesion behavior. Without adsorbed polyelectrolyte the sticking/adhesion between the planar cellulose surface and the cellulose beads is weak.…”

Section: Discussionmentioning

confidence: 99%

Molecularly smooth cellulose surfaces for adhesion studies

Sczech

Riegler

2006

Journal of Colloid and Interface Science

View full text Add to dashboard Cite

“…Generally, when adsorption involves a surface reaction process, the initial adsorption is rapid, as observed by Solberg and Wågberg for cationic polyacrylamide. 1 Then, a slower adsorption would follow as the available adsorption site gradually decreases and repulsive forces increase.…”

Section: Adsorption Kineticsmentioning

confidence: 99%

Flocculation properties and adsorption kinetics of cationic starches in kaolin suspensions

Chen

Liu

Wang

2007

J of Applied Polymer Sci

View full text Add to dashboard Cite

The flocculation characteristics of cationic starches with degree of substitution (DS 0.32-0.63) have been evaluated in 1.0 wt % kaolin suspension by spectrophotometry and colloid titration. Cationic starch is found to be an effective flocculant for removal of anionic suspension particles. Changes in the electrokinetics of kaolin as a function of pH were investigated in the absence of flocculant. The results show that kaolin in water exhibits a negative surface charge at pH > 2.5. The negative hydrophilic surface sites of kaolin are responsible for the adsorption of cationic starch molecules. The experimental data of the adsorption of cationic starch (DS 0.51) follow a Langmuir isotherm with maximum adsorption capacities of 16.89 mg/g. For the adsorption of cationic starch, chemical reaction seems significant in the rate-controlling step and the pseudosecond-order chemical reaction kinetics provides the best correlation for the experimental data.

show abstract

Adsorption and flocculation behavior of cationic polyacrylamide and colloidal silica

Cited by 104 publications

References 21 publications

Competitive adsorption in the system: carboxymethylcellulose/surfactant/electrolyte/Al2O3

Competitive adsorption in the system: carboxymethylcellulose/surfactant/electrolyte/Al2O3

Molecularly smooth cellulose surfaces for adhesion studies

Flocculation properties and adsorption kinetics of cationic starches in kaolin suspensions

Contact Info

Product

Resources

About