Abstract
This review concentrates on the interactions between oppositely charged polyelectrolytes and on the formation of complexes, which can be used for different applications such as paper retention or water treatment. Three different possibilities for the appearance of polyelectrolyte complexes (PECs) in flocculation applications are described. Starting with the “classical” dual system (step-by-step addition of polycation and polyanion to a negatively charged suspension of fibers or particles), the interaction between a “soluble polyanion” (such as anionic trash) with polycation is described as well as the formation of well-defined pre-mixed PECs and their application as flocculants.
The influence of several parameters related to the characteristics of the solid materials (e.g., charge, particle size), the polyelectrolyte (e.g., type of charge, charge density, molar mass, hydrophobicity) and the flocculation regime (e.g., order of addition, pH, ionic strength) are discussed.
Research in this area shows great potential. Over the past 30 years, dual systems have been applied mainly in the paper industry. The application of PECs, described as particle-forming flocculants, provides new possibilities in solid–liquid separation processes. For an effective system, the application parameters have to be optimized (e.g. polymer type, concentration, charge, molecular weight). Therefore, direct and efficient methods for the characterization of the flocculation behavior (sedimentation velocity, packing density of the sludge, particle size distribution) are necessary and will be described.
Finally, the most advanced applications for PECs are discussed.
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Abbreviations
- AFM:
-
Atomic force microscopy
- CD:
-
Charge density
- CMC:
-
Carboxymethylcellulose
- cmc:
-
Critical micelle concentration
- CNT:
-
Carbon nanotubes
- CPR:
-
Carboxylated phenolic resin
- DCS:
-
Dissolved colloidal substances
- DLS:
-
Dynamic light scattering
- DMAPAA:
-
N,N-Dimethylaminopropylacrylamide
- DSC:
-
Differential scanning calorimetry
- FTIR:
-
Fourier transform infrared spectroscopy
- GPE:
-
Short-chained guest PEL
- HA:
-
Humic acid
- HCS:
-
Highly cationic starches
- HMW:
-
High molecular weight
- HPE:
-
Long-chained host PEL
- LCST:
-
Lower critical solution temperature
- LMW:
-
Low molecular weight
- MMW:
-
Medium molecular weight
- NaPA:
-
Poly(sodium acrylate)
- NaPAMPS:
-
Poly(sodium 2-acrylamido-2-methylpropanesulfonate)
- NaPSS:
-
Poly(styrene-p-sodium sulfonate-sodium salt)
- NIPEC:
-
Nonstoichiometric interpolyelectrolyte complex dispersion
- NPEC:
-
Nonstoichiometric polyelectrolyte complex
- OM-PEI:
-
Oligo-maltose-modified PEI
- P(MSP):
-
Poly(maleic acid-co-propylene)
- P(MS-α-MeSty):
-
Poly(maleic acid-co-α-methylstyrene)
- PA:
-
Polyanion
- PAA:
-
Poly(acrylamide)
- PAC:
-
Poly(acrylic acid)
- PAE:
-
Polyamideamine epichlorohydrine condensate
- PAMPS:
-
Poly(sodium 2-acrylamido-2-methylpropanesulfonate)
- PC:
-
Polycation
- PC/D/PA:
-
Polycation/dye/polyanion complexes
- PCA5:
-
Polycations containing N,N-dimethyl-2-hydroxypropylene ammonium chloride
- PCA5D1:
-
Polycations containing N,N-dimethyl-2-hydroxypropylene ammonium chloride with different hydrophobic units
- PDADMAC:
-
Poly(N,N-diallyl-N,N-dimethyl-ammonium chloride)
- PEC:
-
Polyelectrolyte complex
- PEI:
-
Poly(ethyleneimine)
- PEL:
-
Polyelectrolytes
- PEO:
-
Poly(ethylene oxide)
- PI:
-
Polydispersity index
- PMADAMBQ:
-
Copolymer of N-methacryloyloxyethyl–N-benzyl-N,N-dimethyl-ammonium chloride
- PNIAA:
-
Poly(isopropylacrylamide-co-acrylic acid)
- PNIPAAM:
-
Poly(N-isopropylacrylamide)
- PNVCL:
-
Poly(N-vinylcaprolactam)
- PPEI:
-
Phosphonomethylated derivative of PEI
- PR2540:
-
Poly(acrylamide-co-sodium acrylate)
- PSC:
-
Polyelectrolyte–surfactant complex
- PSS:
-
Poly(styrene sulfonate)
- PTMMAC:
-
Poly[NNN-trimethyl-N-(2-methacryloxyethyl) ammonium chloride]
- PVA:
-
Poly(vinyl alcohol)
- Quartolan:
-
Dodecyl-amidoethyl-dimethylbencyl-ammonium chloride
- SDS:
-
Sodium dodecylsulfate
- siRNA:
-
Small interfering RNA
- TC:
-
Trash content
- TOC:
-
Total organic carbon content
- XPS:
-
X-ray photoelectron spectroscopy
- XRD:
-
X-ray diffraction
- Polycation:
- Polyanion:
- Negatively charged particle:
- Polyelectrolyte complex:
- Micelle:
- Negatively charged waste:
- Surfactant:
- Star-like polymer:
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Acknowledgements
We are indebted to many long-term collaborators and colleagues, especially to Dr. Stela Dragan and her group (Institute Petru Poni, Iasi, Romania) and to Dr. Svetlana Bratskaya (Far East Department of Russian Academy of Sciences, Institute of Chemistry, Vladivostok, Russia). The investigations with tailored polymers, especially hydrophobic PCs, were undertaken in collaboration with Prof. Laschewsky and his group (Fraunhofer IAP Golm, Germany). Above all, we would like to thank our unforgettable colleague and friend Dr. Werner Jaeger.
Financial support from the BMBF and AiF is gratefully acknowledged.
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Petzold, G., Schwarz, S. (2013). Polyelectrolyte Complexes in Flocculation Applications. In: Müller, M. (eds) Polyelectrolyte Complexes in the Dispersed and Solid State II. Advances in Polymer Science, vol 256. Springer, Berlin, Heidelberg. https://doi.org/10.1007/12_2012_205
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DOI: https://doi.org/10.1007/12_2012_205
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