Polyelectrolyte Complexes in Flocculation Applications

Petzold, Gudrun; Schwarz, Simona

doi:10.1007/12_2012_205

Cited by 64 publications

(43 citation statements)

References 101 publications

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“…S32 to S36), whereas the reorganization of the interchain hydrogen bond network triggered by the pH-mediated adsorption-desorption equilibrium of hydronium or hydroxide (that is, hydrogen bond donors) with the brushes observed here determines the pH-responsive properties of SPBs. These pH effects are common because hydrogen bond acceptors are ubiquitous in SP systems ( 27 , 28 ). We emphasize that the pH effect of SPBs demonstrated here has different origins and applications compared to conventional ion exchange materials ( 29 ).…”

Section: Discussionmentioning

confidence: 99%

Reorganization of hydrogen bond network makes strong polyelectrolyte brushes pH-responsive

et al. 2016

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Section: Discussionmentioning

confidence: 99%

Reorganization of hydrogen bond network makes strong polyelectrolyte brushes pH-responsive

et al. 2016

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“…1 In the past few decades, the interaction between charged macromolecules and surfaces has captured considerable attention due to polyelectrolytes being applied in many industrial fields. 2 Especially in recent years, the adsorption of polymers at solid/liquid interfaces has been intensively investigated because it is relevant to many technological applications and common industrial processes involving these substances such as paper making, mineral processing, waste water treatment, paints, batteries, medicine, biological processes, ultrathin multilayers, polymer brushes and hard disk interfaces. [3][4][5][6][7][8] With the emergence and improvement of surface-sensitive techniques such as surface force apparatus, 9 atomic force microscope (AFM) [10][11][12] and quartz crystal microbalance (QCM), 3,13-15 a great number of experimental studies on the adsorption mechanism, adsorbed structures and solid/liquid interfacial properties of molecules have been carried out.…”

Section: Introductionmentioning

confidence: 99%

Nanoscale monolayer adsorption of polyelectrolytes at the solid/liquid interface observed by quartz crystal microbalance

Guo

Wang

Yang

et al. 2017

Polym J

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As a device with excellent potential, the quartz crystal microbalance (QCM) has been developed to study the interfacial properties of liquids, such as adsorption/desorption kinetics, electrochemical reaction mechanisms and interfacial viscosity. In this research, the adsorption properties of cationic polyelectrolytes (poly(diallyl dimethylammonium chloride) and poly(allylamine hydrochloride)) on solid surfaces were observed using QCM. The results indicated that the response to adsorption was different with a change in polyelectrolyte solution concentration and that the frequency shift increased as the solution concentration increased. The adsorption of the polyelectrolyte also depends on the solid surfaces and solution pH values. Furthermore, the change in the molecular conformation of the polyelectrolyte molecules is the main factor that affects the adsorption properties and structures.

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“…The increasing amount of sulfate ions leads to a decreasing pH-value of the water and therefore to damages and corrosion of cement in sewer and bridges for example [ 7 ]. Current physical and chemical processes for heavy metal ion as well as for oxyanion removal such as precipitation, filtration, reduction, and ion-exchange are expensive and inefficient in treating large quantities of water [ 8 , 9 , 10 ]. Adsorption is an efficient and economical process with increasing concern in research during the last years.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Salt Anions on Heavy Metal Ion Adsorption on the Example of Nickel

Mende¹,

Schwarz²,

Steinbach³

et al. 2018

Materials

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The biodegradable polysaccharide chitosan possesses protonated and natural amino groups at medium pH values and has therefore been used as an adsorbing material for nickel salts in water treatment. Nickel is a problematic heavy metal ion which can cause various diseases and disorders in living organisms. Here, we show the influence of oxyanions (e.g., nitrate and sulfate) to the adsorption of nickel ions. Hence, simultaneously we are addressing the increasing global problem of nitrate and sulfate ion pollution in groundwater and surface water. A series of adsorption experiments was carried out in order to determine (i) the adsorption equilibrium, (ii) the adsorption capacity in dependence on the initial nickel ion concentration, and (iii) the influence of the anion presented in solution for the adsorption capacity. Surface morphology of chitosan flakes before and after the adsorption process has been studied with SEM-EDX analysis. The chitosan flakes exhibited promising adsorption capacities of 81.9 mg·g−1 and 21.2 mg·g−1 for nickel (sulfate) and nickel (nitrate), respectively. The calculated values of Gibbs free energy change ΔG0 confirm the higher adsorption of nickel ions in presence of sulfate ions. Hence, higher anion valence leads to a higher adsorption capacity.

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Polyelectrolyte Complexes in Flocculation Applications

Cited by 64 publications

References 101 publications

Reorganization of hydrogen bond network makes strong polyelectrolyte brushes pH-responsive

Reorganization of hydrogen bond network makes strong polyelectrolyte brushes pH-responsive

Nanoscale monolayer adsorption of polyelectrolytes at the solid/liquid interface observed by quartz crystal microbalance

The Influence of Salt Anions on Heavy Metal Ion Adsorption on the Example of Nickel

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