Transport properties of chitosan membranes for zinc (II) removal from aqueous systems

Osifo, Peter Ogbemudia; Neomagus, Hein W.J.P.; Merwe, Hein van der; Branken, D.J.

doi:10.1016/j.seppur.2017.02.030

Cited by 22 publications

(15 citation statements)

References 33 publications

(48 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…During preparation, the type and concentration of the basic aqueous solution is known to influence the coagulation rate and structure of the chitosan gel. Moreover, the deacetylation degree of chitosan affects the distilled water permeation characteristics of the membrane [ 24 ]. The film-forming properties of chitosan are affected by the molecular weight of the chitosan and the alkali treatment at the time of membrane formation.…”

Section: Introductionmentioning

confidence: 99%

Dependence of Water-Permeable Chitosan Membranes on Chitosan Molecular Weight and Alkali Treatment

et al. 2020

View full text Add to dashboard Cite

Chitosan membranes were prepared by the casting method combined with alkali treatment. The molecular weight of chitosan and the alkali treatment influenced the water content and water permeability of the chitosan membranes. The water content increased as the NaOH concentration was increased from 1 to 5 mol/L. The water permeation flux of chitosan membranes with three different molecular weights increased linearly with the operating pressure and was highest for the membrane formed from chitosan with the lowest molecular weight. Membranes with a lower water content had a higher water flux. The membranes blocked 100% of compounds with molecular weights above methyl orange (MW = 327 Da). At 60 ≤ MW ≤ 600, the blocking rate strongly depended on the substance. The results confirmed that the membranes are suitable for compound separation, such as in purification and wastewater treatment.

show abstract

Section: Introductionmentioning

confidence: 99%

Dependence of Water-Permeable Chitosan Membranes on Chitosan Molecular Weight and Alkali Treatment

et al. 2020

View full text Add to dashboard Cite

show abstract

“…[28][29][30][31][32][33][34][35][36][37][38][39] Dialdehyde wie Glutaraldehyd, [29,[40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55] Glyoxal [29,56,57] und 2,6-Pyridindicarbaldehyd [58] sind ebenfalls gebräuchliche Vernetzer.G lutaraldehyd ist zudem als Fixierungsmittel fürb iologische Gewebe bekannt und wird nicht nur als Gelierungsmittel fürChitosan, sondern auch als Vernetzer nach der Gelierung zur Verbesserung der mechanischen Stabilitäte ingesetzt. [59][60][61][62][63][64] Oxidierte Polysaccharide wie Dextran [52] und Cellulose [65] weisen ebenfalls mehrere Aldehydfunktionen pro Polymerkette auf,s odass eine Schiff-Basen-Vernetzung von Chitosan mçglich ist.…”

Section: Chemische Vernetzungunclassified

Chemie der Chitosan‐Aerogele: Lenkung der dreidimensionalen Poren für maßgeschneiderte Anwendungen

et al. 2020

View full text Add to dashboard Cite

Indiesem Aufsatz diskutieren wir die schnell wachsende Zahl an Literaturbeiträgen zu Chitosan-basierten porçsen Materialien, mit Schwerpunkt auf Gelierungsmechanismen, dreidimensionaler multiskaliger Strukturkontrolle sowie der mannigfaltigen chemischen Funktionalität, die mit anderen Biopolymeren nicht erreichbar ist. Die Eigenschaften unterscheiden sich von letzteren teils stark:v on überkritischg etrockneten, mesoporçsen Chitosan-Aerogelen bis hin zu äußerst leichten, gefriergetrockneten makroporçsen Gerüsten. Im Labormaßstab erreicht porçses Chitosan beeindruckende Eigenschaften, der hoch(meso)porçse Charakter verstärkt jedoch nicht nur die vorteilhafte Funktionalitätdes Chitosans,sondern auchseine Nachteile,was eine mçgliche Industrialisierung ernsthaft einschränkt. Zur Fçrderung des Technologietransfers diskutieren wir in kritischer Weise die praktische Umsetzbarkeit mçglicher Anwendungen von Chitosan-Aerogelen im Vergleich zu konventionellen und anderen biopolymerbasierten porçsen oder nichtporçsen Materialien. Aus dem Inhalt 1. Einleitung 9914 2. Synthese von Chitosan-Aerogelen 9916 3. Prozess-Struktur-Eigenschafts-Beziehungen 9920 4. Oberflächenchemie und Funktionalisierung 9925 5. Anwendungen 9927 6. Zusammenfassung und Ausblick: auf dem Wegz ur Industrialisierung 9932

show abstract

“…However, a high concentration will cause an accelerated degradation of chitosan molecules. 30,31 After many trials, we chose 99.5% (v/v) acetic acid diluted with deionized water to obtain 3% (v/ v) acetic acid as the final solution (pH ¼ 5.4). Moreover, the PGA monofilament and the PLA monofilament, the base parts in embedding materials with self-swelling behaviors, were coated with chitosan solutions by this designed coating system.…”

Section: Embedding Monofilament Preparationmentioning

confidence: 99%

A study of the chitosan coating method on polyglycolic acid and polylactic acid embedding monofilaments

Zhang

2017

Textile Research Journal

View full text Add to dashboard Cite

With the development of applying acupoint catgut embedding therapy to the treatment of juvenile pseudomyopia, embedding materials are expected to be the perfect for choice by taking advantage of the lasting effect and minimal invasiveness. This work adopted polyglycolic acid (PGA) and polylactic acid (PLA) monofilaments to produce four types of chitosan coated monofilaments with excellent swelling behaviors. For achieving better coating weight gains, a one-dipping-one-rolling coating system was developed. The results showed that both the PGA and PLA monofilaments' swelling behaviors were greatly improved, CS-PGA2 (98.17 ± 3.15%) presented a great difference from CS-PLA1 (47.56 ± 6.15%) and CS-PLA2 (63.31 ± 3.26%), respectively, while CS-PGA1 (87.36 ± 5.16%) had a similar expansion rate to that of CS-PGA2. The resist deformation ability of the monofilament was strengthened and the crystalline zones of PGA and PLA monofilaments were slightly decreased after a chitosan coating process. The CS-PGA group and PGA group were found to degrade completely in 56 days and 70 days, respectively, while the PLA group changed little in the experimental process, offering a new insight into controlled degradation research. In conclusion, all coated monofilaments show potential in acting as embedding materials with good swelling behaviors, and the CS-PGA group is proved to have a higher prospect for clinical applications.

show abstract

Transport properties of chitosan membranes for zinc (II) removal from aqueous systems

Cited by 22 publications

References 33 publications

Dependence of Water-Permeable Chitosan Membranes on Chitosan Molecular Weight and Alkali Treatment

Dependence of Water-Permeable Chitosan Membranes on Chitosan Molecular Weight and Alkali Treatment

Chemie der Chitosan‐Aerogele: Lenkung der dreidimensionalen Poren für maßgeschneiderte Anwendungen

A study of the chitosan coating method on polyglycolic acid and polylactic acid embedding monofilaments

Contact Info

Product

Resources

About