Bioinspired tannic acid-copper complexes as selective coating for nanofiltration membranes

Chakrabarty, Tina; Pérez-Manríquez, Liliana; Neelakanda, Pradeep; Peinemann, Klaus‐Viktor

doi:10.1016/j.seppur.2017.04.043

Cited by 75 publications

(38 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…18 These so-called metal phenolic networks (MPN) are usually prepared using transition metal ions, such as Fe 3 + , Al 3+ , Cu 2+ , and Mn 2+ cations. [19][20][21][22] In addition, the intrinsic auto-oxidation in aqueous solution can initiate the polymerization of polyphenolic molecules that enables the coating formation. [23][24] The oxidation of phenolic hydroxyl groups by dissolved oxygen forms quinones and semi-quinones, 25 which couple via secondary interactions, such as hydrogen bonding, 26 interaction of electron donor-acceptor systems (π-stacking), 27 or proceed to form primary bonds.…”

Section: Introductionmentioning

confidence: 99%

Silicic Acid-Mediated Formation of Tannic Acid Nanocoatings

2019

View full text Add to dashboard Cite

Tannic acid (TA) adheres to a broad variety of different materials and forms versatile surface coatings for technical and biological applications. In mild alkaline conditions, auto-oxidation processes occur and a firm monolayer is formed. Up to now, thicker coatings are only obtained in cross-linked multilayer fashion. This study presents an alternative method to form continuous TA coatings using ortho-silicic acid (Siaq). Adsorption kinetics and physical properties of TA coatings in the presence of Siaq were determined using a quartz crystal microbalance (QCM-D) and nanoplasmonic spectroscopy (NPS). An in situ TA layer thickness of 200 nm was obtained after 24 h in solutions supplemented with 80 µM Siaq. Dry state measurements indicated a highly hydrated layer in situ. Furthermore, chemical analysis by FTIR spectroscopy revealed possible complexation of TA by Siaq, whereas UV-vis spectroscopy did not indicate an interaction of Siaq in the auto-oxidation process of TA. Investigation of additional metalloid ions showed that germanic acid was also able to initiate a continuous coating formation of TA, whereas boric acid prevented the polymerization process. In comparison to TA, the coating formation of pyrogallol (PG) and gallic acid (GA) was not affected by Siaq. PG formed continuous coatings also without Siaq, while GA only formed a monolayer in presence of Siaq. However, Siaq induced a continuous layer formation of ellagic acid (EA). These results indicate the specific importance of ortho-silicic acid in the coating formation of polyphenolic molecules with multiple ortho-dihydroxy groups and open new possibilities to deposit TA on interfaces.

show abstract

Section: Introductionmentioning

confidence: 99%

Silicic Acid-Mediated Formation of Tannic Acid Nanocoatings

2019

View full text Add to dashboard Cite

show abstract

“…Mimicking the hierarchical structures of beetle's back, we speculate that the heterostructured membranes, composed of two materials with reversed hydrophilicity/hydrophobicity, might realize a subtle synergy of dissolution and diffusion. Although such membranes have been rarely reported, some other bioinspired membranes have been prepared and acquire outstanding performances . For instance, inspired by marine mussel, Szekely et al fabricated a nanofiltration membrane by in situ polymerization of dopamine within polybenzimidazole support, acquiring a high DMF permeance (≈26 L m −2 h −1 bar −1 ) …”

Section: Introductionmentioning

confidence: 99%

Beetle‐Inspired Assembly of Heterostructured Lamellar Membranes with Polymer Cluster–Patterned Surface for Enhanced Molecular Permeation

Wang

Yuan

et al. 2019

Adv Funct Materials

View full text Add to dashboard Cite

2D lamellar membranes hold great promise in efficient molecular separations of liquid and gas mixtures. However, the simultaneous realization of high permeation and precise sieving (i.e., overcoming the permeation-rejection tradeoff ) of membranes poses a great challenge. Inspired by the structures and functions of the beetle's back, the heterostructured lamellar membranes fabricated through facile and controllable electrostatic atomization method are reported. Particularly, hydrophobic polymer clusters are patterned on hydrophilic laminate (graphene oxide) surfaces to realize the hydrophilic/hydrophobic heterostructure. It shows that the fast dissolution for nonpolar solvents is achieved by the strong affinity polymer clusters, and the ultralow-barrier diffusion is achieved by the weak affinity laminate channels. Therefore, the permeance is remarkably enhanced (over 7 times for nonpolar solvents), while fully retaining membrane rejection. In contrast, hydrophilic clusters are patterned on hydrophobic laminate (reduced graphene oxide) surfaces and exhibit similar behaviors toward polar solvents. Furthermore, the lamellar membrane displays highly ordered layer-by-layer stacking, affording precise molecular rejection. Besides, the lamellar membrane acquires lower thermodynamic energy and hence superior stability under ultrasonic and strong acid or alkali environments, manifesting great potential for long-term practical operation.

show abstract

“…It is a water-soluble polyphenolic material with high molecular weights, between 500 and 3000 Da [4,5]. TA is a natural compound found in bananas, sorghum, coffee, and tea [6,7]. It is also found in industrial wastewaters, which is an emerging problem because of their harmful influence on natural ecosystems [5,8].…”

Section: Introductionmentioning

confidence: 99%

Oxidative Degradation of Tannic Acid in Aqueous Solution by UV/S2O82− and UV/H2O2/Fe2+ Processes: A Comparative Study

et al. 2019

View full text Add to dashboard Cite

Tannic acid (TA) is a major pollutant present in the wastewater generated from vegetable tanneries process and food processing. This work studied TA degradation by two advanced oxidation processes (APOs): UV irradiation at the wavelength of 254 nm in the presence of hydrogen peroxide (H2O2) and ferrous iron (photo-Fenton) and in the presence of potassium persulfate. The influence of certain experimental parameters such as K2S2O8, H2O2, Fe2+, and TA concentrations, initial pH and temperature was evaluated in order to obtain the highest efficiency in terms of aromatics (decay in UV absorbance at 276 nm) and TOC removals. Chemical oxidation of TA (0.1 mM) by UV/persulfate achieved 96.32% of aromatics removal and 54.41% of TOC removal under optimized conditions of pH = 9 and 53.10 mM of K2S2O8 after 60 min. The treatment of TA by photo-Fenton process successfully led to almost complete aromatics removal (99.32%) and high TOC removal (94.27%) from aqueous solutions containing 0.1 mM of TA at natural pH = 3 using 29.4 mM of H2O2 and 0.18 mM of Fe2+ at 25 °C after 120 min. More efficient degradation of TA by photo-Fenton process than UV/persulfate was obtained, which confirms that hydroxyl radicals are more powerful oxidants than sulfate radicals. The complete removal of organic pollution from natural waters can be accomplished by direct chemical oxidation via hydroxyl radicals generated from photocatalytic decomposition of H2O2.

show abstract

Bioinspired tannic acid-copper complexes as selective coating for nanofiltration membranes

Cited by 75 publications

References 34 publications

Silicic Acid-Mediated Formation of Tannic Acid Nanocoatings

Silicic Acid-Mediated Formation of Tannic Acid Nanocoatings

Beetle‐Inspired Assembly of Heterostructured Lamellar Membranes with Polymer Cluster–Patterned Surface for Enhanced Molecular Permeation

Oxidative Degradation of Tannic Acid in Aqueous Solution by UV/S2O82− and UV/H2O2/Fe2+ Processes: A Comparative Study

Contact Info

Product

Resources

About