Person | TU Delft Repository

L. Paltrinieri

View Orcid Profile

View Pure Profile

Authored

12 records found

Phosphate recovery

From Nanoparticles to Membrane Technology

Doctoral thesis - L. Paltrinieri

Scalable and Environmentally Benign Process for Smart Textile Nanofinishing

Journal article - J. Feng, Esther Hontañón, Frank Einar Kruis, A. Schmidt-Ott, G. Biskos, G. Biskos, G. Biskos, Maria Blanes, Jörg Meyer, Xiaoai Guo, Laura Santos, L. Paltrinieri, N. Ramlawi, L.C.P.M. de Smet, L.C.P.M. de Smet, Hermann Nirschl

A major challenge in nanotechnology is that of determining how to introduce green and sustainable principles when assembling individual nanoscale elements to create working devices. For instance, textile nanofinishing is restricted by the many constraints of traditional pad-dry-cure processes, such as the use of costly chemical precursors to produce nanoparticles (NPs), the high liquid and energy consumption, the production of harmful liquid wastes, and multistep batch operations. By integrating low-cost, scalable, and environmentally benign aerosol processes of the type proposed here into textile nanofinishing, these constraints can be circumvented while leading to a new class of fabrics. The proposed one-step textile nanofinishing process relies on the diffusional deposition of aerosol NPs onto textile fibers. As proof of this concept, we deposit Ag NPs onto a range of textiles and assess their antimicrobial properties for two strains of bacteria (i.e., Staphylococcus aureus and Klebsiella pneumoniae). The measurements show that the logarithmic reduction in bacterial count can get as high as ca. 5.5 (corresponding to a reduction efficiency of 99.96%) when the Ag loading is 1 order of magnitude less (10 ppm; i.e., 10 mg Ag NPs per kg of textile) than that of textiles treated by traditional wet-routes. The antimicrobial activity does not increase in proportion to the Ag content above 10 ppm as a consequence of a "saturation" effect. Such low NP loadings on antimicrobial textiles minimizes the risk to human health (during textile use) and to the ecosystem (after textile disposal), as well as it reduces potential changes in color and texture of the resulting textile products. After three washes, the release of Ag is in the order of 1 wt %, which is comparable to textiles nanofinished with wet routes using binders. Interestingly, the washed textiles exhibit almost no reduction in antimicrobial activity, much as those of as-deposited samples. Considering that a realm of functional textiles can be nanofinished by aerosol NP deposition, our results demonstrate that the proposed approach, which is universal and sustainable, can potentially lead to a wide number of applications.@en

Hybrid polyelectrolyte-anion exchange membrane and its interaction with phosphate

Journal article - L. Paltrinieri, L. Paltrinieri, L. Poltorak, L. Chu, Theo Puts, Willem Van Baak, Ernst J. R. Sudhölter, L.C.P.M. de Smet, L.C.P.M. de Smet, L.C.P.M. de Smet

We have investigated in detail properties of hybrid polyelectrolyte-anion exchange membranes (AEMs) having different amounts of a guanidinium-modified poly(allylamine hydrochloride) (PAH-Gu) derivative (2, 5, and 8 wt%). The presence of guanidinium groups at the membrane surface ...

Hybrid polyelectrolyte-anion exchange membrane and its interaction with phosphate

Journal article - L. Paltrinieri, L. Paltrinieri, L. Poltorak, L. Chu, Theo Puts, Willem Van Baak, Ernst J. R. Sudhölter, L.C.P.M. de Smet, L.C.P.M. de Smet, L.C.P.M. de Smet

Improved phosphoric acid recovery from sewage sludge ash using layer-by-layer modified membranes

Journal article - L. Paltrinieri, L. Paltrinieri, Kirsten Remmen, Barbara Müller, L. Chu, Joachim Köser, Thomas Wintgens, Matthias Wessling, L.C.P.M. de Smet, L.C.P.M. de Smet, L.C.P.M. de Smet, Ernst J. R. Sudhölter

We report an advanced treatment method for phosphoric acid recovery from leached sewage sludge ash. Layer-by-layer (LbL) polyelectrolyte deposition has been used as a tool to modify and convert a hollow ultrafiltration membrane into a nanofiltration (NF) LbL membrane for H3PO4 re ...

Modified cation-exchange membrane for phosphate recovery in an electrochemically assisted adsorption-desorption process

Journal article - K.V. Petrov, L. Paltrinieri, L. Paltrinieri, L. Poltorak, L.C.P.M. de Smet, L.C.P.M. de Smet, Ernst J. R. Sudhölter

A novel ion separation methodology using a cation-exchange membrane modified with iron oxide nanoparticles (Fe3O4 NPs) coated with polyhexamethylene guanidine (PHMG) is proposed. The separation is performed in an electrodialysis cell, where firstly phosphate is electro-adsorbed t ...

Functionalized Anion-Exchange Membranes Facilitate Electrodialysis of Citrate and Phosphate from Model Dairy Wastewater

Journal article - L. Paltrinieri, L. Paltrinieri, Elisa Huerta, Theo Puts, Willem Van Baak, Albert B. Verver, Ernst J. R. Sudhölter, L.C.P.M. de Smet, L.C.P.M. de Smet, L.C.P.M. de Smet

In this study, the preparation of a new, functional anion-exchange membrane (AEM), containing guanidinium groups as the anion-exchanging sites (Gu-100), is described as well as the membrane characterization by XPS, water uptake, permselectivities, and electrical resistances. The ...

Fe<sub>3</sub>O<sub>4 </sub>nanoparticles coated with a guanidinium-functionalized polyelectrolyte extend the pH range for phosphate binding

Journal article - L. Paltrinieri, L. Paltrinieri, M. Wang, S. Sachdeva, N.A.M. Besseling, Ernst J. R. Sudhölter, L.C.P.M. de Smet, L.C.P.M. de Smet, L.C.P.M. de Smet

In this work commercially available Fe3O4 NPs were coated with polyallylamine hydrochloride (PAH) and PAH functionalized with guanidinium groups (PAH–Gu) for investigating the phosphate adsorption properties under alkaline conditions. The coating can be prepared easily and rapidl ...

Enhanced vapour sensing using silicon nanowire devices coated with Pt nanoparticle functionalized porous organic frameworks

Journal article - A. Cao, A. Cao, M. Shan, L.C.P.M. de Smet, L.C.P.M. de Smet, L.C.P.M. de Smet, L. Paltrinieri, L. Paltrinieri, W.H. Evers, L. Chu, L. Poltorak, Johan H. Klootwijk, B. Seoane de la Cuesta, B. Seoane de la Cuesta, J. Gascon Sabate, J. Gascon Sabate, Ernst J. R. Sudhölter

Recently various porous organic frameworks (POFs, crystalline or amorphous materials) have been discovered, and used for a wide range of applications, including molecular separations and catalysis. Silicon nanowires (SiNWs) have been extensively studied for diverse applications, ...

Enhanced vapour sensing using silicon nanowire devices coated with Pt nanoparticle functionalized porous organic frameworks

Recovery and esterification of aqueous carboxylates by using CO2-expanded alcohols with anion exchange

Journal article - C.I. Cabrera Rodriguez, L. Paltrinieri, L.C.P.M. de Smet, L.A.M. van der Wielen, Adrie J.J. Straathof

The recovery of carboxylic acids from fermentation broth is one of the main bottlenecks for the industrial production of bio-based esters. This paper proposes an alternative for the recovery of carboxylates produced by fermentations at pH values above the pKa of the carboxylic ac ...

Recovery and esterification of aqueous carboxylates by using CO2-expanded alcohols with anion exchange

Journal article - C.I. Cabrera Rodriguez, L. Paltrinieri, L.C.P.M. de Smet, L.A.M. van der Wielen, Adrie J.J. Straathof

Contributed

1 records found

Layer-by-layer modified anion-exchange membranes for phosphate recovery

Master thesis - A.B. Dwarkasing, L. Paltrinieri, L. Poltorak, Ernst J. R. Sudhölter

Ion exchange membranes (IEMs) are used to selectively transport ions between two solutions. Most membranes are not selective to certain ion species. This study investigates the possibility of increasing phosphate selectivity (in the form of H2PO4 – ) of anion exchange membranes (AEM) by modifying commercial AEMs with a Layer-by-Layer (LbL) assembly of a few promising candidate polyelectrolytes (PE): Poly(diallyldimethylammonium chloride) (PDADMAC), poly(allylamine hydrochloride) (PAH), and poly(allylamine hydrochloride)-Guanidinium (PAH-Gu). The anionic layer was composed of poly(sodium 4-styrene sulfonate) (PSS). Membranes were modified with 4 layers. This was done on only one side, the asymmetric modification ((PE/PSS)4), or both sides of the membrane, the symmetric modification ((PE/PSS)2). The membranes were then characterized using low-frequency impedance spectroscopy to obtain, among other parameters, the resistance of the membrane. Asymmetrically modified membranes showed non-reproducible impedance data, while their symmetric counterpart was in good agreement with a theoretical model. Compared to the bare membrane, a decrease in the membrane’s resistivity was found for all the modified membranes in the studied salt concentrations (0.1 to 0.4 M). In the low concentration region, the PAH-Gu modified membrane had the lowest resistance. This result is most likely caused by a high affinity between Guanidinium and phosphate. The electric properties of other parameters, such as diffusive boundary layer and electrical double layer resistance, were found to be independent from the membrane modification. We then performed permselectivity measurements with a competing anion, sulfate. To this end, electrodialysis was performed in the underlimiting current regime. Modified membranes showed no increase in discriminatory function for phosphate. This could be due to several reasons. For example, there might be a pH-change near the surface of the membrane, changing the charge of the phosphate anion. Additionally, the PAH-Gu membrane did show an increase in overall anion flux compared to the bare membrane. These results are promising and warrant further research into phosphate selective receptors in combination with IEMs.