Pilot-scale modification of polyethersulfone membrane with a size and charge selective nanocellulose layer

Pöhler, Tiina; Mautner, Andreas; Aguilar-Sánchez, Andrea; Hansmann, Björn; Kunnari, Vesa; Grönroos, Antti; Rissanen, Ville; Siqueira, Gilberto; Mathew, Aji P.; Tammelin, Tekla

doi:10.1016/j.seppur.2021.120341

Cited by 14 publications

(8 citation statements)

References 60 publications

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“…On the ta-C surface, a moderately hydrated BSA layer is instantly formed and irreversibly attached (Figure a,b). Similar adsorption profile and adsorbed amount range has been recorded with QCM ( Δf between −20 and −40 Hz) for adsorption of BSA from aqueous solution on other hydrophobic or polymeric surfaces (CH 3 -modified gold, polyester, polystyrene). Adsorption of BSA on the SCNC surface is only minor, as indicated by the low values of Δf and ΔD (Figure a,b).…”

Section: Resultssupporting

confidence: 66%

Protein Adsorption and Its Effects on Electroanalytical Performance of Nanocellulose/Carbon Nanotube Composite Electrodes

et al. 2023

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Protein fouling is a critical issue in the development of electrochemical sensors for medical applications, as it can significantly impact their sensitivity, stability, and reliability. Modifying planar electrodes with conductive nanomaterials that possess a high surface area, such as carbon nanotubes (CNTs), has been shown to significantly improve fouling resistance and sensitivity. However, the inherent hydrophobicity of CNTs and their poor dispersibility in solvents pose challenges in optimizing such electrode architectures for maximum sensitivity. Fortunately, nanocellulosic materials offer an efficient and sustainable approach to achieving effective functional and hybrid nanoscale architectures by enabling stable aqueous dispersions of carbon nanomaterials. Additionally, the inherent hygroscopicity and fouling-resistant nature of nanocellulosic materials can provide superior functionalities in such composites. In this study, we evaluate the fouling behavior of two nanocellulose (NC)/multiwalled carbon nanotube (MWCNT) composite electrode systems: one using sulfated cellulose nanofibers and another using sulfated cellulose nanocrystals. We compare these composites to commercial MWCNT electrodes without nanocellulose and analyze their behavior in physiologically relevant fouling environments of varying complexity using common outer-and inner-sphere redox probes. Additionally, we use quartz crystal microgravimetry with dissipation monitoring (QCM-D) to investigate the behavior of amorphous carbon surfaces and nanocellulosic materials in fouling environments. Our results demonstrate that the NC/MWCNT composite electrodes provide significant advantages for measurement reliability, sensitivity, and selectivity over only MWCNT-based electrodes, even in complex physiological monitoring environments such as human plasma.

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Section: Resultssupporting

confidence: 66%

Protein Adsorption and Its Effects on Electroanalytical Performance of Nanocellulose/Carbon Nanotube Composite Electrodes

et al. 2023

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“…Hence, the zeta potential of the PES membrane is typically strongly negative as reported by Pöhler et al with approx. −40 mV in the pH range 8–10 and increases toward isoelectricity for a decreasing pH, almost reaching the isoelectric point at pH 2 . The negatively charged groups of the membrane interact with the positively charged cations (e.g., the Cu 2+ cations) and therefore may cause an undesired retention of cations by Coulomb interaction, which was also reported for several other common filtration membrane materials .…”

Section: Introductionsupporting

confidence: 60%

“…−40 mV in the pH range 8–10 and increases toward isoelectricity for a decreasing pH, almost reaching the isoelectric point at pH 2. 33 The negatively charged groups of the membrane interact with the positively charged cations (e.g., the Cu 2+ cations) and therefore may cause an undesired retention of cations by Coulomb interaction, which was also reported for several other common filtration membrane materials. 34 Apparently, divalent or trivalent cations exhibit stronger electrostatic interactions with the negative surface charges.…”

Section: Introductionmentioning

confidence: 67%

“…Furthermore, the pH of media, in an ecotoxicological context, is typically in the range of 5–8. In this range, the PES membrane is strongly negatively charged and the speciation of Cu is mainly controlling the interaction with the PES membrane and may be reduced due to the formation of neutral or negatively charged complexes (e.g., increase of the neutral [Cu(OH) 2 ] and negatively charged [Cu(OH) 3 ] − species with increasing pH > 8). Additionally, common anions like carbonate CO 3 2– or sulfide S 2– and the presence of DOM (e.g., humic acid) are known to form complexes and bind strongly to Cu 2+ . , In case the molecular weight of the DOM binding the Cu 2+ is larger than the MWCO of the membrane, a large part of the Cu 2+ would be retained by the membrane, like it was shown for, for example, Ag + and proteins .…”

Section: Resultsmentioning

confidence: 99%

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Improving Membrane Filtration for Copper Speciation: Optimal Salt Pretreatments of Polyethersulfone Membranes to Prevent Analyte Retention

et al. 2023

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Membrane filtration has been increasingly used to separate dissolved metal ions from dispersed particles, commonly using ultrafiltration membranes, for example, polyethersulfone (PES) membranes with a molecular weight cut-off of 3 kDa. The disadvantage of this technique is an undesired retention of ions, resulting from Coulomb interactions with sulfonic acid groups of the membrane. Therefore, such a membrane acts similar to a cation exchanger column. We solved this drawback by a pretreatment of the PES membrane by other cations. Using CuSO 4 as a model compound, we compared the effectiveness of five cations using their salt solutions (Ca 2+ , Mg 2+ , Fe 2+ , Ag + , Ba 2+ ) as pretreatment agents and identified the most effective pretreatment component for a high recovery of copper ions. After membrane filtration without pretreatment, only 52 ± 10%, 64 ± 5%, 75 ± 8%, and 89 ± 7% of nominal Cu concentrations were obtained using initial concentrations of 0.2, 0.5, 1.0, and 4.0 mg L −1 , respectively. The efficiency of the investigated cations increased in the order Fe < Ag < Mg < Ca < Ba. Furthermore, we analyzed the most efficient concentration of the pretreatment agent. The best performance was achieved using 0.1 mol L −1 CaCl 2 which increased copper recovery to slightly below 100%, even at the lowest tested Cu concentration (recovery 93 ± 10% at 0.2 mg L −1 ). In the environmentally relevant Cu concentration range of 0.2 mg L -1 , 0.1 mol L −1 BaCl 2 was identified as the most efficient pretreatment (103 ± 11%).

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“…Previous studies have shown that the surface roughness of the reinforced material MXene can affect its distribution in the polymer matrix, 55,56 thereby further influencing the load transfer capability between the two. [57][58][59] A low pull-out speed (5 m/s) was first adopted, and the extraction process is shown in Figure 8A, B. The relationship between the interaction energy and displacement during the pull-out process was subsequently obtained, as shown in Figure 9A.…”

Section: Interfacial Mechanical Propertiesmentioning

confidence: 99%

Understanding significantly reinforced polymethyl methacrylate composites induced by two‐dimensional Ti_n+₁C_n from an atomistic perspective

He,

Li,

et al. 2023

Polymer Composites

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MXenes, which have good reinforcing and toughening effects, can serve as excellent polymer additives. However, the mechanism whereby MXenes act has not been revealed. In this study, to understand the reinforcement effect of Tin+1Cn on polymethyl methacrylate (PMMA) from an atomistic perspective, we used molecular dynamics to conduct unidirectional tensile simulations of PMMA composites reinforced with monolayer Ti2C and Ti3C2 sheets. The results showed that Ti3C2 can more significantly improve the mechanical properties of the PMMA polymer than Ti2C, and the yield stress and Young's modulus of the Ti3C2/PMMA complexes were respectively 54.39% and 73.46% higher than the Ti2C/PMMA complexes. To further reveal the interaction mechanism between Tin+1Cn and PMMA, different separation speeds were used to simulate the pull‐out of Tin+1Cn from the PMMA matrix. The results showed that, in addition to the enhancement of interfacial strength by non‐bonding van der Waals forces, there were TiO and CTi bonds between Tin+1Cn and PMMA, which further increased the interfacial strength. Ti3C2 formed a denser interfacial region with PMMA, it could more effectively resist the formation and expansion of cracks. These findings may provide an important theoretical basis to design new type of MXene/polymer composites with excellent mechanical properties.Highlights MXene greatly improved the mechanical properties of the PMMA matrix. Formation of chemical bonds improved connection between the MXene and PMMA. The addition of MXene slows down the rate of crack propagation in PMMA.

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Pilot-scale modification of polyethersulfone membrane with a size and charge selective nanocellulose layer

Cited by 14 publications

References 60 publications

Protein Adsorption and Its Effects on Electroanalytical Performance of Nanocellulose/Carbon Nanotube Composite Electrodes

Protein Adsorption and Its Effects on Electroanalytical Performance of Nanocellulose/Carbon Nanotube Composite Electrodes

Improving Membrane Filtration for Copper Speciation: Optimal Salt Pretreatments of Polyethersulfone Membranes to Prevent Analyte Retention

Understanding significantly reinforced polymethyl methacrylate composites induced by two‐dimensional Ti_n+₁C_n from an atomistic perspective

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Pilot-scale modification of polyethersulfone membrane with a size and charge selective nanocellulose layer

Cited by 14 publications

References 60 publications

Protein Adsorption and Its Effects on Electroanalytical Performance of Nanocellulose/Carbon Nanotube Composite Electrodes

Protein Adsorption and Its Effects on Electroanalytical Performance of Nanocellulose/Carbon Nanotube Composite Electrodes

Improving Membrane Filtration for Copper Speciation: Optimal Salt Pretreatments of Polyethersulfone Membranes to Prevent Analyte Retention

Understanding significantly reinforced polymethyl methacrylate composites induced by two‐dimensional Tin+1Cn from an atomistic perspective

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Understanding significantly reinforced polymethyl methacrylate composites induced by two‐dimensional Ti_n+₁C_n from an atomistic perspective