19 research outputs found
Porphyrin based-systems for the detection of recoverable metals from Li-Ion batteries : mini-review
The collection and recycling of metals, especially heavy metals, from all types of batteries is a major requirement of European Countries. Market studies highlighted that in the rechargeable battery field, lithium batteries are environmental friendly alternatives to the more polluting Ni-Cd batteries. Although lithium is not expected to bioaccumulate and its human and environmental toxicity are low, one source of lithium with impact to the environment is spent lithium batteries, due to the large variety of Li salts incorporated in polymer electrolyte membranes. Concerning to cathode, new trends are based on nanostructured lithium iron and manganese phosphate. Whatever are the metals involved in the cathode of batteries (Co-NiMn-Fe) the problem of controlling the efficiency of metals recovery is implying the use of sensor devices. In this paper we are concerned on porphyrin -based sensor devices for the rapid and accurate detection of Li, Ni, Mn
Electrochemical analysis of solid polymer electrolyte membranes used in lithium-based batteries : a literature survey
Electrochemical characterization of PVC-Pt(II) porphyrin-membrane
The maximum water volume fraction absorbed by membrane based on Pt(II)- 5,10,15,20-tetra(4-methoxy-phenyl)-porphyrin (PtTMeOPP) in poly(vinyl)chloride (PVC) matrix applied on iron substrate is 0.3 % and the permeability is 7.6×10−12 m 2 s −1 . After 24 h immersion in the 0.5 M 4-morpholinoethanesulfonic acid (MES) solution of pH = 5.5, the Nyquist representation of impedance data shows diffusion into the membrane of electrolytes from the buffer solution, causing a decrease of the membrane electric resistance, but no delamination was observed for immersion longer than 48 h. Furthermore, the coating resistance is still close to ~16000 ohm.cm−2 after 25 hours. This recommends this membrane as good material in potentiometric sensors design
Optical and electrochemical-mediated detection of ascorbic acid using manganese porphyrin and its gold hybrids
Hybrid Porphyrin-Polymeric Materials and their Amazing Applications: A Review
Porphyrins are versatile multifunctional biomimetic molecules that are obtained by condensation of pyrrole with the desired aromatic aldehydes. The porphyrin structure can be synthetically modified by either introduction of various peripheral functional groups or metals in its core, allowing creation of various porphyrin derivatives that exhibit amazing optoelectronic properties. This feature makes porphyrins molecules extremely useful especially in hybrid combination with photonic, electronic and magnetic compounds. This review is focused on the more recently obtained porphyrin-polymeric materials and on their various analytical, industrial and medical applications. The study underlines the assembling capacity of these porphyrin-polymer hybrids to form supramolecular tunable architectures by means of the association of more building block units. Porphyrin-polymer nano- and micro-materials play a preeminent role in sensing applications involving chromophores in the formulation of organic solar cells - due to their capacity to generate photo induced charge separation centers - and as new materials with interesting catalytic properties. Besides these technical applications, the photobactericidal activity of these porphyrin–polymer materials was evaluated against Gram positive and Gram negative strains bacteria and they represent an alternative to antibiotics in order to overcome the growing bacterial multiresistance. Polymer functionalization with porphyrin is commonly used to overcome some drawbacks such as self-quenching and photo-toxicity to the skin produced by the bare porphyrins, when used as photosensitizers in the non-invasive Photodynamic therapy of cancer (PDT)
Syntheses, Spectroscopic and AFM Characterization of Some Manganese Porphyrins and Their Hybrid Silica Nanomaterials
Trace Oxygen Sensitive Material Based on Two Porphyrin Derivatives in a Heterodimeric Complex
The successful preparation of a novel dimer complex formed between 5,10,15,20-tetrakis(3,4-dimethoxyphenyl)-porphyrin Fe(III) chloride and (5,10,15,20-tetraphenylporphinato) dichlorophosphorus(V) chloride using the well-known reactivity of the P–X bond is reported. The obtained complex was characterized by UV-vis, Fourier transform infrared spectroscopy (FT-IR), fluorescence, 1H-NMR, 13C-NMR, and 31P-NMR spectroscopic techniques and also by additional Heteronuclear Single Quantum Coherence (HSQC) and Heteronuclear Multiple Bond Correlation (HMBC) experiments in order to correctly assign the NMR signals. Scanning electron microscopy (SEM) and EDX quantifications completed the characterizations. This novel porphyrin dimer complex demonstrated fluorescence sensing of H2O2 in water for low oxygen concentrations in the range of 40–90 µM proving medical relevance for early diagnosis of diseases such as Alzheimer’s, Parkinson’s, Huntington’s, and even cancer because higher concentrations of H2O2 than 50 μM are consideredcytotoxic for life. Due to its optical properties, this novel metalloporphyrin–porphyrin based complex is expected to show PDT and bactericidal activity under visible-light irradiation
JSCS-3232 Original scientific paper
Styrene-divinylbenzene copolymer grafted with phosphonic acid dialkylester
Trace Oxygen Sensitive Material Based on Two Porphyrin Derivatives in a Heterodimeric Complex
Hybrid silica-porphyrin materials with tailored pore sizes
This study is concerning about optical and morphological properties of novel porphyrin doped silica
materials consisting in 5,10,15,20-tetrakis(4-allyloxyphenyl)porphyrin (TAPP) encapsulated in silica
matrices, exhibiting intensive absorption of light in the red-near IR region. The silica-porphyrin materials
were prepared by the sol–gel process, by using different porphyrin immobilization schemes: in situ and by
impregnation. As starting materials tetraethoxysilane and isobuthyltrietoxysilane, as silica precursors, Nbuthyl-
3-methylpyridinium tetrafluoroborate ionic liquid, as additive, and hydrochloric acid and sodium
fluoride, as catalysts, were used. The obtained hybrid porphyrin-silica materials were characterized by
using BET measurements (Brunauer–Emmett–Teller analysis), thermal analysis, FT-IR, fluorescence and
UV–vis spectroscopy techniques. UV–vis behavior and fluorescence emissions and excitations were
evaluated in terms of synthesis stages and immobilization processes. The obtained hybrid porphyrin-silica
materials presented increasedfluorescenceemission withmaximasituated atabout655 nmand 715 nmin
comparison with the porphyrin base that make these transparent materials candidates for second
generation photosensitizers. BET analysis revealed that every introduction of TAPP causes decreasing on
surface area of the nanomaterial. Although, when the porphyrin is immobilized by in situ method the
reduction is lower than in case of using impregnation method, that is leading to the conclusion that the
porphyrin is placed inside on the silica network in both studied cases, independent of the performed
method of immobilization. The pore size is narrowly distributed in the range of 1.97–3.81 nm for in situ
obtained materials and in the range of 3.07–4.62 for hybrids obtained by impregnation. These materials
with tunable pore sizes diameter are promising for building of sensor devices