Silsesquioxane 3-n-Propylpyridinium chloride: a new polymer for the potentiometric analysis of Cr(VI) in electroplating and leather industry wastes

Abstract

Um novo polímero, cloreto de 3-n-propilpiridínio-silsesquioxano (SiPy + Cl -), foi utilizado na preparação de um eletrodo. Este eletrodo íon seletivo, formado de um bastão de grafite recoberto pelo polímero, foi construído e avaliado pela determinação de Cr(VI) em amostras de águas residuárias de indústrias de galvanoplastia e de couro. O eletrodo exibiu uma resposta Nernstiana para Cr(VI) entre as concentrações 3,1×10-6 e 1,8×10 -2 mol L -1 e limite de detecção de 2,8×10-6 mol L -1 (0,15 ppm). A resposta do eletrodo para Cr(VI) foi rápida (15 s) e o potencial independente do pH na faixa de 3,0 a 7,0. Os coeficientes de seletividade para diversos ânions mostram que o eletrodo apresenta um excelente desempenho. O sensor exibe um tempo de vida útil de 6 meses com boa reprodutibilidade. A determinação de Cr(VI) em águas residuárias de indústrias de galvanoplastia e de couro usando o sensor foi realizada com sucesso.A new polymer, silsesquioxane 3-n-propylpyridinium chloride (SiPy + Cl -), was used in the preparation of an electrode. The polymer coated graphite rod ion selective electrode for Cr(VI) was constructed and evaluated for the determination of Cr(VI) in samples of electroplating and leather industry wastes. This electrode exhibited a Nernstian response for Cr(VI) concentrations between 3.1×10 -6 and 1.8×10 -2 mol L -1 and a detection limit of 2.8×10 -6 mol L -1 (0.15 ppm). The response of the electrode for Cr(VI) was fast (15 s) and the independent potential of pH in the range of 3.0 to 7.0. The selectivity coefficients for several anions showed that the electrode presents excellent performance. The sensor exhibits a shelf-life of 6 months with good reproducibility. Determination of Cr(VI) in electroplating and leather wastes using the sensor was successfully achieved.

Removal of metallic ions from ethanol solutions with modified natural cotton fiber

“…The band of high intensity at 1108 cm −1 and a band of medium intensity at 460 cm −1 (in b), can be attributed to the stretching mode of the skeleton SiO and to the deformation mode of the SiOSi, respectively 13. It can be also observed vibrational bands characteristic of the pyridinium ring at 1635(s), 1580(w), 1502(sh), and 1487(s) cm −1 (where s = strong, w = weak, and sh = shoulder), whose values agree very well to those registered for silsesquioxane 3‐ n ‐propylpyridinium chloride obtained previously 14…”

Antibacterial and Cytotoxic Activities of Copper-Functionalized Silsesquioxane 3-n-Propylpyridinium Chloride

“…This organosilicate also shows suitable adhesion and ion adsorption features, which provide highly desirable multifunctional physicochemical properties and remarkable applications [3]. Some studies have investigated its use as adsorbent material [4] for preparing electrodes [5,6] and sensors [7]. Besides, SiPy + Clcan undergo structural changes for obtaining organic-inorganic hybrid compounds, which play an important role in providing a chemical platform for discovery of novel materials [3].…”

A solid state Cr(VI) ion-selective electrode based on polypyrrole

“…Some potentiometric sensors based on liquid membranes or PVC membranes for chromium(VI) analysis containing modifiers such as cyclic amines, diaza crown ethers, Rhodamine-B, cryptands, porphyrines or calixarene ionophores have been reported previously [14][15][16][17][18][19][20][21]. In spite of availability of a number of Cr(VI) sensors, their use for Cr(VI) estimation has been limited, because they have shown interference by cations such as Cu 2+ , Hg 2+ and Pb 2+ ions or anions such as CH 3 COO -, Cland SO 4 2-, work over narrow concentration range and nonNernstian response.…”

“…Chemically modified electrodes (CME) with conductive polymers have been found to be much more interesting because of the combination of tunable chemical and electronic properties of conducting polymers [21][22][23]. Conducting electroactive polymers such as polypyrrole (PPy) and polyaniline (PAni) have attracted many investigators in recent years due to their interesting electrical and electrochemical behaviors [24,25].…”