Enhanced defluoridation and facile separation of magnetic nano-hydroxyapatite/alginate composite

Pandi, Kalimuthu; Viswanathan, Natrayasamy

doi:10.1016/j.ijbiomac.2015.06.019

Cited by 55 publications

(11 citation statements)

References 49 publications

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“…The XRD spectrum of the pure Fe 3 O 4 particles demonstrates the characteristic diffraction peaks at 30.2°, 35.5°, 43.2°, 53.6°, 57.0°, and 62.7° 2θ, corresponding to the (220), (311), (400), (422), (511), and (440) crystal planes, respectively. Similar characteristic peaks (marked with red solid circles) are observed for the PD3L4F2 MR_NCH, indicating the presence of Fe 3 O 4 nanoparticles 43 . Overall, XRD and FT-IR spectroscopy of the hydrogels confirmed that the NCHs and MR_NCHs were fabricated successfully, and adding either the laponite or Fe 3 O 4 particles in hydrogels induces the intermolecular interactions which cause an increase of the physical properties such as v e and of the mechanical properties such as stress at break (σ b ) and toughness.…”

Section: Resultssupporting

confidence: 69%

Highly Tough, Biocompatible, and Magneto-Responsive Fe3O4/Laponite/PDMAAm Nanocomposite Hydrogels

Lee

Han

Jang

et al. 2019

Sci Rep

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Magneto-responsive hydrogels (MRHs) have attracted considerable attention in various applications owing to their smart response to an externally applied magnetic field. However, their practical uses in biomedical fields are limited by their weak mechanical properties and possible toxicity to the human body. In this study, tough, biocompatible, and magneto-responsive nanocomposite hydrogels (MR_NCHs) were developed by the in-situ free-radical polymerization of N, N-dimethylacrylamide (DMAAm) and laponite and Fe3O4 nanoparticles. The effects of the concentrations of DMAAm, water, and laponite and Fe3O4 nanoparticles in the pre-gel solutions or mixtures on the viscoelastic and mechanical properties of the corresponding hydrogels were examined by performing rheological and tensile tests, through which the mixture composition producing the best MR_NCH system was optimized. The effects were also explained by the possible network structures of the MR_NCHs. Moreover, the morphology, chemical structure, and thermal and mechanical properties of the MR_NCHs were analyzed, while comparing with those of the poly(DMAAm) (PDMAAm) hydrogels and laponite/PDMAAm NCHs. The obtained optimal MR_NCH exhibited noticeable magnetorheological (MR) behavior, excellent mechanical properties, and good biocompatibility. This study demonstrates how to optimize the best Fe3O4/laponite/PDMAAm MR_NCH system and its potential as a soft actuator for the pharmaceutical and biomedical applications.

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Section: Resultssupporting

confidence: 69%

Highly Tough, Biocompatible, and Magneto-Responsive Fe3O4/Laponite/PDMAAm Nanocomposite Hydrogels

Lee

Han

Jang

et al. 2019

Sci Rep

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“…El 46,1% de las entidades territoriales que realizaron vigilancia presentaron valores de flúor en agua superiores a los permisibles (24 municipios) y el 70% en sal (53 municipios), lo cual corresponde a cerca del 30% de las entidades territoriales del país con riesgo en agua en algún municipio y cerca del 40% con riesgo en sal. Esta información es insumo importante para los tomadores de decisiones porque deben plantearse estrategias de intervención de la fuente, por ejemplo acciones de inspección, vigilancia y control en sal por parte del Instituto Nacional de Vigilancia de Medicamentos y Alimentos INVIMA (19), cambio en las fuentes de abastecimiento de agua, lo que podría implicar localización de nuevos pozos, estrategias de acceso a agua potable en zonas rurales (acueductos rurales) (20), defluoruración de fuentes existentes (21)(22)(23)(24)(25)(26)(27), actualización de los mapas de riesgo de la calidad del agua para consumo humano (28) que incluya el parámetro flúor, entre otros.…”

Section: Mapa N° 1 Municipios Y Departamentos Con Contenidos De Flúor En Agua Y Sal Por Encima De Los Permisibles Vigilancia De La Exposiunclassified

Áreas de riesgo por exposición a flúor, Colombia 2012 – 2015

Castrillón¹,

Valencia

2017

Inf. epidemiol. nac

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Introducción: la ingesta de flúor puede tener efectos benéficos como la reducción de la incidencia de caries dental, o negativos, causando fluorosis dental o esquelética. La ingesta excesiva de flúor usualmente ocurre a través del consumo de fuentes naturales (aguas) o artificiales (adicionado a la sal o a las cremas dentales). Objetivo: describir los contenidos de flúor en agua y sal y sus ubicaciones geográficas en Colombia durante el periodo 2012-2015. Métodos: análisis descriptivo retrospectivo de los resultados de la vigilancia de flúor en agua y sal entre 2012 y 2015 con fuente secundaria de información (laboratorios departamentales y distritales de salud pública y SIVICAP). Los valores máximos permisibles para agua fueron 0,5-1ppm y para sal 180 - 220ppm. La información fue analizada mediante distribución de frecuencias y se presentaron los resultados en tablas, gráficas y mapas. Resultados: fueron analizadas 9 245 muestras de agua en 24 entidades territoriales y 1 439 muestras de sal en 20 entidades territoriales. Caldas, Casanare, Cesar Guainía, Nariño y Santander presentaron muestras con valores de flúor superior a los permisibles en agua. Amazonas, Antioquia, Atlántico, Bogotá, Bolivar, Cundinamarca, Norte de Santander, Quindío y Santa Marta en sal. Boyacá, Caldas, Huila, Tolima y Valle del Cauca en agua y sal. Conclusión: existen 27,8% entidades territoriales que presentan valores de flúor superiores a los permitidos en agua y 38,9% en sal, estas fuentes podrían representar un riesgo para la infoxicación crónica por flúor y deben ser intervenidas para minimizar los riesgos en la población que las consume.

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“…Both metals are widely used as catalysts for a variety of processes, their wide usage can be attributed to their several characteristics such as being very strong catalytic, optical, electrical, mechanical and antifungal/antibacterial. Moreover, Copper (Cu) has been used in catalyst based on the activated carbon (AC), nano-zerovalent copper (nZVCu) functionalized hydroxyapatite (HA), alginate [24,25,26] and on the perovskite (LaNiO 3 , NaNi 0.9 Cu 0.1 O 3 and LaNi 0.5 Cu 0 . 5 O 3 ) [27,28].…”

Section: Introductionmentioning

confidence: 99%

Copper nickel co-impregnation of Moroccan yellow clay as promising catalysts for the catalytic wet peroxide oxidation of caffeine

Assila

Zouheir

Tanji

et al. 2021

Heliyon

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Copper and nickel were incorporated into the prepared yellow clay (YC) using one of the most widely used methods, for the preparation of heterogeneous catalysts, which is the wet impregnation method (IPM) and its application as a heterogeneous catalyst for Caffeine (CAF). Several catalysts Cooper Nickel's Catalysts (Cu-Ni) were applied to the yellow clay with different weight ratio of Cu and Ni, in order to explore the role of both metals during the catalytic oxidation process CWPO. Furthermore, the CuNi-YC catalysts, were characterized by X-ray diffraction (XRD), X-ray fluorescence (XRF), Langmuir's surface area, Brunauer Emmett Teller (BET), scanning electron microscope (SEM) and inductively Coupled Plasma-Atomic Emission Spectrometry (ICP-AES), so as to get a better understanding concerning the catalytic activity's behavior of CuNi-YC catalysts. The optimization of the catalytic activity's effects on the different weight ratios of Cu and Ni, temperature and H 2 O 2 were also examined, using Box-Behnken Response Surface Methodology RSM to enhance the CAF conversion. The analysis of variances (ANOVA) demonstrates that Box-Behnken model was valid and the CAF conversion reached 86.16%, when H 2 O 2 dosage was equal to 0.15 mol.L À1 , copper impregnated (10%) and temperature value attained 60 C. In addition, the regeneration of catalyst's cycles under the optimum conditions, indicated the higher stability up to four cycles without a considerable reduction in its conversion performance.

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Enhanced defluoridation and facile separation of magnetic nano-hydroxyapatite/alginate composite

Cited by 55 publications

References 49 publications

Highly Tough, Biocompatible, and Magneto-Responsive Fe3O4/Laponite/PDMAAm Nanocomposite Hydrogels

Highly Tough, Biocompatible, and Magneto-Responsive Fe3O4/Laponite/PDMAAm Nanocomposite Hydrogels

Áreas de riesgo por exposición a flúor, Colombia 2012 – 2015

Copper nickel co-impregnation of Moroccan yellow clay as promising catalysts for the catalytic wet peroxide oxidation of caffeine

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