Passion-fruit shell biomass as adsorbent material to remove chromium III from contaminated aqueous mediums

ABSTRACT The aim of the study was to evaluate an adsorbent material based on passion-fruit shell biomass (PFSB) for chromium III removal from contaminated aqueous mediums, composed of distilled water and different concentrations of Cr(III), with a dose of 5 g of PFSB per liter. The residual concentration of Cr(III) in the treated mediums was determined by Atomic Absorption Spectrophotometry. A good adsorption process was carried out, achieving removal levels up to 85, 80, and 53% for solutions of 20, 50 and 200 ppm of Cr(III), respectively. The results showed an adequate fit to Langmuir and Freundlich models (R2 of 0.8864 and 0.7596, respectively), obtaining the following parameters qmax: 27.933 mg g−1and b: 0.029 (for Langmuir model), and k: 1.400 and n: 1.650 (for Freundlich model), with a good adsorbent-adsorbate interaction for Cr(III) according to FT-IR spectra. Therefore, the obtained results suggest that Cr(III) can be removed by more than 50% by using passion-fruit shell, which with a minimum treatment could be used as an adsorbent in the treatment of chromium-contaminated aqueous mediums

Fitorremediación de suelos contaminados con metales pesados mediante cultivo de geranio (Pelargonium zonale)

La fitorremediación es una técnica que aprovecha la capacidad remediadora de ciertas plantas para absorber, acumular, estabilizar o reducir los contaminantes del suelo, entre ellos los metales pesados. El objetivo del presente estudio ha sido evaluar la capacidad del geranio para remover metales como arsénico (As), cadmio (Cd) y cobre (Cu) de suelos contaminados. El trabajo fue realizado en condiciones ex situ, con muestras de suelo del botadero El Milagro de la ciudad de Trujillo, entre los meses de abril a junio de 2016. Las concentraciones de los metales en las muestras de suelo fueron determinadas mediante Espectroscopia de Emisión Atómica de Plasma Acoplado por Inducción (ICP‐AES). Las concentraciones de As, Cd y Cu disminuyeron significativamente en las muestras de suelo mediante el cultivo de geranio. Se observó una tolerancia significativa del geranio hacia el As, con una disminución significativa, hasta del 74% con respecto al nivel inicial, mientras que para el Cd y Cu, se logró disminuciones de hasta 79% y 55%, respectivamente. Lo cual demuestra que la fitorremediación es una interesante alternativa para la recuperación de ecosistemas contaminados con metales pesados

ZnO nanoparticles obtained by green synthesis as an alternative to improve the germination characteristics of L. esculentum

Tomatoisanimportantcropduetoitsnutritionalcontributionsandorganolepticproperties, which make it an appetizing vegetable around the world. In its sowing, the use of seed is the most accessible propagation mechanism for farmers. However, the induction to germination and emergence is often limited in the absence of stimulants that promote the development and growth of the seedling, added to the interference of infectious agents that notoriously reduce the vitality and viability of the seed. Given this, it was proposed as a research objective to determine the effect of zinc oxide nanoparticles (ZnO NPs) mediated by a green route on the germinative characteristics of Lycopersicon esculentum Mill. 1768 “tomato”. The experimental phase consisted of the synthesis of ZnO NPs and its subsequent characterization. After its synthesis, its inoculation was conducted during the germination of seeds of L. esculentum, considering six sample groups for the treatment with zinc nanoparticles (T1: Control; T2: 21.31 ppm; T3: 33.58 ppm; T4: 49.15 ppm; T5: 63.59 and T6: 99.076 ppm). The results indicate that concentrations close to 100 ppm of ZnO NPs are ideal in the treatment of L. esculentum seeds, due to the promotion of enzymatic and metabolic activity to achieve cell elongation; likewise, the biosynthesized nanoparticles showed no phytotoxicity, due to the fact that, in all the treatments, there were processes of germination and emergence. This was linked to the generation of a Zn0-phenolate complex through a chelating effect, which generates compatibilitywiththeseedand,comparedtoclassicinorganicsynthesis,usuallyshowsphytotoxicity. In this sense, green synthesis is presented as a great alternative in this type of application

Adsorption of lead (Pb) from contaminated aqueous mediums using banana (Musa paradisiaca) peel [Adsorción de plomo (Pb) de aguas contaminadas mediante cáscara de plátano (Musa paradisiaca)]

RESUMEN El objetivo del estudio fue evaluar la viabilidad para remover plomo (Pb) de aguas contaminadas utilizando biomasa de cáscara de plátano. Se evaluaron el tamaño de partícula de la biomasa y el tiempo de contacto, obteniendo la mayor remoción mediante el tamiz de malla #60 a los 30 minutos de contacto, con un nivel de remoción de Pb mayor al 98%. Los resultados sugieren el potencial de remoción de Pb utilizando cáscara de plátano, el cual con un mínimo tratamiento podría usarse como adsorbente en el tratamiento de aguas contaminadas.ABSTRACT The aim of the study was to evaluate the feasibility to remove lead (Pb) from contaminated waters using banana peel biomass. Particle size of the biomass and contact time were evaluated, obtaining the higher removal capacity by the #60 mesh sieve at 30 minutes of contact time, with a removal level of Pb greater than 98%. The obtained results suggest the potential for Pb removal using banana peel, which with a minimum treatment could be used as adsorbent in the treatment of contaminated waters

Adsorbent material based on passion-fruit wastes to remove lead (Pb), chromium (Cr) and copper (Cu) from metal-contaminated waters

ABSTRACT The aim of the present work was to evaluate the feasibility of passion-fruit shell (PFS) biomass as adsorbent material to remove heavy metals from contaminated waters. Model mediums were used, which were composed of distilled water and the respective metal: lead (Pb), chromium (Cr) and copper (Cu), with a dose of 10g of dry PFSbiomass per liter of medium. The residual concentration of each metal was determined by Atomic Absorption Spectrophotometry (AAS). A good adsorption capacity was exhibited by this agro industrial waste, achieving removal levels of 96,93 and 82% for Pb, Cr and Cu, respectively. In addition, the results obtained showed an adequate fit to the Freundlich model (R2 > 0.91), on the basis of which, the following values of adsorption capacity (k: 1.7057, 0.6784, 0.3302) and adsorption intensity (n: 0.6869, 2.3474, 1.0499), for Pb, Cr and Cu respectively, were obtained. Our results suggest that Pb, Cr and Cu ions can be removed by more than 80% by using this agro industrial waste, which with a minimum treatment could be used as an adsorbent material in the treatment of metal-contaminated waters

ZnO Nanoparticles Obtained by Green Synthesis as an Alternative to Improve the Germination Characteristics of L. esculentum

Tomato is an important crop due to its nutritional contributions and organoleptic properties, which make it an appetizing vegetable around the world. In its sowing, the use of seed is the most accessible propagation mechanism for farmers. However, the induction to germination and emergence is often limited in the absence of stimulants that promote the development and growth of the seedling, added to the interference of infectious agents that notoriously reduce the vitality and viability of the seed. Given this, it was proposed as a research objective to determine the effect of zinc oxide nanoparticles (ZnO NPs) mediated by a green route on the germinative characteristics of Lycopersicon esculentum Mill. 1768 “tomato”. The experimental phase consisted of the synthesis of ZnO NPs and its subsequent characterization. After its synthesis, its inoculation was conducted during the germination of seeds of L. esculentum, considering six sample groups for the treatment with zinc nanoparticles (T1: Control; T2: 21.31 ppm; T3: 33.58 ppm; T4: 49.15 ppm; T5: 63.59 and T6: 99.076 ppm). The results indicate that concentrations close to 100 ppm of ZnO NPs are ideal in the treatment of L. esculentum seeds, due to the promotion of enzymatic and metabolic activity to achieve cell elongation; likewise, the biosynthesized nanoparticles showed no phytotoxicity, due to the fact that, in all the treatments, there were processes of germination and emergence. This was linked to the generation of a Zn0-phenolate complex through a chelating effect, which generates compatibility with the seed and, compared to classic inorganic synthesis, usually shows phytotoxicity. In this sense, green synthesis is presented as a great alternative in this type of application