During the gold extraction in opencast mining, many hazardous substances, such as cyanide, are spilled into the water bodies. This study's aim was to develop a novel rotary photocatalytic TiO2-based reactor to remove cyanide from polluted water using a rotary concentrator photoreactor (RCPR). This pilot-scale reactor was tested with synthetic cyanide water at concentrations from 0.05 to 50 ppm, varying the pH and commercial TiO2 load. The optimal conditions from experimental data were 87.4% of cyanide removal and catalyst load of 0.30 g/L at pH 9.5. Further, samples of cyanide water from an opencast gold mine were treated, achieving removal of 68.7% after 240 min. Our value-added is the rotary motion of the set of four glass tubes, achieving satisfactory performance, which is promising for cyanide wastewater treatment with a more compact footprint than a standard CPC solar photoreactor. Thus, it was possible to reduce mass and heat transfer limitations with a simple design by considering this photoreactor as a photocatalytic process intensifier.
Tribolium castaneum es una plaga que infesta los productos agrícolas almacenados, principalmente granos. Una alternativa de control son los productos naturales, destacándose los aceites esenciales. Se evaluó la actividad repelente del aceite esencial de Bursera graveolens Jacq. ex L. contra T. castaneum aplicando el método de área de preferencia. Los resultados muestran diferencias significativas (p menor que 0.005) entre el área tratada y no tratada en las dosis 0.02, y 0.2 µL/cm2 luego de dos horas de exposición. Dicha actividad decreció al aumentar el tiempo de exposición. En conclusión, el aceite esencial de B. graveolens podría ser un repelente efectivo contra este insecto plaga.
Tribolium castaneum (Herbst, 1797) is a plague that infest store products, mainly grains. One alternative to control it is the use of natural products, highlighting the essential oils. It was evaluated the repellent activity of the essential oil of Bursera graveolens Jacq. ex L. towards T. castaneum. Results shows significant differences (p less than 0.005) between the treated area and the non trated area at 0.02, and 0.2 µL/cm2 doses after two hours of exposition. Repellent activity decreased when the time of exposition increased. In conclusión, the essential oil of B. graveolens could be an effective repellent against plague insects, being also this report the first related to repellency in this plant.
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