Pure and Fe-doped TiO2 nanoparticles were synthesized by the sol–gel method. The samples were characterized by X-ray diffraction, Raman spectroscopy, BET, UV-vis diffuse reflectance spectroscopy, and scanning electron microscopy. The results show a dependence between the crystallite size and the amount of dopant, which decreases from 13.02 to 12.81 nm. The same behavior was observed in the optical properties, where the band gap decreased from 3.2 to 2.86 eV. The arsenic (V) adsorption was tested in aqueous solution containing 5 mg/L of arsenic and 0.5 g/L of adsorbent at pH 7 and in dark conditions. The results indicate that the TiO2-B sample shows a higher arsenic removal, reaching 88% arsenic removal from the water at pH 7. Thus, it is also shown that the best performance occurs at pH 5, where it reaches an arsenic removal of 94%. Ion competition studies show that arsenic removal capacity is slightly affected by chloride, carbonate, nitrate, and sulfate ions. According to the results, the synthesized samples are a promising material for treating arsenic-contaminated water.

La solución de la ecuación de Laplace dentro de un curso de Electrodinámica Clásica es fundamental para el entendimiento de los problemas de contorno en Electrostática. En el presente trabajo de investigación se obtiene la solución analítica y numérica por el método de relajación, de un problema de placas paralelas infinitas, de la ecuación de Laplace en coordenadas cartesianas en un espacio euclidiano bi-dimensional, específicamente usando el lenguaje de programación Python, para su uso en la enseñanza de la Física y su mejor comprensión fenomenológica. Así mismo, se compara y discute las soluciones obtenidas por ambas técnicas de solución.