Publications by authors named "Edgar Ruiz-Ruiz"
The degradation of asulam herbicide by photo electro-Fenton (PEF) and solar photo electro-Fenton (SPEF) processes was studied using an undivided electrochemical BDD/carbon-felt cell to generate HO continuously. A central composite design combined with response surface methodology was applied to determine the optimal operating conditions of current intensity = 0.30 A, [Fe] = 0.
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- A new automated method was developed for analyzing certain chemicals (methylparaben, propylparaben, benzophenone-3, and benzophenone-4) in water, using solid-phase extraction with high-performance liquid chromatography (HPLC) and ultraviolet detection.
- The study identified key parameters for optimizing the extraction process, confirming that certain volumes and compositions of solvents significantly improved analysis efficiency.
- The method proved to be fast, sensitive, and cost-effective, with successful application in testing swimming pool and wastewater samples, achieving reliable recovery rates.
Non-steroidal anti-inflammatory drugs (NSAID) are compounds frequently found in municipal wastewater and their degradation by conventional wastewater treatment plants (WWTP) is generally incomplete. This study compared the efficiency of two advanced oxidation processes (AOP), namely heterogeneous photocatalysis (HP) and electro-Fenton (EF), in the degradation of a mixture of common NSAID (diclofenac, ibuprofen and naproxen) dissolved in either deionized water or effluent from a WWTP. Both processes were effective in degrading the NSAID mixture and the trend of degradation was as follows, diclofenac > naproxen > ibuprofen.
View Article and Find Full Text PDFA commercial sulfamethoxazole + trimethoprim formulation has been degraded in 0.050 M NaSO at pH 3.0 by electrochemical oxidation with electrogenerated HO (EO-HO), electro-Fenton (EF), photoelectro-Fenton with a 6-W UVA lamp (PEF) and solar photoelectro-Fenton (SPEF).
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- A new automated method using solid phase extraction and liquid chromatography (SPE/LC-UV) was developed to detect three types of phthalic acid esters (PAEs) in drinking water from various commercial bottles.
- The study found dibutyl phthalate (DBP) to be the most prevalent PAE, with concentrations ranging from 20.5 to 82.8 μg/L, while the method exhibited excellent sensitivity and reproducibility.
- Variation in PAEs levels among different bottle brands suggests that the contamination may be influenced by the materials and production processes used for the PET bottles.
A 3.0 L solar flow plant with a Pt/air-diffusion (anode/cathode) cell, a solar photoreactor and a photocatalytic photoreactor filled with TiO2-coated glass spheres has been utilized to couple solar photoelectro-Fenton (SPEF) and solar heterogeneous photocatalysis (SPC) for treating a 165mgL(-1) salicylic acid solution of pH 3.0.
View Article and Find Full Text PDFHere, the synergetic effect of coupling solar photoelectro-Fenton (SPEF) and solar heterogeneous photocatalysis (SPC) on the mineralization of 200mL of a 20mg L(-1) atrazine solution, prepared from the commercial herbicide Gesaprim, at pH 3.0 was studied. Uniform, homogeneous and adherent anatase-TiO2 films onto glass spheres of 5mm diameter were prepared by the sol-gel dip-coating method and used as catalyst for SPC.
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