The water matrix plays a complex and significant role in photocatalytic degradation by influencing several factors, including dissolved anions and cations, the presence of natural organic matter, dissolved oxygen, suspended particles, turbidity, pH, and temperature. Optimizing photocatalytic processes for practical water treatment applications necessitates understanding these relationships. The efficiency and efficacy of photocatalytic water treatment systems in degrading organic contaminants can be enhanced by carefully considering and manipulating the water matrix. Based on literature published between 2000 and 2024, this review aims to comprehend the effects of contaminants and water quality on the photocatalytic degradation of organic pollutants. Researchers have employed various water matrices and reaction conditions to understand the interactions and impacts of different water matrix pollutants on photodegradation. The literature analysis revealed that when chloride and sulfate ions interact with reactive oxygen species and photocatalysts, their effects are predominantly inhibitory, thereby reducing the photocatalytic activity of the catalysts. Conversely, nitrate ions can exhibit an inhibitory effect under certain conditions by scavenging hydroxyl radicals while promoting photodegradation in other scenarios by generating more reactive oxygen species. The degree of inhibition varies according to the concentration of these factors.

This study presents an efficient way to degrade methylene blue (MB) present in water via photodegradation using H₂O₂ as an oxidant in the presence of UV irradiation and without the use of a catalyst. The reaction variables, employed to evaluate the performance of the photodegradation process using the UV/H₂O₂ system, were the amount of H₂O₂ in the reacting solution and the initial concentration of methylene blue. The degradation of methylene blue in the presence of H₂O₂ was not observed during agitation in darkness. The degradation time decreased as the H₂O₂ concentration increased after the ideal concentration was reached. At this stage, as it began to scavenge the generated hydroxyl radicals, the rate of degradation became inversely proportional to the concentration of H₂O₂. An increase in the quantities of MB and H₂O₂ improved the degradation efficiency because the oxidation process was aided by using the appropriate amount of H₂O₂ and an ideal length of UV light exposure. The experimental data obtained were well-fitted to zero-order reaction kinetics based on the high values of the correlation coefficient. It is believed that the OH radicals (OH^●) generated during the breakdown of H₂O₂ and the generated O₂^●− species attack the MB molecules and produce MB radicals (MB^●). These MB radicals further experience oxidation and convert to intermediates and finally to CO₂ and H₂O. The UV/H₂O₂ system proved to be quite efficient for the photodegradation of methylene blue without the use of any solid catalyst. This UV/H₂O₂ system can be employed in the degradation of other organic pollutants in industrial wastewater.

This experiment investigated the degradation of amoxicillin in water using hydrogen peroxide (H₂O₂) and UV Irradiation. The parameters analyzed included the initial concentration of amoxicillin, the pH of the solution, and the quantity of H₂O₂ used. These factors were examined to assess the effectiveness of the photodegradation process. No degradation of amoxicillin was observed in the dark during stirring for 20 min. The investigation demonstrated successful photodegradation of amoxicillin using H₂O₂ as an oxidant in the presence of UV Irradiation. The pH of the irradiated solution significantly influenced the degradation of amoxicillin, with minimal degradation at acidic pH and a gradual increase as the pH shifted towards more basic conditions. Degradation was more pronounced with higher concentrations of H₂O₂, while it decreased as the concentration of amoxicillin in the reacting solution increased. Complete degradation was achieved using 3 mL of H₂O₂. The experimental data were well-fitted to zero-order reaction kinetics. The findings of this investigation show significant improvements compared to previously reported results in the field of photocatalysis using nanomaterials and photolysis techniques involving UV and H₂O₂. The novelty of our research is in the different experimental parameters used for the UV/H₂O₂ photolysis process, which distinguishes it from other previous investigations. The UV/H₂O₂ system proved highly effective in the photodegradation of amoxicillin, making it a viable option for degrading other organic pollutants commonly found in industrial wastewater.

This research investigated the corrosion resistance of surface layers on low-carbon steel exposed to a chloride environment at room temperature. This study systematically evaluated the effects of varying pack compositions, coating temperatures, and application durations on the characteristics of the deposited coatings. The potentiodynamic polarization corrosion test was employed to assess the wet corrosion behavior of the specimens. Elemental compositions and microstructural features were analyzed using energy-dispersive X-ray spectroscopy (EDX) in conjunction with scanning electron microscopy (SEM), providing insights into phase distribution. The chromizing, titanizing, and chromotitanizing treatments were conducted at temperatures of 900 °C, 1000 °C, and 1100 °C, respectively, with varying coating times. X-ray diffraction analysis revealed a complex arrangement of elements and compounds within the coatings, including Cr, Ti, Cr_1.9Ti, FeTi, Al₂O₃, Cr₂O₃, TiO₂, Cr_1.36Fe_0.52, and (Ti_0.86)_3.58. The study found that as the deposition duration increased, the coating thickness increased, comprising a thin inner layer and a substantially thicker outer layer. This layered structure resulted from the outward diffusion of Fe atoms and the inward diffusion of Cr and Ti atoms. Electrochemical analysis in a 3.5% NaCl aqueous solution indicated a marked enhancement in the corrosion resistance of the coated specimens compared to their uncoated counterparts. The potentiodynamic polarization tests confirmed that the protective coatings significantly reduced the corrosion rate, with performance influenced by both the temperature and duration of the deposition process. These findings highlighted the potential of tailored coating techniques to improve the durability and performance of low-carbon steel in corrosive environments.