Biochar and hydrochar particles and/or dissolved organic matter (DOM) may participate in several decomposition and transport processes of organic pollutants, thus their effect on aqueous photolysis of metribuzin (MBZ), selected as a potential pesticide pollutant of water systems, has been studied. Chars have been characterized by several techniques in order to correlate physicochemical characteristics with observed photodegradation rates. Biochar presented a micro-mesoporous graphitic structure with high surface area, and lower amounts of oxygen functional groups while hydrochar presented coral like structure, low surface area, incomplete carbonization and higher amounts of oxygen functional groups. MBZ photolysis was enhanced in the presence of low concentration levels (50 mgL⁻¹) of char particles and DOM while an inhibitory effect was observed for higher concentrations (100–400 mgL⁻¹). DOM from hydrochar present a stronger optical filter effect than biochar DOM while the biochar matrix and DOM present the higher ability to generate hydroxyl radicals (^•OH) and singlet oxygen (¹O₂), respectively. The participation of different ROS in photodegradation pathways for each matrix was studied also by scavenging experiments. The overall effect on photodegradation rate was the result of counterplay between the decrease of direct photolysis due to the light attenuation and the occurrence of indirect photolysis reaction paths via the generated ROS depending on the role of char matrix and DOM to act as source or sink for the ROS. The results demonstrate the significant and dissimilar role of char matrices and dissolved organic matter on the photo degradation rate of organic pollutants in aquatic matrices.

生物炭和水炭颗粒和/或溶解的有机物（DOM）可能参与有机污染物的几种分解和运输过程，因此，研究了它们对被选为水系统潜在农药污染物的Metribuzin（MBZ）在水上光解的影响。 。炭已通过多种技术进行了表征，以使理化特性与观测到的光降解速率相关。生物炭呈现出具有高表面积，氧官能团数量较少的微介孔石墨结构，而水焦呈现出珊瑚状结构，低表面积，不完全碳化和较高数量的氧官能团的石墨结构。在低浓度水平（50 mgL ^-1）下，MBZ光解作用增强焦炭颗粒和DOM），而对较高浓度（100–400 mgL ^-1）则有抑制作用。来自水焦炭的DOM比生物炭DOM表现出更强的滤光效果，而生物炭基质和DOM具有更高的生成羟基自由基（^• OH）和单线态氧（¹ O _{2）的能力}）， 分别。还通过清除实验研究了每种基质在光降解途径中不同ROS的参与。对光降解速率的总体影响是由于光衰减导致的直接光解减少与通过生成的ROS发生间接光解反应路径之间发生反作用的结果，后者取决于炭基质和DOM充当碳源或吸收剂的作用ROS。结果表明，炭基质和溶解的有机物对水基质中有机污染物的光降解速率具有显着而不同的作用。