Soils play a significant role in the global carbon cycle, acting as both sinks and sources of terrestrial carbon. They exert substantial influence on climate change by regulating the atmospheric concentrations of gree...Soils play a significant role in the global carbon cycle, acting as both sinks and sources of terrestrial carbon. They exert substantial influence on climate change by regulating the atmospheric concentrations of greenhouse gases, including carbon dioxide, through processes of carbon fixation and release (Lehmann et al., 2020). Soil organic carbon represents a key carbon reservoir within terrestrial ecosystems.Therefore, enhancing soil organic carbon levels is a crucial strategy for augmenting terrestrial carbon sinks and mitigating global climate change.展开更多
To advance the knowledge of the environmental fate of sulfamethoxazole （SMX）, we systematically investigated the effects of natural water constituents and synthetic substances （i.e., TiO2 nanoparticles （nTiO2） an...To advance the knowledge of the environmental fate of sulfamethoxazole （SMX）, we systematically investigated the effects of natural water constituents and synthetic substances （i.e., TiO2 nanoparticles （nTiO2） and Ti-doped ^-Bi203 （NTB）） on the photodegradation kinetics of SMX under xenon lamp irradiation. The photolysis of SMX in aqueous solution followed first-order kinetics. Our results showed that higher concentrations of SMX, fulvic acid, suspended sediments, NTB and higher pH value decreased the photodegradation rates of SMX, whereas H202 improved the SMX photodegradation. TiO2 nanoparticles had a dual effect on pbotodegradation due to their photocatalytic activity and photoabsorption of photons. No intermediates more toxic toward Vibrio fischeri than SMX were produced after direct photolysis and photocatalytic degradation for 3 hr. The photolysis of SMX involved three pathways： hydroxylation, cleavage of the sulfonamide bond, and fragmentation of the isoxazole ring. This study lays the groundwork for a better understanding of the environmental fate of SMX.展开更多
基金financially supported by the National Natural Science Foundation of China (Grant Nos. 42377287, 42177275 & 41972046)the National Key R&D Program of China (Grant No. 2021YFD1901200)the Hundred Talents Program of the Chinese Academy of Sciences, and the Jiangxi “Double Thousand Plan” (Grant No. jxsq2023102218)
文摘Soils play a significant role in the global carbon cycle, acting as both sinks and sources of terrestrial carbon. They exert substantial influence on climate change by regulating the atmospheric concentrations of greenhouse gases, including carbon dioxide, through processes of carbon fixation and release (Lehmann et al., 2020). Soil organic carbon represents a key carbon reservoir within terrestrial ecosystems.Therefore, enhancing soil organic carbon levels is a crucial strategy for augmenting terrestrial carbon sinks and mitigating global climate change.
基金supported by the National Basic Research Program (973) of China (No. 2010CB429003)the National Natural Science Foundation of China (No.21077010)the Fok Ying-Tong Education Foundation,China (No. 121077)
文摘To advance the knowledge of the environmental fate of sulfamethoxazole （SMX）, we systematically investigated the effects of natural water constituents and synthetic substances （i.e., TiO2 nanoparticles （nTiO2） and Ti-doped ^-Bi203 （NTB）） on the photodegradation kinetics of SMX under xenon lamp irradiation. The photolysis of SMX in aqueous solution followed first-order kinetics. Our results showed that higher concentrations of SMX, fulvic acid, suspended sediments, NTB and higher pH value decreased the photodegradation rates of SMX, whereas H202 improved the SMX photodegradation. TiO2 nanoparticles had a dual effect on pbotodegradation due to their photocatalytic activity and photoabsorption of photons. No intermediates more toxic toward Vibrio fischeri than SMX were produced after direct photolysis and photocatalytic degradation for 3 hr. The photolysis of SMX involved three pathways： hydroxylation, cleavage of the sulfonamide bond, and fragmentation of the isoxazole ring. This study lays the groundwork for a better understanding of the environmental fate of SMX.
