The contamination and accumulation of microplastics(MPs)in mangrove ecosystems have become an increasing concern due to their potential ecological risks.This study investigated and analyzed the abundance of MPs in sed...The contamination and accumulation of microplastics(MPs)in mangrove ecosystems have become an increasing concern due to their potential ecological risks.This study investigated and analyzed the abundance of MPs in sediments,water,and benthos of mangrove areas(MA)and adjacent non-vegetated areas(NA)in Qinglan Bay.Results showed that the abundance of MPs in MA was significantly higher than in adjacent NA[sediment:(4.39±2.20)items/50 g dry weight(dw)vs.(4.10±2.71)items/50 g dw;water:(11.79±7.61)items/L vs.(10.61±5.93)items/L;benthos:(4.94±5.27)items/individual vs.(3.5±0.71)items/individual].The primary components identified in sediments and benthos were rayon and cellulose,while polyethylene(PE)and polypropylene(PP)dominated in water.Smaller MPs(<1000μm)accounted for 44%,43%,and 61%of the MPs in sediments,water,and benthos,respectively,indicating that smaller MPs are more likely to be ingested or captured by benthic organisms.Additionally,MPsenrichment was calculated in benthos[enrichment index(EI)=1.41],water(EI=1.11),and sediments(EI=1.09),confirming that the unique ecological environment of the MA leads to different distribution and accumulation characteristics of MPs compared to the NA.The ecological risk assessment revealed low MPs pollution levels in sediments and water,but higher risks were observed for polychaetes and bivalves.展开更多
Metal oxides derived from metal-organic framework(MOF) have attracted considerable attention due to its excellent performance and unique structure. Doping is considered as an effective method to improve gas-sensing pe...Metal oxides derived from metal-organic framework(MOF) have attracted considerable attention due to its excellent performance and unique structure. Doping is considered as an effective method to improve gas-sensing performance. However, nonmetal doped metal oxides derived from MOF as gas-sensing materials have not been reported. Within this work, N atoms were successfully doped into the lattice of ZnO nanoparticles using ZIF-8 as a self-sacrificial template through a thermal treatment process with the assistant of urea. The obtained N-ZnO exhibited competitive ethanol-sensing performance, in which the response value of N-ZnO-5 to 100 ppm ethanol reached 115 at 190 ℃ with a satisfactory selectivity. It was found that the N-doping in ZnO facilitated the formation of oxygen vacancy that promoted the generation of adsorbed oxygen species to achieve the enhanced gas-sensing performance. Besides, the larger specific surface area resulting from the size reduction during the urea-assisted pyrolysis process can also be responsible for the improving of the ethanol-sensing performance.展开更多
基金The Natural Science Foundation of China under contract Nos 41806130 and 42407149the National Science Foundation for Post-doctoral Scientists of China under contract No.2024M750629+2 种基金the Natural Science Foundation of Guangdong Province under contract No.2018A0303130063the Marine Ecological Survey and Evaluation in Guangdong Province under contract No.0877-23GZTP01F179the Project of the Marine Geological Survey Program of China Geological Survey under contract Nos DD20230460,DD20242792,DD20211394,and DD20190308.
文摘The contamination and accumulation of microplastics(MPs)in mangrove ecosystems have become an increasing concern due to their potential ecological risks.This study investigated and analyzed the abundance of MPs in sediments,water,and benthos of mangrove areas(MA)and adjacent non-vegetated areas(NA)in Qinglan Bay.Results showed that the abundance of MPs in MA was significantly higher than in adjacent NA[sediment:(4.39±2.20)items/50 g dry weight(dw)vs.(4.10±2.71)items/50 g dw;water:(11.79±7.61)items/L vs.(10.61±5.93)items/L;benthos:(4.94±5.27)items/individual vs.(3.5±0.71)items/individual].The primary components identified in sediments and benthos were rayon and cellulose,while polyethylene(PE)and polypropylene(PP)dominated in water.Smaller MPs(<1000μm)accounted for 44%,43%,and 61%of the MPs in sediments,water,and benthos,respectively,indicating that smaller MPs are more likely to be ingested or captured by benthic organisms.Additionally,MPsenrichment was calculated in benthos[enrichment index(EI)=1.41],water(EI=1.11),and sediments(EI=1.09),confirming that the unique ecological environment of the MA leads to different distribution and accumulation characteristics of MPs compared to the NA.The ecological risk assessment revealed low MPs pollution levels in sediments and water,but higher risks were observed for polychaetes and bivalves.
基金supported by the National Natural Science Foundation of China (Nos. 21806008, 21876008)Science and Technology General Project of Beijing Municipal Education Commission, China (No. KM202110016010)。
文摘Metal oxides derived from metal-organic framework(MOF) have attracted considerable attention due to its excellent performance and unique structure. Doping is considered as an effective method to improve gas-sensing performance. However, nonmetal doped metal oxides derived from MOF as gas-sensing materials have not been reported. Within this work, N atoms were successfully doped into the lattice of ZnO nanoparticles using ZIF-8 as a self-sacrificial template through a thermal treatment process with the assistant of urea. The obtained N-ZnO exhibited competitive ethanol-sensing performance, in which the response value of N-ZnO-5 to 100 ppm ethanol reached 115 at 190 ℃ with a satisfactory selectivity. It was found that the N-doping in ZnO facilitated the formation of oxygen vacancy that promoted the generation of adsorbed oxygen species to achieve the enhanced gas-sensing performance. Besides, the larger specific surface area resulting from the size reduction during the urea-assisted pyrolysis process can also be responsible for the improving of the ethanol-sensing performance.
