Environmental Science-Nano
·
2022
·Vol. 9
·期 9
·3525-3537
·
IF 9.473
Manman Cao,Fei Wang,Beihai Zhou,Huilun Chen,Rongfang Yuan,Shuai Ma,Huanhuan Geng,Baoshan Xing
Silver nanoparticles (AgNPs) have little impact on organisms at environmentally relevant concentrations. However, AgNPs coexisting with photoactive minerals may show an elevated combined ecotoxicity due to the additional photoinduced cytotoxicity caused by the Ag loading, which increases the photocatalytic activity. Herein, key pathway perturbations in the algae Chlorella pyrenoidosa (C. pyrenoidosa) under exposure to AgNPs, hematite nanoparticles (HemNPs), and their mixtures (direct exposure (MX1) and exposure after interaction (MX2)) were explored under illumination using transcriptomic and metabolomic approaches. The results showed that the MX2 group exhibited the strongest C. pyrenoidosa growth inhibition. The AgNPs, HemNPs, MX1 and MX2 groups significantly triggered ROS production in algal cells, which increased by 11.05%, 5.54%, 4.79% and 13.58%, respectively. Notably, the cell membrane was obviously damaged only in the MX2 group. Transcriptomic and metabolomic analyses showed that metabolic pathways, such as starch and sucrose metabolism, pantothenate and CoA biosynthesis, and amino acid metabolism, were significantly altered. To examine the internal mechanisms behind these differences in genes and metabolites, ultraviolet–visible (UV–vis) diffuse reflectance spectroscopy, electrochemical impedance spectroscopy (EIS) and photocurrent response measurements were used to determine the photochemical properties of the four systems. AgNPs attachment enhanced the photoelectric properties of the AgNPs/HemNPs composite (MX2), improving the photoinduced electron–hole pair separation efficiency and charge separation efficiency. Electron paramagnetic resonance (EPR) results also showed that the MX2 system yielded the highest amount of free radicals. Free radicals caused photoinduced cytotoxicity in algae, leading to aggravated toxicity of AgNPs to C. pyrenoidosa in the presence of HemNPs.
研究领域:
环境科学
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毒理学
·
微生物学
·
生物化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xingyue Wei,Hanmin Zhang,Mengbo Cao
In this study, a series of Co-doped NPC biochar (nCo-NPC) was prepared by one-step pyrolysis of N and P-rich Chlorella pyrenoidosa (CP) waste mixed with cobalt nitrate for heterogeneous catalytic ozonation (HCO) degradation of ibuprofen (IBU). Compared to the HCO process using CoOx or NPC catalysts, the 2Co-NPC catalyst showed superior performance in the degradation of IBU due to the synergistic effect between the CoOx and NPC. The 2Co-NPC catalyst exhibited high stability after five trials, with the removal efficiency decreasing from 99.9 % to 85.4 %. Moreover, hydroxyl radicals ( OH) and adsorbed atomic oxygen (*O) were identified as the main active species in 2Co-NPC HCO process. The coupling of NPC and CoOx formed electron-rich Co(II) center and electron-deficient NPC center. The electron-rich Co(II) center can direct decomposition of adsorbed ozone into *O and further convert to OH. The electron-deficient NPC center gained electrons from organic pollutants, C N, C O, and P groups through C O Co and C N Co bonds, stimulating the π-cation reaction to transfer to the Co(II) center, thus accelerating the cycling between Co(II) and Co(III). Additionally, the deprotonation of surface hydroxyl groups may also serve as a potential active site for the decomposition of ozone into OH. This study used biomass CP as a precursor coupled with cobalt salt, revealing electron transfer pathways and providing new insights for the future developing of low-cost, efficient, and stable ozone catalysts.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2023
·
IF 13.6
Hongping Liao,Dandan Gao,Chunmiao Kong,Muhammad Junaid,Ye Li,Xikun Chen,Qingzhi Zheng,Guanglong Chen,Jun Wang
Nanoplastics and di(2-ethylhexyl) phthalate (DEHP) are ubiquitous emerging contaminants that are transferred among organisms through food chain in the ecosystem. This study evaluated the trophic transfer of polystyrene nanoplastics (PSNPs) and DEHP in a food chain including Chlorella pyrenoidosa , Daphnia magna and Micropterus salmoides (algae-crustacean-fish) and lipid metabolism at a higher trophic level in fish. Our results showed that the PSNPs and DEHP accumulated in C. pyrenoidosa or D. magna were transferred to the M. salmoides , of which the DEHP were not biomagnified, while the PSNPs were trophically amplified by the food chain. It is suggested that more PSNPs might be accumulated by higher level consumers in a longer food chain. Additionally, the trophic transfer of PSNPs and DEHP resulted in antioxidant response and histopathological damage in M. salmoides . Moreover, the lipid biochemical parameters and lipid metabolism related genes ( fasn , hsl , cpt1a , atgl , apob , fabp1 , lpl , cetp ) of M. salmoides were significantly affected, which indicated disturbance of lipid metabolism. This study offers great insight into the transfer of contaminants by trophic transfer and their negative effects on organisms at higher trophic levels, which cause human exposure to MNPs and organic contaminants in the ecosystem.
研究领域:
环境科学
·
生态毒理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）