Interaction of graphene oxide with co-existing arsenite and arsenate: Adsorption, transformation and combined toxicity.,Environment International

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Interaction of graphene oxide with co-existing arsenite and arsenate: Adsorption, transformation and combined toxicity.
Environment International ( IF 10.3 ) Pub Date : 2019-07-06 , DOI: 10.1016/j.envint.2019.104992
Xuesong Cao ₁ , Chuanxin Ma ₂ , Jian Zhao ₃ , Craig Musante ₂ , Jason C White ₂ , Zhenyu Wang ₄ , Baoshan Xing ₅

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The outstanding commercial application potential of graphene oxide (GO) will inevitably lead to its increasing release into the environment, and then affect the environmental behavior and toxicity of conventional pollutants. Interactions between arsenite [As (III)]/arsenate [As (V)] with GO and their combined toxicity to Chlorella pyrenoidosa were investigated. Under abiotic conditions, approximately 42% of the adsorbed As (III) was oxidized by GO with simulated sunlight illumination, which was induced by electron-hole pairs on the surface of GO. Co-exposure with GO greatly enhanced the toxicity of As (III, V) to alga. When adding 10 mg/L GO, the 72 h median effect concentration of As (III) and As (V) to C. pyrendoidosa decreased to 12.7 and 9.4 mg/L from 30.1 and 16.3 mg/L in the As alone treatment, respectively. One possible mechanism by which GO enhanced As toxicity could be that GO decreased the phosphate concentration in the algal medium, and then increased the accumulation of As (V) in algae. In addition, transmission electron microscope (TEM) images demonstrated that GO acted as a carrier for As (III) and As (V) transport into the algal cells. Also, GO induced severe oxidative stress, which could have subsequently compromised important detoxification pathways (e.g., As complexation with glutathione, As methylation, and intracellular As efflux) in the algal cells. Our findings highlight the significant impact of GO on the fate and toxicity of As in the aquatic environment.

中文翻译：

氧化石墨烯与共存的亚砷酸盐和砷酸盐的相互作用：吸附，转化和综合毒性。

氧化石墨烯（GO）的巨大商业应用潜力将不可避免地导致其向环境中的释放增加，进而影响常规污染物的环境行为和毒性。研究了亚砷酸盐[As（III）] /砷酸盐[As（V）]与GO的相互作用及其对吡喃小球藻的综合毒性。在非生物条件下，模拟的阳光照射下，GO氧化了约42％吸附的As（III），这是由GO表面上的电子-空穴对诱导的。与GO的共同暴露大大增强了As（III，V）对藻类的毒性。当添加10 mg / L GO时，对吡喃假单胞菌的72 h砷（III）和砷（V）的中值作用浓度分别从单独As处理中的30.1和16.3 mg / L降至12.7和9.4 mg / L。。GO增强As毒性的一种可能机制可能是GO降低了藻类培养基中磷酸盐的浓度，然后增加了藻类中As（V）的积累。此外，透射电子显微镜（TEM）图像证明GO充当了As（III）和As（V）运入藻类细胞的载体。此外，GO诱导了严重的氧化应激，这可能随后损害了藻类细胞中的重要排毒途径（例如，与谷胱甘肽的As络合，As甲基化和细胞内As外排）。我们的发现强调了GO对水生环境中As的命运和毒性的重大影响。透射电子显微镜（TEM）图像证明GO充当了As（III）和As（V）运入藻类细胞的载体。此外，GO诱导了严重的氧化应激，这可能随后损害了藻类细胞中的重要排毒途径（例如，与谷胱甘肽的As络合，As甲基化和细胞内As外排）。我们的发现强调了GO对水生环境中As的命运和毒性的重大影响。透射电子显微镜（TEM）图像证明GO充当了As（III）和As（V）运入藻类细胞的载体。此外，GO诱导了严重的氧化应激，这可能随后损害了藻类细胞中的重要排毒途径（例如，与谷胱甘肽的As络合，As甲基化和细胞内As外排）。我们的发现强调了GO对水生环境中As的命运和毒性的重大影响。

更新日期：2019-07-07

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