石墨烯量子点产生消毒副产物:石墨烯纳米结构与水化学。

Min Zhang, Shasha Zhao, Bingqing Yu, Xuhua Cheng, Manhong Miao, Fang Wang, Yao Li
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引用次数: 0

摘要

石墨烯量子点(GQD)作为最小的石墨烯纳米材料(GNMs)之一,因其优异的荧光特性、亲水性和良好的生物相容性而具有广泛应用的潜力。残留在水中的 GQD 进入消毒过程后会产生 DBPs,其产生机理和影响因素是否与其他 GNM 相似,尚未得到证实和深入研究。本研究对 GQD 加氯产生的 DBPs 的总量、影响和形成机理进行了研究,并与氧化石墨烯(GO)和石墨烯进行了比较。结果表明,在浓度为 500 mg/L 时,GQD 产生的三氯甲烷(TCM)总量为 1019.6 μg/L,明显高于 GO(99.2 μg/L)和石墨烯(7.0 μg/L)。在对物理化学特性进行表征和比较后发现,关键因素是 GQD 具有丰富的官能团和较强的亲水性。不同的水化学条件会影响 DBPs 的形成,如 Br- 会增加溴化 DBPs 的形成,高 pH 会导致 GQD 生成的 TCM 减少,这一点与其他 GNM 不同。不过,NaCl 的浓度可以忽略不计。此外,天然水中残留的 GQD 可参与 DBPs 的形成并增加 DBPs 的含量,这可能受到地表水化学成分多样性的影响。本研究强调了 GQD 对 DBPs 形成的独特影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Generation of disinfection byproducts by graphene quantum dot: Graphene nanostructures and water chemistry.

Graphene quantum dot (GQD), as one of the smallest graphene nanomaterials (GNMs), has the potential to be widely used due to its excellent fluorescence properties, hydrophilicity, and good biocompatibility. GQD remaining in water will generate DBPs when entering the disinfection process, and whether the generation mechanism and influencing factors are similar to those of other GNMs has not been proven and thoroughly investigated. In this study, the total amount, effect, and mechanism of DBPs formation from GQD chlorination were investigated and compared with graphene oxide (GO) and graphene. The results show that GQD produced a total trichloromethane (TCM) amount of 1019.6 μg/L, which is significantly higher than that produced by GO (99.2 μg/L) and graphene (7.0 μg/L) at a concentration of 500 mg/L. The key factors are abundant functional groups and strong hydrophilicity of GQD after the characterization and comparison of physicochemical properties. Different water chemistry conditions influence DBPs formation, such as Br- increased the formation of brominated DBPs, and high pH led to a decrease in TCM generated by GQD, which is different from other GNMs. However, NaCl concentration can be negligible. Moreover, residual GQD in natural water can participate in the DBPs formation and increase the content of DBPs, which may be influenced by the diversity of chemical composition in surface water. This study highlights the unique impact of GQD on DBPs formation.

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