ABSTRACT

Significant health risks are caused by trace levels of haloacetic acids (HAAs) in drinking water. We used graphene oxide (GO), a high-performance absorbent, to remove monochloroacetic acid (MCAA), dichloroacetic acid (DCAA) and trichloroacetic acid (TCAA). 31.6%, 27.1% and 30.2% of MCAA, DCAA and TCAA in drinking water could be rapidly removed within 2 min by the interaction of intermolecular hydrogen bonds between GO and HAAs. On the other hand, as a type of weak interaction, intermolecular hydrogen bonds are easy to fracture, which leads to the recovery of GO. The removal efficiency of MCAA, DCAA and TCAA monotonously decreased with increasing pH from 3 to 11. Temperature was not an important influence on the removal efficiency of HAAs, and only affected the interaction of intermolecular hydrogen bonds between GO and HAAs. A continuous adsorption process was used for further improving the removal efficiency of HAAs, and the concentration of total HAAs decreased from 436 to 52.5 μg L⁻¹ after five adsorption processes. The total contact time was just 2.25 min, which was faster than other reported adsorbents, and total HAAs could be decreased by 88%. The innovative process in this study provides an effective method for application of GO to rapidly remove HAAs in drinking water.

摘要

饮用水中的微量卤代乙酸 (HAA) 会导致严重的健康风险。我们使用高性能吸收剂氧化石墨烯 (GO) 去除一氯乙酸 (MCAA)、二氯乙酸 (DCAA) 和三氯乙酸 (TCAA)。通过GO和HAA分子间氢键的相互作用，饮用水中31.6%、27.1%和30.2%的MCAA、DCAA和TCAA可在2 min内快速去除。另一方面，作为一种弱相互作用，分子间氢键容易断裂，从而导致GO的恢复。MCAA、DCAA和TCAA的去除效率随着pH从3增加到11而单调下降。温度对HAAs的去除效率没有重要影响，只影响GO和HAAs之间的分子间氢键的相互作用。^-1在五次吸附过程后。总接触时间仅为 2.25 分钟，比其他报道的吸附剂更快，总 HAA 可降低 88%。本研究的创新工艺为应用 GO 快速去除饮用水中的 HAA 提供了一种有效方法。