Department of Environmental Engineering, Federal University of Espirito Santo, Vitoria, ES, Brazil.
Department of Physics, Federal University of Espirito Santo, Vitoria, ES, Brazil.
J Environ Sci Health B. 2020;55(4):361-375. doi: 10.1080/03601234.2019.1705113. Epub 2019 Dec 27.
Activated carbons are well-known porous materials as an effective adsorbent used for the removal of emerging contaminants, such as herbicides, which are increasingly present in water bodies. Most water treatment plants, specially in Brazil, are unable to completely remove such contaminants by the conventional process and advanced treatment using activated carbons is required. The aim of this paper was to verify the influence of the activated carbons granulometry and specific surface area on the 2,4-dichlorophenoxyacetic acid (2,4-D) herbicide removal efficiency using distilled-deionized water and filtered water collected from a conventional Water Treatment Plant. Commercial activated carbons samples used in this work were obtained from two different manufacturers. Activated carbons were analyzed by the specific surface area, pore size and volume distribution, nuclear magnetic resonance, infrared and x-ray spectroscopy, moisture, volatile matter and ash contents. Batch adsorption isotherms experiments were used and performed by Langmuir and Freundlich models. Granular and powdered activated carbons removed over 99% of 2,4-D in distilled water and near to 99% using filtered water. The activated carbons evaluated in this work presented high performance and played a key role in water treatment by removing 2,4-D herbicide, ensuring the protection of human health and the ecosystem.
活性炭是一种众所周知的多孔材料，作为一种有效的吸附剂，用于去除新兴污染物，如除草剂，这些污染物越来越多地存在于水体中。大多数水处理厂，特别是在巴西，无法通过常规工艺完全去除这些污染物，因此需要使用活性炭进行高级处理。本文的目的是验证活性炭粒度和比表面积对使用蒸馏水和从常规水处理厂收集的过滤水去除 2,4-二氯苯氧乙酸（2,4-D）除草剂效率的影响。本工作中使用的商业活性炭样品来自两个不同的制造商。通过比表面积、孔径和体积分布、核磁共振、红外和 X 射线光谱、水分、挥发分和灰分对活性炭进行了分析。采用 Langmuir 和 Freundlich 模型进行了批量吸附等温线实验。颗粒状和粉末状活性炭在蒸馏水中去除了超过 99%的 2,4-D，而使用过滤水去除了近 99%的 2,4-D。在这项工作中评估的活性炭表现出高性能，在通过去除 2,4-D 除草剂来处理水方面发挥了关键作用，确保了人类健康和生态系统的保护。
