Department of Chemistry and Green-Nano Materials Research Center, Kyungpook National University, Daegu 41566, Republic of Korea.
Department of Chemistry and Green-Nano Materials Research Center, Kyungpook National University, Daegu 41566, Republic of Korea.
J Hazard Mater. 2020 Sep 5;396:122624. doi: 10.1016/j.jhazmat.2020.122624. Epub 2020 Apr 6.
The contamination of water resources by hazardous organic compounds is becoming severe worldwide. In this study, the adsorptive removal of atrazine (ATZ) and diuron (DUR), two widely used herbicides, from water by polyaniline-derived carbons (PDCs) was investigated for the first time, under various conditions. A selected PDC, fabricated at optimum conditions, i.e., by pyrolysis at 800 °C (and labeled PDC(800)), showed remarkable adsorptivity for both herbicides, that is, 7.7 and 11.3 times the maximum adsorption capacity (Q) for ATZ and DUR, respectively, compared to activated carbon (AC). Or, the Q values of PDC(800) for ATZ and DUR were 943 and 884 mg/g, respectively; however, the Q values of AC were only 123 and 78.0 mg/g, respectively. Moreover, the optimum adsorbent PDC(800) had 4.5 and 3.1 times Q that of the best adsorbent, that showed the highest performances, so far, for ATZ and DUR, respectively. Plausible adsorption mechanisms were suggested based on the porosity and the adsorption in a wide pH range. The new adsorbent was reusable via simple solvent washing. Based on its remarkable adsorption performance and facile reusability, PDC(800) can be considered a promising adsorbent to remove herbicides such as ATZ and DUR from contaminated water.
水资源受到有害有机化合物的污染在全球范围内日益严重。本研究首次探讨了聚苯胺衍生碳（PDC）在不同条件下对水中莠去津（ATZ）和敌草隆（DUR）这两种广泛使用的除草剂的吸附去除效果。在最佳条件下制备的一种选定的 PDC（在 800°C 下热解，标记为 PDC(800)）对两种除草剂均表现出显著的吸附能力，与活性炭（AC）相比，其对 ATZ 和 DUR 的最大吸附容量（Q）分别提高了 7.7 和 11.3 倍。或者，PDC(800)对 ATZ 和 DUR 的 Q 值分别为 943 和 884 mg/g，而 AC 的 Q 值仅分别为 123 和 78.0 mg/g。此外，最佳吸附剂 PDC(800)的 Q 值分别是迄今为止报道的 ATZ 和 DUR 的最佳吸附剂的 4.5 和 3.1 倍。基于多孔性和在宽 pH 范围内的吸附作用，提出了合理的吸附机制。通过简单的溶剂洗涤，新的吸附剂可重复使用。PDC(800)具有显著的吸附性能和易于重复使用的特点，可考虑将其作为一种有前途的吸附剂，用于去除受污染水中的 ATZ 和 DUR 等除草剂。
