Department of Energy Science and Technology, Environmental Waste Recycle Institute, Myongji University, Yongin, Gyeonggi-do, 17058, Republic of Korea.
Department of Energy Science and Technology, Environmental Waste Recycle Institute, Myongji University, Yongin, Gyeonggi-do, 17058, Republic of Korea.
Chemosphere. 2021 Sep;279:130463. doi: 10.1016/j.chemosphere.2021.130463. Epub 2021 Apr 12.
The removal of methyl blue (MB) from wastewater using graphene and its derivative is very successful due to their high aromaticity which drives adsorption via π-π and electron-donor-acceptor (EDA) interactions; however, graphene is expensive and difficult to synthesize, which limit its practical application. Meanwhile, low aromatic carbon materials (LACM) derived from farm-water and other materials are cheaper and easier to synthesize but have limited π-π and EDA interactions and low adsorption capacity. Herein, we demonstrate that LACM with oxidized-nitrogen (N-O) functionality overcomes this limitation via chemisorption of MB through a combination of hydrophobic-hydrophobic interactions and EDA interactions. This is confirmed using XPS analysis of LACM/N-O post MB adsorption. Consequently, a remarkable adsorption capacity of 3904 mg g is achieved under batch condition which is the highest ever reported for any MB adsorbent. Furthermore, LACM/N-O works equally well under continuous-flow adsorption conditions which shows its practicability. Amongst several LACM precursors tested, only Azo-dyes are able to generate LACM/N-O implying that the NN moiety is key to N-O formation. A carbonization temperature of 700 °C generates the highest N-O sites hence the highest adsorption capacity. Characterization of LACM/N-O is done mainly using BET, XPS, Raman, TGA, and FTIR analysis.
使用石墨烯及其衍生物从废水中去除亚甲基蓝（MB）非常成功，因为它们的高芳香性通过π-π 和电子供体-受体（EDA）相互作用驱动吸附；然而，石墨烯昂贵且难以合成，这限制了其实际应用。同时，源自农田水和其他材料的低芳香碳材料（LACM）更便宜且易于合成，但π-π 和 EDA 相互作用有限，吸附能力低。在此，我们证明具有氧化氮（N-O）官能团的 LACM 通过通过疏水-疏水相互作用和 EDA 相互作用组合对 MB 的化学吸附克服了这一限制。这通过 MB 吸附后 LACM/N-O 的 XPS 分析得到证实。因此，在批量条件下实现了 3904 mg/g 的显著吸附容量，这是迄今为止任何 MB 吸附剂的最高值。此外，LACM/N-O 在连续流动吸附条件下同样有效，表明其实用性。在所测试的几种 LACM 前体中，只有偶氮染料能够生成 LACM/N-O，这表明 NN 部分是 N-O 形成的关键。700°C 的碳化温度会产生最高的 N-O 位，从而产生最高的吸附容量。LACM/N-O 的表征主要使用 BET、XPS、拉曼、TGA 和 FTIR 分析进行。
