Liao Cong, Liu Yi-Ping, Ren Hao, Jiang Xin-Yu, Yu Jin-Gang, Chen Xiao-Qing
College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan 410083, China.
College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan 410083, China.
J Hazard Mater. 2021 Oct 5;419:126484. doi: 10.1016/j.jhazmat.2021.126484. Epub 2021 Jun 25.
An aromatic heterocyclic compound, 2-aminobenzothiazole (ABT), was used to decorate graphene oxide (GO) by a facile hydrothermal self-assembly procedure. The developed three-dimensional (3D) GO-ABT composite aerogels could be utilized as high-powered and sustainable adsorbents for the enrichment and recovery of low concentration rare earth elements (REEs) from aqueous solutions. The composition and microstructure of GO-ABT composites were explored various characterization methods. The enrichment properties of GO-ABT composites for REEs were investigated in detail, revealing the existence of S-, N- and -NH in ABT, as well as the carboxyl and hydroxyl groups of GO which might act as the major REE binding sites. The adsorption of GO-ABT composites for low concentration REEs could reach equilibrium in 30 min. Our investigations confirmed that the optimal pH value of GO-ABT composites for REEs was pH 4.0-5.0. For the adsorbent regeneration study, 50.0 mg of GO-ABT composite was used toward 20.0 mL of Er solutions. After ten regeneration cycles, the adsorption rates of GO-ABT composites for Er remained around 100%, and the desorption rates maintained over 90%. The long-term storage of the adsorbent did not affect its adsorption ability, while desorption rates increased, indicating it possessed relatively higher stability.
一种芳香族杂环化合物2-氨基苯并噻唑（ABT），通过简便的水热自组装程序用于修饰氧化石墨烯（GO）。所制备的三维（3D）GO-ABT复合气凝胶可作为高效且可持续的吸附剂，用于从水溶液中富集和回收低浓度稀土元素（REEs）。通过各种表征方法探究了GO-ABT复合材料的组成和微观结构。详细研究了GO-ABT复合材料对REEs的富集性能，揭示了ABT中S-、N-和-NH的存在，以及GO的羧基和羟基可能作为主要的REE结合位点。GO-ABT复合材料对低浓度REEs的吸附在30分钟内可达到平衡。我们的研究证实，GO-ABT复合材料对REEs的最佳pH值为4.0 - 5.0。对于吸附剂再生研究，使用50.0 mg的GO-ABT复合材料处理20.0 mL的铒溶液。经过十次再生循环后，GO-ABT复合材料对铒的吸附率保持在100%左右，解吸率保持在90%以上。吸附剂的长期储存不影响其吸附能力，而解吸率有所增加，表明其具有相对较高 的稳定性。
