Wang Chuanjie, Shi Wenbin, Zhu Kaili, Luan Xinxin, Yang Ping
School of Material Science and Engineering, University of Jinan, Jinan 250022, PR China.
Langmuir. 2022 May 10;38(18):5934-5942. doi: 10.1021/acs.langmuir.2c00731. Epub 2022 Apr 27.
MoS was vertically grown on g-CN nanosheets by chemical vapor deposition to prepare nanocomposites named MS-CN samples. Because of a large-surface area of 545.2 m·g and a total pore volume of 1.7 cm·g, the sample MS-CN revealed fast and large adsorption capacity for tetracycline hydrochloride (TCH). The adsorption kinetics model proved that TCH could be rapidly adsorbed within 5 min, and chemical adsorption was dominant. For single-component adsorption of TCH, the maximum adsorption capacity was ∼154 mg/g. The monolayer adsorption was carried out on the surface of MS-CN. Both of the film and intra-particle diffusion were considered as significant processes to facilitate adsorption. Thermodynamic parameters indicate that the adsorption of TCH is a spontaneous endothermic process. The adsorption of TCH was highly pH-dependent. The maximum adsorption capacity of TCH was obtained in the case of pH ∼ 7. After four adsorption and desorption cycles, MS-CN still maintained well-adsorption performance. Multiple adsorption mechanism, pore filling, electrostatic force, π-π conjugation, and hydrogen bonding interactions were studied. Because of fast adsorption, large adsorption capacity, and high stability, it is a promising adsorbent for antibiotics.
通过化学气相沉积法在g-CN纳米片上垂直生长MoS，制备了名为MS-CN样品的纳米复合材料。由于具有545.2 m²/g的大表面积和1.7 cm³/g的总孔体积，MS-CN样品对盐酸四环素（TCH）显示出快速且大的吸附容量。吸附动力学模型证明TCH可在5分钟内快速吸附，且化学吸附占主导。对于TCH的单组分吸附，最大吸附容量约为154 mg/g。单层吸附在MS-CN表面进行。膜扩散和颗粒内扩散均被认为是促进吸附的重要过程。热力学参数表明TCH的吸附是一个自发的吸热过程。TCH的吸附高度依赖于pH值。在pH约为7的情况下获得了TCH的最大吸附容量。经过四个吸附和解吸循环后，MS-CN仍保持良好的吸附性能。研究了多种吸附机制、孔隙填充、静电力、π-π共轭和氢键相互作用。由于吸附速度快、吸附容量大且稳定性高，它是一种有前途的抗生素吸附剂。
