Dr. S.S. Bhatnagar University Institute of Chemical Engineering and Technology, Panjab University, Chandigarh 160014, India.
Department of Chemistry and Centre of Advanced Studies, Panjab University, Chandigarh 160014, India.
J Hazard Mater. 2021 Sep 5;417:125982. doi: 10.1016/j.jhazmat.2021.125982. Epub 2021 May 5.
This paper reports the synthesis, characterization and detailed adsorption studies of rGO-MoS heterostructure. The heterostructure was explored for the adsorption of ofloxacin from the aqueous phase. Detailed studies were conducted to study the effect of crucial parameters such as pH of drug solution, adsorbent dose, temperature and initial drug concentration on the adsorption capacity. Even with a low surface area of 17.17 m/g, the adsorbent exhibited maximum removal efficiency of 95% at a dose of 0.35 g/L and an initial drug concentration of 10 mg/L in 240 min. Thermodynamic study revealed the values for ∆H and ∆G to be - 101.15 and - 7.47 kJ/mol respectively, indicating that the process is spontaneous and exothermic in nature. The heterostructure adsorbent exhibited remarkable reusability and stability up to five cycles. The heterostructure combines excellent adsorption capabilities arising from the two-dimensional structures of rGO and MoS with the stronger and more specific interaction with the drug molecules which results in better performance towards the removal of the drug. The excellent performance of the heterostructure indicates that combining 2D materials can be a good strategy for producing highly efficient materials towards the adsorptive removal of pollutants.
本文报道了 rGO-MoS 杂化结构的合成、表征和详细吸附研究。该杂化结构被探索用于从水相中吸附氧氟沙星。详细研究了关键参数，如药物溶液的 pH 值、吸附剂剂量、温度和初始药物浓度对吸附容量的影响。尽管比表面积仅为 17.17 m/g，但在 240 分钟内，当剂量为 0.35 g/L，初始药物浓度为 10 mg/L 时，吸附剂表现出最大去除效率为 95%。热力学研究表明，焓变（∆H）和吉布斯自由能变（∆G）的值分别为-101.15 和-7.47 kJ/mol，表明该过程是自发的和放热的。杂化结构吸附剂在五个循环中表现出良好的可重复使用性和稳定性。杂化结构结合了 rGO 和 MoS 的二维结构所带来的优异吸附能力，以及与药物分子更强和更特异的相互作用，从而在去除药物方面表现出更好的性能。杂化结构的优异性能表明，结合二维材料是制备高效吸附去除污染物材料的一种很好的策略。
