Enhanced adsorption of target branched compounds including antibiotic norfloxacin frameworks on mild steel surface for efficient protection: An experimental and molecular modelling study  

作　　者：Lingli Chen Yueting Shi Sijun Xu Junle Xiong Fang Gao Shengtao Zhang Hongru Li 

机构地区：[1]College of Chemistry and Chemical Engineering,Chongqing University,Chongqing 400044,China [2]Chongqing Kunding Environmental Protection Technology,Co.,Ltd,Chongqing 400044,China

出　　处：《Chinese Journal of Chemical Engineering》2023年第8期212-227,共16页中国化学工程学报（英文版）

基　　金：the National Natural Science Foundation of China (21376282, 21676035, 21878029);Chongqing Science and Technology Commission (2022NSCQ-MSX1298);China Postdoctoral Science Foundation (22012T50762 & 2011M501388);Graduate Student Research Innovation Project, Chongqing University (CYB18046)。

摘　　要：In this study, an approach was proposed to employ new target branched compounds(TBCs) including multiple antibiotic norfloxacin frameworks for intensified adsorption films to achieve super protection of mild steel in HCl medium. Thus, the TBCs containing bis/tri norfloxacin skeletons were synthesized by multi-step preparation route. In addition, the reference linear compound(RLC) including a single norfloxacin part was also synthesized. The chemical structures of these compounds were confirmed by various means. It was demonstrated that the TBCs could form the tough adsorption films on the surface of mild steel, which could be processed mainly through chemisorption effect. The electrochemical analysis suggested that the TBCs displayed superior corrosion inhibition performance for low carbon steel in1.0 mol·L^(-1) HCl solution over the RLC(RLC, 87.80%;TBC1, 97.63%;TBC2, 98.35%), which was further understood by the molecular modelling. The isotherm adsorption plots were employed to analyze the spontaneous adsorption process of the TBCs on low carbon steel surface, and a prominent chemisorption could be inferred by the standard Gibbs free energy changes of the adsorption.

关 键 词：Branched compounds Norfloxacin part ADSORPTION ANTICORROSION Mild steel 

分 类 号：O647.3[理学—物理化学]