A feasible method to improve the protection ability of metal by functionalized carbon dots as environment-friendly corrosion inhibitor

被引:146
作者
Ye, Yuwei [1 ]
Zhang, Dawei [3 ]
Zou, Yangjun [1 ]
Zhao, Haichao [1 ,2 ]
Chen, Hao [1 ]
机构
[1] Jiangxi Univ Sci & Technol, Fac Mat Met & Chem, Ganzhou 341000, Peoples R China
[2] Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Ningbo 315201, Peoples R China
[3] Univ Sci & Technol Beijing, Corros & Protect Ctr, Beijing 100083, Peoples R China
关键词
N-doped carbon dots; Electrochemistry; Adsorption; Molecular dynamics simulation; MILD-STEEL CORROSION; HCL SOLUTION; ANTICORROSIVE MECHANISM; IONIC LIQUIDS; GREEN; EXTRACT; DERIVATIVES; GRAPHENE; NITROGEN; OXIDE;
D O I
10.1016/j.jclepro.2020.121682
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
A green inhibitor of N-doped carbon dots (N-CDs) was obtained from the reaction between citric acid and L-histidine. Then, a series of professional equipment was selected to evaluate their structure and corrosion protective behaviors in HCl solution. Quantum chemistry and molecular dynamics were chosen to discuss the inhibition mechanism of N-CDs. Electrochemical results showed that the N-CDs exhibited super corrosion protection to metal because it could form dense and ordered adsorption film on metal surface. Compared with citric acid and L-histidine inhibitors, the inhibition efficiency of N-CDs was more than 90% at 100 mg L-1. Based on the calculation of quantum chemistry and molecular dynamics, the low energy gap (Delta E = 0.0680 eV) and high binding energy (E-binding = 190.85 kJ.mol(-1)) of N-CDs indicated the strong chemisorption on metal substrate, which fully explained the inhibition mechanism of N-CDs at molecular/atomic level. (C) 2020 Elsevier Ltd. All rights reserved.
引用
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页数:12
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