李雪琪,何闯,于坷坷,罗启灵,龙武剑.含席夫碱结构碳点缓蚀剂的简易可扩展制备及性能研究[J].表面技术,2023,52(10):229-240, 258.
LI Xue-qi,HE Chuang,YU Ke-ke,LUO Qi-ling,LONG Wu-jian.Facile Preparation and Characterization of Carbon Dots with Schiff Base Structures Toward an Efficient Corrosion Inhibitor[J].Surface Technology,2023,52(10):229-240, 258 |
| 含席夫碱结构碳点缓蚀剂的简易可扩展制备及性能研究 |
| Facile Preparation and Characterization of Carbon Dots with Schiff Base Structures Toward an Efficient Corrosion Inhibitor |
| 投稿时间：2022-09-09 修订日期：2023-02-06 |
| DOI：10.16490/j.cnki.issn.1001-3660.2023.10.018 |
| 中文关键词: 碳点 缓蚀剂 席夫碱 吸附 可扩展制备 |
| 英文关键词:carbon dots corrosion inhibitor Schiff base absorption scalable preparation |
| 基金项目:国家自然科学基金-山东联合基金(U2006223);新型功能化碳点提升滨海环境混凝土氯离子固化能力及其机理研究(52208273);深圳市科技计划项目(JCYJ20190808151011502);广东省重点领域研发计划项目(2019B111107003)。 |
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| Author | Institution |
| LI Xue-qi | Key Lab of Coastal Urban Resilient Infrastructure,Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering,College of Civil and Transportation Engineering, Shenzhen University, Guangdong Shenzhen 518060, China |
| HE Chuang | Key Lab of Coastal Urban Resilient Infrastructure,Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering,College of Civil and Transportation Engineering, Shenzhen University, Guangdong Shenzhen 518060, China |
| YU Ke-ke | Key Lab of Coastal Urban Resilient Infrastructure,Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering,College of Civil and Transportation Engineering, Shenzhen University, Guangdong Shenzhen 518060, China |
| LUO Qi-ling | Key Lab of Coastal Urban Resilient Infrastructure,Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering,College of Civil and Transportation Engineering, Shenzhen University, Guangdong Shenzhen 518060, China |
| LONG Wu-jian | Key Lab of Coastal Urban Resilient Infrastructure,Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering,College of Civil and Transportation Engineering, Shenzhen University, Guangdong Shenzhen 518060, China |
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| 中文摘要: |
| 目的 克服目前制备碳点(Carbon dots, CDs)缓蚀剂存在的耗时、耗能等缺点，在室温下一步制备含席夫碱结构的CDs缓蚀剂，并研究其对Q235碳钢的缓蚀性能。方法 设计了一种简易、可扩展的制备方法，以邻苯二胺和对苯醌为前驱体，无需高温加热便可在室温下反应2 h，从而获得含席夫碱结构的CDs。利用TEM等方法对其结构进行表征，并采用UV和PL光谱评估其在HCl溶液中的长期分散稳定性。通过失重法、电化学测试方法研究了不同浓度CDs对Q235碳钢在1 mol/L HCl溶中的缓蚀性能。通过SEM和三维轮廓测量仪分析腐蚀后碳钢表面形貌及化学组成，提出CDs的缓蚀机理。结果 CDs含C=N键，具有多种含氧、含氮基团，有利于其在钢表面的吸附。CDs在HCl溶液中具有长期分散稳定性。当添加浓度为200 mg/L时，其对碳钢在1 mol/L HCl溶液中的缓蚀效率可达到95.05%。CDs为混合型缓蚀剂，能够同时抑制阴极和阳极反应。CDs在碳钢表面的吸附方式遵循Langmuir等温吸附模型，其缓蚀机理为通过物理和化学吸附方式在碳钢表面形成一层保护膜，从而抑制碳钢的腐蚀。结论 成功为CDs缓蚀剂的合成提供了一种简易、可扩展、高效、省时的方法，而且证明了具有席夫碱结构的CDs对碳钢在1 mol/L HCl溶液中的腐蚀具有显著的抑制能力。 |
| 英文摘要: |
| This work aims to design a facile and scalable approach to prepare carbon dots (CDs) with Schiff base structures toward an efficient corrosion inhibitor, and to study the inhibition performance of CDs for Q235 carbon steel in 1 mol/L HCl solution. CDs were prepared by Schiff base reaction at room temperature (25 ℃) for 2 h only using p-benzoquinone (p-BQ) and o-phenylenediamine (o-PD) as precursors without special oxidation reagents and equipment. The highly energy-intensive and time-consuming preparation protocol was avoided through the designed approach. The particle size distribution, morphology and structure of the as-prepared CDs were characterized with a transmission electron microscope (TEM). The CDs were favorably distributed without aggregation, and had a size distribution of 6.94–24.43 nm with an average size of 15.72 nm. The main functional groups and chemical composition of CDs were characterized with Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). Those analyses demonstrated that there were numerous O- and N-containing functional groups on the surfaces of CDs. These groups endowed Sc-CDs with excellent hydrophilic properties. And the production of Schiff base structures from Schiff base reaction during the preparation potentially made CDs serve as a promising corrosion inhibitor. The long-term dispersion stability was observed with Ultraviolet-visible (UV-vis) absorption spectra and Photoluminescence (PL) spectra, manifesting the essential precondition for CDs application as an acid-based corrosion inhibitor. The corrosion inhibiting properties of synthesized CDs for Q235 carbon steel in 1 mol/L HCl solution were systematically investigated by weight loss test, electrochemical impedance spectra (EIS) and potentiodynamic polarization (PDP) measurement. It could be noticed from the weight loss test that after adding in CDs, the corrosion rate vastly declined regardless of CDs concentration or immersion time. Furthermore, the results from electrochemical measurements showed that compared with other N-doping CDs, the as synthesized CDs with Schiff base structures exhibited more outstanding inhibition efficiency of more than 95% (measured by PDP) for Q235 carbon steel only at 200 mg/L concentration. This could be attributed to the efficacious protective film formed by CDs adsorption. The adsorption isotherm analysis confirmed that CDs could attach to the Q235 carbon steel surface by both chemisorption and physisorption. Three-dimensional (3D) morphologies of all the sample surfaces were measured through a 3D scanning measuring instrument and a scanning electron microscopy (SEM) equipped with Energy Dispersive X-ray Spectrometer (EDS) analyses. With the inhibiting of CDs, the surface roughness of carbon steel was reduced dramatically. The homogenous protective film established by CDs adsorption enormously restrained mental corrosion inflicted by HCl. And according to electrochemistry analyses, adsorption isotherm and corrosion morphology characterization, the inhibition mechanism of CDs was rationally attributed to the protective film established by CDs chemical and physical adsorptions. This work provides a facile, scalable, energy-efficient and time-saving approach for the synthesis of CDs as corrosion inhibitor, avoiding the time-consuming and energy-intensive shortcomings in the preparation of CDs corrosion inhibitors. Moreover, it firstly evidences significant inhibition capacities of CDs with Schiff base structures. The current results significantly guide the development of truly low-cost and efficient CDs corrosion inhibitors. |
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