| 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],52(10):229-240, 258 |
| Facile Preparation and Characterization of Carbon Dots with Schiff Base Structures Toward an Efficient Corrosion Inhibitor |
| Received:September 09, 2022 Revised:February 06, 2023 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2023.10.018 |
| KeyWord:carbon dots corrosion inhibitor Schiff base absorption scalable preparation |
| 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 , 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 , 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 , 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 , 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 , China |
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| Abstract: |
| 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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