Hanlin Shao,Duanzhi Li,Zhihao Chen,Xiaoshuang Yin,Yun Chen,Ying Liu,Wenzhong Yang
In this study, sulfur dots (GA-SDs) synthesized by using Gum Arabic (GA) as a green stabilizer were used as corrosion inhibitors and their inhibition effect for Q235 steel in 3.5- wt% NaCl solution was investigated by weight loss, electrochemical tests, and surface and interface analysis. The results revealed that the inhibition efficiency reached the maximum value of 96.5% at 250 mg/L and the water-soluble GA-SDs were able to adhere to the iron surface through the diffusion and agglomeration effect. The unique antibacterial activities demonstrated a 99.35% inhibition efficiency at 250 mg/L. Moreover, the optical properties endowed the inhibitors with the fluorescence tracing function, which is an effective approach to detecting the residual quantity of water treatment agents. This work may facilitate the development of the next generation of multifunction water treatment agents in industrial circulating water systems.
Lihua Shen,Yanwei Su,Kunpeng Zhao,Chunxia Yu,Jundan Tang,Yuangang Li,Na Liu
Manipulating surface organic ligands has emerged as a useful strategy to enhance the efficiency of catalysis. Here, a novel photocatalyst of S dots/MoS 2 nanocomposite with the ligand of polyethylene glycol 400 (PEG) or poly (sodium-p-styrenesulfonate) (PSS) was synthesized. Compared to pure S dots and MoS 2 , S dots/MoS 2 nanocomposite modified with PEG inhibited the photocatalytic activity, while the S dots/MoS 2 nanocomposite modified with PSS exhibited improved photocatalysis efficiency. And degradation efficiency of S dots/MoS 2 -PSS was achieved to be 88% (120 min) and 83% (90 min) for degradation of Rhodamine B (RhB) and Doxycycline hydrochloride (DOX), respectively. It was found that the ligand mainly affect the energy gap and the conduction band potential of the photocatalyst, leading to different photocatalysis activity. When S dots-PSS and MoS 2 were combined, the photoelectric conversion performance was enhanced and the recombine of the photogenerated carriers were depressed. And the low conduction band potential of photogenerated electron facilitate to produce of •OH and •O 2 - radical. This study provides a new photocatalysts and also give a reference on the ligands option of designing efficient photocatalysts.
Zixuan Ding,Peilin Wang,Zhenrun Li,Yupeng Guo,Qiang Ma
The combination of highly sensitive electrochemiluminescence (ECL) techniques with localized surface plasmon resonance (LSPR) effect can achieve the highly sensitive and specific detection in the analytical and biosensing applications. However, how to effectively improve the electromagnetic field intensity is an unresolved issue. Herein, we have developed an ECL biosensor based on sulfur dots and [email protected] nanorod array architecture. Firstly, the high luminescent sulfur dots with ionic liquid capping (S dots (IL) have been prepared as the new ECL emitter. The ionic liquid greatly improved the conductivity of sulfur dots in the sensing process. Furthermore, [email protected] nanorods array structure was constructed on the electrode surface by the evaporation induced self-assembly. On the one hand, the LSPR of [email protected] nanorods was more significant than that of good nanomaterial due to the plasma hybridization and the competition between free electrons and oscillating electrons. On the other hand, nanorods array structure had strong electromagnetic field intensity as hot spots due to the surface plasmon coupling ECL effect (SPC-ECL) effect. Therefore, the Au @Ag nanorods array architecture not only greatly enhanced the ECL intensity of sulfur dots, but also changed the ECL signals into polarized emission. Finally, the constructed polarized ECL sensing system was used to detect the mutated BRAF DNA in the eluent of thyroid tumor tissue. The biosensor showed the linear range from 100 fM to 10 nM with a detection limit of 20 fM. The satisfactory results demonstrated that the developed sensing strategy had great potential in the clinical diagnosis of BRAF DNA mutation in thyroid cancer.
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