Letian Chen's research while affiliated with Henan Normal University and other places
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Publications (7)
Mercury ion (Hg²⁺) is a highly toxic and ubiquitous pollutant, whose effective detection has aroused widespread concern. A novel ratiometric fluorescent sensor has been designed to rapidly and efficiently detect Hg²⁺ based on blue/red carbon dots (CDs) with environmental friendliness. This sensor was well characterized via TEM, FTIR, XPS, UV–vis, a...
p-Aminoazobenzene (pAAB) is a hazardous azo dye that causes considerable harm to human health and the environment. The development of novel and sensitive sensors for the rapid detection of pAAB is in high demand. In this study, a simple fluorescent sensor for pAAB detection is designed based on carbon dots (CDs) which are prepared using green carbo...
A newly green molecularly imprinted polymer (MIP) for kitasamycin (KITA) was synthesized in water by using 1-allyl-3-vinylimidazolium chloride ionic liquid and 2-acrylamide-2-methylpropanesulfonic acid as co-functional monomer on the surface of poly (styrene-divinylbenzene) particles. The prepared MIP has excellent selectivity for KITA in mixed sol...
A novel eco-friendly molecularly imprinted polymer (MIP) was proposed as solid-phase extraction (SPE) adsorbent to selective adsorption tylosin (TYL) in animal muscle samples. The MIP was synthesized in aqueous by using 1,4-butanediyl-3,3-bis-1-vinyl imidazolium chloride and 2-acrylamide-2-methylpropanesulfonic acid as bifunctional monomer. The obt...
The widespread occurrence of sulfathiazole (STZ) in the environment has raised concerns regarding the potential risks to ecosystem and human health. Thus, there is a need to develop facile and efficient methods for monitoring STZ. In this study, a novel fluorescent probe, based on N, B, F co-doped carbon dots (N, B, F-CDs), was developed for the hi...
A novel green hydrophilic levofloxacin imprinted polymer was presented via one‐step polymerization in water using ionic liquid 1,6‐hexa‐3,3’‐bis‐1‐vinylimidazolium bromine with multiple hydrophilic groups and 2‐hydroxyethyl methacrylate as a co‐functional monomer. Adsorption experiment revealed that the ionic liquid significantly improved the water...
Citations
... The IFE mechanism occurs when an overlap occurs between the acceptor's absorption spectrum and the CQD's excitation or emission spectra (Molaei 2020;Rahal et al. 2021). Timeresolved fluorescence lifetimes measurement and the UV absorption spectra are essential tools used to evaluate the quenching mechanism of CQD-based nanoprobe Liu et al. 2024). The fluorescence lifetime and the absorption spectra of N, S-CQDs, N, S-CQDs + Pb 2+ , and N, S-CQDs + Pb 2+ + F − are shown in Fig. 4a and b. ...
... The use of MIPs as a solid sorbent can greatly improve the extraction efficiency of PSPE due to its specific recognition ability and high resolution [40,41]. Chen et al. [42] used the multi-functional monomer strategy to synthesize MIPs with specific recognition as the adsorbent of PSPE. The method is economical, efficient and environmentally friendly. ...
... The N-H deformation vibration is observed at 831 cm −1 [49]. The FTIR signals demonstrate that CDs have hydrophilic functional groups (hydroxyl, amino and carboxyl groups) that promote water solubility and fluorescence of the synthesized CDs [50]. Figure 3c shows the 1 H-NMR spectrum of CDs. ...
... In addition, they are used in supported ionic liquids membranes (SILM) techniques, where they impregnate polymer membranes used for the separation of organics, metals and gasses in place of standard organic solvents [12] . They are also used as surface modifiers for carbon and non-carbon sorbents such as silica or metal-organic frameworks (MOFs) [13][14][15] . ...
... The hydrothermal/solvothermal technique synthesizes relatively insoluble materials under conventional conditions by using a reaction kettle under high temperature in the presence of an aqueous solvent or mineralizer, and a heterogeneous chemical reaction takes place to dissolve and recrystallize [46,47]. Zhang et al. [48] hydrothermally synthesized blue, green, yellow-green and orange-red CDs by a one-pot hydrothermal method using o-phenylenediamine as a carbon source, with QY of 88.9%, as shown in Figure 2. ...
... The performance of the developed MIP-based analytical method was compared with those of previous ones based on diverse systems such as liquid chromatography, fluorescence, and electrochemical method (Table 4). Different sorbents have been utilized for the trace detection of LEVO in many forms of real samples including ionic liquid and deep eutectic solvents imprinted polymer [49,50], carbonized polymer and CdTe quantum dots [51,52], covalent and metal organic frameworks [53,54], reduced graphene oxide modified with multiwalled carbon nanotubes [55], and carbon paste enhanced nano-sized fumed silica electrodes [56]. As compared to other reported methods, mMIP showed a better detection limit of 0.07 ng/mL for LEVO. ...
