7results about How to "Improve selective recognition" patented technology

The invention relates to the technical field of nano material preparation and environmental analysis chemical detection, in particular to a surface imprinting fluorescence-surface enhanced Raman dual-sensing probe as well as a preparation method and application thereof. The probe is NH2-MIL-53 (Al) (at) MIPs / AuNPs, the NH2-MIL-53 (Al) (at) MIPs / AuNPs take NH2-MIL-53 (Al) as a core and take MIPs as a shell, a core-shell structure is formed, and AuNPs are subjected to in-situ reduction growth; a template molecule of the MIPs is p-nitrophenol, and a functional monomer of the MIPs is dopamine. Compared with the prior art, the surface imprinting fluorescence-surface enhanced Raman dual-sensing probe prepared by the invention combines two detection technologies to achieve dual signal recognition, has extremely high sensitivity and selectivity, and is suitable for detecting p-nitrophenol in samples with low concentration and complex components.

The invention provides a phenanthroimidazole Schiff base iron ion fluorescent probe compound as well as synthesis and application thereof, and belongs to the field of chemical synthesis and the technical field of cation detection. 4, 4 ', 4'-methylene triphenol, ethyl chloroacetate, hydrazine hydrate, phenanthrenequinone and 4, 4 '-biphenyldicarboxaldehyde are used as raw materials, the target product is synthesized in three steps, the process is simple, the reaction condition is mild, the reaction time is short, and the reaction is rapid and efficient; mercury salt and other toxic substances are not used in synthesis, so that toxic and side effects in reaction are reduced, and the method is safe, reliable, green and environment-friendly; raw materials in synthesis are low in price, the catalyst is extremely easy to remove, the synthesis process is simplified, and the comprehensive cost of synthesis is effectively reduced; and the final product is high in yield and high in purity. The compound can recognize Fe < 3 + > with high sensitivity and high selectivity, and has a good industrial analysis application prospect.

The application discloses a fluorescent molecular probe based on triphenylamine derivative and a preparation method and application thereof, and belongs to the technical field of fluorescent molecular probes. The application solves the problems of low sensitivity, slow response speed and poor selectivity of the current fluorescent molecular probe for H2S level detection. The application uses 5-(4-(diphenylamine)phenyl) thiophene-2-carboxaldehyde and 4-amino-3-hydroxybenzoic acid to prepare a triphenylamine derivative, and the derivative can be used as a fluorescent molecular probe HBA for detecting H2S. In the detection process, H2S is coordinated with the carbon-nitrogen double bond in HBA and the oxygen in the hydroxyl group, a cyclization reaction occurs, a six-membered ring is formed, and fluorescence quenching is caused. The HBA has the advantages of low detection limit, high selectivity and anti-interference, fast response speed, low cytotoxicity, excellent membrane permeability, can realize real-time fluorescent imaging of cells, and can be used for detecting H2S level in non-alcoholic fatty liver disease.

The invention discloses a method and a system for directionally removing non-volatile acid radicals and recovering urea in high-concentration urea wastewater, and belongs to the technical field of wastewater treatment and resource recovery. The method comprises the following steps: firstly, introducing wastewater into a pretreatment unit, adding a synergistic treatment agent compounded by alkali metal salt, an organic complexing agent and nano catalytic particles, and directionally precipitating non-volatile acid radicals to form a compact precipitate; intensified solid-liquid separation is completed through an ultrasonic-assisted horizontal spiral discharging sedimentation centrifuge, residual acid radicals in supernate are deeply adsorbed through graphene quantum dot-temperature responsive magnetic nanoparticle composite modified anion exchange resin, and the acid radicals are almost completely removed; then, urea is concentrated by adopting a low-temperature evaporation-waste heat recovery coupling process, and high-purity urea crystals are separated out through segmented temperature-pressure gradient crystallization; the resin saturated by adsorption is separated and recovered through a magnetic field, and is recycled after temperature regulation and mild regeneration; the method is suitable for resourceful treatment of industrial high-concentration urea wastewater.

The invention belongs to the technical field of fluorescence sensing detection, and particularly relates to a fluorescence sensor based on Ln-BMOF and a preparation method and application thereof. The preparation method comprises the following steps: mixing and dissolving Tb (NO3) 3.5 H2O, Eu (NO3) 3.5 H2O, 2-aminoterephthalic acid and o-fluorobenzoic acid in a DMF / H2O mixed solvent, heating, cooling to room temperature, filtering, and drying in vacuum to obtain the sensor Eu < 0.01 > Tb < 0.99 >-BDC-NH2. The device is quick in response, wide in application range and good in durability; in a wide pH range, the stable performance is still maintained after multiple times of recycling. The Eu < 0.01 > Tb < 0.99 >-BDC-NH2 obtained by the invention can be directly detected in an aqueous solution, is suitable for actual water sample analysis, can be repeatedly used, and provides a novel platform for on-site rapid screening of PA and Fe < 3 + > in the environment.

The application discloses a fluorine-containing anion adsorption site modified non-interface polyimide-based acetylene separation membrane and a preparation method and application thereof, and comprises a polymer continuous phase and a fluorine-containing anion salt uniformly dispersed in the polymer continuous phase; wherein the polymer continuous phase is a polyimide matrix containing 6FDA structural units, the fluorine-containing anion in the fluorine-containing anion salt is tetrafluoroborate and / or hexafluorophosphate, and the fluorine-containing anion in the fluorine-containing anion salt cooperates with a fluorine-containing structure in the polyimide matrix to construct an acetylene adsorption microenvironment in the polymer continuous phase as an acetylene adsorption site. Unlike a traditional mixed matrix membrane, the application does not depend on porous fillers such as metal organic frameworks, molecular sieves or covalent organic frameworks, and can effectively solve the non-selectivity defects caused by particle agglomeration and interface voids of the mixed matrix membrane. Moreover, the preparation method is simple, raw materials are easy to obtain, and the application can be used for efficient separation of acetylene-containing mixed gas.

The application relates to a double-mode fluorescence sensing chip and system based on micro-ring resonance enhancement, which comprises a chip body, the chip body is provided with a micro-ring resonator, a to-be-measured substance flow channel, an input grating coupler and an output grating coupler; the micro-ring resonator is a ring-shaped optical waveguide, and an organic fluorescent material sensitive film is arranged on the upper surface of the micro-ring resonator; the to-be-measured substance flow channel is arranged above the organic fluorescent material sensitive film, the organic fluorescent material sensitive film is located in a reaction cavity, and the reaction cavity is communicated with the to-be-measured substance flow channel. The high-Q characteristic of the micro-ring resonator cavity is utilized to convert wide-spectrum fluorescence into a sharp resonance peak, the signal strength is greatly improved, and wide-spectrum background noise is effectively filtered out. Nonlinear response is generated through the synergistic effect of fluorescence quenching and resonance wavelength shift, the detection limit reaches the sub-ppb level, the detection sensitivity is significantly improved, and the trace analysis requirement is met.