Preparation And Performance Test Of Cr (Ⅵ) Anion Fluorescent Imprinted Microspheres

Hexavalent chromium is internationally recognized as carcinogen, mainly through the unreasonable discharge into the environment, polluted water and soil environment, a serious threat to human health and ecological environment. The traditional method of processing raw material demand not only cost is high, and the processed sewage in the Cr （VI） content is still high. For reasons of costs and repeat utilization, chromium containing wastewater treatment by adsorption method is a feasible method. Ion imprinting technology as a kind of new adsorption method, has high adsorption capacity, the advantages of good selectivity and can be reused, cause the attention of the researchers.So this paper mainly uses distillation precipitation and surface imprinting polymerization molecularly imprinted polymers （MIPS）, Cr （VI） was synthesized using silica, respectively ferroferric oxide as polymer matrix, the FT-IR, SEM, BET, VSM, TG and EDX spectroscopy of molecularly imprinted polymer characterization, study their adsorption performance.1. The average precipitation polymerization was used to O₂O72- and as a template,4-vinyl pyridine （4-VP） as functional monomer, ethylene glycol dimethyl acrylate （EGDMA） as crosslinking agent, isopropyl alcohol/water solution as solvent, Cr （VI） ion imprinted polymer was synthesized. Focuses on the copolymerization monomer, crosslinking agent and synthetic factors such as the type and dosage of solvents to Cr₂O₇^2- ion imprinted polymer adsorption performance influence. Adsorption experiments investigates the ion selective ion imprinted polymer for the template, the results showed that Cr molecularly imprinted polymers （MIPS） for Cr （VI） ion adsorption capacity of 54.25 mg/g.2. Using silica （SiO₂） as polymer matrix, using divinyl benzene （DVB） as crosslinking agent, NVC as functional monomer, the Cr （VI） prepared by precipitation polymerization method ion imprinted polymer microspheres. Experiment examines the intensity of fluorescence recovery and the relationship between the adsorption amount of Cr （VI）, functional monomers and crosslinking agent on the influence of the microspheres, the optimum polymerization conditions were determined. Adsorption experiments investigates the ion imprinting polymer to Cr₂O₇^2-selective, the results show that the ion imprinting microspheres on its own template ion adsorption capacity is 74.28 mg/g.3. The introduction of modified Fe₃O₄ magnetic particles as a cue ball, surface imprinting polymerization methods, magnetic Cr （VI） ion imprinted polymer was prepared. By optimizing the experimental synthesis of magnetic Cr （VI） ion imprinted polymer template when Cr （VI）, functional monomer, crosslinking agent and initiator of the best addition amount, and under the condition of the synthesis of Cr （VI） ion imprinting. Adsorption experiment results show that the Cr （VI）, molecularly imprinted polymer corresponding to its own template ion adsorption capacity of 90.84 mg/g。...