Anion Adsorption Complexing Agent

This topic is aimed at a large number of organic anionic contaminants(mainly sulfonic acid groups and carboxylic acid groups)produced in the production process of H acid,and designs a starch-based product with a quaternary ammonium group,and the quaternary ammonium group is linked.There are ethyl chain links.Through the introduction of the ethyl chain link,the hydrophobic property of the starch-based product can be increased,and the starch-based product can exert an intermolecular action on the hydrocarbyl moiety of the organic molecule in the H acid,and the introduction of the quaternary ammonium group can make the starch-based product to the H acid.The intermediate anionic group generates charge attraction or acid-base complexation,which reduces the solubility of anionic groups in the wastewater,thereby effectively removing anionic organic matter in the wastewater.In the experiment,a starch-based organic anion adsorption complexing agent was synthesized by a two-step method.The first step was to prepare triethylallyl ammonium chloride monomer from triethylamine and allyl chloride,and the material distribution was studied by changing the single factor method.The influence of reaction conditions such as ratio,reaction time and solvent ratio on the conversion rate of raw materials.Triethylamine conversion and product yield were determined by silver nitrate titration and acid-base titration.The optimum ratio of the mass ratio of 30% ethanol solvent,9h,40? and n-allyl chloride: n triethylamine=1.6:1 was determined,and the monomer conversion rate was 98.2%.The analysis of the infrared spectrum and the NMR spectrum indicated that the synthesized triethylallyl ammonium chloride was consistent with the expected structure,and the next reaction was carried out.In the second step,the graft copolymerization reaction of corn starch with triethylallyl ammonium chloride synthesized in the first step was carried out to investigate the solvent ratio,the amount of initiator,the reaction time and temperature,and the monomer concentration in the reaction system.The influence of reaction conditions such as pH valueon product monomer conversion rate and final product yield.With n potassium permanganate:n starch=1:100,reaction temperature and reaction time is 60? and 5h,m starch: m monomer=1: 0.5,ethanol content 40%,adjust the initial pH value of 3 is the best Under the reaction conditions,the conversion of the monomer at this time was 76.1%,the yield of the product was 67%,and the degree of cationization was 12.22%.The elemental analysis and infrared spectrum analysis indicated that the synthetic starch-based graft copolymer was consistent with the expected structure and could be applied in the next step.In the application experiment,the effect of adsorption and complexation of starch-based products was discussed.The effect of pH and dosage on the adsorption and complexation of anionic substances in H-acid solution was studied by single factor method.The concentration of the remaining solution was determined by ultraviolet spectrophotometry to calculate the removal rate of the anionic group.The optimum treatment condition is pH4,the product dosage is 1.5g,and the removal rate can reach 64.89% under this treatment condition.Based on the optimal processing conditions,the effect of different hydrophobicity of the product on the adsorption complexation effect was observed by changing the alkyl group attached to the ammonium group.Experiments have shown that the addition of a suitable hydrophobic group can better remove the organic anionic species in the H-acid.Compared with other adsorbents,the removal rate of single adsorbent is about 60%.When the product is combined with inorganic adsorbent,the adsorption rate can reach 64%,and the adsorption rate can reach16.96mg/g.