Preparation And Properties Of Polyacrylic Acid-Polyol/Alcohol Amine Polycondensate And Carbon Quantum Dot Surfactant

With the development of industry,a large amount of wastewater containing organic dyes and metal ions is discharged into the environment,organic dyes and metal ions are difficult to degrade naturally and have highly toxic,thus causing great harm to the environment and biological.Dyes and heavy metal ions entering the environment will enter the human body through the food chain,so this will lead to various diseases.Therefore,wastewater treatment has become a hot spot in current research.In this paper,we synthesized a polycondensate material with excellent adsorption properties in a simple and easy way.The main contents are as follows:The polycondensation materials PAA-EG and PAA-GI were synthesized from polyacrylic acid?PAA?,ethylene glycol?EG?and glycerol?GI?,preferred reaction conditions for optimum adsorption performance.The materials were characterized by infrared and scanning electron microscopy.The adsorption properties of adsorbent materials and alkalized materials on dyes and metal ions were investigated.The results show that the adsorption of MB by polycondensate material can accord with quasi-secondary kinetic adsorption.The thermodynamics study shows that the adsorption behavior accords with Langmuir adsorption model,and the equilibrium adsorption capacity is 404.86and 409.83mg g^-1,respectively.The alkalized adsorbent has adsorption properties for metal ions,and the adsorption capacities for Co²⁺and Ni²⁺are both over 200and 290 mg g^-1;it also has certain application potential in drug adsorption and sustained release.The polycondensation materials PAA-EG and PAA-GI were synthesized from polyacrylic acid?PAA?,diethanolamine?DEA?and triethanolamine?TEA?,preferred reaction conditions for optimum adsorption performance.The materials were characterized by infrared and scanning electron microscopy.The polycondensate material is alkalized to adsorb the dye and the metal ion,respectively,and it is found that the alkalized polycondensate material has selectivity for dye adsorption;The adsorption performance of Co²⁺and Ni²⁺was good.The adsorption capacity of the drug MTX and DOX was higher than 100mg g^-1,and the cumulative release rate was higher than 64%and 30%,respectively.Using citric acid and 3-dimethylaminopropylamine as raw materials,hydrothermal synthesis of carbon quantum dots,carbon quantum dots and chlorinated alkane quaternization reaction,to obtain carbon quantum dot surfactants.Structural analysis was carried out by means of infrared,ultraviolet,nuclear magnetic,fluorescent,scanning electron microscopy and other means.The surface tension,foaming and bacteriostatic experiments were carried out.The results are as follows:CQDs-C₁₂H₂₅5 can reduce the interfacial tension of water to 32 mN m^-1;the antibacterial activity against E.coli found that the prepared carbon quantum dot surfactants have better antibacterial properties,while CQDs-C₁₆H₃₃3 has the best antibacterial activity.