| In recent years,with the advancement of science and the industrial level,the environmental problems caused by industry have become increasingly serious,and the problem of water pollution has become the focus of attention around the world.In this regard,scientists from all over the world are looking for a way to efficiently purify water resources,such as photocatalytic degradation,adsorption,membrane separation,biological treatment,chemical solidification,etc.These methods have their own unique advantages,of course,they also have their Inadequacies,especially in social practice,are more representative of the practical value of these methods.Among them,the adsorption method,as a method with low cost,short time,high productivity and easy recycling and reuse,has opened up a vast new world in the field of water purification.Among them,natural polymer materials can also be used as adsorbents,and have been used in the field of sewage treatment due to their good biocompatibility and non-toxic side effects,and have achieved remarkable results.Sodium alginate is a natural polysaccharide,which is cross-linked with calcium ions.The calcium alginate formed has good stability and has strong adsorption capacity for dyes such as methylene blue.Graphene oxide is an extension of the development of graphene.It has more oxygen-containing functional groups on the basis of retaining the main properties of graphene,and has a wider space for use;Starch is a polysaccharide.Glucose is polymerized,and starch is widely found in nature.Previous studies have been conducted on the use of starch as an adsorbent to remove contaminants from water.Since starch is basically composed of a six-membered ring and a large amount of hydroxyl groups are present in the molecule,starch can produce a strong intermolecular force with such carbon materials,which has a loose structure after fermentation.The specific surface area has been tested to have a certain adsorption capacity for Congo red.Fermented starch/GO and starch/calcium alginate aerogel were prepared and explored and studied for the adsorption performance of Congo red pigment.The fermented flour/calcium alginate(FCA)was processed by a steamer steam heating method and a freeze drying process,and an aerogel was prepared by vacuum freeze-drying.In order to understand its surface structure and chemical composition,we conducted related tests such as electron microscopy and infrared.Through strict control of experimental conditions and repeated test methods,the specific situation of FCA adsorption of Congo red was explored.The adsorption kinetics was used to simulate the progress of the adsorption experiment.The calculation results show that the Pseudo-second-order equation is most suitable for the adsorption process.For the adsorption of Congo red isotherm analysis,fermented starch/calcium alginate(FCA)adsorbs Congo red according to the Langmuir equation,and the maximum adsorption Congo red capacity is up to 96mg/g.The thermodynamic properties of the thermodynamics were studied by adsorption thermodynamics theory.The specific data show that FCA adsorption of Congo red is more likely to occur spontaneously at lowertemperatures.The fermented flour/GO aerogel was prepared by blending freeze-drying method,and its surface morphology,molecular structure and thermal stability were analyzed by different characterization methods.Experiments were conducted to test the interference of different external conditions on the adsorption of Congo red by starch/GO aerogel.The whole process of the experiment was simulated by adsorption kinetics.The results show that the Pseudo-second-order equation is most suitable for the experimental process.The adsorption Congo red isotherm shows that the Congo red adhesion aerogel process follows the Langmuir equation,and the ultimate adsorption capacity measured by it can reach 132.54mg/g.Adsorption thermodynamics studies have found that starch/GO aerogels adsorb Congo red spontaneously and absorb heat. |
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