Study On The Preparation And Adsorption Properties Of The Luffa Sponge-Anion Exchange Fibers

Our country has abundant biomass resources, including crops and waste. For many reasons, most of biomass were discarded instead of being utilized, which not only wasted valuable resources, but also caused the pollution of water and air. An excess of nitrate and nitrite could cause the eutrophication of water, which also threaten the health of people and live of aquatic organism. Ion exchange and adsorption method was a quick and efficient way to deal with the nitrate nitrogen. This article based on other people’s research, using luffa sponge as a raw material, a new natural polymer environmental protection--Iuffa sponge anion exchange fibers synthesized by means of modification, and the adsorption ability and condition of application to the nitrate were analysed.Combining the research results of predecessors, the modifying method was confirmed, The best reaction conditions of experiment were confirmed through a orthogonal experiment and it’s result. Furthermore. The most important impact factors were found,the dosage of epichlorohydrin and dimethylamine, the temperture of reaction process, and the time, which affect the success rate of subsequent grafting reaction directly. Then the best adsorption product was made, and several analytical method such as scanning electron microscope and linfrared spectrum were adopt to contrast the molecular structure and the surface texture of the raw material and the product, we found that the tertiary amine group were grafted successfully. Some part have blow out, which was conducive to adsorption. Seveal inspection techniques were used to detect the product’s performances such as adsorbability, the optima calibration of pH, the contact time, the regeneration efficiency, the compectitive adsorption and so on. This text draw a conclusion that60min was the optima static adsorption time and the maximum absorption capacity could reach1.84mmol/g. When the pH value of water ranged in6-10, the product’s adsorbability was optimal. The competitive adsorption test confirmed that the product’s selective absorption for the sulfate was better than the nitrate. According to adsorption kinetics and absorption thermodynamics. We confirmed that the product’s absorption for nitrate was physical adsorption. The adsorbability was decreased because of the increasing of temperature. According to the isothermal adsorption equations, we knew that adsorption is not a simple monolayer adsorption, but a S type adsorption isotherm. The adsoption was weak, so the desoption was easy, and the regenerability was good. At last, by means of contrasting with other adsorption material, this text confirmed that the product has some unique advantages. For example, it was forrmed by natural ways, the preparation techonlogy was simple, the regeneration methods was easy, which provided a reference for the development and utilization of biomass resources, and also a valuable data for the industrial application of the product.