Study On The Performance Of Efficient Removal Of Lead Ions By Protein-directed Iron Nanoflower Materials

With the intensification of heavy metal pollution,how to quickly and efficiently remove heavy metal ions has become a serious problem in the current environmental field.Among them,lead ion(Pb²⁺)is the most seriously and harmfully pollution to animals,plants and human.So it is the focus of heavy metal pollution.The adsorption method has been widely concerned because of its low processing cost,ease of large-scale application,wide applicability,and ability to perform advanced processing.The nanoflower material has the advantages of both inorganic and organic parts,and the size is nanometer.Therefore,it has the advantages of large specific surface area and diverse surface functional groups,and can be used as an adsorbent for the removal of Pb²⁺in polluted water.Firstly,the sericin-phosphorite nanoflower material was synthesized by self-assembly method.The material was found to have a flower-like morphology and a large number of petal-like structures which could adsorb Pb²⁺by scanning electron microscopy.At the same time,it was found by infrared spectroscopy that the surface of the material also carries a large number of active groups such as amine groups,which can react with Pb²⁺in water.Through further adsorption experiments,it was found that the optimum conditions for material adsorption were:pH=7 and adsorption temperature 60?.The maximum adsorption capacity could be achieved after 60minutes reaction.At the same time,the material has strong adsorption selectivity to Pb²⁺in water,and the presence of interfering ions has little effect on the adsorption process.Since the powder has difficulty in separating and difficult to recover in practical applications,loading the powder material onto the carrier solves this problem.Through previous studies,it was found that the material can be loaded onto the macroporous resin by polydopamine,thereby achieving the purpose of easy separation in the later stage.It was found by scanning electron microscopy and transmission electron microscopy that the experiment successfully loaded the nanoflowers onto the surface of the macroporous resin,and the loaded material still had the flower-like appearance of the nanoflowers.Further experiments have found that growth time affects nanoflower morphology and further affects its performance.The load material which grows for a longer period of time has more surface wrinkles and a larger specific surface area,and is superior to the material having a short growth time in terms of selection performance and adsorption rate.However,the properties of the two materials are greatly improved with respect to the matrix material,and the adsorption properties of the loaded materials are more excellent.