Cu²⁺ Uptake Mechanism Of Feather Liquid Filtered Material

Cu2+ is widespread in the industrial effluent such as Electroplating factory, circuit board factory, printing and dyeing mill, which pollute crops severely. Cu2+, a kind of heavy ions,can make proteins lose activity. Those who take in it excessively may exhibit poisoned phenomena like nausea, vomiting, acute hemolysis.Therefore, it is imperative to purify Cu2+ in the industrial effluent.The average methods are chemical sedimentation, ion exchange, electrolyzation, metal chelation and so on.However,the cost is too much. By contrast, biological absorption materials,which cost low with good effect, are widespreadly concerned in recent years.In our country,feahers, a kind of cheap natural resources, are mainly treated as waste.There have been studied that feather keratin,with high-activity groups and the complex shapes,is a very good adsorption to Cu2+, but the uptake mechanism is not explicit.Therefore, the research of Cu2+ uptake mechanism by feather liquid filtered material in industrial waste water,is in favor of providing theoretical basis for purifying industrial effluent with Cu2+ and is significant for resources economy and environmental protection.This topic mainly studies the Cu2+ uptake mechanism of feathers in CUSO4 solution by Spectroscopy.First,test the Cu2+ uptake amount of feathers by measuring absorbancy and analyse the inner structure change of feathers before and after Cu2+ absorption by EPR,FT-IR,XRD.Next,modify feathers by acid,alkali and ultrasonic respectively to improve the absorptive ability of feathers.And then,analyse the inner structure change of feathers due to modification by FT-IR,XRD,in order to further deduce the the Cu2+ uptake mechanism.Next test the cyclic utilization of feathers'Cu2+ absorption by repeating absorption and desorption. After research,I find that the non-modified feather fibers immersed into CUSO4 solution have the Cu2+ absorption ability but not strong. Cu(Ⅱ) exist in feather with 3 coordinating structure.One of them is main S, coordinated in covalent bonds,another two mainly coordinate with N atoms and the covalent bonds exist as well as electrovalent bonds.After absorbing Cu2+,αhelical structures increase butβsheet structures decrease.After one hour's modification with acid,alkali and ultrasonic respectively,the uptake ability of NaOH modified feathers is best. To them,both a helical structures andβsheet structures are destroyed and take part in absortption.When feathers are modified with NaOH extending to a certain time,the main reaction is the change of (3 sheet structures to a helical structures.Maybe a helical structures are more absorptive thanβsheet structures Repeating absorption and desorption increase the absorption sites and the absorption ability.In practical applications, feather fibers are easy to disperse,so it is usually using feather nonwoven material.In this topic,feather mixed with ES are made into nonwovens,modified with NaOH,to compare the Cu2+ absorption ability of feather nonwovens with different ES contents.Because in printed circuit board factory waste water,Cr(VI) and Cu2+ are main pollution,so this topic also research the relationship between Cu2+ uptake ability of feather nonwovens and initial Cr contents.The results show that as long as the content of feather fibers are equal,the proportion of ES fibers does not affect NaOH modified felt very much.Non-modified felt has less Cu2+ absorption ablity than modified felt.The absorption ablity difference of feather fibers and feather felt is not much. As the initial Cr content increases,NaOH modified feather felt absorbs less Cu but more Cr.This topic's innovation is analysing feathers'structure by EPR after Cu2+ absorption and test the cyclic utilization of feathers.