High-efficiency Removal Of Trace Heavy Metals And Phosphate In Water Based On Novelamyloid Fiber

Heavy metals and phosphates in the water environment cause serious pollution to the ecological environment and affect human health.In this paper,bio-materialβ-Lactoglobulin nanofiber was prepared by simple alkaline heating.Based onβ-lactoglobulin nanofiber adhesion medium,D201-fiber-ZrO₂ film was prepared by vacuum filtration using D201 as the substrate and use the above two materials to remove heavy metals and phosphates from the water.In this experiment,the SEM,TEM,XRD,FT-IR and other characterization instruments were used to analyze the micro-structure and group structure.The results show thatβ-lactoglobulin nanofiber was a fibrous amorphous nano-structure,with a length of 2μm and a width of 5nm.The length ofβ-lactoglobulin nanofiber loaded with ZrO₂remains unchanged,while the width changes to¹3nm.First usedβ-lactoglobulin nanofiber to treat lead-containing wastewater.Under the condition of high concentration of Ca（Ⅱ）/Mg（Ⅱ）/Na（Ⅱ）ions coexistence,the material still showed high selective adsorption performance for Pb（Ⅱ）.Kinetic results showed thatβ-lactoglobulin nanofiber could rapidly adsorb Pb（Ⅱ）within 60s and reach saturation.What’s more,the actual application capacity of theβ-lactoglobulin nanofiber（approximately 44 m³ of contaminated waste-water/kg of adsorbent）far exceeds that of commercial ion exchange resins,and the effluent concentration is lower than the world health organization’s recommended drinking water standard（10μg/L）.The significant adsorption properties of the material for Pb（Ⅱ）can be attributed to the ultrafine nanofiber structure and the abundant amino acid groups on the protein.The sub-10nm ZrO₂ was synthesized in situ on the fiber,and the D201-fiber-ZrO₂membrane was prepared by vacuum filtration using D201 powder as the substrate.Membrane materials have high adsorption capacity for Pb（Ⅱ）,Cr（Ⅵ）,Cu（Ⅱ）,Cd（Ⅱ）,F^-,P（Ⅴ）,and for Pb（Ⅱ）,F^-,P（Ⅴ）Shows excellent selective adsorption behavior.The pH effect experiments show that the material can efficiently remove target contaminants over a wide pH range.When the mixed liquid containing many kinds of target pollutants was filtered by the material,it has a strong removal ability for each kind of pollutant ion,and the efficiency is maintained at 99.9%after more than 5 cycles.In addition,D201-fiber-ZrO₂ membrane can efficiently treat high（100mg/L）and low（10mg/L）P（Ⅴ）,Cr（Ⅵ）,Pb（Ⅱ）solutions.These results indicate that the D201-fiber-ZrO₂ membrane can well alleviate the environmental pollution caused by heavy metals and anionic pollutants such as phosphate.