A Composite Of Bentonite/Cofe2o4/Hydroxyapatite For Lead Adsorption From Wastewater

Abstract

Heavy And Toxic Metals From Various Chemical Processing Industries Cause Environmental Pollutions And Damage Healthy Life Of The Societies. Among These Toxic Metals Is Lead, Which Causes Severe Threats To Human Health, As Well As A Major Contributor To Environmental Pollutions As It Can Be Easily Incorporated Into Ecosystems And Therefore To The Food-Chains. Thus, It Is Essential To Remove Lead From Wastewater Before Reaching To The Atmosphere. In This Work, A Composite Of Bentonite/Cofe2o4 (B/Cf) And Bentonite/Cofe2o4/Hydroxyapatite (B/Cf/Hap) Were Synthesized Via Chemical Coprecipitation Methods. Herein, A Composite Of B/Cf Was First Synthesized: (100x)B/(X)Cf Where X = 5, 15, 25 Weight Percent Of Cofe2o4 In The Bentonite Matrix. The Sample With Composition Of 85%B/15%Cf Was The Optimal Amount In Its Adsorption Capacity (19.9 Mg/G) Towards Pb2+. Ternary Composites Were Prepared With Different Weight Ratios Of Hap, I.E., 25%Hap/75%(85%B/15%Cf), 35%Hap/65%(85%B/15%Cf) And 45%Hap/55%(85%B/15cf). Among These Ternary Composites, The Sample Of 35%Hap/65%(85%B/15%Cf) Revealed Best Adsorption Capacity, Which Was Then Selected For Further Study. The Synthesized Materials Were Characterized Via X-Ray Powder Diffraction (Xrd) For Phase Purity, Scanning Electron Microscopy With Energy-Dispersive X-Ray (Sem-Edx) For Microstructure And Morphology Studies, Fourier Transform Infrared Spectroscopy (Ftir) To Determine Functional Groups, And Thermogravimetric Analysis-Differential Thermogravimetry (Tga-Dta) To Investigate Thermal Stability Of The Materials. Atomic Absorption Spectrometry (Aas) Was Also Utilized To Determine The Adsorption Capacity Of The Samples. The Adsorption Capacity Of B/Cf/Hap Was Investigated At Different Contact Time (30-120 Min) And Initial Concentration Of Lead Ion (50-200 Ppm). The Maximum Adsorption Capacity Of B/Cf/Hap Towards Pb2+ Was 67.1 Mg/G. Adsorption Isotherm Data Best Fitted With Freundlich Isotherm Model And Kinetic Behavior Adopted Pseudo-Second Order Adsorption Mechanism. The Result Of This Study Pinpoints That B/Cf/Hap Composite Is An Alternative Method For The Removal Of Lead Ion From Aqueous Sources.