Removal of Glyphosate from Aqueous Solution by Zn-Al-Zr LDH/GO
Using zinc chloride,aluminum chloride hexahydrate,zirconyl chloride octahydrate,and graphene oxide as raw materials,with sodium hydroxide and sodium carbonate monohydrate as alkaline solutions,the Zn-Al-Zr LDH/graphene oxidized(LDH/GO)nanocomposite was synthesized via a coprecipitation method.XRD,SEM,BET and UV-Vis spectrophotometers were employed to characterize the s in terms of phase composition,microscopic morphology,pore structure and adsorption process of the Zn-Al-Zr LDH/GO composite material,respectively.Our findings indicate that the incorporation of GO can improve the morphology and structure of LDH.The adsorption capacity of LDH/GO for glyphosate was found to be 10.707 mg/g under the conditions of temperature at 303 K,pH=7 and a dosage of 0.5 g/L.The adsorption process follows the quasi-second-order kinetics and Freundlich isothermal adsorption models.The mechanism by which glyphosate is removed by LDH/GO is through electrostatic attraction and surface complex formation.The glyphosate adsorption performance of LDH/GO surpasses that of the current commercial phosphate adsorbent,Phoslock.Therefore,Zn-Al-Zr LDH/GO is an effective glyphosate removal agent.
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