Study On Preparation Of A Series Of Molecular Sieves For Deep Sea Clay And Adsorption

Today,as the high-quality clay resources on the land are increasingly depleted,as an ocean with rich clay resources,it has re-entered people's vision.According to statistics,the resources of ocean clay and slime are2.1×10⁷and.1×10⁷Kg³,respectively,and the resource potential is huge.Aiming at the characteristics of deep-sea clay,a series of molecular sieves were prepared by hydrothermal synthesis.The molecular sieves were analyzed by XRD,FT-IR,and SEM,and their applications in the field of adsorption were explored.First,the deep-sea clay is purified and dried to remove sediment,and tested for its mineral and chemical composition.Then it was added to a solution of alkali,the clay mineral structure was opened under hydrothermal conditions,and it was reorganized to obtain a series of molecular sieves,namely,analcite,faujasite,and calcinite.The experimental results in this paper show that the basicity,crystallization temperature and time have a great influence on the synthesis of zeolite.The optimal synthesis conditions are optimized as follows:Anaclime:silica-alumina ratio of 2:1,crystallization temperature of 180?,crystallization time of 16 hours,sodium hydroxide concentration of 0.6mol/L,and specific surface area of26.908m²/g.Faujasite:silica-alumina ratio of 3:1,crystallization temperature of 110?,crystallization time of 12 hours,sodium hydroxide concentration of 4.75mol/L,and specific surface area of22.792m²/g.Calcinite:The volume ratio of filtrate to director is 10:2,crystallization temperature is160?,crystallization time is 16 hours,sodium hydroxide concentration is 5mol/L,and specific surface area is 23.506m²/g.The prepared zeolite was used to adsorb heavy metal ions Cu²⁺and CO₂.It was found that the adsorption of Cu²⁺ions by zeolite was affected by the adsorption time,ion concentration and the amount of zeolite input.The experimental results showed that the adsorption amount of CO₂ by cristobalite was 48.271m²/g,and when the initial Cu²⁺concentration was 80mg/L,the adsorption time At 4 hours,the Cu²⁺removal rate was the highest under the condition of 1.5g/L zeolite input,the highest removal rate of Cu²⁺in solution,reaching 97.63%.The adsorption amount of faujasite to CO₂ was 17.965 m²/g,and when the initial Cu²⁺concentration was 60 mg/L,the adsorption time was 3 hours.Under the condition of 1g/l zeolite input,the removal rate of Cu²⁺in the solution is the highest,the highest removal rate of Cu²⁺in solution,reaching 98.38%;the adsorption amount of CO₂ by the calcinite is 32.520 m²/g,and when the initial Cu²⁺concentration is 60 mg/L and the adsorption time is 3 hours,Under the condition of 1.5g/L zeolite input,the removal rate of Cu²⁺in the solution is the highest,the highest removal rate of Cu²⁺in solution,reaching98.90%.In this paper,a series of molecular sieves were prepared from deep-sea clay and explored its application in the field of adsorption,which expanded the application field of deep-sea clay and provided a direction for the future development of ocean resources.