水热法合成超细斜发沸石试验研究OA

Clinoptilolite has strong adsorption and ion exchange capabilities,and is widely used in heavy metal and oil wastewater removal,sugar production,paper purification,preparation of anti-bacterial and anti-cancer drug additives,petrochemical catalytic cracking,national defense and CO2 removal.In order to obtain high-purity clinoptilolite,the clinoptilolite was prepared by hydrothermal method with NaOH,KOH,Al(OH)3,Na2 O·n SiO2 and H2 O as raw materials.The synthesis conditions of clinoptilolite were studied by XRD and crystal surface analysis.The results show that the optimum conditions for synthesis of clinoptilolite are n(SiO2)/n(Al2 O3)=11,n(OH-)/n(SiO2)= 0.55,n(H2O)/n(SiO2)=25～55,temperature 150℃,time 6 d.The synthesized clinoptilolite exhibited a sheet-like structure,complete characteristic peak and high purity.Its crystal cell composition is Na0.36 K6.58[(AlO2)6-(SiO2)25.26]·6.71 H2 O,n(SiO2)/n(Al2 O3)about 8.5,which belongs to the middle Si-Al ratio zeolite.The SEM analysis results show that the particle size is below 1.3 μm,indicating that the particle size is very fine.Its static water adsorption capacity is 34.3%,which meets the first-class requirements in HG/T 2690-2012"13X Molecular Sieve".The research results can provide reference for the precise synthesis of high-purity fine clinoptilolite.