TiO_(2)/沸石复合材料的吸附-光催化体系对氨氮的去除研究

Study on adsorption and photocatalysis integration system by Ti-Z composite for the removal of ammonia nitrogen from aqueous solution

通过溶胶-凝胶法原位制备TiO_(2)/沸石的复合材料(Ti-Z),构建针对水中氨氮去除的吸附-光催化一体化体系。复合材料Ti-Z能够协同发挥沸石对氨氮的选择性吸附和TiO_(2)的光催化特性。结果表明:在碱性条件下(pH=9.8)反应60min后,Ti-Z对50mg/L氨氮溶液的去除可达18.6mg/g,高于纯沸石的吸附去除量(17.7mg/g)。碱性环境有利于TiO_(2)/沸石去除水中的氨氮,较弱酸环境中(14.4mg/g),体系的氨氮去除量有明显提高;光照时,曝气混合对体系中氨氮的去除提高不明显,不具有经济效益。

TiO_(2)/zeolite composite(Ti-Z)was prepared by sol-gel method and applied in integrated adsorptionphotocatalysis system for ammonia nitrogen removal from aqueous solutions.The results indicated that Ti-Z could synergistically remove ammonia nitrogen by zeolite adsorption and TiO_(2) photocatalytic reaction.Under alkaline condition(pH=9.8),the removal capacity of ammonia nitrogen(50mg/L)on Ti-Z was 18.6mg/g,which was higher than that by simple zeolite adsorption(17.7mg/g).Alkaline environment was helpful for the treatment of ammonia nitrogen by Ti-Z composite,and it was more favorable and higher removal capacity than that in weak acid environment(14.4mg/g).Aeration had insignificant improvement on ammonia nitrogen removal in this system,and was not suggested in consideration of economy.