摘要
通过水热法合成了水合结晶硅钛酸钠(Na-CST)和25%铌取代水合结晶硅钛酸钠(Na-Nb/CST),利用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、BET氮气吸附法对其进行了表征,并用这两种材料对铅开展了吸附实验.结果显示,在pH值为4.00~6.50时两种材料有良好的吸附效果,吸附过程在60min内达到平衡,饱和吸附容量分别为70.1mg·g^-1和70.7mg·g^-1.两种吸附剂均表现出良好的水体除铅性能,在质量浓度为10^-9kg·L^-1量级的铅溶液中对铅的去除率可以达到94%以上,吸附后水中铅残留量降至3×10^-9kg·L^-1以下,符合世界卫生组织规定的饮用水铅含量标准.
Sodium crystalline silicotitanate (Na-CST) and niobium substituted crystalline silicotitanate (Na-Nb/CST),which were synthesized using the hydrothermal method and characterized by X-ray diffraction (XRD),BET and scanning electron microscopy (SEM),were used to separate Pb^2+ from aqueous solutions.The adsorption experiments show that their maximum adsorption ability is within pH 4.00 ~ 6.50.The adsorption process reaches equilibrium within 60 min,and the maximum adsorption quantity of Na-CST and Na-Nb/CST is 70.1 and 70.7 mg·g^-1,respectively.Both materials are able to remove more than 94% of Pb^2+ from water when Pb^2+ concentration is at 10^-9 kg·L ^-1 level.Most interestingly,the concentration of Pb^2+ could be lower than 3×10^-9 kg·L^-1 after adsorption,much lower than the standard set by of the World Health Organization for the quality of drinking water,1×10^-8 kg·L^-1.
作者
赵旭东
翁汉钦
盛六四
於国兵
林铭章
ZHAO Xudong;WENG Hanqin;SHENG Liusi;YU Guobing;LIN Mingzhang(School of Nuclear Science and Technology,University of Science and Technology of China,Hefei 230026,China;National Synchrotron Radiation Laboratory,University of Science and Technology of China,Hefei 230029,China;Environmental Radiation Surveillance Center,Environmental Protection Department of Anhui,Hefei 230071,China;Institute of Nuclear Energy Safety Technology,Chinese Academy of Sciences,Hefei 230031,China)
基金
国家自然科学基金(11775214)
中国博士后科学基金(2016M592069)
安徽省自然科学基金(1708085QA21)
中央高校基本科研基金(WK2140000009)资助
