摘要
以钛酸丁酯和硅酸乙酯为主要原料,制备多孔纳米TiO2/SiO2复合材料,并对其进行了电镜扫描、红外光谱、氮吸附-脱附等表征.在pH=7.5、流速为1.2mL/min的条件下,试液中的痕量镉可被纳米TiO2/SiO2复合材料定量吸附,其动态饱和吸附容量为30.0mg/g,吸附在复合材料上的镉可用1.0mol/L HCl洗脱,洗脱液中的镉用火焰原子吸收法测定.该方法的检出限为15.2μg/L,线性范围为0.05～2.5mg/L,相对标准偏差为2.6%,加标回收率在96.0%～106.5%之间.方法应用于环境水样中痕量镉的测定.
Nano TiO2/SiO2 composite as a new sorbent was synthesized with tetrabutyl titanate and ethyl silicate and characterized using scanning electron microscope （SEM）, infrared spectrum （ IR） and Nitrogen adsorption and desorption. At pH 7.5 and flow rate 1.2 mL/min, the cadmium in solution could be quanti- tatively adsorbed by nano TiO2/SiO2 composite and dynamic adsorption capacity was 30. 0 mg/g. The ad- sorbed cadmium could be eluted with 1.0 mol/L HCl and the Cd2＋ in eluant was determined by flame atomic absorption spectrometry. The detection limit was 15.2 μg/L, the relative standard deviation （RSD） was 2.6% and the calibration curve was linear over Cd2＋ concentration in the range of 0.05-2.5 mg/L. The spiked recoveries ranged from 96.0% to 106.5%. The method was applied for determination of trace cad- mium in environmental water samples with satisfactory results.
出处
《湘潭大学自然科学学报》
CAS
CSCD
北大核心
2012年第4期67-71,88,共6页
Natural Science Journal of Xiangtan University
关键词
纳米TIO2
SIO2
复合材料
分离富集
火焰原子吸收法
环境水
镉
nano TiO2/SiO2 composite
separation and preconcentration
flame atomic absorption spec-trometry
environmental water
cadmium
