摘要
采用柠檬酸络合,溶胶-凝胶法制备了硅胶G负载纳米钛酸锶钡,并对其结构和对水中锌离子的吸附性能进行了研究。结果表明：溶胶-凝胶法制备的纳米钛酸锶钡能够牢固地负载于硅胶G表面,成为蚕茧状颗粒吸附材料。在pH 4~7时,该吸附剂对水中的锌离子具有很强的吸附能力,静态吸附容量达21 mg/g,吸附在吸附剂上的锌离子,用0.5 mol/L的硝酸可完全洗脱,采用火焰原子吸收光谱法测定。方法检出限为4.2μg/L,对初始浓度0.01 mg/L Zn2＋的溶液,独立吸附测定6次,相对标准偏差为3.1%。将其用于水中痕量锌的富集测定,回收率为94.2%~103.0%。
The silica gel G loaded nano-barium strontium titanate was prepared by citric acid complex sol-gel method,and then its structure and adsorption capability to Zn （Ⅱ） in water were investigated. The results showed that the nano-barium strontium titanate prepared sol-gel method could be steadily loaded on the surface of silica gel G to produce a cocoon particle adsorption material. This adsorbent had strong absorption capacity to Zn （Ⅱ） in water at pH 4-7, and the static absorption capacity was up to 21 mg/g. Zn （Ⅱ） adsorbed to the adsorbent could be totally eluted by 0.5 mol/L nitric acid, and then determined by flame atomic absorption spectrometry. The detection limit of this method was 4.2μg/L. The RSD was 3.1% for six independent adsorptions and determinations of Zn （Ⅱ） with initial concentration of 0.01 mg/L. The method has been applied to the enrichment and determination of trace Zn （Ⅱ） in water with the recovery of 94.2%-103.0%.
出处
《冶金分析》
CAS
CSCD
北大核心
2008年第9期38-42,共5页
Metallurgical Analysis
基金
辽宁省自然科学基金(81664)
关键词
纳米钛酸锶钡
硅胶G
吸附富集
锌
火焰原子吸收光谱法
nano-barium strontium titanate
silica gel G
adsorption and enrichment
zinc
flame atomic absorption spectrometry
