Spectrophotometric determination of trace p-nitrophenol enriched by 1-hydroxy-2-naphthoic acid-modified nanometer TiO2 in water
Spectrophotometric determination of trace p-nitrophenol enriched by 1-hydroxy-2-naphthoic acid-modified nanometer TiO2 in water
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DOI：
10.1039/c3ay41467a
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发表时间：
2013-10
影响因子：
3.1
通讯作者：
Xiaofeng Lin;Yi-ping Chen;Shunxing Li
中科院分区：
文献类型：
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作者：
Xiaofeng Lin;Yi-ping Chen;Shunxing Li
采用1-羟基-2-萘酸（HNA）对纳米TiO2表面进行了简单、快速的化学吸附修饰，增强了TiO2与对硝基苯酚（p-NP）的亲和力。本文提出了一种用修饰的纳米TiO2 （HNA-TiO2）预富集p-NP并通过分光光度法测定的新方法。在最佳吸附条件下，在pH 0.3条件下搅拌15 min，对p-NP的最佳吸附率大于98.0%，且na - tio2对p-NP的吸附量大于25.0 μ mg−1。吸附的p-NP用5 mL 2.0 mol L−1 NaOH可洗脱，洗脱率大于92.0%。该方法对250 mL样品的富集系数为50，检出限（3σ, n = 11）降至25.4 μ L−1，相对标准偏差为3.10%。该方法简便、快速，成功地应用于工业废水和自然水体中p-NP的测定，避免了基质和类似有机污染物（苯甲酸酯和苯酚）的干扰。样品中添加的p-NP的分析回收率为93.5% ~ 104.1%。
The surface of nanometer TiO2 was simply and quickly modified by chemical adsorption with 1-hydroxy-2-naphthoic acid (HNA), which can strengthen the affinity between TiO2 and p-nitrophenol (p-NP). A novel method for preconcentration of p-NP with HNA-modified nanometer TiO2 (HNA–TiO2) and determination by spectrophotometry has been developed. Under the optimum adsorption conditions, the best adsorption ratio of p-NP was greater than 98.0% at pH 0.3 after only stirring for 15 min, and the adsorptive capacity of HNA–TiO2 for p-NP was greater than 25.0 μg mg−1. The adsorbed p-NP could be eluted by 5 mL 2.0 mol L−1 NaOH and the elution percentage was greater than 92.0%. This method gave a concentration enrichment factor of 50 for a 250 mL sample, the detection limit (3σ, n = 11) was reduced to 25.4 μg L−1, the relative standard deviation was 3.10%. This simple and fast method was successfully applied to the determination of p-NP in industrial wastewaters and natural waters, so the interference from the matrix and similar organic pollutants (benzoate and phenol) could be avoided. Analytical recoveries of p-NP added to samples ranged from 93.5% to 104.1%.