Recyclable Magnetic Mesoporous Nanocomposite with Improved Sensing Performance toward Nitrite

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• 作者：Yihe Zhang ; Zisheng Su ; Bin Li ; Liming Zhang ; Di Fan ; Heping Ma
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：May 18, 2016
• 年：2016
• 卷：8
• 期：19
• 页码：12344-12351
• 全文大小：532K
• 年卷期：0
• ISSN：1944-8252

文摘

A magnetic nanomaterial for nitrite ion detection was demonstrated in the present study. This nanomaterial was prepared by grafting a rhodamine 6G derivative (denoted as Rh 6G—OH) into the channels of core–shell magnetic mesoporous silica nanospheres. The nanocomposite (denoted as Fe₃O₄@Rh 6G) showed large surface area and improved fluorescent performance to accumulate and recognize NO₂^–, and its superparamagnetic behavior played an important role in reusability. The fluorescent intensity decreased linearly along with the NO₂^– concentration in the range of 1–50 μM, and the detection limit was estimated to be 0.8 μM, which was much lower than the maximum limit of nitrite ion in drinking water (65 μM) recommended by World Health Organization. Importantly, Fe₃O₄@Rh 6G could be magnetically collected and effectively reutilized after six test cycles.