Abstract
p-Nitrophenol (p-NP) is a nitroaromatic compound that causes a serious threat to humans and the environment due to its carcinogenic, mutagenic, cyto, and embryonic toxicity even at low concentration. Thus, selective and sensitive detection of p-NP is highly desirable for human health and environmental monitoring. The effectiveness of (3-Aminopropyl) triethoxysilane (APTES) coated zinc oxide (ZnO) (APTES@ZnO) quantum dots (QDs) as a fluorescent material was studied for detection of p-NP under various reaction conditions. The concentration of p-NP can sense by the depth of APTES@ZnO QDs fluorescence quenching. Under the optimum reaction conditions, a linear relationship was observed between a relative fluorescence quenching intensity of APTES@ZnO QDs and concentration of the p-NP over the range of 1.0–80 μM. The lower detection limit of APTES@ZnO towards p-NP is 0.089 μM, which is below the allowable drinking water standard as per US-EPA. Thus, a sensitive and selective fluorescence-based method is developed to detect p-NP on account of the partially inner filter effect (IFE) and electron transfer process.
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