2018英特爾ISEF學科最佳作品摘要：環境工程 Best of Category Abstract: ENVIRONMENTAL ENGINEERING

Category: STEM國際競賽, 國際競賽, 物理國際競賽 Date: 2019年9月2日上午11:05

獲獎作品基本信息

年份	2018
學科	環境工程 ENVIRONMENTAL ENGINEERING
學校	Greenwich High School
國家/州	CT, United States of America

獲獎作品名稱

Magnetically Induced, Visual Detection of Trace Arsenic Contaminants in Water Using Fe3O4 Photonic Crystal Structures

獲獎作品摘要

Arsenic, a highly toxic metal contaminant commonly found in our drinking water, is responsible for many accidental deaths. Currently, the only visual arsenic-in-water detection system is tedious, and can detect arsenic concentrations of 250ppb or more, well above the EPA 10ppb water-action-level. To combat arsenic drinking water contamination, a sensitive, inexpensive, portable, and easily-visualized detection system is needed and has been developed in this research. To begin, superparamagnetic, SiO2-coated, polyacrylic acid-capped Fe3O4 colloidal nanocrystals (CNC’s) were synthesized, and their photonic and physical properties characterized via SEM and UV-Visible spectroscopy. Application of 80-140G magnetic field from a portable, 3” magnet altered the refractive indices of the photonic structures, so that long-to-short wavelength, red-to-blue color change is easily visualized from the native brown CNC solution color. Addition of 1ml of 10ppb Arsenic, however, to 2ml of 8mg/ml CNCs causes alteration of the photonic characteristics so that long-wavelength shift occurs with an applied magnetic field (native brown to orange). This new color changing behavior is specific to the arsenic contaminant, and attributed to As-O interactions at the surface of the SiO2-coated CNCs. Other typical metal contaminants did not share this same metal-oxide CNC-coating affinity. For the consumer-friendly, rapid Arsenic-in-water assay, a color code was developed to detect/indicate as little as 10ppb As-contaminant, with a color change at 10ppb increments. In the field, drops of suspect water are added to the CNC solution at 1:2 (v/v) in a small vial; Arsenic contamination is determined in seconds via color change through the application of a small magnet.

高中生科研英特爾 Intel ISEF
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高中生科研學術活動英特爾 Intel ISEF 簡介

英特爾國際科學與工程大獎賽，簡稱 "ISEF"，由美國 Society for Science and the Public（科學和公共服務協會）主辦，英特爾公司冠名贊助，是全球規模最大、等級最高的中學生的科研科創賽事。ISEF 的學術活動學科包括了所有數學、自然科學、工程的全部領域和部分社會科學。ISEF 素有全球青少年科學學術活動的“世界杯”之美譽，旨在鼓勵學生團隊協作，開拓創新，長期專一深入地研究自己感興趣的課題。

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英特爾 ISEF 學術活動詳細介紹

英特爾 ISEF 全程指導方案

· 數學 · 物理 · 化學 · 生物 · 計算機 · 工程 ·

學科簡介：環境工程 ENVIRONMENTAL ENGINEERING

Studies that engineer or develop processes and infrastructure to solve environmental problems in the supply of water, the disposal of waste, or the control of pollution.

Subcategories:

Bioremediation?(BIR):?The use of biological agents, such as bacteria or plants, to remove or neutralize contaminants. This includes phytoremediation, constructed wetlands for wastewater treatment, biodegradation, etc.

Land Reclamation?(ENG):?Studies that apply? engineering principles and design techniques to restore land from wetlands, seas, lakes, deserts or mines, through drainage or irrigation to a more productive use or its previous undisturbed state.? This subcategory also includes studies involving the restoration of land that is damaged by natural phenomena, such as erosion, or impaired by industrial and urban processes.

Pollution Control?(PLL):?Studies that use engineering principles and design to prevent or control air, water and solid waste pollution.

Recycling and Waste Management?(REC):?Studies involving the extraction and reuse of useful substances from discarded items, garbage, or waste. The process of managing, and disposing of, wastes and hazardous substances through methodologies such as landfills, sewage treatment, composting, waste reduction, etc.

Water Resources Management?(WAT):?Studies that apply engineering principles and design to the planning, developing, distributing and managing the optimum use of water resources.?Studies in this subcategory might include applied surface and groundwater hydrology, forecasting and control of quantity and quality of water or simulation and modeling of water resource systems.

Other?(OTH):?Studies that cannot be assigned to one of the above subcategories. If the project involves multiple subcategories, the principal subcategory should be chosen instead of Other.

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