Page 10 - tech fest 2025 ב״ש חוברת תקצירים

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An Attempt to Prevent the Growth of Algae in Freshwater Using an Effective Concentration of Copper(I) Ions
ChE-A-01
Oriya Amroussi; oriyaam22@gmail.com
Advisors: Dr. Oshra Ilan Saphier1, Dr. Magal Saphier2 1SCE - Shamoon College of Engineering, Be’er-Sheva 2Coppter Ltd.
Copper(I) ions possess antibacterial properties and are commonly used to disinfect and eliminate bacteria and fungi. This study investigates the use of copper(I) ions to prevent algal growth in fresh water. Algae, particularly the green species, are a common problem in swimming pools. The goal of this research was to examine the effect of copper(I) ions on algal growth prevention, considering parameters such as light/darkness, pH, hydrogen peroxide and algaecide use. The algae were grown in a tank simulating a pool and their effects were measured by means of pH measurements, visual observation and agar plates. The results were inconclusive, indicating the need for further investigation into copper(I) ions' effects on algae growth.
Keywords: copper(I) ions, disinfection, freshwater, green algae
Development of an Electrochemical Sensor Based on the D-Penicillamine Ligand Using Dip- Pen Nanolithography (DPN) for Copper Detection
ChE-A-02
Maria Izotov; maria7717@gmail.com
Advisors: Prof. Ariela Burg1, Ms. Ron Peretz1 1SCE - Shamoon College of Engineering, Be’er-Sheva
Many water sources are contaminated with heavy metals that can cause severe health risks. To address this problem, treatment methods require accurate metal detection. Electrochemical sensors efficiently detect low metal concentrations but struggle with simultaneous multi-metal detection. This fact led to the development of a DPN-based electrochemical sensor, forming uniform nanostructures with a high surface-to-volume ratio to enhance sensitivity. The patterning process uses ink containing PDMS, n-hexane, and the D-penicillamine (D-PA) ligand for the binding of metal ions, enabling their precise detection. The results indicate that the optimal pH is 5.0 and that ligand amounts above 3.8 mg do not affect the sensor's sensitivity. This sensor achieves a low detection limit (LoD) of 0.125 ppb, demonstrating high sensitivity.
Keywords: copper detection, DPN, electrochemical sensors, nanostructures, working electrodes