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International Conference on Chemical Innovation (ICCI 2021) IOP Publishing Journal of Physics: Conference Series 2266 (2022) 012004 doi:10.1088/1742-6596/2266/1/012004 CoV-2 [4,19, 22], and various HOCl-based products that meet the EPA standards for use against SARS- CoV-2 have been produced. As a result, 10 g of NaCl can be determined as a sufficient amount to produce HOCl as a safe sanitizer in as little as 12 minutes, while 30 g of NaCl can be determined as a suitable amount to make HOCl as a safe disinfectant in as little as 12 minutes. Throughout the electrolysis process, the pH of the HOCl solution was slightly acidic in the range of 4 to 7, shifting the balance toward the more effective antibacterial HOCl [23]. 3.2 The effect of electrode type on HOCl production during electrolysis The effect of electrode type on HOCl production experiment was done on 10 and 30 grams of NaCl because it produced HOCl within the range of sanitizer and disinfectant concentrations. In sodium chloride solution electrolysis, the carbon electrode can produce HOCl. Carbon electrodes are used in electrolysis because of their ability to transmit electricity efficiently, their high melting point, and the large number of free electrons available for transfer, which can be used to facilitate various reactions. The carbon electrode, on the other side, gradually disintegrates in the solution, becoming thinner and eventually breaking into two pieces. Figure 3 shows how the solution becomes cloudy with carbon residue at the bottom of the electrolysis cell. Although the carbon electrode was able to produce HOCl, the disintegration issue must be addressed in the long run. In HOCl electrolysis, the effect of using a titanium coated electrode was also tested. The electrolyte solution turns yellow during electrolysis, as illustrated in Figure 3, and no HOCl was formed when tested with an active chlorine test strip. Because the electrodes were dissolved in the electrolyte solution, the pH increased to 12, which was extremely alkaline. Because 100% pure titanium coated electrodes are extremely expensive, it was suspected that the titanium coated electrodes used were not pure enough. As a result, titanium coated electrodes were not recommended because the aim was to construct an electrolyzer at a low cost so that anyone could own one for personal use. Graphite electrodes have been shown to produce clear HOCl solutions, are free of contaminants, and can produce the same concentration of HOCl as carbon electrodes. Due to its inexpensive cost, strong electrical and thermal conductivity, relatively inert behaviour in alkaline solution compared to metals, and porous structure with high purity, graphite is a good choice in water electrolysis compared to many other electrodes [21]. However, after a longer period of time, the pH of the solution increased to an alkali level, which is unfavorable for HOCl electrolysis. 1 mL of vinegar, a safe organic acid, was added to the solution to lower the pH to 5 to 7. The use of vinegar in a diluted salt solution to develop on-site EW at a dentist office using a portable EW generator unit was detailed in a recent study [1]. As a result, graphite was chosen as the best electrode because it produced a clear HOCl solution throughout the electrolysis process, as shown in Figure 3, and vinegar could be used as a safe and inexpensive raw material to lower the alkalic pH of the solution to pH 5–7, ensuring the presence of HOCl as an electrolysis product. Figure 3. Visual observation comparison between carbon, titanium and graphite electrode 6PDF Image | Electrolysis Study Effect on Electrolyzed Water
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