Methods to identify photocatalyst products containing nano-titanium dioxide components

There are many air treatment products on the market, sold under the banner of "photocatalyst", and the actual products do not contain nano titanium dioxide photocatalyst components. So how to quickly and easily identify whether such products contain photocatalytic substances? Ningbo Very micro Nano Technology Co., Ltd. summarizes the following identification methods for your customers and peers to refer to:

Method 1: Look at the state of the product solution. If the product completely presents a solution state, that is, a true solution state, without dispersed suspended particles or colloidal particles, then it can be determined that there are no photocatalytic components in such products. Because the photocatalyst components represented by nano titanium dioxide are insoluble in water, they can only exist in the form of particulate matter in water and cannot be dissolved to form a true solution state.

Method 2: Look at the color of the product dispersion. Usually high-quality photocatalysts are light blue colloidal dispersions; The slightly inferior photocatalyst is a milky white state, and will produce sediment after a period of time. If the solution is colorless and transparent, it can be confirmed that there are no photocatalytic components.

Method 3: Add a little salt or a lot of tap water. You can add a small amount of salt or a large amount of tap water to the solution and shake well. If the state of the solution does not change, there is no photocatalyst component. Because the photocatalytic particles dispersed in water encounter a large number of ions, they will agglomerate to form a precipitate.

Method 4: Adding medical hydrogen peroxide for identification. Add medical hydrogen peroxide to the photocatalyst solution. If the solution has no color change, it can be determined that there is no photocatalyst component in the product; If the solution produces a light yellow color, it can be determined to contain photocatalyst components. This is mainly because hydrogen peroxide combines with nano-titanium dioxide to form a light yellow "titanium-peroxy" complex.

Method 5: Photocatalytic activity test. This method is slow and unintuitive. The main comparison method is as follows: firstly, add colored dye to the solution, then divide into two parts and add photocatalyst, and carry out dye fading test under no light and light condition. Generally speaking, if the color of the dye is unchanged under no light, the dye can fade under light, basically indicating that the active ingredient is a photocatalyst; If the solution can fade under both no light and light conditions, it indicates that the active ingredient is not a photocatalyst, the reaction is not a photocatalytic reaction, and it cannot be effective for a long time.